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   Be a guest at the 22. European Jazztival at Schloss Elmau / Southern Germany

   and audition LXspeakers in the Foyer of the Konzertsaal. 

   Thereafter, enjoy the presentations of :

   Michael Wollny, Nils Landgren, Joel Lyssarides, Tord Gustavsen, RYMDEN,

   Mathias Eick, Cæcilie Norby, Lars Danielsson, Johanna Summer... 

   You may pre-register via email for audition on Nov.18th,19th,20th or 21th in the Konzertsaal Foyer.



HDF*) Bausätze für LXsub4 (verwendet bei LX521 und bei LXstudio) sind in Produktion und können demnächst ausgeliefert werden.


*) HDF is a modern high density wooden material, that avoids the downsides of MDF (soaking edges, etc). HDF in dark anthracite:

It is an extremely robust high density, black coloured wood fibreboard (>1,000 kg/m³).

Its high strength across the complete board cross section facilitates three-dimensional processing without any risk of fraying. It is a natural material made of wood which defibres gently and is manufactured according to ecological principles.


HDF can be used as extremely compact, robust support board. Thanks to its black colouring and the compact product structure, the board can also be used as an attractive surface without additional coating. 

HDF is ideally suited for applications requiring ecologically sustainable material due to its environmentally compatible manufacturing.



Liebe Linkwitz Freunde,

Am kommenden Samstag gibt es wieder eine Gelegenheit

Linkwitz LX Lautsprecher in Deutschland zu hören.

Samstag 25.07.2020  nahe Stuttgart Flughafen.

Unter Pandemieregeln max. 2 Personen pro Termin.

Reservieren Sie Ihre Plätze unter info@magicLX521.com


08 JULI 2020

Bausätze und fertig gebaute Systeme: Luftfracht Sendungen nach USA/Kanada benötigen mit unserem neuen Kurier Service jetzt nur noch 3-6 Tage 


25 JUNI 2020

Wir haben Anfragen zu den kommenden Linkwitz loudspeakers OpenHouses in Stuttgart and San Francisco erhalten. Genaue Termine folgen. Limitierte Teilnehmerzahl.

Sie können sich vorab via email auf die Interessentenliste eintragen : info@magicLX.com



Mehr entdecken auf www.LINKWITZ.com



Liebe Linkwitz Freunde,

die dreidimensionale Bühne, bzw. Bühnen-Illusion, der Linkwitz Lautsprecher lässt sich zwar beschreiben, man realisiert es aber erst beim persönlichen Hörerlebnis.

In zwei Wochen gibt es wieder eine Gelegenheit

Linkwitz LX Lautsprecher in Deutschland zu hören.

Samstag 21.12.2019 11.00-13.00  nahe Stuttgart Flughafen.


Reservieren Sie Ihre Plätze unter info@magicLX521.com




Schloß Elmau is a unique place in the Alps.
Music lovers as well as performing musicians took the opportunity to listen to LXsirius+2.

The room for the audition was ca 7m x 8m and rather reflective.

Nevertheless, without any room treatment or DSP-"room correction" at work,
the presentation and and phantom stage were found to be exceptional.

Michael Wollny Trio LXsirius+2  DEMO2



Due to MarinCounty fires and power outage , the October OpenHpouse had to be postponed to November 9th.
Again fully booked. This time , LX521.4 in American Walnut finish and Berylllium Tweeter upgrade were at display.

We had LXsirius in dark anthracite color as well as in dull white color .
Furthermore, the round LXsub2 cabinets in dark anthracite color were displayed (new black SEAS XM4 drivers not yet inserted)

All systems were driven from a laptop PC via AFI/USB-reclocker to a PowerBox 6pro NCore

_MG_0002a _MG_0032

_MG_0090 _MG_0094

_MG_0103 _MG_0043L




Schloss Elmau ist ein einzigartiges Hotel um Natur und erstklassigen Kulturgenuß zu verbinden.


"Mention Schloss Elmau to any famous tenor, pianist or violinist, and they talk of a place that’s ‘idyllic’, ‘blissful’, even ‘magical’. No matter where you turn, you feel as if you’re being taken to a better place. Hearing chamber music performed live, with a view of the sun setting over the mountains, is a life-enhancing experience – especially when the musicians are among the most critically acclaimed in their field."
Sam Jackson, Managing editor von Classic FM & Smooth Radio, UK


Die Financial Times "how to spend it" schreibt über Schloss Elmau.

