hey all
so i snatched up a heck of a deal on a 5.1 system (def tech bp7006, clr2002, studio monitor 350, mirage s8) for $150
however the amps in the bp7006s are shot. they do work, but barely any output. this appears to be a very common problem for the 700x modules, so replacing them with the same troubled module for nearly 200/ea just isnt worth it
i attempted the 'hum fix' which entailed replacing a small capacitor bank on the amp, which did not address the issue. i measured the 5k pots which one measured 33-39k (nice) and the other goes from 8k-12k, so i bypassed the pot, to no measurable improvement. so i suspect the main 80v 6800uf caps might be at play here, but for the price of them (heck even finding them), i could just fit in a new board into the mix
inside these units, there are some nice toroidal transformers (49.5-24-0-24-49.5), so i didnt want these to go to waste. there is no markings for a VA rating, but there is a T 3.2A L 250V fuse on the unit. so perhaps someone could help maybe give a round about idea of the output
i dont mind clogging up any existing holes on the mounting plate, so trying to get something to fit the holes exactly is not really a requirement. and i'm not concerned with the fact that these can take either rca or speaker level input, sacrifices will have to be made there, plus the rca method imo is a better way for them to be hooked up anyway
so looking at some options, in the ease of 'plug and play' i was looking at the BTL tda8954th boards, they accept a simple ACV input, so one less thing to deal with, but i'd really only be using the 24v leads and i feel like there may be options to use the 49.5v leads instead? also, the drivers are 4ohm, not sure how the 8954th boards would do btl into 4ohm as i believe it's rated SE 4ohm BTL 8ohm according to the spec sheet. i thought i read 1.2v input for max output, and with an avr generally you'll only get 0.7v so perhaps thats enough to subdue the board into an acceptable range?
thoughts? i wanted to be able to share this fix/option with the deftech community who are stuck buying $200 replacements over and over again just to get another board due to fail. def tech used to be cool and just replace them at no charge, but since being bought, they have tightened the belt
anyway, here are some pics of the modules, i'll work up some wood/allumium mounting to get everything to fit once i find the board i'll be using as a drop in
thanks for anyone who has some ideas and ways to help!
so i snatched up a heck of a deal on a 5.1 system (def tech bp7006, clr2002, studio monitor 350, mirage s8) for $150
however the amps in the bp7006s are shot. they do work, but barely any output. this appears to be a very common problem for the 700x modules, so replacing them with the same troubled module for nearly 200/ea just isnt worth it
i attempted the 'hum fix' which entailed replacing a small capacitor bank on the amp, which did not address the issue. i measured the 5k pots which one measured 33-39k (nice) and the other goes from 8k-12k, so i bypassed the pot, to no measurable improvement. so i suspect the main 80v 6800uf caps might be at play here, but for the price of them (heck even finding them), i could just fit in a new board into the mix
inside these units, there are some nice toroidal transformers (49.5-24-0-24-49.5), so i didnt want these to go to waste. there is no markings for a VA rating, but there is a T 3.2A L 250V fuse on the unit. so perhaps someone could help maybe give a round about idea of the output
i dont mind clogging up any existing holes on the mounting plate, so trying to get something to fit the holes exactly is not really a requirement. and i'm not concerned with the fact that these can take either rca or speaker level input, sacrifices will have to be made there, plus the rca method imo is a better way for them to be hooked up anyway
so looking at some options, in the ease of 'plug and play' i was looking at the BTL tda8954th boards, they accept a simple ACV input, so one less thing to deal with, but i'd really only be using the 24v leads and i feel like there may be options to use the 49.5v leads instead? also, the drivers are 4ohm, not sure how the 8954th boards would do btl into 4ohm as i believe it's rated SE 4ohm BTL 8ohm according to the spec sheet. i thought i read 1.2v input for max output, and with an avr generally you'll only get 0.7v so perhaps thats enough to subdue the board into an acceptable range?
thoughts? i wanted to be able to share this fix/option with the deftech community who are stuck buying $200 replacements over and over again just to get another board due to fail. def tech used to be cool and just replace them at no charge, but since being bought, they have tightened the belt
anyway, here are some pics of the modules, i'll work up some wood/allumium mounting to get everything to fit once i find the board i'll be using as a drop in
thanks for anyone who has some ideas and ways to help!
