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Multi-Way Conventional loudspeakers with crossovers

Amount of FIR in multi channel active Xover/DSP
Amount of FIR in multi channel active Xover/DSP
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Old 22nd May 2019, 08:35 AM   #1
Best Hi End is offline Best Hi End
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Default Amount of FIR in multi channel active Xover/DSP

I wonder whether anyone here can assist me with information regarding the amount of FIR that Ashly,Dynacord,Nova (4 channels in and 8 channels out) or other hi quality multi channel active crossover/DSP have in their abovementioned devices ?
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Old 22nd May 2019, 12:14 PM   #2
Draki is offline Draki  Macedonia
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Not sure about the exact number, but about 400-500-600 taps.
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Old 22nd May 2019, 02:44 PM   #3
mark100 is offline mark100  United States
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I think you'll have a hard time finding a high tap-count proaudio speaker management processor. Too much latency intolerance for their typical market.

On pure memory, xilica was the highest I can recall.

The installation processors such as q-sys offer quite a bit higher, you just need to build an xlr breakout panel if phoenix doesn't work for you.
I'm using q-sys at 8192 taps 48kHz
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Old 22nd May 2019, 02:54 PM   #4
1hiep0 is online now 1hiep0  United States
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Quote:
Originally Posted by Draki View Post
Not sure about the exact number, but about 400-500-600 taps.
so what is the acceptable # of tap in live application? I would assume there is a difference between home and live because of the delay.
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Old 22nd May 2019, 03:10 PM   #5
mark100 is offline mark100  United States
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Originally Posted by 1hiep0 View Post
so what is the acceptable # of tap in live application? I would assume there is a difference between home and live because of the delay.
I think 15ms works. Other than for monitors of course, where near zero latency is needed.

My 15ms estimate may be a little above consensus, but not by much I think.
Guys have been tying mains to horn loaded subs with 10ft or greater paths forever....
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Old 22nd May 2019, 03:41 PM   #6
Draki is offline Draki  Macedonia
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Quote:
Originally Posted by mark100 View Post
I think 15ms works. Other than for monitors of course, where near zero latency is needed.
^
About right. That's why the pro systems have low count taps, to keep the latency at minimum.

You may want to check Four Audio , they are applying downsampling in the lower frequencies which in turn gives high tap count.
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Old 22nd May 2019, 04:15 PM   #7
Best Hi End is offline Best Hi End
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Thanks you all for the info. It's quite frustrating to know that such a Pro Brands manufacture DSP with so few taps although I understand the difference in needs between home audio in which I'm looking for and live shows. I have heard of Four audio ,but I'm not familiar with it's qualities and I couldn't find how many taps their multi channel crossover/DSP has nor it's price !
Can anyone recommend me on multi channel crossover/DSP that has as close as possible to 64k taps for the sub,around 32k taps for the midbass,around 16k taps for the midrange and around 8k taps for the tweeters or as close as possible to the above mentioned taps ?
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Old 22nd May 2019, 04:38 PM   #8
Henckel is offline Henckel  Denmark
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The Fir Filters can be partitioned and the latency can be almost 0 ms - look up brutefir and read
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Old 22nd May 2019, 04:57 PM   #9
Draki is offline Draki  Macedonia
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Quote:
Originally Posted by Best Hi End View Post
Can anyone recommend me on multi channel crossover/DSP that has as close as possible to 64k taps for the sub,around 32k taps for the midbass,around 16k taps for the midrange and around 8k taps for the tweeters or as close as possible to the above mentioned taps ?
Possible if you use PC/software based products like Acourate or Audiolense. So the PC will be your "hardware" and you will need additional peripherals like multichannel DACs and similar.

Look up the member here Mitchba and his posts (also his blogs in the former Computer Audiophile, now Audiophilestyle). He even wrote a book about it.
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Old 22nd May 2019, 05:18 PM   #10
Draki is offline Draki  Macedonia
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Also take a look at this, will clarify somewhat (note it is 3 and a half years old and an update is overdue):

MiniDSP : Looks like OpenDRC has some new competition... (1/2)
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