Wow lot posts since I last checked this thread. Folks I'm well aware of Practice vs Theory.
The point of the test is to check *ROUGHLY* what your limit is. I was actually surprised I could easily hear 18bits or more (GRANTED at full analog volume). Also keep in mind when you use digital attenuation your shifting EVERY bit down into a worse performing range. So in "Practice" it's actually worse than this very simple signal. Sorry on the mix up on 440Hz vs 3.5K. I had two sets and mixed the first two up. It's not that big a deal because I expect most will get past the first two test files and the rest are consistent labeled correctly. When I did my testing I bypassed my digital Preamp for those questioning what Meridian is doing. I tested with Meridian DSP speakers that don't upsample. It's basically a DAC/Preamp/Amp/Speaker all in one box. I've convinced a bunch of Meridian owners to reconfigure their preamp to basically run full scale and not let the processor attenuate even one 1/2 a single bit (3dB). 21 folks say it sounds better 0 say it has no change. This was effectively removing rough 3-6dB of digital attenuation. Then I dug into why this is so and why 24bit doesn't avoid problems with digital attenuation. Will you hear the difference attenuating Lady Gaga digitally, probably not. Digital Attenuation is BAD BAD BAD BAD even just a little is BAD. This test is only part of it. It was mainly to show you can't hear 24bits from your DAC even in UNREASLISTIC extreme cases but you can easily hear over 16bits. They say human hearing has 120dB dynamic range. Another test I may do is take a nice delicate classical piece of music and stuff noise in bits 17-24, then 18-24, then 18-24. I'll bet you can easily hear it even at normal levels past 16bits. This will be a more realistic test. I used Audacity to generate the test files. But I would like to make a cleaner set they are a little rough but they got the job done. -- mswlogo XP > Cat5 > Transporter/DuetController > SPDIF > Meridian G68 > DSP6000, DSP5500HC, DSP5000 XP > Cat5 > SB3 > SPDIF > Meridian DSP5000 XP > Cat5 > DuetReceiver > SPDIF > Meridian G91 > DSP5000 'My Transporter Setup' (http://forums.slimdevices.com/showpost.php?p=350741&postcount=45) 'Hitch Hikers Guide to Meridian' (http://www.meridianunplugged.com) ------------------------------------------------------------------------ mswlogo's Profile: http://forums.slimdevices.com/member.php?userid=9090 View this thread: http://forums.slimdevices.com/showthread.php?t=77725 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
