Stenheim Alumine Three loudspeaker

The made-in-Switzerland Stenheim Alumine Three floorstanding loudspeaker sells for $32,900/pair. It is not only the most expensive component I've reviewed for Stereophile; it costs more than 10 times (!) as much as my $3000/pair reference Falcon Acoustics Gold Badge LS3/5a speaker. So naturally I wondered: Will it sound 10 times better? And if it does sound 10 times better, what might the nature of the improvements be?

The Alumine Three (footnote 1) is a slender, floorstanding speaker measuring 41.3" high, 9.8" wide, and just 13" deep. Because it contains four sturdy drivers bolted to a thick, bottom-ported aluminum cabinet, it weighs 154lb each. Importer-dealer Walter Swanbon dragged them in on a hand truck with fancy pneumatic tires and set them on my floor in the exact spots I pointed to.

He said, "Herb, I promise you'll like these speakers. They're a serious, top-end design. With paper cones. Voices sound human. Instruments sound natural. They are designed to compete with speakers like Magico and Wilson, but they are easier to drive. You can use all your low-powered amps." He added, "And they fit in nicely in regular people's living rooms. They're not as fat as the wide Harbeths or as tall as the tall Wilsons." As Walter pitched the Stenheims, I kept nodding and repeating, "Wow, that's cool."

I was skeptical. I seriously doubted they'd play well with 25 watts. I was however surprised and impressed by how tastefully tailored Euro-svelte the Alumine Threes looked in my room. Not glitzy or shiny. During my previous auditions (in audio show rooms and dealer showrooms), Stenheim speakers always did their obligatory Swiss-precision thing, but their natural, nonmetallic tone kept the music and the humans making it at center stage.

As soon as Walter left, I connected the Alumine Threes to my 25Wpc Pass Labs XA25 stereo amplifier and played Cheikh Lô's Balbalou (24/96 FLAC, Chapter Two Records/Qobuz)—and dang me if I didn't think, yep, sure enough, these speakers do sound expensive. (Expensive is a sound descriptor I've never used before. Here, it means "exquisitely formed.")

And Walter did not lie about how easy they are to drive. At my normal, average 75–85dB listening levels (C-weighted at 2m), the Stenheims performed effortlessly with 25 watts.

The first thing I noticed about the Alumine Three's basic sound character was how unusually smooth (frequency-wise) and well-articulated (transient and detail-wise) they were. Throughout my auditions, the Alumine Three's most obvious and appealing trait was its well-structured, evenly focused clarity.


After a few random tracks, the Imp of the Perverse (aka Herb's shoulder demon, my constant companion) began jabbering in my ear, insisting I try the 10W into 8 ohms RAAL-requisite HSA-1b speaker and headphone amp I'm writing about in this month's Gramophone Dreams. The 3" tall demon shouted, "Pass Labs lied! The XA25 puts out more than 25 watts." (Which is true. John Atkinson's measurements showed that the XA25 can deliver 80W into 8 ohms and 130W into 4 ohms.) The Imp was sure the $32,900 Stenheims would suffocate trying to breathe with only 10 watts.

When, as usual, I did what the Imp told me to do, the Alumine Three seemed quite comfortable with 10 watts. Betting the RAAL amp would clip, the Imp kept bugging me to turn the volume up, but even at higher-than-normal listening levels, the Alumine Threes breathed easily, playing Evelyn Glennie's watt-sucking Concertos for Mallet Instruments (24/96 FLAC Naxos/Qobuz) at 85dB with short, seemingly undistorted 99dB peaks. The Imp grumbled indistinctly.

