20 Most Recent Infinity BU-120 Subwoofer Questions & Answers

Resistors in sound system tend to burn out with short circuits or bad speaker wires. The best thing to do get it repaired is to contact the maker of the device and they well let you have the number of the authorised service centre for where you live.

Time for a new one. Yours is shorted out internally, and could possibly start a fire inside itself. God bless your efforts.

Msullivan56 & son, Yes indeed... We are on luck... There are circuit board layout drawings... on my Favorite FREE "manual" site ... starting on page 20 (SHOWING POLARITY)... Plz click here... Infinity BU 120 Service Manual Amplifier subwoofer Bu 120 hts Hope this helps...My First "experience" of getting soot embedded in my SAFETY GLASSES... WAS PLACING OF A MODERATE SIZED "POLAR" filter capacitor in a pretty large RECTIFIER PANEL...I HAD FOLLOWED the Circuit Drawing ... (arguably correctly)as there was very little of it left)) when POWER WAS RESTORED ... (sort of)I came out of the EXPERIENCE WITH AN ENDURING respect for SAFETY GLASSES... looking rather like a Raccoon (I'm just saying).Wear them...!! Carnac the Magnificent

Did you have your power on when you plugged anything in if so h could have seized your magnet for fried your voice

is it sitting next to any power source if so remove it away from the power source that will not make noisethe sub is just making the frequency noises from electricity

I have the part you are looking for if you still are in need of it. Sweet-sounds Mark

Disconnect the sub-woofer and see if the noise stops, if so the amplifier is OSCILLATING and so produces the noise.This can be related to fault with the pre-amp or audio processing section. Try and heat up the circuit using a hair dryer and if the fault clears then there are faulty electronic capacitors. If leak is seen then the pcb must be washed after the capacitor is replaced which can solve the issue.

There is no main AC power switch on the BU series; it's in standby mode whenever it's plugged in.

When playing music normal LED color should be green. After no signal for 10 minutes or so it will turn back to Red (Standby)

Shorted to ground.