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Benchmark AHB2 Review (Updated Measurements)

Rate this amplifier:

  • 1. Poor (headless panther)

    Votes: 8 2.2%
  • 2. Not terrible (postman panther)

    Votes: 7 2.0%
  • 3. Fine (happy panther)

    Votes: 50 14.0%
  • 4. Great (golfing panther)

    Votes: 293 81.8%

  • Total voters
    358
In many ways the AHB2 was a tempting choice when I started buying amps to rebuild what I had before the house fire last year. But I got the idea that it was just too much money for the performance. Not saying its not worth it in the long run, it in fact may well be. Im in a position of too few dollars chasing too many pieces of gear to buy to get back the same level of functionality I had before the fire. The value per dollar spent just wasn't there for me. I may live to rue the day I bought NC500 power amps from VTV but so far so good and Warren is great to work with. Hypex did a great job designing a black box with gain. Easily they are audibly the most transparent and effortless sounding amplifiers I have ever owned. No discernible coloration. Bravo Hypex. If they live a long time with no trouble, that will be the confirmation of a choice well made. Sadly when we buy new gear we have no clue what the reliability index is going to be partly due to the fact it is new and has no established track record. That only comes with time and then it is no longer new. Its a harsh reality that buying new means you end up being a beta tester. :) Read the story below.

Sadly I jumped into the Emotiva waters last fall and the MR1L I purchased from them is now back in their hands. The initial purchase was a factory refurbished unit. I have always had good luck with factory refurbs due to the fact they fixed (supposedly) what was wrong and recertified the unit as healthy. I did that with my last processor receiver from Yamaha. That decision was a sound one that played out well. Not so much for the Emo. My unit had taken to breaking into screeching oscillation at a high level no matter the gain setting, threatening the life of the tweeters, as well getting very loud pops thru the speakers when changing sources, or when a new clip started playing on youtube or other video source. Those pops were loud enough even when the receiver was set to very low playback levels that I feared for the life of the tweeters. Not only did their so called service department fail to find the issues when they finally allowed me to return it, at my expense,( roughly $180 bucks plus a 90 minute round trip drive to the local UPS store) to send it back. But then after expressly instructing you NOT to send accessories like remotes and the like which I could have easily done with the original shipment, their service manager Mike calls me up yesterday and tells me when I told him I did not want the receiver back unless he could guarantee I would not have those issues again that there was no way he would promise those issues would not show up again. I told him I wanted a full refund and he would not do that, the best he could offer was full store credit for the unit minus $30 for the accessories I did not return. I had followed their instructions and my reward for doing so was to have to make yet another trip to the UPS store and waste another 90 minutes or have my store credit dinged $30. I sent him an email telling him he should be ashamed of himself for requiring that when I had followed instructions explicitly. I told go ahead and ding me $30 my time and trouble is worth more than that. What I didn't tell him was that the customer service experience with them was a nightmare and that the idea of buying another processor like the one I had was a complete impossibility and further I will pass this story on at ever forum I am a member of. Those people couldnt find their ass with both hands a map. Rant over. They got me for 1200 plus 180 for shipping and a lot of wasted time writing emails. I would have been better off keeping it and selling for parts. God help the poor soul who ends up getting my refurbed unit.
 
I have had 3 benchmark DACs, my first an HDR, which I purchased about 14 years old and used it in my desk top system to feed apair of Adam A7 active speakers. Still going strong and sounding great today in my son's home studio.

If you look at Benchmark products, and the company as a whole, they complete the trifecta for me - they are competent engineers, they care, and they have plenty of energy. By the last category I mean they happliy put time and effort into advising their customers, and the audio community in general, and they are also anti-BS.

Great company, great people.
 
Mine also has a very slight pop/snap when turned on or off. I was also told by Benchmark that it's normal.
Can you share what exactly did Benchmark said about this?

Mine has a small pop when power off. An annoying nuance for sure.
 
I might be dreaming but I had the click and somehow got rid of it. I think it was when I got 2x and bridged them - dead silent on power off.
 
Right, that was my experience. Running the amp in mono: no click. Running it in stereo: tiny click.
clicks imo aren't acceptable in a 3k amp. they impact my enjoyment more than a 5dB difference in SINAD once you break into the 90s.
 
clicks imo aren't acceptable in a 3k amp. they impact my enjoyment more than a 5dB difference in SINAD once you break into the 90s.
I have 5 AHB2s and find the soft tick on power-off acceptable. The tick sound is accompanied by the relay clicks. Really, not a big deal.

These amps are now 6 years old, still SOA and reliable.

- Rich
 
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That tiny pop when powering off, can be a nuance, yes. To me it's not a terrible big deal, even for a $3,500 amp, given what you get from this amp.

The most important thing is to make sure it's not a batch/lot of defective products and based on what I am reading here, doesn't seem like it at all rather a minor "design flaw" if you will. As such, I am going to put this lingering concern to bed.
 
Small "thumps" on startup are very hard to disappear, really. Capacitors must be charged to their intended voltage somehow.
 
Small "thumps" on startup are very hard to disappear, really. Capacitors must be charged to their intended voltage somehow.
In this case, there is a small tick on power off.

- Rich
 
In this case, there is a small tick on power off.

- Rich
I think they could of designed it such that the time between the mute relay switch to the power off be longer, maybe one extra second. That may have solve the issue.

But not biggie.
 
I think they could of designed it such that the time between the mute relay switch to the power off be longer, maybe one extra second. That may have solve the issue.

But not biggie.
Some people do not have this issue, that could be due to using the amp in mono mode or a small design change in newer units.

Yep, not a biggie.

- Rich
 
I haven't listened to the noise in question, so can't offer a real opinion. A mechanical click when turning a device on I can perfectly live with. An audible "pop!" doesn't seem appropriate in a premium device.
I had an AHB2 for a while, I never heard it make a sound. And with an idle power consumption of 20W and standby of 0.5W, I am not sure I'd bother to turn it on and off. One of the Class D (although I know the AHB2 claims a different category for itself) benefits, IMO.
:)
 
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I haven't listen to the noise in question, so can't offer a real opinion. A mechanical click when turning a device on I can perfectly live with. An audible "pop!" doesn't seem appropriate in a premium device.
I had an AHB2 for a while, I never heard it make a sound. And with an idle power consumption of 20W and standby of 0.5W, I am not sure I'd bother to turn it on and off. One of the Class D (although I know the AHB2 claims a different category for itself) benefits, IMO.
:)

Modern Class D amplifiers are remarkably good. Furthermore, one of the things about delta-sigma and pwm is that both of them are pretty much immune to "center clippling" by their very nature, as well as having the distortion grow more rapidly near max, almost (but not quite) like a classic 6L6GTB amplifier.
 
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