Tall, handsome, and sensitive
The pdf brochure on the Stenheim website specifies the Alumine Three's sensitivity as "93dB, half-space." I recognized that "half-space" expression from buying raw speaker drivers, but I wondered why Stenheim was stating it that way in its specifications. When I asked Walter Swanbon to clarify, he connected me with Jean-Pascal Panchard, Stenheim's owner, CEO, and chief designer. "For this measurement, our loudspeakers are placed directly on the floor, one boundary, and therefore a half-space," Panchard told me in an email. "The ceiling [and] rear and side walls can have different impacts on the frequency-dependent sensitivity based on the loudspeaker location and the wall materials (absorbent and/or reverberant). The half-space value is then the minimum sensitivity a user can get in a well-damped monitoring room." Stenheim specifies the nominal impedance as 8 ohms with a minimum of 3 ohms.

The Alumine Three's driver lineup consists of two 8" woofers and a 5" midrange, all made of a "proprietary multi-layer cone material" that Jean-Pascal describes as a "high-strength cellulose fiber impregnated and coated on both sides with damped resins." Midrange and bass drivers are made by PHL Audio. Above the midrange cone is a 1" silk-dome tweeter with a neodymium magnet, from Scan-Speak.


The bottom woofer employs a "high-excursion half-roll HBR rubber surround." The upper 8" woofer has a pleated textile surround. According to Jean-Pascal, "the transducer with the rubber surround is used to achieve bass-extension, and the woofer with the fabric surround is for better transient reproduction."

According to Panchard, the two bass transducers are tuned to share the same low-frequency enclosure volume, but the two drivers have different low-pass turnover points. Both drivers' back waves exit through a narrow slot-type port situated along the front of the cabinet's bottom.

The Alumine Three's crossover uses Mundorf components and is divided into two parts: the bass section (mounted in the bass compartment) with turnover points at 145Hz and 300Hz, and the mid-tweeter part (mounted in an upper compartment) with a 2.4kHz crossover frequency.

The Alumine Three's chambered, internally braced cabinet is built from CNC-machined aluminum panels of thickness that varies between 0.5" and 1".


Before Swanbon delivered the Stenheims, he told me on the phone, "I know your room and how speakers sound in it. The Stenheims will drop right in." Which they did, within inches of where I pointed. After Walter left, I moved them a few inches closer together and experimented by varying the distance from the front wall. As I moved them about, their tone character and focus changed barely at all. Their "listening window" seemed broad in the horizontal plane. What seemed to matter most was toe-in. I ended up with the Threes 6' apart, with 33" between their front faces and the wall behind them. Image focus and high-frequency tone seemed best with the Stenheims toed in so that they crossed just behind my head.

Normally, I slouch on the couch with my ears between 34" and 36" from the floor, but the Alumine Three's tweeters sit 38" above the floor. Listening to dual-mono pink noise (from Stereophile's Editor's Choice CD) confirmed my casual listening impressions—that they're at their best a little higher than my usual slouch—which encouraged me to either keep my head up or move my seat farther back. I tried both.

Footnote 1: Art Dudley reviewed the earlier Stenheim Alumine standmount loudspeaker in April 2012 and the floorstanding Alumine Five in March 2018.—Ed.
Stenheim Suisse SA
US brand ambassador: Fidelis Distribution
460 Amherst St. (Route 101A)
Nashua, NH 03063
(603) 880-4434

MhtLion's picture

Sharing my own limited experience. It clearly was one of the most un-colored speakers I've heard in a good way. However, it sounded boxy to my ears. The speakers were driven by CH Precision. Mr. Stenheim was attending the demo himself, so I suppose the set-up was ideal or near ideal. Of course, it could been the room.

orfeo_monteverdi's picture

[MhtLion wrote] It clearly was one of the most un-colored speakers I've heard in a good way. However, it sounded boxy to my ears.

//please forgive my poor English

How can a speaker sound both un-colored AND boxy?

I have never heard the Alumine Three, but the Alumine Two (2 ways) and the big Refence Ultime 2 (double d'Apolito, 5 drivers) are the most un-colored AND unboxy speakers I heard since a very long time.