Jazztival Gäste könnensich an LXsirius`Phantombühne vor beeindruckender, alpiner Kulisse erfreuen.
Private Hörtermine nach Vereinbarung: info@magicLX.com



OpenHouse in Stuttgart. Musikfreunde konnten die natürliche und holografische Darstellung der Linkwitz Lautsprecher genießen.
Recht häufig finden Besitzer von Flächenstralern den Weg zu uns. Wie sie berichten, gefällt ihnen der Zugewinn an Dynamik und die weite "Sweet Area" statt "Sweet Spot".



LINN Streamer-PowerBox6 pro NCore-LX521.4 (mit Beryllium Tweeter upgrade)

JRiverID-AFI/USB-OPPO HA1-PowerBox 6pro NCore precision analog - LXsirius undLXsirius+2




Wo findet man Tips von wahren Musikliebhabern?

In der Schatzkammer des EINKLANG Stuttgart!

Der Chefdirigent des SWR Symphonieorchesters Teodor Currentzis im EINKLANG .

Wir freuen uns, dass ein Paar LXsirius in diesem Musikparadies holographisch aufspielen dürfen.

EINKLANG veranstaltet regelmäßig Extra-Abende, um nach offiziellem Ladenschluss viel mehr über Musiker und ihr Werk zu erfahren,
oder um einfach gute Musik zu genießen.





Alpines Panorama und LXsirius genießen....

Enjoy LXsiriusEnjoy the View and LXsiriusIMG_7250s



Die neuen Subwoofer Chassis SEAS XM004-04S sind im Juli hier eingetroffen.

Sie ersetzen die L 26. Änderungen sind weder and Gehäusen noch an Frequenzweichen nötig

Wir haben sowohl die Standard Version mit naturfarbenem Alukonus vorrätig,

als auch die Sonder Edition mit schwarzem Alukonus






Eike Linkwitz invited to the 3rd OpenHouse this year.
Again, fully booked.
Some music lovers traveled several hours across the country to experienc Siegfried Linkwitz´ creations.


As the source of phantom images could not be determined easily, a lot of questions came up about what model would be playing right now...?.?.?


We played LXsirius, LXsirius+2 and LX521.4.  All fed by a Tablet PC > AFI-USB Reclocker >PowerBox 6pro NCore > LXspeakers

As you can see, Eike Linkwitz provided a fantastic catering.

Classical music, live Jazz, choir music, male and female voices, organ music, bigband, rock and pop.


Range of different volume levels was covered:
Decent "Pavane" recordings from San Francisco Symphony to Rolling Stones with turned up volume.

Inbetween, the audicence could get insights in the construction/design principles of LXspeakers and
learned to understand why they are so different from convential "box" speakers.

You may pre-register for the next OpenHouse (probably October 2019)
by email to info@magicLX.com 

So, you´ll be noticed about details as soon as they become available.




LX loudspeaker audition - Open House in Corte Madera - Saturday, July 27, 2019 --- 10 am to 2:30 pm.

Due to two fully booked events this year, Eike Linkwitz once more likes to invite you to an unique LX loudspeaker demonstration at the home of linkwitzlab in Corte Madera.

Enjoy the realistic music presentation of LXsirius, LXsirius+2 , LX studio or LX521.4.

Frank Brenner will be availabe for Q&As. 


Send  an email  for number of place reservations at either 10:00 am, 11:30 am or 1:00 pm and for driving directions. Please state, if you are interested in listening to a specific model of LX speakers  (LXmini, LXsirius, LXsirius+2 , LX studio or LX521.4)



As this years first Open House was fully booked, Eike Linkwitz fortunately decided to invite to these gatherings regularly.         

The next Open House in Corte Madera is scheduled for April 27th, 2019 10.00 a.m. to 4.00p.m.

Eike Linkwitz invites you to an unique LX loudspeaker demonstration at the home of linkwitzlab in Corte Madera. 
        Enjoy the realistic presentation of LXmini, LXsirius, LXsirius+2 , LX studio or LX521.4.

