"Scott" wrote in message
On May 5, 5:35 pm, "Arny Krueger"
wrote:
I can say with pretty fair authority that the Frequency
Range spec is patently false if you presume +/- 0.1 dB
flatness or +/- 1 dB flatness or +/- 3 dB flatness and
is iffy even if you allow a +/- 10 dB flatness.
No I think the frequency range is actually pretty spot
on. There is no need to make any false presumptions.
While the Grados are pretty flat compared to just about
any loudspeaker and they are phase coherant being single
transducers they are not *that* flat.
Given the reflective environment that headphones work in, any presumed phase
coherence is moot by the time the music hits the ear canal. And, if you are
up on your psychoacoustical readings, you know that ears have only a passing
relationship with phase coherence, and its all past by 1 KHz.
But they are
certainly well under +/- 10db within 20hz-20khz.
Authority:
http://www.headphone.com/headphones/grado-sr-60i.php
Which isn't that much diferent from what I cited in my first efforts to
correct Scott in a previous post:
http://www.headphoneinfo.com/content...nes-Review-235...
Fact is Scott, there are any number of speakers whose on-axis response is
far better within the far more critical 80 Hz-12 KHz range. Fixing the huge
roll-off below 50 Hz is what good subwoofers do. I'd like to see what a
subwoofer for a pair of headphones looks like! ;-)