Originally Posted by Donald North
To the OP: The HD650 are 300 ohm impedance and sound better balanced when driven by an amp with 120 ohm output impedance, per the IEC 61938 spec. Grados are much lower impedance, 32 ohm, and prefer to be driven by a low impedance.
Mr North, I really dislike when someone like you that has a line of products "Donald North Audio" DNA Donald North Audio on-wall speakers on wall mount speakers bookshelf speakers high efficiency point source dipole loudspeakers vacuum tube SET triode headphone amplifier
and an economical interest behind, spits something like "sound better balanced" without giving further explanation. Very little people, not my case, know what the IEC 61938 spec is, and for some who won't bother searching for it will just sound intelligent and will suffice for them. For other people it is not enough
This is the sound science forum, and as such an explanation is always welcome/expected -in most cases-.
From what I know, that comes from a *Mechanical or Electrical Engineer (that has been working on DRC systems and much more -don't know his personal life-), the only "benefit" from going balanced is "doubling available voltage winning 6dB of power
". (Which for headphones is not needed, he adds). He speaks about the term "Bridged amplifiers" as seen here:Bridged and paralleled amplifiers - Wikipedia, the free encyclopedia
To me it makes a lot of sense that some people believe that "balanced configuration" sounds better, because it sounds louder...
Edit: It makes much more sense after you see some comments like haloxt, previous comments from blueyez, etc and all the data that backs up the rest of the "myths" from audio. I might be wrong, he might be wrong, but a lot of things point that he is not...
Something like that is what would have been nice from you to write, Donald North. No hard feelings.
* Don't know how his studies are exactly called in english but his knowledge is quite wide.