        Frank Brenner will be availabe for Q&As. 

        Compared to the LXsirius+2 driven from a single PowerBox the LX521.4 has obviously higher output capability at all frequencies and/or         
        lower  distortion. But in all other respects the music and acoustic scene experiences are remarkably similar. The LX521.4 gives a convincing 
        sound illusion regardless of the type of music played and yet the speakers are revealing of every subtle detail in the recording to a mix 
     and mastering engineer. 

        Send  an email  for number of place reservations at either 10:00 am, 11:30 am, 1:00 pm, or 2:30 pm and for driving directions. 
        Please state , if you are  interested in listening to a specific model of LX speakers  (LXmini, LXmini+2 , LX studio or LX521.4)

        See you then, Eike Linkwitz 
        & Frank Brenner.

        Repeating guests are welcome !



Neu im Webshop: Präzisions-Frequenzweiche für LX521.4  hier




The first Open House Event in 2019 took place in Corte Madera, California



Linkwitz LX speaker enthousiasts and music lovers come together all over the world.

In Singapore it is always a pleasure to meet an active circle at Stevens superb place
to listen / compare / discuss and get some delicious hand-made food. Thank you!

This time, we enjoyed LXmini+2 and LXmini, fed by PowerBox 6pro NCore (DSP based)
and alternatively by
PowerBox 6pro NCore "precision analogue" (ASP based) with
some jazz and some classical music from Stevens large and well sorted collection.





Musikliebhaber konnten sich beim 20.Jazztival im SCHLOSS ELMAU vom natürlich Klang und der faszinierenden 3D Phantombühne der magicLX Lautsprecher überzeugen.

Live Konzerte und  Linkwitz LX Präsentation vor einer beeindruckenden Alpenkulisse




Update on 3-way balanced ASP Nelson Pass for LXmini /LXmini+2 / LXstudio.

Nelson Pass continued optimizing its ASP circuit:
"These boards have better distortion and higher maximum output than previous".
Nelson Pass implemented these changes in the fully assembled pcbs, which will be shipping this week.
Pcbs in the DIY sets need to be revised,  so that there will not be confusion on assembly,
as some labeling has been changed on parts and several connections have to be made by hand.
These new DIY pcbs are on order and need some more time to arrive here.




Das diesjährige JazzEsslingen steht im Zeichen des Plattenlabels ECM. Auch ECM-Chef Manfred Eicher war unter den Gästen des Eleni Karaindrou Konzertes.

Der Empfang vor dem Konzert fand in der Bel-Etage der Kessler Villa statt.


Wir konnten eine minimalistische, aber dennoch raumfüllende LXmini Vorführung bieten (Tablet > PowerBox > LXmini). 

Interessierte Musikliebhaber fragten, wie denn diese Musikbühne entsteht, wenn man doch gar keine "Boxen" sieht.

Wetten, daß Siegfried Linkwitz (1935-2018) dies "von oben" mit einem Grinsen beobachtet hat ?



Neue LXMINI Treiber Sets mit Woofer Konus alufarben und als Sonderserie mit schwarzem Woofer-Konus. Details

LXMINIdrv special edition black



Burning Amp Festival in San Francisco / Ft Mason.

BAF2018Siegfried This years Burning Amp took place without the mastermind, genius and good friend!

Glad, that his wife Eike agreed to attend the show.

Thanks to Mario and all the helping hands, that made BAF2018 possible!

Many visitors took the opportunity to listen to the LXmini+2 system. It was displayed in two different crossover/amplifier configurations, by plugging between



It was a pleasure meeting you at Burning Amp

More details on the display in the linkwitzlab room: Tablet PC -> AFI USB Reclocker -> Oppo HA-1 DAC, then either

  1. PowerBox Ncore (ASP insidde) -----------------------> LXmini+LXsub2 or
  2. Nelson Pass 3-way balanced ASP -> 6x MOD686 -> LXmini+LXsub2

PowerBox Ncore (ASPinside) was configured as demo unit, fitted with a switch to instantly change between LXmini and LXmini+2 configuration (change in mid-woofer eq and sub-switching).

