Double Bass Crazy 88 "Popping" Sound

[Eric Hochberg]

Who made the cabinet? Maybe you should send it in to get checked out at this point.

 

[neddyrow]

Got it here on TB. I think I’ll contact mark Robertson. He made the good one that I’ve been gigging with. Was hoping to isolate malfunctioning part and swap it out save shipping it to somebody for repair.

 

[DoubleMIDI]

Can you disconnect the tweeter at the crossover side of the cable? If not, you might need to unsolder the cable for a test.
A defective tweeter usually sounds scratchy in a higher frequency domain. Can you make a cable to connect a driver directly to a speaker jack? Then you can check the two drivers without tweeter and crossover in the circuit.

 

[Mike Arnopol]

Who made the used one? You should talk to him. The 8PR200 drivers can be blown. It should sound exactly like your other cab. What frequency is the sound? Is it a low splat or a higher "pop"? If it's only on the low notes at loud volumes it should be a loud splat. If it is only at loud volumes and the other cab is ok it might be a driver problem.

 

[neddyrow]

I plugged the speakers into my receiver and cranked up the bass and after I turned the volume all the way up, no pop.

I’ll take a pic of the guts shortly and maybe you guys can shed light on anything you see.

 

[yodedude2]

crossover? sounds crazy, i know...can you safely run the receiver outs through the cab crossover and into the speakers?

 

[neddyrow]

I’ll try that!

 

[s0707]

Can you disconnect the tweeter at the crossover end?

It would seem to me like the problem is in the crossover. One way to validate that your speakers and tweeter are good is connecting them in the good Crazy88. Just an idea, I know you may not want to chance doing anything to your good Crazy88.

Testing the crossover is harder. You or an electronics technician could use a signal generator and oscilloscope, or the way I tested my crossover when building my Fearful, with a computer, audio interface, and the TrueRTA software that has a signal generator and oscilloscope function. But I think signal generators only produce low voltages/currents and you may not be able to replicate the fault. You do need to connect the speakers or put resistors with similar loads in their place to see the real crossover behavior.

But before that, the first thing to do on the crossover is check for obvious visible problems, like faulty connections, bulging capacitors, discolored/blackened parts, etc.

I’ve attached a pic of my crossover for reference: capacitors are the cylinders; the white rectangular ones are resistors; the red ones are coils.