cliveb;544011 Wrote: > Yes, absolutely. As the cymbal crash dies away, the lower level detail > is no longer masked by the loud crash. Therefore you need accurate > reproduction of the lower bits to hear the subtle aspects. So we are in > agreement? Er, no... > > Let's say you're listening to a piece of music and there's a cymbal > crash peaking at 100dB SPL, then it decays. Let's be extreme about this > and say there are decay details at 4dB SPL you need to be able to hear. > (We'll ignore for the moment that your lisening room can't possibly be > quiet enough). In order to hear those details, you need a system > capable of a 96dB dynamic range (ie. a full 16 bits). The voltage of > the signal at 4dB is 1/65536th of the voltage at 100dB. If the voltage > that delivers 100dB is 10V, the voltage that gives you 4dB is 0.152mV. > > So far so good. Now turn the volume down, so the cymbal crash is at > 94dB. The voltage to generate that level is half that required for > 100dB: 5V. And so the subtle detail in the decay will now be playing at > 0.076mV, which will give an output level 6dB lower than it was before, > ie. at -2dB SPL. But hang on - you can't hear anything beneath 0dB SPL. > Those subtle details that were audible in the decay when the peak level > was 100dB are not audible when the peak level is 94dB. > > Once again: as you turn the volume down, the required dynamic range > reduces. I'm not talking about the changing levels within a track, I'm > talking about adjusting the playback level with a volume control. If 16 > bits of resolution is enough when you're listening at 100% on the volume > control, then 15 bits will be enough when it's at 50% (assuming a linear > scale for simplicity). On the other hand, if your system/ear is > wonderful enough that you need 20bits at 100%, then you'll need 19 bits > at 50%. But the principle remains the same: to retain the same amount of > audibility of fine detail, as you reduce the playback level you can > afford to lose dynamic range. (Edit - or rather: as you turn the > playback level down, you can't hear as much fine detail, so you don't > need as much dynamic range).
When you turn it down in analog your noise floor goes down with it (for the most part). When you turn it down in digital it does not !! -- 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