The Stenheim Refence Ultime 2 (+DartZeel monoblocks), presented by a French dealer, was by far the Best Sound Of The Show in Brussels this weekend.
(but...wait, there is yet another big show in Brussels in November ;-)

My reference is live, unamplified music (I attended 37 concerts last season, in various concert halls, usually very good ones, in the best seats).

Positively gobsmacking:

tonykaz's picture

I wonder if this Swiss Loudspeaker is as good as my pair of Sennheiser headphones ?

I contend that the Sennheiser HD580/600/650 series headphone is a better transducer system than any loudspeaker I've ever heard ( probably 2X better )!

But 10X Better ? , that is a TALL claim. Even in this HighEnd world of superlative descriptives! Why didn't the Stereophile Editors position this Transducer more prominently on the Front Cover? ( that record player wasn't a believably better transducer, was it ? or have a more believable reviewer ? ( easily doubtable )

I've experienced products that Mr.HR describes, I've found his writing accurate if not conservative in praise. He is Stereophile's top tier Reviewer, for sure, a no bulls#$%^ting reporter, a journalist and NOT a shameless product Promoter.

Somewhere, Stereophile has a Glitzy loving hand on the Controls, keeping a keen eye out for Click Bait gear to Carnival tease the spectator crowd of gawkers. Publishers believe the Front Cover sells. I guess that I'm pleased that this monthly isn't focused on Scandalous and Celebrety front covers about nude swimming Store Owners, Importers, Writers, etc.

So, a solid Aluminium enclosure ( reminiscent of the Celestion SL600 ) , outstanding drivers ( made by whom? ) and a well engineered and auditioned Crossover built of outstanding components . Probably has carefully selected wiring. The $32,000 price seems a Retail Price designed for a 50 point Retail Arrangement ( not Internet direct sales ) and it's manufacturing Cost is 20% of that = about $6,000. It's gonna be a tough Sell, an Alfa Romeo / Vespa type of thing.

Who is in this demographic ?

Tony in Venice Florida

ps. PS Audio is about to release their $20,000 Loudspeaker at RMAF

John Atkinson's picture
tonykaz wrote:
Somewhere, Stereophile has a Glitzy loving hand on the Controls, keeping a keen eye out for Click Bait gear to Carnival tease the spectator crowd of gawkers. Publishers believe the Front Cover sells.

See my discussion on why a magazine chooses "aspirational" products to be featured on its front cover at, Tony. Stereophile's worst-selling issue on the newsstand in recent years was one that featured an excellent-sounding but also extremely affordable integrated amplifier from NAD.

tonykaz wrote:
I guess that I'm pleased that this monthly isn't focused on Scandalous and Celebrety front covers about nude swimming Store Owners, Importers, Writers, etc.

Basic publishing wisdom is that the front cover must reflect the content. One of the reasons Fi magazine ultimately folded was that the editor decided to feature musicians on the cover, on the grounds that music was the hi-fi hobby's fundamental driving force. However, the magazine ended up being racked in a newsstand's Music section, where browsers were turned off by the audio content, rather than the technology section, where it may well have found new readers.

John Atkinson
Technical Editor, Stereophile

tonykaz's picture

Thanks, I agree with your responses. I even kinda said so in my comment in the Conspicuous Consumption article .

I didn't mention it but I noticed a typo error in Mr.HR's article leading me to ponder ??? what happened to your outstanding proof reader and re-writer guy? Personally, everything I write is filled with spelling errors and all manner of nonsense ( from interruptions, lapses, phone calls and important messagings ). I have to re-write 4 of 5 times to make any sense. For work, I rewrite work pieces with one day spacings and have a reader check after I become a tiny bit confident ( then restructure the entire piece ). Careful Writing is hard work.

By the way, your Canadian is blooming into something special. I think you've got another good one.

Sorry to hear about your NY,NY falling apart. Louis Rossman, the Right to Repair Guy, is doing YouTube Electric Bicycle Tours of your areas. NY seems to still be the Trashy place I've always known it to be but with Crazy Rents and Covid fears.

