AHB2 - "Tightness, accuracy and punch"
"The most identifiable positive trait (there are many) of the AHB2, and that is low end control. Tightness, accuracy and punch."
"The AHB2 has power in spades, especially with two units running in mono mode."
"A single amp in stereo will suffice for most normal situations, and was in full control of all sonic responsibilities with every pair of loudspeakers we threw at it."
"The low end tightness and thrust is just where it should be, and pass though information is the name of the game."
"The topology and overall design hopes to touch on a new direction for more traditional audiophile ways. A “bipolar class AB output stage” is married with class H (hence “AHB2”) and some THX-AAA Technology (Achromatic Audio Amplifier) and makes claims of superior performance to the high-end fav, class A."
"The back panel offers up a whole host of connections including balanced in, standard speaker binding posts, NL2 2-pole speaker connections, 12v trigger."
"The sound of the amplifier is true to source and one that takes many queues from the production world of balance and monitoring."
"... will rock the house (or sooth the baby to sleep)."
"Since the HPA4 arrived, I have rediscovered so many of my favorite works all over again with improved detail retrieval dynamics and transparency that it’s hard to pull myself away!"
"It drove my power hungry Abyss Phi TC headphones with complete authority, but it was still dead silent and nimble enough to amplify my easy to drive Focal Utopia headphones."
"Rarely have I come across such a wonderfully revealing amplifier that can drive many different types of headphones so darn well! The solid build construction and various controls make the $2,995 price tag seem a bit low based on the other headphone amplifiers in this market space."- Peter Pialis, Headphone.guru
"Benchmark Media Systems’ LA4 preamplifier presented an utterly realistic reproduction of what was contained on each recording I played through it -- and weak recordings stood out more than usual. The LA4’s clean, analytical abilities are unmatched by any similarly priced preamplifier I know of. The LA4’s touchscreen brings it up to date with current user interfaces, and permits functions, such as balance control and muting at the device."
"If you want a preamp that editorializes, look elsewhere."
"If, like me, you value a high-resolution, totally neutral musical performance, add a Benchmark LA4 to your system, particularly if you already own a Benchmark DAC."
- Erich Wetzel, SoundStage! Hi-Fi
"You’ll have a tough time finding a cleaner, quieter, more transparent line amplifier and headphone amplifier anywhere, at any price. I found it to be a new reference. Once I heard it, I could not live without it, so I purchased the review sample. The HPA4 deserves my highest recommendation."
"The HPA4 is the latest product from Benchmark Media Systems, an upstate New York audio manufacturer. Benchmark calls it a headphone amplifier, but it’s really two products in one, combining the LA4 Line Amplifier introduced in 2018, with a headphone amplifier. It is also based on the same THX Achromatic Audio Amplifier technology used in Benchmark’s acclaimed AHB2 power amplifier."
- Gary Galo, Audioxpress.com