krzys;223930 Wrote: > Sean, I understand you very clearly, the theoretical point is there. As > I said max level, no replaygain and no processing. But when I feed my > system from the PC sound card or from cd player used as transport > playing the same file, the level is higher than from the SB. > Is it possible that my SB has some defect in the SPDIF ? > Until now no other member has reported such a problem ? > Chris
Chris, sorry but no, it is not possible for a "defect in the SPDIF" to cause lower volume. The only thing that can cause lower volume is mathematical manipulation of the signal, i.e. a volume control of some kind. There are a few tests you can do to confirm that the s/pdif signal level is correct. First, you can use Squeezebox's built-in sine test to generate a full-scale sine wave. To run the test, power cycle the Squeezebox (or press and hold power) and then on the splash screen press '3'. (make sure you amp is down and/or speakers unplugged). Then measure the output of your DAC (AC volts) with a multimeter. It should equal the max RMS output level spec for the DAC. Usually this is 2V rms. If your DAC specific peak-to-peak instead of RMS, multiply the reading on your meter by 2*√2 to convert to pk-pk. However, be aware that this test assumes that the DAC is behaving correctly and that its listed specification is correct. A better test is to inspect the data that is coming out of the s/pdif port. To do this you will need a PC sound card that can take a digital input. Record the output from the squeezebox and then look at the data using either an audio editing program or if you're feeling brave, a hex editor. Record the output from your CD player in the same way and you can then compare side by side. Please understand I am not saying that there is no way your Squeezebox could sound quieter. What I'm saying is that if it really is quieter, it's because of some volume control in the chain, not a defect. -- seanadams ------------------------------------------------------------------------ seanadams's Profile: http://forums.slimdevices.com/member.php?userid=3 View this thread: http://forums.slimdevices.com/showthread.php?t=38024 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
