SOURCE: speaker/sub bass
If you dare to open up the case, squirt some contact cleaner into the internals of the variable resistor. If none of this makes sense, youre better off taking it to a repair shop.
SOURCE: Crackling Sound From Subwoofer
Check any wiring coming or going to the subwoofer. It sounds like it could be a loose connection. Is there a LFE or bass boost knob on your subwoofer? Does turning that up/down cause the crackling (if it exists). If so, you could use some tuner cleaner to clean the contacts on the potentiometer knob.
If the crackling is on the subwoofer only, it might be damaged from bottoming out. See if you can remove the baffle or grille covering the woofer and inspect for visual problems. You can also try to lighly push in and out on the subwoofer to hear if it makes any scraping sounds. If so, it is definitely damaged and the driver will have to be replaced.
Mike
SOURCE: Subwoofer Bass Level Problems
What is your sub stood on? If it is on a piece of furniture then this could be the problem. Bass frequencies travel further than higher frequencies due to their longer wavelength and will also be transmitted through any solid objects the speaker is in contact with. The solution is to mount your sub on a piece of foam to provide some damping.
Also if your sub has a port (a hole) on the back or side this needs to have a good 3 or 4 inches clearance from nearby walls or panels.
Finally the speaker cone itself needs to have a clear path to push sound energy into the room, if this path is blocked by furniture (some people like to hide them under tables) then it may make that furniture vibrate.
SOURCE: Sanyo DWM-2500 Subwoofer bass output
You cannot access the bass settings with the remote. The remote that comes with the DWM-2500 is Sanyo Part #RB-TS760MT
SOURCE: when no music is on the subwoofer makes low rumble sound
It's passing "engine noise" at 80hz and below. If you turn off the crossover on the amp, it will be unbelieveably loud. Check your RCA connections at the deck and at the amp. Then make sure your ground wire to the amp is solid and not oxidized. Check your battery terminal as well. Make sure your ground wire is the same gague as the power, and that it's grounded to the floor, not a seat bolt or side panel, as they are very poor grounds. Hope this helps. If you still have an issue, post a comment and I can help some more.
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