_DSF4849s _DSF4745s_DSF4619s


Photo credits Eike Linkwitz and D.Rogers



Siegfried Linkwitz (1935-2018)

Ein warmherziger Freigeist, Pionier, Erfinder und Freund ist von uns gegangen.....   




Let´s meet 30SEP2018 at the Burning Amp Festival in San Francisco / Ft Mason.



Be among the first to Listen to our new balanced, JFET-based ASP board, designed by Nelson Pass. 

User selectable for LXmini, LXmini+2 or LX studio operation.

The board(s) will be made available in our webshop after Burning Amp 2018 (bare or stuffed).
Its tailored, massive aluminum case is beeing produced right now.

Tom Christiansen (www.neurochrome.com) will present his remarkable DIY chip-amp designs, amplifying LXmini+2´s six channels.











4 Beryllium Tweeter Prototypen spielen hier im LX521.4.

Der extrem steife Beryllium Dom hat nochmals einen kleineren Dom Durchmesser als der Standard Tweeter:

Das kommt dem Ideal der Punktschallquelle noch einen Schritt näher.

Das laterale Abstrahlverhalten verbessert sich bei gleichzeitiger Beibehaltung der Abstrahlkarakteristik im Bereich des


Beryllium ist extrem steif, leicht, selten und teuer.

Aber sie belohnen mit einer Präzisierung der Höhen, auch Mitten und Bässe profitieren (Transienten durch erweitertes Obertonspektrum).


Beryllium Tweeter werden auf Sonderwunsch bei fertig gebauten LX521.4 Systemen eingesetzt.

Auf Anfrage auch im 4er Set für Upgrades erhältlich (keine Änderung an Baffle oder Weiche nötig)

449€ p.pc. (EU Endverbraucher zzgl 19%MwSt : €534,31)

4 Beryllium Tweeter upgrade nur 1490€ (EU Endverbraucher zzgl 19%MwSt : €1773,10)



19.Jazztival im SCHLOSS ELMAU.


LXmini vor einer beeindruckenden Alpenkulisse.

Ihr natürlicher 3D Klang überzeugt Jazzliebhaber.





Auch in diesem Jahr fand das legendäre Burning Amp Festival in Ft Mason /SanFrancisco statt.

Eike und Siegfried Linkwitz waren Gastgeber im stets gut besuchten "Linkwitz Lair".

Highlight sollte die Zusammenarbeit der Masterminds Siegfried Linkwitz und Nelson Pass werden.

Nelson Pass´ neues 3-wege ASP mit verzerrungsarmen JFET Buffers versorgt ein LXmini+2 system.

Des weiteren war ein Prototyp der neuen PowerBox 6pro "analog precision" am Start, mit identischer ASP-Abstimmung wie das Nelson Pass JFET ASP.

Die PowerBox 6pro "Analog Precision"  integriert 6 Hypex NCore Verstärker.


Die Digital/Analog-Wandlung muss also vor einer analogen PowerBox stattfinden. Wir haben uns hier für ein ausgezeichnetes DAC Produkt aus dem Profi-Studiobereich entschieden:  arfi DAC2


Beim Burning Amp Festival standen zwei komplette LXmini +2 Systeme bereit.

Aus techn Gründen, konnte lediglich das LXmini+2 via PowerBox spielen.

Und dies umso überzeugender! Erste Kommentare : This system shouldn´t sound so good!

Weitere Bilder: http://www.linkwitzlab.com/BA-2017/lxmini+2.htm

Danke Charlie Laub, Nelson Pass und all die Helfer, die zum Gelingen des BAF2017 beigetragen haben!



Wer die Möglichkeit findet , das diesjährige Burning Amp Festival zu besuchen,

darf auf Überasschungen (Two Masterminds Cooperate) und

interessante Vorträge gespannt sein.

12.NOV 2017 , Fort Mason, San Francisco

BurningAmp : The annual audio DIY event at Fort Mason, San Francisco CA for audiophiles who make their own equipment, components for amps, speakers, and parts.






Das Jazzfest Esslingen lädt zum Empfang in der Kessler Villa.

Dort spielten wir Live Aufnahmen vom Esslinger Festival 2015 auf LXmini+2

Die Musikliebhaber konnten sich von der 3D Bühnendarstellung des

dieses Systems überzeugen.





