"After just a couple of minutes of Thrasher Dream Trio, a jazz album featuring drummer Gerry Gibbs, pianist Kenny Barron and bassist Ron Carter, I realized, "I'm really enjoying this!" I didn't hear any of the kinds of flaws that would normally distract or discourage me when first "meeting" a speaker. No obvious "cupped hands" coloration from the woofer. No boom in the bass. No major frequency response anomalies. No edge, grit, glare or grain. Just really good sound."
"Anyone who needs to be sold on why high-end audio is worth the expense would probably be persuaded if they hear saxophonist Gene Ammons' recording of "But Beautiful" through the SMS1. You get a gorgeous, almost glowing rendition of Ammons' big, romantic sound; portrayals of drums and piano that sound accurate and realistic without sounding over-realistic, and a natural sense of space that captivates you without trying to wow you."
"If you're looking for a high-end bookshelf speaker -- or even just for a good speaker, period -- you should give this one a listen. I think you'll realize, as I did, that after the first couple of tunes, you're blown away not by how spectacular the sound is, but how good it is."
- Brent Butterworth, Stereos.About.com
"Going into this test, based on measuring previous Benchmark products, I expected excellent performance. The benchmark HPA4 shattered even that high bar. It brings such a high performance to the table that leaves no doubt whatsoever about its transparency. No stone has been left unturned to optimize audio performance of this device. Even obscure measurements like ultrasonic interchannel phase shift is nailed."
"And then we have tons of power without messing with balanced cables and such. Plug in any headphone and you are in heaven."
"The preamp performance is even higher still, breaking and shattering any expectation one would have in a lab instrument let alone a consumer hi-fi."
"It goes without saying that the Benchmark HPA4 garners my strongest recommendation for a headphone amplifier and preamplifier. It doesn't get better than this folks."
- Amir Majidimehr, Audio Science Review
"I ended up visiting this room more than any other room at the show. I couldn’t help myself; I had to keep coming back for more!"
- Drew Gagliano, TheAudioBeatnik.com
"It’s ... been a while since I have been this excited about an audio product."
"Audeze LCD-2C, Quad Era-1, Brainwavz Alara, Sennheiser HD650 ..."
"It’s the first time when I have heard the headphones mentioned above to their full potential. In the first minute my jaw dropped ..."
"From my perspective this is the best headphone amplifier I have ever heard. It’s no competition really."
"It’s not cheap, I can give you that. Is it worth it? That is up to each and every one of you, but if you really want the best amplifier out there, an end game amplifier…this is it."
- Dan-Alexandru Gheorghe, HeadMania.org