Just got hold of a Klipsch DD-5.1 decoder/preamp.
http://www.klipsch.com/product/product.aspx?cid=433&dmore=True&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?
http://www.klipsch.com/product/product.aspx?cid=433&dmore=True&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?
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
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
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
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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