The Viral scientists are reporting that everyone will eventually get the Covid Virus. I've already had it, it's no big deal.

Thanks for Writing,

Tony in Venice Florida

rschryer's picture

Very happy you like my writing. I like yours, too.

tonykaz's picture

You are providing critical information to an attentive audience of interested consumers.

Your beautiful packaging of ideas into word constructs are like flavourful Ice cream cones.

You have the vision and the touch.

I'm complimenting your editors here, they deserve applause for turning you loose with word budgets. They discovered a wonderful asset.

Tony in Venice Florida

ps. Stephen King wrote the definitive book on the Writing Process, it's a small book.

robertbadcock's picture

Been reading 'you' / Stereophile since the hand held digest age of past; can't thank you enough for being so consistent; and as always; the proper English representation.

Mr. B

John Atkinson's picture
robertbadcock wrote:
Been reading 'you' / Stereophile since the hand held digest age of past; can't thank you enough for being so consistent; and as always; the proper English representation.

Thank you Mr. B.

John Atkinson
Technical Editor, Stereophile

pbarach's picture

RMAF is canceled for this year, and the organizers have decided (and announced) that they won't be doing an RMAF in the future.

tonykaz's picture

Thank you for passing that along, it's Bad news.

PS Audio just spoke of Showcasing their NEW version of the Genesis Loudspeaker at RMAF.

Covid probably killed it and is a catylist for our changing economics.

Amazon & eBay are changing Retail.

Food & Beverage joints are weakening and disappearing.

Tesla has become the Largest Automaker , all without having any sort of traditional Dealer Network.

Schiit is a runaway success despite a shitty name, power switches on the rear and no Retail outlets.

PS Audio is pretty much a Mail Order Specialist.

The internet and individual research seems to have replaced Salespeople for personal sales.

Streaming seems to be replacing CDs and Radio.

We've all lived like Amish for the last 11,000 years, then Ben Franklin discovered Electricity and we went on a tare of discovery.

Who can see two years over the Horizon? Phew

RMAF was the intellectually finest Audio Show I've ever been to or displayed at. The Seminars were outstanding. RMAF was the Good ole days!

Covid killed an institution,

I'm gonna miss it!

Tony in Venice Florida

thatguy's picture

The internet and individual research seems to have replaced Salespeople for personal sales.

For the lower to mid priced stuff it seems youtube pitchmen have replaced the individual salesperson. It is normal now to have items that are hyped by a youtube personality sell out and the comments are full of "I bought this based on your recommendation" notes.

Many of them have achieved what in store salespeople dream of; the customer thinks they are their friend, giving them friendly advice.

Jason Victor Serinus's picture

Oops. Comment removed due to redundancy.

Axiom05's picture

{The Viral scientists are reporting that everyone will eventually get the Covid Virus. I've already had it, it's no big deal.}

Tony, glad COVID was not a major issue for you. There have been over 700K deaths in the US from this virus and I doubt the surviving relatives would agree with you. Don't be so insensitive, maybe you need to spend a bit longer on writing your posts. Having an uncle who came damn close to dying from it, I'd say that it is a big deal. Besides, your comment has nothing whatsoever to do with the topic at hand.

Ortofan's picture

... both Stenheim and Harbeth.

Does Walter Swanbon agree with Alan Shaw that the bespoke plastic formula Harbeth developed is the ideal midrange/mid-bass cone material?

If so, does that then suggest the Stenhiem speakers, with their paper cones, are inherently inferior?

Or, is Fidelis handling the Stenheim line in order to offer products to customers for whom even the top Harbeth model is too inexpensive and/or want a more modern cabinet styling?

Jason Victor Serinus's picture

Every one of your questions is based on your own personal value judgments. Why don't you call Fidelis A/V and ask them?


Ortofan's picture

... consider doing some investigative reporting.

