22 Aug
2010
22 Aug
'10
7:09 p.m.
On Tue, 2010-08-03 at 10:45 -0700, Fernando Lopez-Lezcano wrote:
On Sun, 2010-08-01 at 13:39 +0200, Jörn Nettingsmeier
wrote:
Perhpas i missed something further down in this discussion, but what
would be the deficit to letting an outboard crossover (like the ones in
the subs) handle the passing vlf instead of setting up ambdec to do it?
On 07/31/2010 11:14 PM, "Bearcat M.
Şandor" wrote:
Hmmm, so, you send WXYZ to the four subs and whatever order you can
decode to the regular speakers (6, 8, etc). Sounds good.
What if you want to include a crossover? (that's exactly what I'm
working on right now in the openmixer software).
So, you high pass WXYZ and send that to the regular speakers, low pass
WXYZ and send that to the subs... and what do you do with the rest of
the Ambisonics components? I imagine I would just send the full
frequency range to the regular speakers and let them do the best they
can, right?
-- Fernando
I am planning on subs that have their own
low-pass filters. I have a
pair of Anthony Gallo Reference 3.1s but for this ambisonics set up, i'd
get 4 pairs of the Anthony Gallo Stradas and 4 T3 subs. stradas:
http://www.roundsound.com/reference-strada.htm t3:
http://www.roundsound.com/tr-3-subwoofers.htm Most of the stuff on
those pages is marketing of course, but the satellites have a range of
45 Hz - 20 Khz +- 3 db and the subs go down to 22 Hz (no variance given).
That push-pull idea sounds fantastic. I would love it if you'd show me
how to create a set up for a system like that using ambdec, if you have
the inclination and the time. That's what i was planning on using anyhow.
basically, you take fons' example for the octagon, set the speakers up
at the correct angles and then enter the actual distances into the
matrix, so that delay and near-field compensation is correct for your
setup. then you take the example square for the subs, set them into the
corners of the room and again enter the correct distances.
at this point you have two ambdec instances running, one for the tops,
one for the subs. you'd need to adjust the relative loudness with
ambdec's faders. once you've determined the correct relative levels, you
can factor them into the matrix coefficients of the sub decoder and run
both ambdecs at 0dB. now you can hack both matrices into one and end up
with a 12 channel ambdec configuration: 8 tops and four subs. easier to
start up in daily use.