MiniDSP controls Ground-Effect Omni speaker system

trevmar · 15th January 2012, 07:02 PM

Hi, I have now documented my tiny bi-amped ground-effect omnidirectional speaker system.

The speakers are introduced here:
Tiny ground-effect omnidirectional biamped system - diyAudio

The amplifiers are introduced here:
Class-D Output Filter Designs, SURE TDA7498 as example

and the details of how the MiniDSP is set up to do "<ka precomp" biquads, and general compensatory shenanigans is on my website, here:
Trevor Marshall - Ground Effect Omnidirectional HiFi Loudspeakers

Thanks to the MiniDSP team for a wonderful product. I am having a ball figuring out all the neat things I can do with it

Sincerely
Trevor

trevmar · 16th January 2012, 08:10 PM

The MiniDSP parameter file (Advanced plugin) can be downloaded from:

http://trevormarshall.com/ground-eff...ffect_omni.xml
.

minidsp · 17th January 2012, 03:27 AM

Great project! We ought to advertise it better on the miniDSP website (maybe post it in the forum) and even give some sticky to all your hard work! It's really impressive how well you've been documenting the implementation and we hope that many miniDSP give a try to your work... Make us wish we would have some spare time to build one for a test. These are quite intriguing and you've obviously been doing your homework when it comes to design...

Keep up the good work!

DevTeam

trevmar · 17th January 2012, 12:08 PM

Feel free to advertise it or abstract any images. If you need more info, I will happily provide it. Thirty years ago, audio design provided my living, but these days I just engineer this stuff as a hobby, for relaxation

As for giving it a try - the Tymphany 830983 should be readily available in Hong Kong, I paid $17 for mine, and they are really the heart of the system. They sound fine without the woofers (but limit the available low bass power, of course). They put out a good sweet sound in a small apartment, such as one typically finds in Hong Kong

Switching in the MiniDSP compensation makes a HUGE difference in sound quality, not just in tonal balance. A good demonstration of the power of the MiniDSP, in fact

I left the compensation in my coefficients file to run the 830983 on its own, all you need to do is use channels 2 and 4, changing the 200Hz highpass crossover to 40Hz, or so

I did find that a single subwoofer did impair the sound (compared with two woofers).
.

minidsp · 25th January 2012, 01:14 AM

Great. We'll certainly push pics and more info of your project on our website since it's worth to our users to see your work.

DevTeam

17th January 2012, 03:27 AM	#3
minidsp diyAudio Member Join Date: Dec 2009	Great project! We ought to advertise it better on the miniDSP website (maybe post it in the forum) and even give some sticky to all your hard work! It's really impressive how well you've been documenting the implementation and we hope that many miniDSP give a try to your work... Make us wish we would have some spare time to build one for a test. These are quite intriguing and you've obviously been doing your homework when it comes to design... Keep up the good work! DevTeam __________________ www.minidsp.com - Low cost & modular audio DSP kits for DIYers - Follow our tweets @ minidsp

25th January 2012, 01:14 AM	#5
minidsp diyAudio Member Join Date: Dec 2009	Great. We'll certainly push pics and more info of your project on our website since it's worth to our users to see your work. DevTeam __________________ www.minidsp.com - Low cost & modular audio DSP kits for DIYers - Follow our tweets @ minidsp

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16th January 2012, 08:10 PM	#2
trevmar diyAudio Member Join Date: Jan 2011	The MiniDSP parameter file (Advanced plugin) can be downloaded from: http://trevormarshall.com/ground-eff...ffect_omni.xml .

17th January 2012, 12:08 PM	#4
trevmar diyAudio Member Join Date: Jan 2011	Feel free to advertise it or abstract any images. If you need more info, I will happily provide it. Thirty years ago, audio design provided my living, but these days I just engineer this stuff as a hobby, for relaxation As for giving it a try - the Tymphany 830983 should be readily available in Hong Kong, I paid $17 for mine, and they are really the heart of the system. They sound fine without the woofers (but limit the available low bass power, of course). They put out a good sweet sound in a small apartment, such as one typically finds in Hong Kong Switching in the MiniDSP compensation makes a HUGE difference in sound quality, not just in tonal balance. A good demonstration of the power of the MiniDSP, in fact I left the compensation in my coefficients file to run the 830983 on its own, all you need to do is use channels 2 and 4, changing the 200Hz highpass crossover to 40Hz, or so I did find that a single subwoofer did impair the sound (compared with two woofers). .