linuxaudio.org

On Tue, 2010-08-03 at 20:17 +0200, Jörn Nettingsmeier wrote:

quoted text
> On 08/03/2010 07:45 PM, Fernando Lopez-Lezcano 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.

>

> it does :) except you'd usually throw away z, 

Yes, of course, that was my mistake - I don't have subs in the ceiling

or floor (yet :-)
> > What if you want to include a crossover? (that's exactly what I'm

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> > 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?

>

> hmm, i think i would rely on the internal electronics of the tops for

> the HPF and feed them a full-range signal of all components, and then

> maybe measure one and design a suitable roll-off for the bass

> speakers... but i have never had the luxury to do that, i always set the

> LPF by ear.

I currently have 8 Mackie 824's at ear level, 4 624's in the ceiling and

4 624's below the floor (and I will add two more 624's, one zenith, one

nadir). So their frequency responses don't exactly match in the low

end. 
Right now I'm writing a software crossover with HPF / LPF sc ugens

(12dB/oct butterworths). 
> sending high-passed WXYZ and full-range higher orders to the tops won't

quoted text
> work well, i guess. if you want to take care of the band-splitting in

> your mixer, your best bet would be ganged high/low-pass filters for all

> the orders. 

That is what I'm currently trying. I still don't have a clear idea of

what would be best - or even reasonable - in terms of high order

components (at this point in time I only have 2 subs so I'm sending them

just W, but the code supports 4 and I plan to have that setup soon, at

least for testing). Fons?
-- Fernando
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