soundcheck;540814 Wrote: > I am wondering if it is a good idea to take the headphone output as > reference. > As far as I have seen (within Alsa) the headphone out seems to be fired > by a Wolfson WM 8974. > The AKM DAC for the analog out has much better specs. Still I'd guess > that the SPDIF performs best, since also the AKM can't be called a > high-end performer if you look at the datasheet. > > I looked up the specs of both chips. The Wolfson chip specs are not > what I'd call impressive. It seems that they havn't put much focus on > the headphone output. > > The Wolfson is btw running 16 bit and 48khz max. (It seems that they > are running it with a 2nd jive_alsa process - AKM and SPDIF though goes > 24bit and are fired in parallel by Alsa) > > No idea if they add dither to the 16bit signal of the Wolfson after > volume control. Usually this should be done. This would change the > results even further. > > So. If measurements should be done, than SPDIF is IMO the first > choice. > > Cheers Just so we are clear - I wasn't recording the headphone audio output - I was recording the line outs but with headphones connected or not to the headphone socket and thus consuming power (or not)
Are you saying the Headphone circuit has its own DAC? - I didn't know that... -- Phil Leigh You want to see the signal path BEFORE it gets onto a CD/vinyl...it ain't what you'd call minimal... Touch(wired/XP) - TACT 2.2X (Linear PSU) + Good Vibrations S/W - MF Triplethreat(Audiocom full mods) - Linn 5103 - Aktiv 5.1 system (6x LK140's, ESPEK/TRIKAN/KATAN/SEIZMIK 10.5), Townsend Supertweeters, Blue Jeans Digital,Kimber Speaker & Chord Interconnect cables Kitchen Boom, Outdoors: SB Radio ------------------------------------------------------------------------ Phil Leigh's Profile: http://forums.slimdevices.com/member.php?userid=85 View this thread: http://forums.slimdevices.com/showthread.php?t=77908 _______________________________________________ Touch mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/touch
