It does not swallow energy like raw MDF. The four-inch Fostex FEEZ is an amazing driver. Not as directive as the bigger siblings, it has marvelous midrange . : Fostex FEEZ ‘Sigma’ – 4″ full range driver with paper cone and ferrite magnet. Fostex FEEZ Sigma Diametermm. Fibre Cone Full Range Features include a unique Hyperbolic Paraboloid shell diaphragm, UDR taniential edge.

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This review page is supported in part by the sponsor whose ad is displayed above. Premier three-tier, filled with sand Powerline conditioning: I remember the first time I heard a horn loudspeaker.

I thought it was the worst speaker I’d ever heard.

6moons audio reviews: Gemme Audio Concerti

Tostex was no bass or treble. There was little in the way of precise imaging, soundstaging or any of the standard qualities one expects of a high-end design.

Furthermore, I could hear a cupped-hands sort-of-boxy coloration. Those speakers sounded – well, horny if you catch my drift. I listened casually over a couple of hours and then suddenly, somehow, those aforementioned colorations didn’t offend as much.

Music became curiously more real and visceral. I could feel the music in my chest. The resonant nature of pianos and violins was more life-like. It turns out that horn- loaded speakers, while hardly perfect, offer a totally different yet completely valid listening experience that may startle those raised on conventional dynamic speakers.

They may even sound hopelessly broken. Sure, the lack of extension at both ends of the spectrum plus judicious coloration levels are caveats – to some even fatal flaws. You just might forget fussing over traditional audiophile minutiae and instead re-explore your existing record collection and perhaps even expand into other music genres.

Enter the Montreal-based Gemme Audio Concertia modern high-tech variation of the venerable rear-horn loaded loudspeaker. Since Gemme Audio is a relatively new entry onto the audio scene, the company’s Robert Gaboury provided me with plenty of background material. Considering that Robert was so forthcoming and enthusiastic I wish all manufacturers were this helpfulI thought it best to condense our email exchanges into a quasi interview.

Occasionally — as in the case of Robert or Green Mountain Audio’s Roy Johnson — someone has truly poured their heart and soul into their product and it seems only fitting to share this whenever possible. I think you will agree that Robert has the passion when you read his comments. Since I’m not familiar with Gemme nor are our readers, could you provide some background history as well as a description of the Concerti? They are CNC machined out of machine-grade MDF sheets and heat-pressed with heat-activated urethane glue to form a solid block.

The inside panels and horn path are then sealed and lacquered with polyester-based lacquer. When the insides are finished, everything is assembled, re-finished and “cooked” again to provide a complete enclosure hard as rock and almost as heavy.

The driver is mounted on a birch plywood plate finished with a compound called Effecta Gomma a form of rubber coating. The whole enclosure sits on machined leveling feet. Connectors are Cardas OFC. My speaker design career started in a destructive way. I carried out my first speaker project at the age of 8 by destroying a portable AM radio I got for Christmas. Later on, I destroyed and reconstructed my mom’s Telefunken table radio, then my father’s cherished Grundig console.


After those first projects, it was made clear that if I wanted to experiment more, it would be with my own allowance money. In Canada, the only readily available drivers then were Philips and Radio Shack so during the next 8 years or so, I bought every one of them. I got into art school at 16 and at that time, all students were either members of a band, groupies or roadies.

I was the tech guy, building horn enclosures for bands and friends. My first love was a JBL scoop.

To me, the scoop was the most beautiful enclosure ever. No enclosure to speak of, just a set te108ez panels and curves giving an absolute kick. Nothing can approach the sound of a full horn setup. Later on, I experimented a lot with both horns and really small drivers and enclosures such as the Philipswhich — apart from the full range — was the best-sounding driver.

So I like horns for ve108ez dynamics but I also enjoy sealed and reflex and TL enclosures. There is no perfect speaker just as there are no perfect dogs. My favorite instrument is piano, especially the concert fr108ez.

