Speaker Sizzle

[groutfulone]

I have a 1x12 Tone Tubby cab loaded with their alnico speaker. Lately I have noticed a light sizzling sound coming from the speaker; especially with lower notes.
I mainly use my Reeves Custom 18 through this cab and right now I can not use this cab live because a mic picks it up easily.

For trouble shooting I tried the Reeves through my Marshall 2x12 and it was fine, no sizzle.
I swapped out every tube in the Reeves and it still does it.
I plugged the amp from my Bluesbreaker into the Tone Tubby and the sizzle was there, so I think this confirms it is from the Tone Tubby.
I swapped out every tube in the Marshall including the rectifier and it still does it.
My Bluesbreaker sounds just fine with its own cab and with all the same cables and guitars.

Does anyone know what that sizzle might be? I tried searching but didn't come across anything similar. It does not sound like a crackling like you would hear from bad connectors or cables -- it is a sizzle that continues from the attack of the note and the entire time it sustains. I checked the solder joints on the speaker terminals and they look nice and shiny and feel strong.

Any ideas.

[mbratch]

Could be voice coil rub.

[groutfulone]

Crap.

So, the best way for me to check would be to take it out of the cab and gently press down to feel if the cone is touching the voice coil, right?

Is there a reading I can take with the multimeter first? Or would that only show if there is actual damage to the coil?

This speaker is supposed to be 40w and my 18 watter puts out in the high 20's or almost 30w when I peg everything. Crap. I wonder if Brown Soun will replace it.

[groutfulone]

Looks like I am going to have to send in my speaker for some warranty work. The guys at TT think it sounds like something to do with the voice coil.
I checked and couldn't feel the voice coil when pressing the cone in and out with my fingers. This bums me out because it is only about a year and half old and has never had near the max wattage pushing it.

Looks like I will have to buy a Scumnico to hold me over until this is back :Devil although, my wife did not understand my logic with this point.

[mbratch]

Yeah, it's unfortunate. I bought a used Weber 12F150 from someone here at TGP a year or so ago and discovered within a couple of weeks that had exactly that same problem. I had to have it reconed.

You won't necessarily be able to feel it with your fingers. Has the cabinet been bounced around at all in shipping? Voice coil rub could be caused by other factors besides being overdriven. Physical/mechanical shock, for example. Or it could be just a latent defect.

[groutfulone]

I got the cab loaded straight from Brown Soun about a year and a half ago and I just noticed the sizzle a few weeks ago. This cab is purely my home recording/woodshedding cab. I use my Marshall for gigs.
Funny things is I probably abuse the my home use speaker more with more experimental playing styles and maybe I did it like that. Or maybe I had a voltage spike that caused the coil to heat up?
I will be fascinated to find out what it is exactly.

I have been listening to all sorts of clips tonight trying to find a good speaker to tide me over. I just may try an Scumback H75-8hp instead of the Scumnico.

I had really been debating putting the TT in my Bluesbreaker as it sound PHENOMENAL when I add it to the greenbacks. I forsee asking Brown Soun to load up a new cab so I can mix it with an H75 or M75 in my current cab for use with either my Reeves or Marshall.

Thanks for the help.

[Ronsonic]

Just to be sure. Do check that the mounting screws are secure, even and not overly tight. Even try inverting the speaker to see if that isn't better. And be sure there isn't something rattling or loose in the cab or behind the grill.

[mbratch]

Just to be sure. Do check that the mounting screws are secure, even and not overly tight. Even try inverting the speaker to see if that isn't better. And be sure there isn't something rattling or loose in the cab or behind the grill.
Great idea. Also, check for any debris that may have made its way into the speaker frame behind the cone or elsewhere that could be causing it.

[donnyjaguar]

+1 on Ronsonic's tricks. Sometimes you can play around with the torque on the mounting screws to bend the basket enough to move the voice coil away from the magnet.

[groutfulone]

+1 on Ronsonic's tricks. Sometimes you can play around with the torque on the mounting screws to bend the basket enough to move the voice coil away from the magnet.

I will cautiously try this out.
I did check the mounting screws and everything inside and out a couple of times. One of the guys from Brown Soun walked me through a few things also.

I am also going to swap out another speaker as a control to the diagnosis.
Thanks.