Followup article on 4-way open-baffle with miniDSP

JohnR · 21st March 2011, 04:55 AM

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 2×4

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

JohnR

bobkamikaze · 21st March 2011, 12:10 PM

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.

JohnR · 02:53 PM

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 - ?

bobkamikaze · 21st March 2011, 03:30 PM

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.

JohnR · 21st March 2011, 04:11 PM

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

bobkamikaze · 21st March 2011, 04:42 PM

Whatever, I'm interested in phase, waterfall, frequency and distortion graphs.

JohnR · 21st March 2011, 05:14 PM

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.

bobkamikaze · 21st March 2011, 08:00 PM

Ok, but I do not get why so hard do measurements again.
And how you control volume control? Before filter or after?

JohnR · 22nd March 2011, 07:14 AM

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.

bobkamikaze · 23rd March 2011, 11:49 AM

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.

21st March 2011, 04:55 AM	#1
JohnR diyAudio Member Join Date: Dec 2001 Location: Steak and Kidney	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 2×4 I'd be happy to try and answer any questions or receive feedback or suggestions - thanks JohnR

21st March 2011, 02:52 PM	#3
JohnR diyAudio Member Join Date: Dec 2001 Location: Steak and Kidney	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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21st March 2011, 12:10 PM	#2
bobkamikaze diyAudio Member Join Date: Dec 2008	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.

21st March 2011, 03:30 PM	#4
bobkamikaze diyAudio Member Join Date: Dec 2008	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.

21st March 2011, 04:11 PM	#5
JohnR diyAudio Member Join Date: Dec 2001 Location: Steak and Kidney	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

21st March 2011, 04:42 PM	#6
bobkamikaze diyAudio Member Join Date: Dec 2008	Whatever, I'm interested in phase, waterfall, frequency and distortion graphs.

21st March 2011, 05:14 PM	#7
JohnR diyAudio Member Join Date: Dec 2001 Location: Steak and Kidney	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.

21st March 2011, 08:00 PM	#8
bobkamikaze diyAudio Member Join Date: Dec 2008	Ok, but I do not get why so hard do measurements again. And how you control volume control? Before filter or after?

22nd March 2011, 07:14 AM	#9
JohnR diyAudio Member Join Date: Dec 2001 Location: Steak and Kidney	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.

23rd March 2011, 11:49 AM	#10
bobkamikaze diyAudio Member Join Date: Dec 2008	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.