LX521.4 bekommt eine neue Anschlussoption im Brückenfuss. Die SpeakOn8 Halterungen sind bereits vormontiert. Sie ersetzen die SpeakOn Verbindung (mit senkrecht nach oben verlaufenden Anschlusskabeln) zum Baffle Support. Dies erlaubt eine aufgeräumtere Ansicht der LX521 Rückseite.

SpeakOn8 in bridge foot



Alle Plätze beim Open House waren gebucht. Neben Anreisen aus aus Irland (Cheers Dara!), kamen LX Lautsprecher-Interessenten aus Belgien, der Schweiz und Deutschland.

Es wurde vom Linn Akurate DS Streamer (modifiziert von Dr. Gert Volk) in PowerBoxes 6pro NCore via SPDIF übertragen.




"Faszinierende Räumlichkeit",

"unglaubliche Abbildung mit den LXminis ...",

"..die LXsub2 des LXmini+2 verstärken diese Räumlichkeit noch weiter ..",

"LX521.4 sucht Seinesgleichen ,  unabhängig vom Preis"......

















Probehören von LXmini, LX521.4 und PowerBox ist am Samstag 25.März möglich.

Nahe Stuttgart Flughafen.

Interessenten melden sich bei info@magicLX521.com zur Ort-/Zeitabsprache.



David B. (Sweden) , LXstudio:

Their names are Marley and Yuki and love the music in the house, even at reference volumes. 

When we are listening to music we can be sure to find them on the PowerBoxes




As requested by customers, we are happy to announce that the LX521 kit is now available in HDF as well. See LX521kit HDF.


HDF is a modern high density wooden material, that avoids the downsides of MDF (soaking edges, etc). HDF in dark anthracite:

It is an extremely robust high density, black coloured wood fibreboard (>1,000 kg/m³). Its high strength across the complete board cross section facilitates three-dimensional processing without any risk of fraying. It is a natural material made of wood which defibres gently and is manufactured according to ecological principles.

HDF can be used as extremely compact, robust support board. Thanks to its black colouring and the compact product structure, the board can also be used as an attractive surface without additional coating. 

HDF is ideally suited for applications requiring ecologically sustainable material due to its environmentally compatible manufacturing.



Easy connection and setup tips for a PowerBox MASTER-FOLLOWER-tandem (LX521.4) may be found here.

Press <Pause> if desired to finish reading. Or as Download



Last weekend, we had an audition in Stuttgart/Gemany, where two groups of interested audiophiles from Austria/Germany/Switzerland listened to the extraordinary performance of LXmini and LX521.4, that you cannot buy in HiFi shops.....

A quick review of the setups:

> signal source : LINN Akurate DS (modded by Dr Gert Volk)

> BNC-to-digRCA cable

> LX521.4 on two PowerBoxes 6pro NCore (Master-Follower-Tandem) , interconnected by a Sommer CAT7 patch cable.


> LXmini, fed by a PowerBox4180 (UcD based)




The first PowerBox 6pro NCore pair reached his new owner.

This MASTER - FOLLOWER tandem took the joy of LX521.4 playback to another level.

Listening in a small group , including a well respected sound engineer (Grammy-nominated recordings in his portfolio) , we all observed a joyful richness in details, beeing combined with a pleasant coherence of soundstage and timing.

We were pleased by the ease and naturalness of the artists presentation , coming from this extraordinary LX521.4 system.





Thanks to all of you coming over to the Burning Amp 2016. Hopefully, you had a good time and could enjoy the LXmini +2 demo sessions. The LXminis were built by using precision CNC mitered, anthracite HDF parts. LX speakers are exceptional speakers,  designed by Siegfried Linkwitz. Leaving traditional "box"-design behind.

We played music from the HD of a laptop, running JRiver. This laptop became a high-end music source when connecting its USB output to the AFI-USB noise blocker/reclocker.

