Speaker Stories

    Audio Nirvana (I Found It!)

    Issue 171

    A little background: the first article I wrote for Copper back in 2019 was about a speaker demonstration at the home of the late designer and engineer Siegfried Linkwitz (“A Visit to a Linkwitz Open House,” Issue 92). Years before, I had the privilege of paying a visit while Siegfried was still alive. He was a gracious and unpretentious man who gave freely of his time, although he did not know me before I requested an audition. After he passed away in 2018, Dr. Frank Brenner, under the company name of EarFood GmbH took over the manufacture and promotion of Siegfried’s speaker designs as well as presenting demos at the Linkwitz home and other locations. Prior to that, Siegfried had sold only plans for DIY builders, and the Madisound company sold the SEAS driver complement along with a flat pack of cabinet materials for the adventurous to build themselves. Siegfried never got into manufacturing. The Madisound driver kits are still available, but the flat pack is currently out of stock.

    I had contributed a number of photos to the “Parting Shot” feature, but hadn’t written anything for the magazine. Former editor Bill Leebens was going to be in my neck of the woods to cover the California Audio Show. I was looking forward to meeting him, and I let him know about a demonstration of the Linkwitz LX521.4 speakers that was occurring the same weekend. I asked if he would like to attend, but he said he would be too busy covering the show. When I proposed writing a report on the event myself, he thought that would be fine.

    I didn’t consider becoming a regular contributor until Frank Doris took over as editor. One of his first actions was to reach out to all who had written for the magazine, to get acquainted and find out what topics we wanted to write about. I suggested doing some articles on progressive rock and that started the ball rolling.

    Some time later, I wrote about babysitting a pair of very large $90K speakers that belonged to a friend who needed to downsize temporarily (“Once in a Lifetime,” Issue 129). I ended up having them for over a year, during which time I enjoyed them immensely and became convinced that I needed to bite the bullet and buy what would be my ultimate speakers. My friend finally took the big boys back a couple of months ago, and it was back to my MartinLogan Aeon-I electrostatics (w/subwoofer). They sounded pretty good, but it just wasn’t the same…

    It was time to make good on my plan to upgrade. Based on reviews that had intrigued me, I made a list of the speakers that I hoped to be able to audition at home (in addition to the Linkwitz LX521):

    Eikon Audio Image 1 (includes amplification)
    Gershman Acoustics Grande Avant Garde
    GoldenEar Triton Reference
    MBL 120 or 126
    Muraudio SP 1
    PS Audio aspen FR30
    Von Schweikert Audio Endeavor SE
    Wilson Audio SabrinaX
    YG Acoustics Carmel 2

    I have no doubt that they are all worthy contenders, although some (such as the PS Audio) were probably too big for my room. I never got around to trying any of them because I ended up buying the very Linkwitz demo system that our editor had heard (and been impressed with) at the AXPONA show earlier this year!

    I had to order longer speaker cables and pay for insurance and shipping from the Midwest, but they arrived well packed on a 200-pound pallet about a month ago.


    The system delivered, minus the outer box.

    The system delivered, minus the outer box.


    The LX521s are an open-baffle, dipole design that comes with a pair of five-channel amps (with analog signal processing) and dedicated SpeakON cable connections. The woofer cabinet is completely separate from the upper driver baffle, which straddles it with a “bridge.” A very clever element of the design is that all wiring is concealed, save for the last inch or two at the drivers themselves. The cable connections are at the bottom back of the two parts.



    Image of speaker in parts prior to assembly.


    Pardon the mess – this is a real-world living space (that’s my cat’s bed in front of the chair).

    Pardon the mess – this is a real-world living space (that’s my cat’s bed in front of the chair).


    I had to do some assembly, and I have a “Confessions of a Setup Man” story of my own. After I connected the driver baffle to the bridge and had gotten everything connected in place (amps, speaker cables, etc.), it was time to fire them up. I cued up an album, but nothing came out. Panic time! I looked at the amps and thought, “Aren’t there pilot lights that should be lit?” I knew I had flipped the power switches. Well, it turned out that while I was running the rather bulky speaker cables behind the equipment racks, I had somehow dislodged the AC plug for the power strip that fed the amps. Relief! I plugged it back in again and anticipated beautiful music. This time, all I heard was the bass. In checking the connections to the bridge, I eventually realized that these unfamiliar SpeakON connectors needed to be pushed in and turned to lock in place. This time I heard what I was hoping for – incredible sound.


    Given the layout of my living room, I don’t have a lot of flexibility in determining speaker placement. Hardcore audiophiles may quibble with the big-screen TV and the coffee table as reflective surfaces, but the LX521s don’t seem to notice them.

