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Artismo
441
Nov 6, 2019
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As in true dual mono? No, I believe the engineer covered this in the discussion, but if IIRC, according to him, the performance difference is negligible or non-existent.
Nov 6, 2019
kromie
0
May 7, 2020
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I was sort of disappointed with power for driving my Sennheiser HD650s, using the SE output 1/4 plug. I had to use level 3 gain, and crank up the volume to get sufficient volume through the headphone. So I bought a Sennheiser brand balanced headphone cable for the Sennheiser, that mates to the balanced plug out on the THX AA 789. I haven't tried it yet, still waiting for delivery. But my understanding is it will provide 3.5 watts output, compared to the SE output of 1.5 watts. I don't know if higher wattage will produce greater output, or just more dynamic range, etc. I don't really listen that loud, but at the 3 o'clock position (maybe 80 percent volume knob rotation), the amp doesn't impress me. It would be much better with higher efficiency headphones, so just my experience with the Sennheisers.
May 7, 2020
Artismo
441
May 8, 2020
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SET at 300ohm it will not be 1.5w. The spec sheet states 100mw at <1% THD, less if you want less distortion. It is also widely known that the SET output is the weakest feature of the 789, with the Atom providing more power. The HD650 is 103dB/v SPL converted to 97.7dB/mw SPL. At 300ohm, it would only require 2 milliwatts, 0.77 volts, and 2.6 milliamps to reach 100db at 1kHz. That’s about the same loudness as being 1 meter away from a speaker at a night club. Even at Gain 3, the 789 should have no problem powering the HD650 to piercing and damaging levels to both you and the headphones.
May 8, 2020
Lmvrtinez
46
Jan 4, 2021
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Seems like your issue is your DAC Vrms feeding into your Amp. Originally I had this from my PC and I was also at gain 3, 12 o clock. However when I got an external DAC that feeds 2.1 VRM fixed into this amp, I no longer can go past gain 2 on my sennheiser hd 6xx
Jan 4, 2021
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