Digital predistortion for speaker correction

[noah katz]

"Linear distortion (ie frequency response) is 'pretty easy',"

Except that it changes because voice coil temp changes the T-S parameters.

Tom Danley (inventor of the Contrabass and Tapped Hoen speakers) sauis recently on AVS forum that these changes become significant at about 10% of a drivers rated power output.

[noah katz]

chrisybee,

Huh? For the life of me I can't figure out what your web site is or what it offers?

[dmfraser]

The problem with this approach is that speakers change as they age. So unless a system can be calibrated every now and again, the pre-distortion will slowly become worse than useless.

The B&O speakers are set up to do exactly this. The catch is that they are hideously expensive. And they can only calibrate as good as the microphone.

This sort of trickery comes out every now and again and has not caught on yet.

I still think you are better off buying or building good speakers, with either minimal coloration or colorations you like and placing them properly in the room.

Then listen to the music and not to the speakers. You may think this is the same thing but I assure yiu it is not. If you listen to music, even fairly basic speakers work OK. If you listen to the speakers, you will never be satisfied.

[DSP_Geek]

Originally posted by noah katz
"Linear distortion (ie frequency response) is 'pretty easy',"

Except that it changes because voice coil temp changes the T-S parameters.

Tom Danley (inventor of the Contrabass and Tapped Hoen speakers) sauis recently on AVS forum that these changes become significant at about 10% of a drivers rated power output.

Or about 10 dB down, not hard since the peak-to-average ratio of music is easily 5:1 for decently recorded pop, more like 10:1 or 20:1 for classical. In other words, that's not a big deal for home listening.

In any event, the dominant problem for bass EQ is the room, and that won't change if the voice coil heats up. Mid and high EQ is mostly a matter of controlling cone and rear chamber modes, once again unaffected by voice coil resistance. Linear correction is thus not a bad idea.


Francois.

[ghemink]

Originally posted by phase_accurate
Not like your proposal but better i.e. it goes two steps further in that it corrects room interactions as well and it does not only correct in the frequency domain :

http://www.tactaudio.co.uk/Products/...n_systems.html

This one also uses digital correction of the drivers, FIR crossover and it can be tuned to your room as well:

http://www.klein-hummel.de/produkte/...c_front_hq.jpg

Regards

Charles

http://www.deqx.com has a nice toy too.

Best regards

Gertjan