On Wed, 24 Dec 2014 08:55:38 +1000 David Seikel <onef...@gmail.com> said:

> BTW John, DAC stands for Digital to Analogue Converter.  Any computer
> sound has to go through a DAC to produce analogue sound.  Your ears are
> analogue, and can't accept a digital signal.  So DACs aren't anything
> special.  Motherboard sound uses DACs, as does any USB sound device.
> 
> On Tue, 23 Dec 2014 17:25:14 -0500 mh <mhe...@member.fsf.org> wrote:
> 
> > Looks like a nice player :) I think the optical out is a digital
> > signal. As far as the difference in sound with my external dac, to be
> > honest it's hard to say. I'd like to think that it would sound better
> > than the dac included on the computer main board. I think it sounds
> > better, but to say for sure you'd need to do some A-B-X testing I
> > suppose. I'm happy with the setup though. I really needed the O2 amp
> > to drive the Beyer headphones, even though they are 250 ohm, not the
> > 600 ohm.
> 
> Typical sound on motherboards doesn't shield the analogue side of
> things from all the electrical noise inside the computer.  So it's
> usual to hear a variety of horrid little sounds, clicks, buzzes, pops,
> if you listen carefully to typical motherboard sound.  Typical USB
> based sound is outside of the computer, and thus tend to be shielded
> enough to not pick up all that noise.  Try listening to silence or
> quiet tracks with headphones.  YMMV

maybe i have just gotten lucky machine after machine year after year... or you
have just been unlucky... but i have never had unshielded analogue lines on any
pc or laptop i have had. never heard a buzz or clicks, bings, beeps, clicks,
ticks or anything. indeed you are right - unshielded analogue lines will indeed
inherit interference from general electric signals from the motherboard - but
i've never heard it...

i HAVE heard it from a phone if near enough to the headphone or speaker cables
in the past. though that seems to have stopped these days of glorious lte-a :)

> > I also have the eMixer working, sitting on my shelf :) It works 
> > perfectly! I haven't tried any of the other settings, just using the 
> > master channel.
> > 
> > 
> > On 12/23/2014 03:23 PM, John Holland wrote:
> > > I have a fiio X3 but I've only used it as a portable music player.
> > > It says it can be a dac though. Is an optical audio signal digital
> > > data or analog? Do you perceive the difference in sound from using
> > > the dac?
> > >
> > > Also you know I was able to get the enlightenment mixer to work
> > > with Alsa by installing libasound2-dev before compiling e.
> > >
> > > On December 23, 2014 3:10:57 PM EST, mh <mhe...@member.fsf.org>
> > > wrote:
> > >> I plug the dac into the front usb port, then dac output into the
> > >> amp. To
> > >> play cds or music files, I usually use Audacious. Connect the dac
> > >> first,
> > >> then start Audacious. Then, set Audacious pcm device setting for
> > >> the dac, use the default mixer device.
> > >>
> > >> For system audio, like Firefox, youtube etc, there is the
> > >> /etc/asound.conf file. In it there are two lines that identify the
> > >> default audio card to use. Normal system default is 0, my dac is 3:
> > >>
> > >> defaults.ctl.card 3
> > >> defaults.pcm.card 3
> > >>
> > >> As I plug and unplug the dac it will change from 0 to 3 and back
> > >> and the
> > >> system audio will change from the computer speakers to the the dac.
> > >>
> > >>
> > >> On 12/23/2014 02:01 PM, John Holland wrote:
> > >>> Is that something that is built into a desktop?
> > >>>
> > >>> On December 23, 2014 11:00:49 AM EST, mh <mhe...@member.fsf.org>
> > >> wrote:
> > >>>> I have a JDS Labs ObjectiveDAC and pair it with the JDS
> > >>>> Objective2 headphone amp. Beyer DT990 phones.
> > >>>>
> > >>>>
> > >>>> On 12/23/2014 10:54 AM, John Holland wrote:
> > >>>>> What do you use for a dac?
> > >>>>>
> > >>>>> On December 23, 2014 9:52:08 AM EST, mh <mhe...@member.fsf.org>
> > >>>> wrote:
> > >>>>>> On 12/23/2014 09:12 AM, marcel-hollerb...@t-online.de wrote:
> > >>>>>>> Hi!
> > >>>>>>>
> > >>>>>>> On Tue, Dec 23, 2014 at 10:59:40PM +0900, Carsten Haitzler
> > >>>>>>> wrote:
> > >>>>>>>> On Tue, 23 Dec 2014 08:54:38 -0500 mh<mhe...@member.fsf.org>
> > >>>> said:
> > >>>>>>>>> On 12/23/2014 01:11 AM, Pierre Couderc wrote:
> > >>>>>>>>>> Le 23/12/2014 00:19, Carsten Haitzler (The Rasterman) a
> > >>>>>>>>>> écrit
> > >> :
> > >>>>>>>>>>> likely alsa will get dropped and current mixer replaced by
> > >>>>>> epulse.
> > >>>>>>>>>> Fine !
> > >>>>>>>>>>
> > >>>>>>>>> sorry to hear that!
> > >>>>>>>> mixer isnt in great shape, and alsa is definitely less used
> > >>>>>>>> than
> > >>>>>> pulse. and
> > >>>>>>>> epulse is very solid and working well - so less bugs. it is
> > >>>>>>>> far
> > >>>> more
> > >>>>>> fully
> > >>>>>>>> featured.
> > >>>>>>>>
> > >>>>>>>> if people have a problem with this, then it may be an idea to
> > >> get
> > >>>> up
> > >>>>>> and get
> > >>>>>>>> your hands dirty. :)
> > >>>>>>>>
> > >>>>>>> There is a abstraction layer for backends in epulse, and as
> > >>>>>>> far
> > >> as
> > >>>> I
> > >>>>>>> know there is a alsa backend, currently it is in a branch,
> > >>>>>>> but it
> > >>>>>> works,
> > >>>>>>> I run it a long time :)
> > >>>>
> > >> ------------------------------------------------------------------------------
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> 
> -- 
> A big old stinking pile of genius that no one wants
> coz there are too many silver coated monkeys in the world.
> 
> ------------------------------------------------------------------------------
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> hub for all things parallel software development, from weekly thought
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-- 
------------- Codito, ergo sum - "I code, therefore I am" --------------
The Rasterman (Carsten Haitzler)    ras...@rasterman.com


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