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This has long been sold

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Price drop. Amp: $2,400 DAC: $1,300 Both: $3,500

I just don't have a need for 'em since I no longer sit around at home listening through high-end headphones (which I've sold as well).

Do it. You know you want to. I just plugged 'em in and while the noise floor is quite low, I can clearly here it whispering, "Maaaaaaaartin.... Martiiiiiiiiiiiin..."

Benchmark HPA4 Headphone / Line Amplifier: $2,500 Mint condition Used for about 10 hours Works perfectly Includes power cable and original packaging Benchmark DAC3B: $1,400 Mint condition Used for about 10 hours Works perfectly Includes power cable and original packaging Package Price...

New photo time :) This is at Sonoma Raceway.

Cool. I don't even know why they have XLR output on this thing. It's not a DAC. I mean, it has a built-in DAC. But nobody is buying this thing to use as a DAC. It's a headphone amp. I've never actually used the XLR outs on the back. Just the XLR4, 4.4mm, and 1/4" on the front.

How are you measuring this? Like... something plugged into a headphone jack? Something in an XLR jack on the back? If it's noise introduced by your test, that's certainly something to track down ;)

Yeah. I bought it before I knew what all the other options out there were. I bought the HD820 and was looking for an amp and figured hey... Sennheiser says they "designed" this amp to pair with these headphones. I live in SF, where there is a Sennheiser store. And got to demo this combo together...

Yes. They are two different things. That is exactly my point, thanks for reiterating it for me. :)

I'm not a die-hard measurements mean nothing type. But as I said earlier, I've been using this amp for months and it sounds fine to me. Without these measurements I never would have known... Maybe I have bad ears. Maybe the bad performance isn't audible. Maybe this. Maybe that.

The HDV820 manual implies (never outright states) the output impedance is 16 ohms.

For those saying this unit is broken and should be sent in for repair, I will certainly contact Sennheiser. However I've never heard any issues with it... Maybe something broke in shipping for testing?

This is my unit. While the test results are surprising all I can say is it still sounds good lol. I've had it for about six months and compared it side-by-side with a few other amps including the Benchmark HPA4, Aune S7 Pro, Sony TA-ZH1ES, THX 789, and a few others. Headphones have been Sony...

sold

Mint condition. Works perfectly. Includes power adapter and original documentation. $400 Buyer pays shipping Add 3% for PayPal if you choose to use it. Other forms of payment accepted.

Is crossfeed similar to BS2B?

Or one could just tighten the set screw? Or maybe Violectric can just put some Loctite on it. Or even a very thin bit of heat shrink on the pot's shaft to give the set screw something to grab. Doesn't require a total re-design of a knob lol.

Have put about 18 hours on the HPA4 and THX 789 now. Using DAC3-B. They sound great. No complaints other than price. 789 and HPA4 sound very close. 789 is sliiiiightly brighter/snappier on the attack of bass and drums. HPA4 is sliiiiiightly thicker/deeper overall. But this is me really...