Jensen Speaker Problems

cobascis · Post by **cobascis** » Tue Dec 28, 2010 3:52 am

So I've been running my Bassman through this Jensen C12k since last February, on a weekly basis with a Bassman generally at 5 to 10 volume.

Recent there is a raspy spike sound when you hit a low string hard at a loud volume. The upper strings do not do this at all, so I feel like its something vibrating in the speaker.

I took it out of the cab to make sure it wasn't a screw or something, and the sound was still there. I could try to record it on microphone, if that would help diagnose it?

The speaker looks to be in perfect condition, no rips, tears, loose speaker cone, etc.?

IDEAS?

AaronGuitarDude · Post by **AaronGuitarDude** » Tue Dec 28, 2010 7:00 am

i had this problem before, i readjusted my gitar truss rod. and the buzz is gone

Jahsoul · Post by **Jahsoul** » Tue Dec 28, 2010 7:53 am

It may be pickups hitting strings?

Will · Post by **Will** » Tue Dec 28, 2010 8:34 am

Voice coil rub. Or the voice coil wires hitting the speaker.

othomas2 · Post by **othomas2** » Tue Dec 28, 2010 11:57 am

Loose valves ? loose dials.... basically anything that could be loose.

cobascis · Post by **cobascis** » Tue Dec 28, 2010 2:53 pm

Will wrote:Voice coil rub. Or the voice coil wires hitting the speaker.

This is what I was thinking, my old speaker got it too.

Post by **Doog** » Tue Dec 28, 2010 3:09 pm

I've had similar problems when my tubes needed changing, kinda weird overtones only present on low tones. It's hard to say if they'd be comparable to your problem without a sample, but yknowwwwww.

cobascis · Post by **cobascis** » Tue Dec 28, 2010 3:14 pm

My problem is with the speaker only. I isolated the cab, same sound. Then removed it from the cab, same sound.

This sucks, I think to fix it involves cutting up the dust cap and shimming, and stuff.

Post by **Doog** » Tue Dec 28, 2010 3:37 pm

I didn't mean rattling tubes, but rather faulty powertubes creating un-musical noises. If the noise is coming from the speaker, what's to say it's not being produced by the amp? Or are you able to hear the sound coming from a separate part of the speaker?

Are you able to try the amp with a different speaker, and a different amp with the Bassman cab?

cobascis · Post by **cobascis** » Tue Dec 28, 2010 3:39 pm

Doog wrote:I didn't mean rattling tubes, but rather faulty powertubes creating un-musical noises. If the noise is coming from the speaker, what's to say it's not being produced by the amp? Or are you able to hear the sound coming from a separate part of the speaker?

Are you able to try the amp with a different speaker, and a different amp with the Bassman cab?

Ahh, I see. I have band practice today so I'll check that out.

cobascis · Post by **cobascis** » Tue Dec 28, 2010 11:20 pm

Doog you are a smart one. I ran a bass amp through the speaker with no squeak.

I guess it's time to talk the ol' Bassman in again.