When I was younger, punch and dynamics were my top priorities. When I got older, I became hooked on harmonics, especially large pianos and room harmonics. Blind people never hit walls. They don’t see walls, they hear walls.

Being able to hear walls and boundaries also became an obsession. I became aware of Fostex drivers a few years back. I was not interested in the full range aspect of those drivers but only in the specs, which made making small scoops or back-loaded horns possible: These enabled me to build scoop-type enclosures that would fit in a fe108ea. But I also discovered that full-range sound meant absolute integrity of harmonics.

Now that was interesting: It fe018ez means that you can “hear walls” on well-recorded live music. We are constantly fiddling with the design of the Concerti.

Fostex FE108EZ ‘Sigma’

The product core is where we want it to be but the details are still being worked on. For instance, all new Concerti v2 will feature leather wrapping inside the horn ce108ez to kill any HF content that might still be present in the path. Also, we are still working on the resonant aspect of the enclosure. Concerti v3 might or might not feature slot openings on the mouth’s sides to equalize the high mouth pressure with the low room pressure, designed after gun silencers.

We are also working on advanced composite construction using MDF, steel panels and leather. I met my business partner last year. I sold him one horn I built. He was impressed with the sound and was interested in selling the same speakers to others.

Fistex was not interested in building any more of those. I’m not a cabinet maker. I sold him the horn because I did not like the sound anyway it was based on a Fostex FEEZ, a nice driver but too directive and “hard” for my tastes. So we built prototypes, then CNC’d prototypes and thus the Concerti was born.


It was a difficult birth. It’s also the worst material to build horns with. Horns are resonant enclosures. Playing with resonant enclosures is like dealing with the devil.

There is a Mr. Jekyll thing to horns and resonant enclosures. So we had to find ways to alter the MDF’s damping. The answer was to use polyester lacquer on all inside curves. Polyester is used on pianos, it’s hard as glass and also breaks like glass if hit hard enough and transformed the MDF into something that was perfect for the design.

It does not swallow energy like raw Fostsx. Not as directive as the bigger siblings, it has marvelous midrange, a nice top end and gives credible acoustic bass, which is kind of spectacular considering the small 2. It’s slightly directive, so first reflections are reduced, improving focus in smaller spaces. Gemme Audio is ff108ez a one-product company.

I like the Concerti for its ability to deal with ambiance and detail in smaller rooms. I also know that there are other avenues.

In the works are other designs: Jean-Pierre is an obsessive-compulsive audiophile who will spend countless hours mounting and dismounting drivers, tweaking and re-tweaking cables, damping – every minute detail is tested and retested. My part often stops with the rough outline, the basic design where I get things where I want them. Jean-Pierre then takes over and tests everything on all kinds of equipment chip amps, solid state, tubes of all varieties, different CD players, etc.

He tries to get a hold of the best possible way to integrate our products in the audio chain. The Concerti pair you have is wired with a special cable made out of single-strand copper, silver and gold conductors courtesy of Jean-Pierre and his friends from 6 Sons Audio. To put it in hockey terms, I get the puck out of the corner while JP gets it in the net. We also work with other players, namely from the Montreal Audiophile Association, a very active bunch of guys who love to test new ideas and products just for the fun of discovering things good and bad.

The biggest challenge in building the Concerti and all upcoming Gemme Audio products was to find the right people to build it. We changed woodworking shops three times before finding the right CNC shop to cut the parts, the right craftsman to assemble the parts, the right paint shop to get perfect finish, the right machine shop to machine steel and brass and aluminum parts, the right finisher for chrome and zinc plating and buffing.

When we decided to finish the horn with leather, we had to find the right “maroquinnier” and so on. After all those headaches, we finally found the properly dedicated, quality oriented bunch of artisans. That was the hardest part. Today we have assembled the perfect team to tackle any project.

I guess that’s what Gemme is all about. Sure it’s about sound. Sound is the core of Gemme.

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