No highs, no lows,it must be Bose. The Bose speakers are probably not the problem, it's the amps which used to be in each speaker enclosure. The capacitors leak and ruin the circuit. You can find places to replace the amps on the net at about $45 each if you are lucky. Otherwise the the speakers are like $425 retail with the entire enclosure including the amp. Your alternative is to tear out the complete system and run 8 amps. Someone who has already done this may have some good amps left over and sell at a good price. That is how I replaced mine on my 300ZX.