So i just found out today that my midbass rears are making static noise when I bump up my music on the Stock HU to anything past 24 watts. I noticed it when I faded everything ot the rear, and it gets worse when I balance the music to either side on the rear.

what should I replace it with? or does it need replacing at all.... I installed a JL system and tapped the Bose amp.

 

Crackling like cone / speaker damage crackling? Or crackling like electrical noise / hum? Since you just installed a sub I am going to assume they didn't make that noise prior to that point. So in that case the speakers are probably fine, something is giving you some noise. Did you tap a signal from the rear speakers to your amp? That could be a possible noise inducing issue. Do the basic, check grounds and connections. I know sometimes the "Teeth strip, twist and electrical tape" method is used, and it will get you through, but spend a few dolla's buy those butt splices and be done with it.

 

Ive had the Sub setup for quite some time. I followed the DIY on the Audio forum on adding a sub to your bose system. But i thought the wires that were tapped were input wire into the amp from the Head Unit. It sounds like electric static. And the noise only happens when I turn the volume up too high.

 

I can't safely say what the issue is. If you grabbed the signal pre-amp that is a really low level signal, only a few volts if that. My guess is that since that low voltage is now being split by half, it is lowering the signal level into the Bose amp and causing the issue. The speaker is probably making that noise all the time but only audible at high volumes. If you feel like experimenting, grab that signal post Bose amp and see if the issue still exists. That or fade some to the front so it doesn't audibly occur until a volume just above what you would be listening to.

 

cool thanks.. any idea what the volts should read pre and post the amp?

 

I read it somewhere here in DIY forums, someone had the specs. Can't recall exactly which one right now, if memory serves I would say ~1.5 volts.

 

Sounds to me like you're running the balanced signal into an amp that doesn't support it.

Disconnect the amp and make sure the noise doesn't exist on the stock speakers. If it isn't, run something else to the inputs on the amp at different volume levels to see if it exists in the amp.

If there's no noise in either of those situations, your amp just doesn't like the balanced signal from the Bose headunit. If your amp supports speaker-level input, you can use that instead of the line-inputs and be ok, or you can get a converter to convert the balanced signal to normal and continue using the line inputs.

 

Good call, didn't think about that. If that turns out to be the issue then speaker level inputs would be the easiest way to go. If you want to stay with the pre-amp signal you will need a LOC if your amp doesnt support balanced inputs, which will add some compexity to the system and possibly induce alternator noise. Just something to be aware of.