@blue2010 have you bypassed thetr control pod so it is just audio signal going straight into the sub's plate amp? rule out a volume problem in the plate amp first by sending audio signal directly to the plate amp (solder wires to audio ground and left + right input on pre amp panel in sub) if...

ok... just checking back in with the story thus far... i have been playing around with op-amplifiers making them operate in different ways and generally getting to know them. i had the idea that if i use a board i have (the original blown board that i fixed) i was going to try and cut pins 2 & 3...

@Abdiel  sorry i am fairly new to electronics and have not looked into filters yet... although i can see my self getting right into them after i have finished playing with attenuation and possibly doubling the tda7294 chips as to have the same config as the sub but with no filter... i have a...

i will have to experiment with op-amps at a later date... i did not do the comparison you did as i was having problems with op-amps so i bypassed all in one go... if you say they are the same then i will accept your testing but i will continue to try and change the attenuation... i will try this...

@A-Force i am pretty sure your problem will be with the op-amp as mine went quieter than the others and when i put a new one in it fixed it.   @ramachandra i have done the op-amp bypass on my board and have it running... but for some reason i think when i turn the volume up before it had more...

has anyone noticed that on this sub... the rear speakers are variable with the pod? and also the center speaker.... but only when the center and rear's are set at about half volume are they level with the front speakers... like the front speakers have got more attenuation on them? last time i...

OK... so i have double checked it and everything seems to be ok, missed one resistor (R627) but i corrected it :) this is the full schematic for the sub circuit which includes the power supply section and the pre-amp panel all in one. when my new meter turns up i will go over smd caps but they...

@ramachandra i have not found and as of yet either, the most i have found is for the pre-amp board, and parts of the pod for the signal coming into the pod and through the relevant circuitry and out of the pod to the sub (but no full schematic for the pod either). the schematics i have drawn are...

@A-Force i am new to this and have not done much experimenting with op-amps so it would be better for @ramachandra to answer your question :)       Here is the next schematic... it is of the power supply area, from the transformer's outputs to every point that supplies power to the sub and...

Here is the next one, i got carried away chasing the mute and standby pins of the tda7294 amps so i started at pin 8 on the pre-amp panel, pin 8 leads to most of the pre-amp board so i just did the pre-amp board now, will carry on with the sub schematic next.     EDIT : some things i cannot...

thanks, it is taking some time to do them, i did a little more on the sub schematic last night, got upto the U6 tda amp, done most of the pins on the U6, i have found how the system works the amps together... the U6 is the positive feed (non inverting on pin 3) which uses the wire on the back of...

@andro6600 sorry i did not comment on your mods, i have been looking through the forum now and then and keeping track but i have been using these pages for info while i have been frustrated with my own dooings lol.   great mods you have applied there, i like those heatsinks and those regs, in...

So i got back on this about a week ago, things are starting to go alot better now. i was being stupid and not using anti static equipment and not cleaning the tip, the problem was the tda amps i was soldering right/carefull enough. i focused on one and threw about 8 in one position (front left)...

yes i had the voltages wrong... i had a feeling they was wrong... i have another toroidal transformer which i must have remembered 11.4v from. yes mine is 240v... i would match the output voltages and the current capability for each output and it should fire up in a car.

@andro6600 i thought about the same thing... to put the sub into my car... they way i thought of doing it was either by using an inverter to step the voltage up from 12v to 240v and use the 240v in as usual into the sub (as long as the inverter has the correct current capability to handle the...