chongky
Head-Fier
- Joined
- Sep 27, 2014
- Posts
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Ever since I started this hobby I find there's a discrepancy between what is supposedly "neutral" and what is "warm, inviting and musical" sound. Almost everyone (let's be honest) prefers a warm sound and finds them more involving and fun than a cold, analytical, "neutral" sound. It was after I purchased a ODAC/O2 combo that I started to think more deeply about this question.
Technically, ODAC/O2 cannot be faulted. Ruler-flat frequency range within the audible range, great signal-to-noise ratio and VERY transparent. However, when I pair it up with a neutral pairs of cans like Soundmagic HP150, the effect is nice but a little dull. The mids are thin and emaciated, and although soundstage and imaging are good, it seems to vindicate the notion that "neutral" is boring.
Another neutral and supposedly "unmusical" pair of cans oft criticized by detractors is the Sennheiser HD800. Possibly the most resolving dynamic headphones around, but once paired with the O2 amp, they seem to highlight mutual weakness instead of complementing each other.
I often listen to classical music and it was only after purchasing a warmish pair of cans - the Philips Fidelio X2 - that I begin to engage more with the music. I've been thinking about this and would like to propose a hypothesis and an experiment to see if my hypothesis is correct.
How comes the science part.
I strongly suspect this thinness has to do with interaural time delay. Both O2 amp and HD800 are so revealing that this shortcoming at the source is ruthlessly exposed. The sources for this are http://www.ambisonic.net/pdf/hiresaudio.pdf and http://www.jamminpower.com/PDF/New%20Audio%20Formats.pdf. To quote:
"If you put a pulse into one ear, then a pulse slightly delayed into the other ear, most people can hear a time delay of 15 microseconds or more. Under some circumstances, some people can hear time delays of 3 to 5 microseconds. Note that one sample at 48Khz is 20.833 microseconds. At 96Khz, it is 10.4167 microseconds. The minimal inter-aural (across the two ears) time delay that most people can hear is less than one sample period at 48Khz.
"When listening with both ears, everyone can distinguish 96Khz recordings from 48Khz recordings, and everyone prefers the 96Khz recordings...the reason being probably because some time-domain resolution between the left and right ear signals is more accurately preserved at 96Khz."
My instinct about this is just gut. At the risk of being ridiculed (for I'm no science guy, no engineer), I'm feeling curious enough. I am hoping someone would take the challenge and see whether this hypothesis might be correct.
A warm pair of cans does "smear" the audibility of these interaural delays inherent in CDs (16-bit/44.1 Khz) so it becomes less offensive. I also suspect Charles Hansen of Ayre Audio has stumbled on something like this as his DACs upsample single-pass 16x oversampling. And this may be the same reason why DSD sounds good (although technically inferior to PCM) - some time-domain resolution is preserved better at higher sampling rates.
If my hypthesis is correct, then oversampling a CD quality file to 352.8 Khz would (somewhat) resolve this problem. (192 Khz - 5.208 microseconds; 353 Khz - 2.104 microseconds.)
My proposed experiment:
Take the HD800 and O2 amp, pair them together with a DAC with 352.8 Khz decoding capability. Using a software upsample a CD-source FLAC file to 352.8 Khz and listen to them. If my hypothesis is correct, the sound might become fuller, more analog owing to the fact that inter-aural time delay is drastically diminished.
I understand someone on the Science forum has done a blind test for DXD/CD on loudspeakers and can't distinguish them, but interaural time delays are most noticeable on headphones. For me, I don't have a DAC which upsamples to 352.8 Khz, neither do I own a HD800, so I can't conduct this experiment. I'm just curious to see if my proposal works.
Pardon my bad English.
Technically, ODAC/O2 cannot be faulted. Ruler-flat frequency range within the audible range, great signal-to-noise ratio and VERY transparent. However, when I pair it up with a neutral pairs of cans like Soundmagic HP150, the effect is nice but a little dull. The mids are thin and emaciated, and although soundstage and imaging are good, it seems to vindicate the notion that "neutral" is boring.
Another neutral and supposedly "unmusical" pair of cans oft criticized by detractors is the Sennheiser HD800. Possibly the most resolving dynamic headphones around, but once paired with the O2 amp, they seem to highlight mutual weakness instead of complementing each other.
I often listen to classical music and it was only after purchasing a warmish pair of cans - the Philips Fidelio X2 - that I begin to engage more with the music. I've been thinking about this and would like to propose a hypothesis and an experiment to see if my hypothesis is correct.
How comes the science part.
I strongly suspect this thinness has to do with interaural time delay. Both O2 amp and HD800 are so revealing that this shortcoming at the source is ruthlessly exposed. The sources for this are http://www.ambisonic.net/pdf/hiresaudio.pdf and http://www.jamminpower.com/PDF/New%20Audio%20Formats.pdf. To quote:
"If you put a pulse into one ear, then a pulse slightly delayed into the other ear, most people can hear a time delay of 15 microseconds or more. Under some circumstances, some people can hear time delays of 3 to 5 microseconds. Note that one sample at 48Khz is 20.833 microseconds. At 96Khz, it is 10.4167 microseconds. The minimal inter-aural (across the two ears) time delay that most people can hear is less than one sample period at 48Khz.
"When listening with both ears, everyone can distinguish 96Khz recordings from 48Khz recordings, and everyone prefers the 96Khz recordings...the reason being probably because some time-domain resolution between the left and right ear signals is more accurately preserved at 96Khz."
My instinct about this is just gut. At the risk of being ridiculed (for I'm no science guy, no engineer), I'm feeling curious enough. I am hoping someone would take the challenge and see whether this hypothesis might be correct.
A warm pair of cans does "smear" the audibility of these interaural delays inherent in CDs (16-bit/44.1 Khz) so it becomes less offensive. I also suspect Charles Hansen of Ayre Audio has stumbled on something like this as his DACs upsample single-pass 16x oversampling. And this may be the same reason why DSD sounds good (although technically inferior to PCM) - some time-domain resolution is preserved better at higher sampling rates.
If my hypthesis is correct, then oversampling a CD quality file to 352.8 Khz would (somewhat) resolve this problem. (192 Khz - 5.208 microseconds; 353 Khz - 2.104 microseconds.)
My proposed experiment:
Take the HD800 and O2 amp, pair them together with a DAC with 352.8 Khz decoding capability. Using a software upsample a CD-source FLAC file to 352.8 Khz and listen to them. If my hypothesis is correct, the sound might become fuller, more analog owing to the fact that inter-aural time delay is drastically diminished.
I understand someone on the Science forum has done a blind test for DXD/CD on loudspeakers and can't distinguish them, but interaural time delays are most noticeable on headphones. For me, I don't have a DAC which upsamples to 352.8 Khz, neither do I own a HD800, so I can't conduct this experiment. I'm just curious to see if my proposal works.
Pardon my bad English.