Originally Posted by Looneybomber
If it were me, I would try to do two things; check to make sure the crossover is ok and check to make sure the two woofers are ok.
First I would check the entire system (woofers, wiring, and crossover). I would take a D or 9v battery and touch it (not hold it) to the speaker wire going ONLY to the bottom set of binding posts (remove the gold jumpers if they're in place). I would listen for any noise and look for cone movement. If I heard nothing and saw nothing, I would move to the next step.
Second, I would pull out the two woofers and hook up a D battery to each one, or use my reciever to provide power. All I'm trying to see is if each works like it should. If they do I would run a low freq sine wave, likely 25hz at a moderate volume to each woofer to make sure there's no mechanical damage to either woofer.
Third, I would see if the crossover is ok by hooking it (the lowpass crossover for the woofers) up to my receiver at low volume and plugging in another speaker. If that speaker played music just fine, then I know the crossover is ok. If no music was heard or it wasn't low passed properly, then I know the crossover is at fault...or the wiring to and from the crossover, which I would also check.
So, you have now checked everything needed to produce the low sounds from a Beta-50.
-If a woofer(s) is damaged, replace it/them.
-If the crossover is damaged, have it repaired or replaced.
-If it was the wiring and/or connections to and from the crossover, that can be easily fixed with a soldering gun or replacing the wiring if needed (it's usually never the wiring a fault)