Recent content by icango

> Try turning the volume on one of your amps ALL the way > down... do tell me what happens? I don't get anything out of that amp, and I get the same volume out of the other one. You might be referring to an input circuit where the input "sees" the volume pot wiper, which would present an...

I'm not arguing against any of the solutions proposed above, but don't overlook the possibility of a simple metal box with three phone jacks wired in parallel. I've seen this work well in some cases and I've used it many times in the past. It'll depend on the output impedance of your bass's...

Had one for a couple of years and was happy with it. Just be careful with that SVT, especially with the bass control, doubly so if you're playing a 5- or 6-string. That's a ported cab, not a sealed one, so at some frequency the cones will unload and flop around. The SVT's output transformer will...

It happened to me when I was 16. I had (of all things) a Teneyck bass amp and a no-name short-scale bass. I think the Teneyck's back cover vibrated more than the speaker cones did. You could watch it go blurry while you played. A truly omni bass amp. We were rehearsing, we got hungry, I made a...

Ok, I just saw your reply about the speaker movement being position-dependent rather than speaker-dependent. (Is that what you mean?) If so, then again I say bypass the crossover. If it were my cab, I'd replace the wiring altogether, bypassing the crossover in the process. New wiring and new...

I'm going on the theory that there's more than one problem at work here. On paper, the crossover "should" be a non-contributor. But it's in the circuit. It's a zero-cost, ten-minute job to bypass it and thus be absolutely sure -- rather than 99% sure -- it's not to blame. I agree it's...

I went to a Jefferson Airplane/Starship concert way back when I had hair and saw Jack Casady playing through what looked like Dual Showman cabs with JBLs and two big strips cut out of the baffle board at opposite ends. No grille cloth. Can't remember how many cabs but it was at least two. I was...

Try taking it out of the circuit entirely. (Wire the six bass drivers direct to the cab speaker jack per John's schematic.) Don't worry about finding a new one. That has nothing to do with your next troubleshooting step, which is eliminating your crossover from the speaker circuit. (Just...

I vote no on that combination, but not solely because of the V4B. With two of those cabs, maybe. But not one. You'd be running on the hairy edge all the time. There's only so much two forward-facing fifteens can do. You have to move more air, in my opinion. A V4B will sing into four fifteens if...

Yep, I haven't been inside one of those cabs but that circuit board sounds like the crossover. At this point that's your prime suspect. Either that or its connector(s).

This sounds like something not user-repairable. My first guess is one or more of the outputs is going into thermal runaway, triggering the fan. That would be based on heat-sink temp, but I've never seen one of those amps and so I'm not sure if they use that method to determine fan speed or some...

How 'bout trying a different head with that cab? Can you borrow one for a five-minute test? Even if it's a non-BG head? It's possible whatever "event" caused that driver to blow also compromised the amp you're using. It's a long shot but in my opinion still a worthwhile exercise. Also make...

When I had a V4B in the '70s, the best speaker setup I found was two cabs each with two fifteens: a B25B and a V6B. I laid them down sideways. This was back when few bands were putting everything through the mains. Prior to that I played for about a year with an SVT cab but that cab was a...