If a given importer/representative fully accepts the design philosophy of a particular speaker manufacturer - plastic driver cones and thin-wall wood cabinets, for example - how do they convincingly also act as importer/representative for another speaker manufacturer with an entirely design philosophy - paper driver cones and aluminum cabinets - without giving the appearance of being at least somewhat disingenuous?

If one company's set of design choices - based on the outcome of government-funded and BBC research programs, for example - is deemed correct, then can another company demonstrate the basis that supports the appropriateness of their entirely different set of design choices - and successfully refute those of a competitor?

Jason Victor Serinus's picture

Your statement presupposes that there is only one "right" way and one path forward, and that a distributor's personal beliefs and philosophies are reflected 100% in the products they sell. Neither is true. Nor should it be otherwise.

You, of course, are free to believe otherwise. I shall leave you to your beliefs and withdraw from this conversations.

Ortofan's picture

... in which (in the first three panels) the same salesman is shown stating to three different customers about three different speakers that he has a pair of those speakers in his own living room.
The last panel shows the salesman, now at home, sitting in a recliner and watching TV, while visible in the background are pairs of each of those three speakers, still in the boxes.

supamark's picture

The distributor is a smart businessman who realises that Stenheim and Harbeth make speakers that sound very different and appeal to different tastes, and simply wants to serve a wider market.

Occam's razor, you should use it more often.

Mark Phillips
Contributor, Soundstage! Network

Ortofan's picture

... the purpose of hi-fi audio equipment to recreate the live event as closely as possible - and if two speakers sound very different, can they both be correct - or is it to appeal to a given listener's variable subjective taste?

It seems that, once again, we return to the question posed long ago by David Hafler: Should a piece of audio equipment be "pleasant sounding, or should it be accurate even if accuracy is not as pleasant?"

Jason Victor Serinus's picture

The purpose of good audio equipment is to reproduce, as faithfully as possible, what the artist(s), producer(s) recording, mixing, and mastering engineer(s) want us to hear. That is different from "recreating the live event." Besides, the "live event" sounds different in different environments. There is no absolute sound.

Anton's picture

Everyone has their own absolute sound, which I will define as searching for 'personal sonic verisimilitude.'

You do it, too. Your reviews are chock full of references to the absolute sound of live un-amplified music occurring in real time and space.

You can tell in a split second 'real vs. reproduced,' the absolute sound is your cue.


That being said, we can then start to argue about whatever else the what the artist(s), producer(s) recording, mixing, and mastering engineer(s) want us to hear.

Isn't that as ineffable as the absolute sound?

Jason Victor Serinus's picture

That's all that need be said.

Ortofan's picture

... absolute sound source available to you?
What about the sound of the voice of someone known quite well to you, such as that of a family member?

Try making a recording, using a good vocal microphone, of that individual speaking.
If possible, make the recording while outdoors to approximate anechoic conditions.

Now, play the recording back on your audio system.
How faithfully does the reproduced sound correspond to the sound of that person speaking to you live?

Also, you might record your own voice (or perhaps your whistling) and ask the family member to make the same comparison.

Know anyone who plays an acoustic (unamplified) instrument?
Try recording them and then evaluating the reproduced sound.

Anton's picture

Check out the Stereophile demonstration discs. They are great fun and have a section comparing different microphones!

The choice of microphone greatly impacts how someone/something sounds on my system.

The moment you told Jason that the absolute sound can be captured, you left behind the absolute sound.

I don't mean that in a pejorative way, I'm just saying that even the most transparent bottle can't allow you to have the same firefly experience as enjoying unbottled ones.

Seriously, that Stereophile Demo disc will amaze you.


I might go out on a limb and venture to guess that JVS has spent more time listening to the true absolute sound than 99% of other reviewers. I've had the fun opportunity to 'watch' JVS listen, both in my days in the Bay Area Audio Society and at shows: he has a killer ear and a rock solid live unamplified music foundation. (Not saying that, like all audiophiles, he sometimes might hear things that aren't there...;-D....but, man, don't we all.)

