I didn’t find a specific thread related to the AHB2 so I thought I would create one. Even though it’s a power amplifier and not a headphone amp, I’ve met many people who have started using this as their solid state amplifier of choice for the Susvara and other headphones.
Based on my experience, the AHB2 can power both Susvara and IEMs without any hiss. It presents a neutral, matter of fact sound signature that can reveal the weaknesses in your chain. It won’t enhance or color the headphone in any way which could be seen as a good thing or bad thing. Bass is grippy, nothing is overemphasized, and mids sound natural.
One thing that many people are concerned about is the THX certification that it has. I know the THX789 has created a pretty bad rep for THX but the AHB2 isn’t gimped when it comes to the amount of current and power it and provide. If you’re looking for a warm or 2nd harmonic adding amplifier, something like a Pass Labs would probably make more sense.
I was very impressed by the footprint, power, sound quality, and flexibility that the AHB2 provided. If someone is looking for something that can power both headphones and speakers (with a couple more boxes), the AHB2 is definitely an amp that should be on your short list.