Angel II
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- Sep 11, 2021
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Thank you for your description, you have been very thorough. The HD 650 (2013) is not a ringing headphone and I really like this feature. I usually listen with the equalizer and I don't like to accentuate the highs too much anyway. In this weekend I tried the Sabaj A10h (neutral) and I was incredibly surprised, I absolutely never imagined compatibility with an HD 650. The volume was more than enough for a good listening .. incredible because this test was not designed for HD 650.Here is what I can tell you, Angel II. My 250-ohm DT-770 has an efficiency or sensitivity (I can never remember which is which, so I just give both to avoid the confusion) of about 94.5 dB/mW or 100.5 dB/V. Whereas the Senn HD650 is about 100.5 dB/mW or 105 dB/V. These figures are from RAA.
It probably depends on how loud you like to play your music. But this should mean that the HD650 needs a somewhat less powerful amp than my 250 ohm DT-770 needs to reach the same volume. Based on that, I think the HA543 might have sufficient power to drive the HD650. The HD650 is quite a popular headphone with alot of audiophiles, so I would be surprised if the folks at Rolls/Bellari did not do test drive this with the HA543.
Whether you'll like its sound though on the HD650 is another question. Because the HA543 was designed (I think) primarily for accuracy and studio use. And its low impedance (<1 ohm) solid state amp stays pretty dang flat, regardless of what you throw at it. So it probably won't give the same sense of warmth that, for example, a higher impedance tube might with certain kinds of headphones, including some Senns.
The bottom line is that if your headphones are on the brighter or shriller side, you are probably gonna hear it with this amp. Although I haven't tried it with a wide variety headphones, based on my experience with the DT-770, I suspect it is very unforgiving in that respect. I wanted something that would be as flat and uncolored as possible though for my gear. So I could tell more easily where the flaws were in different headphones. And it seems to do the job on that.
The amp is not balanced all the way though btw. I think you'd have to shell out a bit more $$ to get a decent balanced amp. It will accept balanced XLR inputs. But it does not have a balance headphone output. Since I don't have any headphones with balanced cables, this doesn't matter to me.
There is also an "Enhance" feature on the HA543, which seems to boost the bass and treble relative to the mids. But I don't use that because it distorts the frequency response too much imo. (And the DT-770 certainly doesn't need any more help in the treble department).
The main draws on the HA543 for me were it's XLR inputs, power, flat response, low price, and it's fairly durable construction. I was a little disappointed with it's rather small size at first. And wish it were a little bigger and heavier, and would stay put a little better. But aside from that, it has done a very good job.
I can't remember if Bellari makes a tube amp for headphones. But I know they have some preamps as well. If you ask for the tech support guy at Rolls, he should be able to answer most of your questions about the Bellari line. I've always found him pretty helpful.