My understanding that these are replacement for HFI-750, if that's the case HFI-680 should provide more balanced and detailed sound, as their response is more tuned for music, when HFI-780 for gaming and movies.
Interesting that HFI-680 and 780 have different impedance
HFI-680
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Frequency range 15-25.000 Hz
Impedance 75 Ohm
Sound pressure level 99 dB
HFI-780
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Frequency range 10-26.000 Hz
Impedance 35 Ohm
Sound pressure level 96 dB
Taking ER-4P/4S analogy, higher impedance - better details and highs and lesser bass. Wondering if impedance adapter will work to make HFI-780 into 680.
I used to own HFI-650 TrackMaster. Saint.panda's review of closed phones has a very accurate description of their sound signature.
Looks like the driver is still the same and enclosure is not that different from the original HFI, except shiny part. I can't tell by the picture if it got bigger, the old one was quite shallow for ears, the same problem as reported by UE9 owners.
BTW, mylar drivers do not need ridiculous amount of burn-in like titanium plated ones in proline series and UE9. What would be interesting is to transplant PL750/2500 drivers into new HFI enclosure, that should make them very close if not identical to UE9.
Last edited by Andrew_WOT; 02-09-2008 at 07:40 AM.
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