Guitar amp through bass cab question.

[Hp Riffcraft]

Ok so i play guitar in a band, i know this isn't a guitar forum but my cabs are bass cabs so i thought this still might apply.

I run a 4 ohm Marshall 100 HDFX guitar head into two 8 ohm Peavey Headliner bass 4x10's(400 watt max each), when I turn up to about half volume i get some crackling in the top cab, i was wondering if this was because i have them stacked on top each other and there is a lot of vibration from the bass or if there is something wrong with my setup?

i've rearraged the cabs and i always get the crackling in the top cab, it doesn't seem to do it when they sit side by side but then im afraid i would have trouble hearing myself in a live setting that way.

any thoughts?

[Rick Auricchio]

Try sitting on the floor and playing with the cabs side-by-side.

I'll bet you just aren't hearing the crackling in the lower cab because your ears are not on your knees.

[Hp Riffcraft]

I will definitly try this, what would cause this and what could I do to prevent it?

[lowendrv]

Are you using speaker cables or instrument cables to hook up to the head. I had guitarist that once used instrument cables and it crackled like all hell as soon as he turn up at all.

[Hp Riffcraft]

I'm using the lead cables that came with my marshall half stack, also when i only run one cab there is no crackling.

[lowendrv]

What gauge are cables ? Try 18 gauge wire and see if it goes away. Borrow some wires from your bass player to test it. Does it happen when you run it a 4 ohms with others cabs?

[Hp Riffcraft]

I have a marshall cab that came with the head it's 8 ohms and i've never had it crackle also i plugged in one of the peaveys and the marshall cab setting side by side and i didn't hear it then either.

[lowendrv]

How about with the Marshall on top of the bass cab, get it near your ears. Not side by side. The only other thing I can suggest start check all the connections in the cabinets.

[Hp Riffcraft]

I just recently got the 2 peavey 4x10's before that i was just running the 1 marshall 4x12 cab but i had it on an amp stand so it was up high and i never got the noise, could my amp be underpowered when running the 2 4x10's, i got down on the floor and played with my ear by the bottom 4x10 and i didn't hear anything crackling i think it's just coming from the one on top.

should i put something in between the two cabs to absorb the vibrations?

[oinkbanana]

if you switch which one is on top & bottom... is it the same cab that's making the noise?

[nashman]

Clean all jacks and cable plugs with Caig's Deoxit.

[anderbass]

If those peavey cabs have a tweeter, that might be what your hearing. I'd try turning them off (or disconnecting if necessary) for guitar duty.

[capnjim]

Ditto on the tweeter.

[Hp Riffcraft]

I'm not sure but i don't think there is a tweeter in these cabs, but let me do some checking.