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Perception is one thing, reality is another.Apologies for beating a dead horse but would someone please help me understand this... I am dying to figure out this whole headphone power amp'ing conundrum as I am missing something that would make sense of it all.
Forum members consistently state that the HD6XX will sound better with even more power (e.g. Schiit Magni 2)... the bass will be better... Why? How does more power (increased peak dB SPL) beyond let's say the Audioquest DFR's 14.7 mW @ 300 ohms (109.5 peak dB SPL) or even the Chord MOJO's 93.6 mW @ 300 ohms (117.5 peak dB SPL) make the HD6XX sound and perform better?
NoIf we take the Schiit Magni 2's max power output of 260 mW @ 300 ohms (which is a tremendous amount of power) we find that it is capable of driving HD6XXs to a deafening 121.9 peak dB SPL!
SPL from Power = 97.8 dB/mW SPL + 10 * LOG (260 mW) = 121.9 peak dB SPL
Is this really necessary for better sound or is it well beyond what we can actually hear and benefit from?
NoWhat I am trying to say or ask here is: why would we need anything more than 20 dB of headroom for even an extremely demanding and dynamic classical piece being listened at 85 dB with open backs or 65-75 db with closed backs???
Yes.Wouldn't anything under 105-110 peak dB SPL with less than 1%THD be more than enough to easily drive HD6XX and cover extremely demanding music pieces such as Mahler's Resurrection (Symphony No. 2)?
If your amp can deliver enough power to hit 110dB SPL, Peak, do that without distorting, and have enough gain to do that with every source you use, and have an output Z about 1/8 to 1/10 of the load, you can draw that line right there.Where would one draw the line to represent that point of diminishing returns where a pair of headphones will no longer benefit from more power... 110-115 peak dB SPL or even lower?
"More power" sometimes comes with other properties, which is why I mentioned them. Power alone won't change the sound, as you apply power as desired for volume, varying it with the volume control (of course the music varies power too). But often higher power amps have lower output impedance, and that could improve things. Mostly it's the perception that because something is supposed to sound better, and more was paid for it, then it does.So there is no supporting science that would show that more power than what is required (reasonably beyond a point of distortion or clipping) = improved sound?
Gotcha"More power" sometimes comes with other properties, which is why I mentioned them. Power alone won't change the sound, as you apply power as desired for volume, varying it with the volume control (of course the music varies power too). But often higher power amps have lower output impedance, and that could improve things. Mostly it's the perception that because something is supposed to sound better, and more was paid for it, then it does.
After almost 5 decades in audio I find there is more mythology in the field than almost any other hobby or industry. Opinions come from fully biased auditioning, and listening to others opinions. Manufacturers know this, sales people know this, and pseudo-science (or non-science) litters promo literature and the interwebs.I am not finding nor seeing real solid audio science behind what many are saying/recommending in regards to headphone amps.