The AFI-USB delivered a completely reclocked digital signal to the brand new PowerBox 6pro NCore. Professional 8pole SpeakON plugs at its output connected to the LXminis and SUB2 spealers (= LXmini+2)

Your feedback on the systems naturalness and soundstage was overwhelming ("like analogue, just better" , "realistic soundstage @ various listening positions" , " feels like listening to music and not to equipment" , ......)  Thank you!. If we could not answer all your questions -or of more questions arose later- see the flyers below and feel free to e-mail to info@magicLX521.com

























Further information from our flyers:

The just launched  PB 6 pro NCore      Flyer Down



the upcoming PowerHouse         Flyer Download

and the AFI USB    Flyer Download  scroll down this site  to 05JUL2016 for furter details





Let´s meet 13NOV2016 at the Burning Amp Festival in San Francisco / Ft Mason.



Be among the first to Listen to our new PowerBox 6 pro NCore.

PowerBox 6 pro NCore  Hypex DSP with 6 NCore-amplified channels

is the high-end solution to feed your LXmini, LXmini +2, LXstudio and LX521.4 (for LX521.4 -> one PowerBox per side).

It is all you need between your music player and LXspeakers.

....and PowerBoxes work easily with other speakers (replacing passive crossovers, boosting them to NCore performance). Via USB cable, feel free to load your own filters into the PowerBox. Additionally, adjust every channel in gain, time delay and inverting



LXmini+2 is the latest system design by linkwitzlab. LXmini+2 may easily be supplied by PowerBox 4180.

+2 woofers (= LXsub2) get their signals from PowerBox "line-out" (=Ch5&6).

Fully balanced connection to our PowerAmp 2180.

PowerAmp 2180 is the dedicated amplifier for these LXsub2 woofers

PowerAmp 2180 is based on 2x Hypex UcD180OEM. 699€ (in EU plus 19%VAT)


NEW : Alternatively , you may consider the brand new 6 ch PowerBox 6pro NCore . €2490  (in EU plus 19% VAT)


Connect the PowerAmp 2180 to these LXsub2 woofers with our standard 1-click SpeakON Y-cables.

Y-cables available in 2x5m or 2x2,5m length.


                        PowerBox4180                                                 PowerAmp 2180


LXmini+2 as upgrade kitfrom LXmini:

Special introduction price for LXsub2 kit incl 2x SEAS L26RO4Y woofer drivers: €499 //in EU add 19%VAT





additional tips for LXmini kit FR driver ring mounting:

The FR mount ring is designed for easy mount and tight fit into the upper tube.

But tight fit means also, that the mounting ring might need some pressure of 4 fingers and/or some other measures to make it in.  For mounting,


-make the upper tube stand on a table

-attach the FR mount ring to the magnet (as on the photo) and secure it with a few drops of (hot) glue

-press the FR driver with the attached FR mount ring into the upper tube.

-you may rotate itunder pressure,  left-right

-slight production tolerances (tube inner diameter and mount ring outer diameter) or material edges at the tube cut inner side may be overcome by

deburring (sanding) the inner rim of the tube   and/or the edges of the mount rings blocks (see orange pointers)

warming the tubes first centimeters in hot water

slightly sanding the blocks outer side (blue pointer)




Finally, adjust the last millimeters by equally pressing on the 4 blocks, till the little “noses” touch the tube rim.


Additionally, secure the mounting rings position with a drop of plastic glue at each of the 4 blocks at the inner surface of the tube.

The FR driver sits perfectly.



















Transforming an ordinary laptop, tablet or desktop computer into a high-end music source:

AFI-USB eliminates HF noise and provides a completely reclocked signal (not just PLL)

The typical application with the PowerBox consists of these elements


Computers USB port connecdts via USB cable to

USB unit

-connects with 3 fibre optic cables to-


-connects (ideally) with shielded Ethercon network cable to-

  Adaptor to BNC/digRCA/digXLR


Digital signal routing:      Computers USB port > AFI-USB > PowerBox (or DAC)


The AFI USB concept (excerpt from ACOUSENCE information):

The USB audio-converter module transforms the afi,connected to a computer and a DA converter (DAC), into a full-fledged, very high-quality audio source device for digital playback. The computer becomes a music player. The issues of "avoiding HF interference and clocking precision" are perfected here.

In principle, a computer is ideal for managing a digital music collection and playing back music with regard to its flexibility and operating convenience. Unfortunately, from a sound point of view, a computer is a highly inhospitable environment for the audiophile's enjoyment of music. Computer are machines with calculate at high clocking rates and run innumerable processes during music playback. As a result, they create a broad spectrum of high-frequency interference.

