Modding Klipsch DD-5.1

Learnincurve · 30th August 2004, 10:31 AM

Just got hold of a Klipsch DD-5.1 decoder/preamp.

http://www.klipsch.com/product/produ...rue&rmore=true

These babies are supposed to do a pretty good job of the decoding, but the analog circuitry and power supply are basic, and the bass channel crossover frequency of 120 Hz. is too high.

Have no schematic yet, but took off the lid and found among other things 3 SB61L256bs-8 chips inside. These look like the most likely candidates for analog op amps but have as yet not found any datasheets on the net.

Was wondering among other things whether upgrading the analog amps to higher quality chips, and replacing the wall plug power supply (12v. 1 A) with something more robust and closer to the actual unit would help the sound quality.

The crossover frequency is probably set digitally so will be difficult to modify. Theres a programmable ROM in there, probably containing Dolby activation codes and settings such as the bass crossover, but Im guessing re-programming it would be beyond the scope of the amateur (is there a source out there for modded ROMS)?

Any ideas/suggestions/experience on modding?

charles0322 · 13th February 2008, 05:11 PM

I was wondering if you had any success in modding the DD-5.1

I would like to change the power supply and give it better pre-amps..

Were you able to change the x-over point for the lo end?

Thanks, Charles

Learnincurve · 14th February 2008, 07:22 AM

Hello Charles,

No I haven't. I gave up on this, as without a schematic it's impossible to find the analog preamp. I would still be very interested in doing this, as I believe that the processor is very good, and I'm sure that the steps you describe would really make a big difference. My impression of the sound is that it's good but a bit "dead and flat".

Having said all that, I really didn't try that hard to find the information we would need, and it could well be that klipsch, or the original manufacturer (I traced them to Taiwan) would be willing to provide schematics, now that the unit is out of production.

Please let me know if you have any success!

Cheers!

Marius

30th August 2004, 10:31 AM	#1
Learnincurve diyAudio Member Join Date: Aug 2004 Location: Stavanger	Modding Klipsch DD-5.1 Just got hold of a Klipsch DD-5.1 decoder/preamp. http://www.klipsch.com/product/produ...rue&rmore=true These babies are supposed to do a pretty good job of the decoding, but the analog circuitry and power supply are basic, and the bass channel crossover frequency of 120 Hz. is too high. Have no schematic yet, but took off the lid and found among other things 3 SB61L256bs-8 chips inside. These look like the most likely candidates for analog op amps but have as yet not found any datasheets on the net. Was wondering among other things whether upgrading the analog amps to higher quality chips, and replacing the wall plug power supply (12v. 1 A) with something more robust and closer to the actual unit would help the sound quality. The crossover frequency is probably set digitally so will be difficult to modify. Theres a programmable ROM in there, probably containing Dolby activation codes and settings such as the bass crossover, but Im guessing re-programming it would be beyond the scope of the amateur (is there a source out there for modded ROMS)? Any ideas/suggestions/experience on modding?

13th February 2008, 05:11 PM	#2
charles0322 diyAudio Member Join Date: Feb 2008	old thread, same problem I was wondering if you had any success in modding the DD-5.1 I would like to change the power supply and give it better pre-amps.. Were you able to change the x-over point for the lo end? Thanks, Charles

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14th February 2008, 07:22 AM	#3
Learnincurve diyAudio Member Join Date: Aug 2004 Location: Stavanger	Hello Charles, No I haven't. I gave up on this, as without a schematic it's impossible to find the analog preamp. I would still be very interested in doing this, as I believe that the processor is very good, and I'm sure that the steps you describe would really make a big difference. My impression of the sound is that it's good but a bit "dead and flat". Having said all that, I really didn't try that hard to find the information we would need, and it could well be that klipsch, or the original manufacturer (I traced them to Taiwan) would be willing to provide schematics, now that the unit is out of production. Please let me know if you have any success! Cheers! Marius

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