10 Feb
2014
10 Feb
'14
1:11 p.m.
On 10 February 2014 06:51, Matt Garman <matthew.garman(a)gmail.com> wrote:
Sure, no problem. What I have is:
(1) Linux server with a media collection in a basement network closet
(2) A powered subwoofer on the main floor, with only a single coax
run between the sub and network closet in the basement
(3) In-ceiling speakers on the main floor, all wires terminating
in same network closet
Are the in-ceiling speakers connected in pairs?
If they are then you need 3 channels, L,R,M. where M = L+R.
If you have a soundcard with at least 3 channels and insist on using
alsa output then you can use
http://alsa.opensrc.org/Low-pass_filter_for_subwoofer_channel_%28HOWTO%29
to upmix from 2 channels to 3 channels in ALSA. (you can ignore the
part about low pass).
Or you could instead use the jack mpd output plugins and just connect
the channels
like
MPD_out_L -> HW_L
-> HW_M
MPD_out_R -> HW_R
-> HW_M
There is also jackminimix for a OSC controlled mixer.
I think ecasound can also be used for that purpose.
Note that in this solution, I'm sending the
full-range signal to both
the in-ceiling speakers and the sub. The sub has a builtin crossover,
and the speakers can handle the full signal.
As a side note, if you read the AudioCircle thread above, you'll see I
already have an AVR that can send a bass signal over coax... my goal
is to get rid of the AVR though, as I have more speakers than it has
outputs (would rather not use the AVR and speaker selector), plus I
want to move control off the AVR and onto the Linux server (mpd).
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.
10 Feb
10 Feb
1:31 p.m.
On Mon, 2014-02-10 at 19:11 +0700, Shani Hadiyanto Pribadi wrote:
(you can ignore the part about low pass).
On Sun, 2014-02-09 at 21:27 +0000, Fons Adriaensen wrote:
Note that it is normally more important to remove the
bass signal for
the main speakers than to remove the mid/high part for the sub.
I have never listened to a subwoofer system that did satisfy my taste
for natural sound. At least not when I was aware about a subwoofer,
perhaps some systems were very good and I didn't notice the subwoofer.
I suspect that the subwoofer anyway only will transmit low frequencies,
but as Fons pointed out, I suspect that many systems I heard were that
bad, perhaps because they missed to filter out the bass for the mid/hi
speakers correctly.
JFTR when mixing everything to mono, IOW also for the mid/hi speakers,
than the OP might not miss the HiHat that is more to one side than to
the other, but it could happen that some effects, vocals and other
signals will be completely eliminated, especially if the OP does listen
to simple popular music, usually made by DJs. Some of those "engineers"
use out of phase effects to spread the stereo impression.
5:08 p.m.
On Mon, Feb 10, 2014 at 6:31 AM, Ralf Mardorf
<ralf.mardorf(a)rocketmail.com> wrote:
JFTR when mixing everything to mono, IOW also for the
mid/hi speakers,
than the OP might not miss the HiHat that is more to one side than to
the other, but it could happen that some effects, vocals and other
signals will be completely eliminated, especially if the OP does listen
to simple popular music, usually made by DJs. Some of those "engineers"
use out of phase effects to spread the stereo impression.
This is why I would prefer to only downmix frequencies below 150 Hz or
so. That is, preserve the upper frequencies as much as possible, and
only meddle with the frequencies the subwoofer will handle.
The existence of phase effects never occurred to me. That's an
interesting complication.
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2 comments
3 participants
participants (3)
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Matt Garman -
Ralf Mardorf -
Shani Hadiyanto Pribadi