In order to keep this unavoidable interference from the computer away from the sound-sensitive audio section, our USB option has a two-part design:

1. The external USB-FOC module for communication with the computer

2. The internal USB module built into afi, which takes over all tasks of the music playback procedure which are relevant to the sound.

Both units are connected to each other with the help of three fibre optic cables (FOC) for maximum isolation from interference. Thanks to the optical coupling, there is no direct electrical pathway for HF interference from the computer to the audio section. Both units are completely galvanically isolated, so mass flows are eliminated. Secondary effects of the computer on the audio equipment (interference via electric grid and electromagnetic radiation) can also be optimised by the increased distance between the computer and the audio devices. The standard length of the FOCs is two metres; six metre cables are also available.

The most important difference between this and a conventional transmission of a digital audio signal via optical cable from the computer to a DA converter is: if a conventional digital signal is transmitted via toslink, then the clocking signal is embedded within it. The clocking information is at the same time the HF interference of the computer in the form of Jitter, and Jitter is very difficult to completely remove after the fact. Therefore, the optical audio connection does not eliminate the interference from the computer per se.

In contrast, the FOC connection of our USB module contains no clocking information that is relevant to the sound. Therefore there are a total of three FOCs. The only clocking information relevant to the sound is created by two reference oscillators in the Afi module. The audio files are thus clocked under ideal conditions, far away from computer influences. The external USB module receives the clocking information from the internal module as well, but this is only on a "working basis" in order to be able to send the audio files to the internal module. However, neither the clocking quality of the FOC connection nor the clocking precision of the audio stream sent to the Afi affect the sound.

The double (duplex) FOC is responsible for both the clocking to the USB module and the audio from the USB module. The third FOC only transmits the switching signal for each sampling rate family. Depending on whether the rate is 44.1 kHz multiples or 48 kHz multiples, the appropriate oscillator is activated, which then very precisely clocks the audio stream to the DAC, fully independent of the computer.



AFI USB Modul Grafik1


The external USB-FOC module with a USB-B jack (1) to be connected to the computer, Duplex FOC connection (2) and FOC interconnection (3). The RJ45-Ethercon output of the afis or afi is either directly connected via RJ45-XLR cable (4) or via RJ45-RJ45 cable (5) plus adapter box (6) to the DAC.


AFI-USB system incl 3-way optical interconnect cables from USB to AFI Box €1049 (plus 19% VAT inside EU)

RJ45-RJ45 EtherCon cable, 1m , €16,81 ; (20€ incl VAT inside EU)

RJ45-BNC adaptor incl BNC-RCA adaptor €42,02 ; (€50 incl VAT inside EU)




Readily assembled turn-key LXminis in black will be stuffed with black damp wool. The new rear grill keeps the black damp wool in place.




Following customer requests for amplification modules, we are able to announce a compact solution with


UcD180OEM highest qualtity Hypex amplifiers DIY bundle.

You may easily combine this 4x180W assembly with the Hypex DLCPs.

A central board with 4 x 36pin plugs and one 20pin plug allow secure connection.


Package contains 4 180W UcD180 OEM modules , 1 central pcb, 4 36-pin connectors , 1 20pin connector

€449 export  (€534,31 incl VAT)



LXmini+2 woofer additions will be available soon. You may -again- expect a kit of highest quality components, allowing a fast and precise assembly without visible screws etc. Availability and pricing will follow soon.

LXstudio light is another option for LXmini upgraders. Interesting for LXmini owners, that consider a flawless upgrade to LXstudio or LX521 in the future: The LX521 woofer is loaded only with the lower driver, upper drivers mounting hole temporarily closed. Ready for easy upgrade to full woofer power.




The new reclocker and HF-isolator AFI-USB did a convincing job in Corte Madera. A conventional Surface3 pro tablet PC turned into a high-end digital source, eliminating the last traces of graininess.

We were delighted by the kind of phantom stage, precision and naturalness that could be achieved with Siegfrieds LXminis , fed by a PowerBox 4180.

