Ampeg Portaflex 210 Trouble - Clipping? Nov 19, 2019 20:35:17 GMT -6
Post by Tbone81 on Nov 19, 2019 20:35:17 GMT -6
I needs some help troubleshooting a problem. I bought an Ampeg portaflex 210, used. I found a pf-500, b-stock (site stated it was previously owned) on Alto Music for a really good price. I purchased it and upon plugging it in the pf-500 immediately clipped (even though it was at a way low volume), went into protection mode and ceased to work. There is a well known issue with the pf-350/500 that's documented all over the web. Basically the early revisions had this issue. So I returned it, and Alto graciously sent me a brand new pf-500 as a replacement.
Now, heres wear the head scratching begins...I plug the new amp head in and it starts clipping immediately. It doesn't go into protection mode, but it does cut out for a second every time it clips. It happens with the volume and/or gain at very low levels. I was about to loose my shit and curse these new school class D amps but decided to try it on another cab. So I wired up the pf-500 head to two 16 ohm guitar cabs (i don't currently have any other bass cabs), and bam! Works perfectly, doesn't clip, doesn't cut out, its nice and loud at not even half volume. So then I try running a guitar head, at 8 ohms, in the bass cab (which is also 8 ohms), and even with the guitar amp cranked the cab is barely making a sound.
So now I'm left wondering wtf is going on with this bass cab? The speakers are plugged in, all physical connections (both in and outside the amp) feel to be seated securely. But how is it that this cabinet is barely passing any sound? And is the cab that was actually clipping and not my amp? I'm thinking maybe there is something defective in the crossover causing it cut out.
I already ruled out issues with my bass, cables, and speaker cables.
Any suggestions? If I pull the crossover out what should I be looking for?
Thanks in advance.