Followup article on 4-way open-baffle with miniDSP - diyAudio
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Old 21st March 2011, 04:55 AM   #1
JohnR is offline JohnR  Australia
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Default Followup article on 4-way open-baffle with miniDSP

I've done more work on my 4-way open baffle speaker and the article is now published in hifizine:

Refining a 4-way open-baffle speaker with the miniDSP 24

I'd be happy to try and answer any questions or receive feedback or suggestions - thanks

JohnR
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Old 21st March 2011, 12:10 PM   #2
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Nice work!
Can you please show phase, waterfall, frequency and distortion graphs? ALso, can you send .pir file so I can import it into program like Arta.
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Old 21st March 2011, 02:52 PM   #3
JohnR is offline JohnR  Australia
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Hi Bob - that wasn't quite what I meant by offering to answer questions :O Perhaps next article, if you could explain more what you'd be looking for in that information - ?

Last edited by JohnR; 21st March 2011 at 02:53 PM. Reason: Clarification
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Old 21st March 2011, 03:30 PM   #4
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I'm interested in graph like in this build PRELUDE
not only Frequency response, because it's nothing without other graphs.
Also, equalization is a bad way to build system(well for subwoofer maybe it's ok). Resonances an peaks it's a aftereffect and best way, to kill it it's eliminate the cause of it.
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Old 21st March 2011, 04:11 PM   #5
JohnR is offline JohnR  Australia
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Oh. Well, it sounds like you've made your mind up. If you read the article though you'll see that a good amount of the eq is related to the drivers or their use in open baffle configuration. The rest, I guess you can argue about. Anyone can try it either way for themselves and make their own mind up - that's why it's DIY
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Old 21st March 2011, 04:42 PM   #6
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Whatever, I'm interested in phase, waterfall, frequency and distortion graphs.
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Old 21st March 2011, 05:14 PM   #7
JohnR is offline JohnR  Australia
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OK, I'll try to provide some of those in a future article. Won't be until after the next version of the baffle is made.
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Old 21st March 2011, 08:00 PM   #8
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Ok, but I do not get why so hard do measurements again.
And how you control volume control? Before filter or after?
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Old 22nd March 2011, 07:14 AM   #9
JohnR is offline JohnR  Australia
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Hi Bob - it's time consuming, and measurements need a purpose and need to be interpreted and explained. The article was a lot (huge amount) of work and I'd really prefer to just answer questions about it, and have a break from the measurements and so on until I get geared up for the next article. Sorry, I hope you understand.

With regards to the volume control, I do it before the DSP. Doing it after would require 8 channels of attenuation - surely feasible but not something I'd like to do at this point.
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Old 23rd March 2011, 11:49 AM   #10
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Ok, will see. And my one more question: this graph http://www.hifizine.com/files/2011/0...r-versions.png was measured with what kind window time? I think above 50ms or even more.
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