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I have a similar problem with my 2012 civic, I hooked up my 1800w kenwood mp to my 2 12" w6s and 1 song plays and sounds great, the rest of my songs have no bass from the subs, just the car speakers sound normal so I dont know what the hell thats all about. I thought it was a wiring issue but I can play the one song all day and it sounds perfect so any suggestions? thanks in advance
a crossover cuts the certain tones out of the sound.example: the high side cuts out low and mid tones,or the mid side cuts out high and low. The only problems this could be is that the crossover is not set right or not wired right. These speakers should be plugged into the high side of the crossover. If wired right and set right then your crossover is no good.
Without knowing exactly what modifications were made to the factory sound system, it's difficult to point you to a particular fix. The number of channels on the "big amp" that you disconnected would help. Even the make and model.
But, from your description it's possible that the previous owner installed a multichannel amp to drive both the "extra bass speaker", usually referred to as a subwoofer, and the original vehicle speakers. In that case, the speaker wiring from the head unit (receiver) was cut and the receiver side of the wires was rerouted to the input of the aftermarket amp. The output of the amp was then connected to the other ends of the speaker wiring.
To restore to the original, you need to pull the stock receiver and resplice the wiring. If the previous owner cut the plug completely, it may be necessary to purchase a replacement from your BMW dealers service or parts department. It's possible, but not likely that the previous owner used both an aftermarket "harness" and an aftermarket "reverse harness" to avoid having to cut the wiring. In that case, all you'd have to do would be remove them and plug the radio harness back into the vehicle harness (or the back of the radio). But most DIY audio enthusists don't mind butchering the vehicle wiring. And you'll probably find that electrical tape was used to secure the wiring. After a year or so under the dash, it'll be a sticky mess to unravel.
The speaker wiring colors for the '93 318i are as follows:
Left Front Speaker Wire (+): Yellow/Red Left Front Speaker Wire (-): Brown/Orange Right Front Speaker Wire (+): Black/Red Right Front Speaker Wire (-): Brown/Orange
Left Rear Speaker Wire (+): Yellow/Black Left Rear Speaker Wire (-): Black/Orange Right Rear Speaker Wire (+): Blue/Black Right Rear Speaker Wire (-): Brown/Orange
probably the amp going to safe or protect mode judging by the fact that you have 3 subs wired to it i would say it is not 1 ohm stable try disconnecting 1 sub and see if it still happens this will be running a 2 ohm load rather than 1 if it stops happening then you need to figure out a better wiring configuration that will work with your amp.
I'm having the same problem, bass will cut out randomly everything is plugged in correctly if you bump the subwoofer it seems to come back on for a bit then back off, did you ever find a solution for this?
if its cutting off and right back on then check your ground and your power wire makes sure both are connected good and none of your fuse's are blown, either that or you got a wire hooked up backwards in the sub.. but my guess is that the sub is hooked up wrong... that sub should be hooked up in a series or in parallel,
ok if your running just one speaker, it should be hooked up like this and 2 speakers are a different way...
this is parallel :pos to pos , neg to neg, then one wire coming from pos on sub to pos on amp then neg on sub to neg on amp but bridge the amp on your amp should be 2 pos and 2 neg in two different channels take the pos off the sub into the pos on 1 channel and then the neg from sub to the neg on the other channel,
this is series : on the sub it will go pos to neg then the other neg and pos will go to the amp, but make sure the pos and neg r on different sides of the sub, dont hook them both to the same coil
if your need more help give me your email and ill send you a pic of how to do it...
I'd lay you odds that you are driving the wrong speaker impedence and that you may have damaged the amp. This is most often true when you improperly bridge into the wrong load. If you are lucky enough to not have damaged the unit then you need to get your speaker load right at once before you fry it, if you do indeed have the wrong speaker load (too much).