Very little signal gets to the speaker. I suspect a bad component(s) in the crossover circuitry in the cabinet itself.
There is very little to an inspeaker crossover that could go bad unless it was SEVERELY overdriven. I recommend checking the speaker individually on a wire from a stereo or something powered to verify this. A crossover is nothing more than a capacitor (high cutoff) and an inductor.(low cutoff). The 600 watts rating of the cabinet is an RMS rating, meaning, .707 actual peak value free of distortion. This means that you can only drive it about 71% of that without distorting or damaging it. You said, "very little signal gets to the speaker", which sounds like "very low volume" meaning, magnet stuck, speaker not moving much, meaning warped voice coil. Check that the speaker will move back and forth with your hand freely without interference or scratchy noise. If it doesn't, the voice coil is warped and the speaker needs to be reconed or replaced.
SOURCE: I've got a Behringer Ultrabass Bb410 1200w 4x10
The cabinet is listed as a 4 ohm unit.
We would exoect to see four, 4 ohm speakers in series parallel or four 16 ohm speakers in parallel.
If teh unit seems to rattle, first put an audio oscillator into it and sweep the frequency. It is common for grilles and also logos attached to them to rattle.
Open the unit and power each speaker the same way individually for a test.
I suspect you will find either the grille or mounting hardware is actually doing the rattling OR possibly the wires inside are vibrating.
If the sound is a scratchy buzz, then the speaker(s) have probably had voicecoils damaged by overheating.
In this case, buy 4 new speakers and replace all. It is not likely to find replacements for the Buggera brand they put in these cabinets. Also the word on the web about that brand of speaker is not very good.
SOURCE: i have a bx4500h and
does the cab have a horn like the one in the photo if it does then you must think again.
you must try to get a replacement crossover or get a speaker geek to fix it for you its not so hard you can get the burnt out components fro radio shack / maplin so on. most of the blown components will show damage or smell like they are burnt because thats what they are.
the cross over plays a very important job in the fact that it filters of the top frequencies so you only get subs on the bottom 12's bass / mid on the top 12's and hi frequencies on the horn.
you will loose all the quality if you go direct and could easily blow things up especially the horn.
this speaker cab looks like a Kenny i had and when working then they are fantastic. i blow one of the sub 12's and the cross over survived so unplug the speakers and test them 1 by one with a little power from an amp and a small amp that does not matter if it gets damaged
SOURCE: My Bugera 1960 stopped working
Wiring harness connector to the power tube section is fried. A common problem with all bugera amps and many other companies also. A cheap fix. You can order the part you need from newark.com or call 1-800-4newark the part number is sku#85c0290 mfr#09-91-0500
SOURCE: direct out kills speaker signal on my behringer bx1200
If it's still under warranty, get it replaced. Otherwise, take to an authorized behringer repair shop, or your local pro-audio repair shop.
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