Oh man... another amazing comment in the Oppo thread. A fella with a lot of technical knowledge points to three headphone frequency response charts, all with the exact same curve to within 4dB and says those all sound completely different... and then compares two cans with a 15dB difference on the whole bottom half of the frequency range and says they sound the same. When I ask him what he's looking at in the charts he posted to make those determinations, he says it's "driver loading". Now I'm no expert, but I'm guessing that means the direction the sound comes out of the driver to go into your ears. I can't imagine that throwing half the frequency spectrum off by 15dB and make three headphones with identical response sound totally different. Does anyone know just how big of an impact "driver loading" has? (in dB) I would guess it would be easy to measure with tone sweeps by ear.
Edit: OK, now they say a 15dB difference in the heart of the treble is "measuring the same". I don't understand this at all. Why even bother with specs if they don't represent the sound?
For what it's worth, now that I've seen the "officialish" frequency response chart for the Oppo PM-1s, it pretty much accurately depicts how they sound- stone flat throughout the key frequencies. The only area I'd question is their measurement of the boost at 9kHz. I showed that at 6kHz on two different sets of PM-1s, and it was about 8dB less of a boost. That's a quibble that wouldn't really affect the sound much though.
Edited by bigshot - 4/18/14 at 10:38pm