This AFI-USB reclocker is fed by an USB source. It combines HF elimination and a new (high precision) clocking after the optical transmission part. Not just PLL. For best signal transmission, the output is realized with EtherCon interconnects and shielded network cables. The interconnect adapt to BNC, digital coax or XLR just at the next downstream unit (=PowerBox)

If yo want to upgrade your digital USB source with an AFI-USB, just mention it with your PowerBox order. (€ 983,19 export // €1170 incl VAT). Includes 115V-230V power supply.

Will AFI-USB reclocking always improve sound notably?

1) If a digital source (€€€€-€€€€€) is extremely low in jitter an HF-noise , there isn´t much to improve.

2) If a downstream DSP / DAC introduces new jitter and artefacts, the very clean signal of AFI-USB may be messed up again.



"Open House" at Linkwitzlab.

A unique opportunity to listen to LXmini, LXstudio and LX521, presented by the designer himself.... and to experience Eike and Siegfried Linkwitz`overwhelming hospitality.

The interested audience got familiar to the design priciples of these outstanding loudspeaker system. Time for discussion and questions . And of course time to hear these unconventional loudspeakers perform, fascinating the audience with their stable, live-like illusion of musical performance, that does n o t collapse when leaving the "sweet spot".

Visitors could convince themselves by wandering around in the room: The phantom imaging remains stable , no matter where you listen from.

No Room correction at work, no fancy room treatment, no boutique cables. But intelligent engineering and a huge wealth of experience allowed the design of these transducers, that work so well with the room.

All rounded up by Eikes fantatic catering (home-made Brownies and more). Thank you!

Highly recommended , try to get a ticket for a possible future session!





The retired Chief Engineer of SCHOEPS Microphones describes his listening experiences with Linkwitz Loudspeakers in the German TONART magazine #4-2015, a supplement to the physicians "Ärzteblatt".  See page 34.

TONART is also available in the www for browsing or as pdf download here













from the new batch onwards, the "Linear Audio Vol.4"-recommended Sjöström Superregulators SSR01 / SSR02 will have flexibility in output voltage and now come with cables soldered. Output voltage adjustable by 10x turn potentiometer (blue with golden turn knob, see pic below).

Input 14V to 24V --- Output 11V to 21V . Input voltage must be at least 3V higher than desired output voltage.


SSR01 Positive SuperRegulator    SSR02 Negative SuperRegulator



..just to mention a statement from Daniel Weiss (Weiss DACs, Saracon conversion software etc...) on the DSD vs PCM discussion in "connect" 2013:

"Die wahren Baustellen in der Audiotechnik sind Lautsprecher und -Platzierung, Raumakustik und -korrektur, neue Paradigmen bei der Audiowiedergabe (etwa Crosstalk Cancelling) usw. Die "schneller, höher, weiter" Entwicklung, auch bei PCM, ist komplett überflüssig"



Digital jitter may reduce a digital listening experience. Today were able to hear one of these jitter-reducing-devices (latest generation), a pre-production sample of the upcoming MUTEC MC3+USB re-clocker.

HP-laptop/Win7/JRiver, FLAC files over USB > USB Cable > MC3+USB > AES/XLR cable > PowerBox 4180 > LXstudio. So, the set-up was comparable to the LXstudio set-up at Burning Amp Festival last week, except the MC3+USB re-clocker replaced the former USB-to-OPT converter.

The difference was immediate and obvious. E.g. Gene Harris´piano ("Little Darlin`" from Ray Brown:" Live at the Loa") gained substantially in clarity as well did the cymbals.  Remarkable. The MC3+USB forwards the digital music data stream not only bit-perfect but also at the right pace. Once more astonished, what LXmini/LXstudio  can bring to "life".



This years Burning Amp Festival took place in Redwood City/ Silicon Valley.

Thanks to all staff and volunters for making this possible!

In the "Linkwitz Lair", we were able to show Siegfrieds LXmini and LXstudio, fed by our PowerBox4180 (+2xMonoblocks for woofers)

The Linkwitz Lair was mostly taken by fascinated listeners:                  

"In Linkwitz´room, you don´t feel listening to loudspeakers, but to a musical performance"



LX speaker family is introduced to readers of the German Ärzteblatt via its quarterly supplement  "TONART Magazin" . You´ll find news on Jazz, Classical and Pop music. See pg.32 in the online version