10 Feb
2014
10 Feb
'14
4:59 p.m.
On Mon, Feb 10, 2014 at 6:08 AM, Shani Hadiyanto Pribadi
<shanipribadi(a)gmx.net> wrote:
Now this is where I lost you, how many speakers do you
have exactly,
and how many amps for them? Doesn't it mean that you need as many amps
for each speakers you have if you ditch the speaker selector?
If indeed you want to control it like that then you also need a soundcard
with as many output channels as the number of power amps channels for
the speakers.
I currently have three pairs of speakers, and intend to add a fourth
as soon as this is all squared away (the wiring for the fourth is
already in place, I just need to connect them to speakers). The
existing three pairs of speakers are the in-ceiling speakers I've been
talking about. The fourth pair of speakers will be traditional
full-range speakers. That's one reason why I want to send the
full-range signal to the power amp (and in turn the speaker selector).
I think you might be confusing the AVR with the speaker selector; they
are two different devices. The speaker selector is a passive device
(it doesn't require external power). It simply allows an amplified,
speaker-level signal to be multiplexed. Without such a device, I
would indeed need to have a 1:1 power amp to speaker pair ratio.
Here's a concrete example of a speaker selector, Monoprice product 8229:
http://www.monoprice.com/Product?c_id=109&cp_id=10903&cs_id=1090305…
10 Feb
10 Feb
5:11 p.m.
New subject: On the fly bass downmixing to mono (mpd or alsa)?
On Mon, Feb 10, 2014 at 09:59:01AM -0600, Matt Garman wrote:
The existing three pairs of speakers are the
in-ceiling speakers I've been
talking about. The fourth pair of speakers will be traditional
full-range speakers. That's one reason why I want to send the
full-range signal to the power amp (and in turn the speaker selector).
If these in-ceiling speakers are small ones (that really need a sub)
they won't appreciate high level LF signals they can't reproduce.
In the best case this will result in distortion, in the worst you
could easily damage them.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)
5:22 p.m.
New subject: On the fly bass downmixing to mono (mpd or alsa)?
On Mon, Feb 10, 2014 at 10:11 AM, Fons Adriaensen <fons(a)linuxaudio.org> wrote:
On Mon, Feb 10, 2014 at 09:59:01AM -0600, Matt Garman
wrote:
I'll have to pull one to check and see what they are exactly. I
received no documentation.
I'm currently sending a full range signal to them and I don't hear any
obvious distortion. I guess I've always assumed they had a built-in
passive crossover network to filter out frequencies the driver can't
handle. They definitely don't reproduce low-level signals, though, as
there's definitely missing sound without the sub.
-Matt
The existing three pairs of speakers are the
in-ceiling speakers I've been
talking about. The fourth pair of speakers will be traditional
full-range speakers. That's one reason why I want to send the
full-range signal to the power amp (and in turn the speaker selector).
If these in-ceiling speakers are small ones (that really need a sub)
they won't appreciate high level LF signals they can't reproduce.
In the best case this will result in distortion, in the worst you
could easily damage them. 
10:31 p.m.
New subject: On the fly bass downmixing to mono (mpd or alsa)?
On 10 February 2014 22:59, Matt Garman <matthew.garman(a)gmail.com> wrote:
I currently have three pairs of speakers, and intend
to add a fourth
as soon as this is all squared away (the wiring for the fourth is
already in place, I just need to connect them to speakers). The
existing three pairs of speakers are the in-ceiling speakers I've been
talking about. The fourth pair of speakers will be traditional
full-range speakers. That's one reason why I want to send the
full-range signal to the power amp (and in turn the speaker selector).
I think you might be confusing the AVR with the speaker selector; they
are two different devices. The speaker selector is a passive device
(it doesn't require external power). It simply allows an amplified,
speaker-level signal to be multiplexed. Without such a device, I
would indeed need to have a 1:1 power amp to speaker pair ratio.
I thought that you wanted to control the speaker selection from linux,
and since the speaker selector is not computer controlled then the
other way to achieve
it would have been to have the channels controllable from linux.
Ah, since you have 4 output channels then the solution I provided in
my previous e-mail will
work just fine for you. (I'll link it again incase you missed it
http://alsa.opensrc.org/Low-pass_filter_for_subwoofer_channel_%28HOWTO%29 )
You will only use 3 of the channels (set it up as L, R, M), no need to
fuss with a Y-adapter then.
Although if you could use jackd as the audio output instead of alsa,
then it would be easier to just use
Fons' awesome zita-lrx to upmix the channels, with the added bonus of
a crossover.
http://kokkinizita.linuxaudio.org/linuxaudio/downloads/index.html
I would also like to second Fons' suggestion to hi-pass the signals
sent to the ceiling speakers,
you can turn off the highpass when you switch to the fullrange speakers.
Audio quality aside, sending LF to speakers that are too small to
produce them is just a waste of power.
Too much cone excursion will damage the ceiling speakers.
3737
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linux-audio-user@lists.linuxaudio.org
3 comments
3 participants
participants (3)
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Fons Adriaensen -
Matt Garman -
Shani Hadiyanto Pribadi