This is an eternally fun topic, cheers to all audiophiles today! Here we are alive and able to argue about a luxury such as the wonderful time we spend listening to music, on the Hi Fi.

Ortofan's picture

... "There is no absolute sound."
I suggested that he could use the voice of a family member as the "absolute sound".

Of course some microphones are more neutral than others. Sometimes the choice of microphone is used to deliberately color the sound. I've used B&K microphones for four decades, so I'd suggest using the DPA 4011.
Which microphone would you suggest using for a vocal recording?

Although, to use your analogy, while even the most transparent bottle can't allow you to have the same firefly experience as enjoying unbottled ones, perhaps we can find a "bottle" that is sufficiently and satisfyingly transparent such that the experience of looking through that bottle is close enough to the "unbottled" experience for those times when we can't be present at the live event.

supamark's picture

You asked why a hi-fi dealer would carry gear from different mfgs that didn't have the same house sound or look. The simple answer is, to make more money - which is essentially what I told you. The rest is your own need to stir the pot by continually "just asking questions."

Mark Phillips
Contributor, Soundstage! Network

Ortofan's picture

... the question I asked. Reread my post.

JHL's picture

...although it inadvertently exposes the bias that supposes that the goal of speaker A is the often-malformed abstract that since there IS some magical way to render "accurate" sound, Speaker A must be doing so. Or amplifier X and so on.

There IS no accurate sound. There is no basket of specs and parameters with which to reproduce it. There is no single way to design and make a speaker. Therefore, "accuracy" is as much a fallacy as is the projected your-***-is-colored nonsense from self-styled, un-eared "objectivists" whose only metric is a third party projecting a datum and then applying it to presumed sound, blissfully ignorant of everything else the speaker is doing. Likewise all audio components.

If Speaker A not only can't do this supposed accuracy objectivists go on about after they've been biased by data, and if Speaker B isn't allowed into the fold, then the problem is obvious.

It raises the question why we're doing audio. Why are we doing audio? Comments threads? False projections? Debate? Begging the question about "accurate" speakers - when there is none - is ironically the way to generally get lesser sound.

Simon Moond's picture

I am a bit surprised that someone with the audio reviewing experience, as Mr. Reichert surely has, would think that paying 10x (or any other multiple), would yield a sonic improvement commensurate with that 10x money spent.

Once one reaches a certain level of audio performance, spending double, triple, or even 10x the money will never yield that same amount of sonic improvement. At that point, spending 10x the money, will yield improvements in smaller increments. It is up to each individual to decide, at what point, the large expenditure is worth the small improvements.

After all, there are quite a few people out there, that wonder if spending 10x more for Herb's LS3/5a, over their ELAC Debut B62, will get them 10x the improvement.

I would say "no" to both situations. But that does not mean that either price increase is not worth the money.

Anton's picture

I would not argue with that conclusion one little bit!

The premise, I guess, is that the Falcons are 'worth' 3300 bucks in the first place.

I thought Herb's review was pretty terrific.

The only downer in the review was this part: "I never imagined how much previously undelivered recorded information the Stenheim Alumine Threes would bring into my room."

It made me a bit sad to think Herb had to live to his current ripe old age of 39 to hear how much 'undelivered recorded information' he's been missing all this time. I'd be pissed, I think.

I once read a review of some Stax headphones wherein the reviewer mentioned he had managed to go from 1960 to present day without ever having heard a pair before.

Even our most peripatetic and cosmopolitan reviewers can wash up on unfamiliar shores!

ok's picture

and if anything makes me like it even more.. then so be it.

Anton's picture

I wonder if it would be fair to say we choose our systems based on how they allow us to editorialize the sound to our liking.

Cheers, man.

robertbadcock's picture

I miss the Absolute Sound.

I'd like to think that JGH and HP are having an amiable argument; with responses a month apart; while sharing a port.


MikeP's picture

You just need to match these speakers with the new E.A.R. V-12 Integrated amp to make them SING ! MATCH MADE IN AUDIO HEAVEN