    Given the layout of my living room, I don’t have a lot of flexibility in determining speaker placement. Hardcore audiophiles may quibble with the big-screen TV and the coffee table as reflective surfaces, but the LX521s don’t seem to notice them.


    Photo of the front of the speaker.


    Note the cable connections at the bottom and the relative lack of exposed wiring.

    Note the cable connections at the bottom and the relative lack of exposed wiring.


    I know it’s a bit of a cliché, but these speakers truly disappear. They present a soundstage that is slightly behind the plane of the speakers, but perfectly integrated with the room. Every friend that I have played them for has had the same impression. Even my girlfriend, whose hearing is a bit compromised (and who had never really appreciated the sound I was getting before), agreed that the LX521s were a big step up. Siegfried Linkwitz felt that the speaker design parameters that contributed most to realistic sound were (in order of importance) dispersion pattern, frequency response and power handling. He held a number of views that went counter to accepted audiophile tenets – among them, that room correction was not needed if the speaker was properly designed. He was also not a believer in premium cabling or power conditioners (except in areas prone to lightning strikes).

    Good recordings sound amazing on the LX521s, and lesser recordings still manage to generate a level of interest that wasn’t there with my other speakers. These speakers unravel the most densely arranged elements of a recording. The spatial presentation and delineation of instruments is on another level. My direct-to-disc LP of the LA4 (Just Friends) on the Concord Jazz label sounds incredibly live and present. Bud Shank’s saxophone is in the room.


    Another area in which the LX521s excel involves the reproduction of acoustic (standup) bass. A great demo track for that is Patricia Barber’s slow and sensual cover of Bobbie Gentry’s “Ode to Billie Joe,” from the album Café Blue. The arrangement consists solely of voice, bass, and finger snaps. The bass tone and attack are startlingly realistic.


    Elaborate productions, such as the recordings by Sade, showcase the speakers’ ability to separate every instrument. The complexity of the arrangement of “Smooth Operator” is in sharp contrast to the minimal nature of the Patricia Barber track. A wide array of percussion instruments shares the stage with keyboards, guitar, bass, and drums.


    I’m having a ball introducing true high-end sound to my friends who had never experienced it.

    There may be systems out there with greater resolution (and heftier price tags), but I am one happy camper with these speakers. I feel no need to consider any further changes to my setup unless a piece fails. I might even drop my subscriptions to Stereophile and The Absolute Sound, although I still enjoy reading about stratospherically priced audio equipment.

    For more information, visit the Linkwitz website.

    The Linkwitz Lab website also has a lot of information on a wide variety of topics.


    Header image: Rich is now the proud owner of these puppies. Photo courtesy of Frank Brenner.

    8 comments on “Audio Nirvana (I Found It!)”

      1. Do you just have the driver package, or do you also have the cabinetry flat pack as well? There are five channels of amplification per side required, as well as a DSP or ASP unit. I'm not sure what kind of cabling is needed with the DIY system.

      1. Ned, If it makes a difference, I did get a significant discount by buying the demo system. I know it's a lot of money, but remember, that price includes two 1500 watt five-channel amplifiers. You just need a source and a preamp or volume control. Think of it this way - if I bought a $50,000 Lexus, few people would chastise me for that expenditure. But if I buy the Linkwitz system and a car like a Mazda 3 (my Scion tC has 299,000 miles on it, so I'll be in the market for a new car soon), I'm out the same amount of money, and way happier. Some folks spend that kind of money on jewelry...
        This is the sound I've been dreaming of for decades.

    1. Hi
      I have the Linkwitz 521.4s too. I also love them. May I ask what amps you are using? And do you layer on any additional DSP or are the standard Linkwitz 521.4 crossover settings OK for your room?

      1. I am using the two PowerBox 6pro Ncore precision analog amps/crossovers that come from Linkwitz. It's as though the system is unaffected by room acoustics.

    2. I built maybe the 6th or even 5th pair in the world many years ago close on the heels of my good friend Steven H (also RIP) who completed a pair too. We both have built Siegfried's Pluto and Orion models and LXmini's too (I still have all 4 models).

      Mine started out as LX521 and were updated a number of years back to the .4 reference with the Hairball ASP's - so its full analogue through the crossovers. I'm using Lexicon DD8 8 channel amps (one per side) to drive 5 channels @ 128WPC.

      Sound is gorgeous and I will never need to build or by anything else for my listening pleasure - but the Orions also get a lot of playing too, as do the LXmini now and then - the Pluto are kept just for sentimental value, but they are still fully operational too.

      Dr. Frank Brenner is a great resource/manufacturer and is active on the OPLUG forum where SL's designs live on.

      I'm based in Singapore and my build log is here http://walaneh.com/LX521/ sorry for the terrible documentation.

      Highly recommend build!

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