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Multi-Way Conventional loudspeakers with crossovers

DIY PMC MB2 clone
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Old 7th September 2017, 12:05 PM   #61
Charles Darwin is offline Charles Darwin  United Kingdom
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Music production so latency is a serious consideration/problem.
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Old 8th September 2017, 06:38 AM   #62
WalterPPK is offline WalterPPK  Netherlands
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Thanks Charles.

The delay in samples of the filter is (N−1)/2. So when you use all the 9600 available taps this should be 4800. at 48kHz this will result in a 100ms delay
For direct recording monitoring this is unacceptable.


The latency of the minidsp should be kept below +/-5 ms. So in 96kHz mode that means a maximum of 1000 taps. I don't know what is possible with that many taps?
I could make a FIR preset and a "non FIR" when we want lower latency.

Last edited by WalterPPK; 8th September 2017 at 06:44 AM.
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Old 8th September 2017, 08:12 AM   #63
phase_accurate is offline phase_accurate
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You will not have to use all of the available filter taps. And when you process more than one channel at once the amount of filter taps is distributed amongst those channels anyway, shrinking the achievable delay even further. I think that you can use both, IIR and FIR, at the same time (don't know what is supported by the Mini DSP GUI). That means that you are able to use IIR EQs and do just the crossover with FIR. Using a FIR crossover with a delay around just a few ms could give quite steep slopes at an xover frequency of 600 Hz for instance.
As already mentioned the AD and DA converters do also cause some small delay due to the use of FIR filters for decimation.

Regards

Charles
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Old 8th September 2017, 11:39 AM   #64
WalterPPK is offline WalterPPK  Netherlands
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Do you think using FIR crossovers will be a big improvement over IIR crossovers ?

The GUI of the openDRC-da8 does not have any FIR controls. As I understand it correctly you have to use a FIR generation tool like rePhase?
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Old 8th September 2017, 11:48 AM   #65
WalterPPK is offline WalterPPK  Netherlands
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I found this article: A Useful Tool: Creating & Applying FIR Filters - ProSoundWeb
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Old 9th September 2017, 06:02 AM   #66
Andersonix is offline Andersonix  Sweden
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DIY PMC MB2 clone
Quote:
Originally Posted by WalterPPK View Post
Ok, you mean electrostatic loudspeakers? But I'm building studio monitors. Never seen ESL's in recording studios before.
However I really like how they sound. I have a Martin Logan setup at home which I love
I love mine too! Now I'm surprised you want domes in the studio.
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Old 11th September 2017, 07:30 AM   #67
WalterPPK is offline WalterPPK  Netherlands
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It is not a good idea to monitor and eq a live kickdrum through esl panels. Studio monitors should be able to withstand abuse. Also the horizontal dispersion is not good enough when sitting that close to the panels.

In the meantime I aquired some oak wooden panels for the baffle. Almost ready to build.
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Old 13th September 2017, 12:22 PM   #68
WalterPPK is offline WalterPPK  Netherlands
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Oak panels:

Click the image to open in full size.

The first cut. The sun came out.

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The baffle rests on felt stickers on a plate blocked by a couple of wooden strips.

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Fitting the TW29:

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fitting the Volt:

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Old 14th September 2017, 07:54 PM   #69
WalterPPK is offline WalterPPK  Netherlands
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Did some work on the bassreflex ports:

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Got some 75mm black PE pipe. Testpiece:

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Old 14th September 2017, 08:10 PM   #70
Charles Darwin is offline Charles Darwin  United Kingdom
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Looking good!
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