I think I blew out a 15 through over-excursion

[billfitzmaurice]

We practice this loud to keep up with my guitarist 4X12 with a JCM800 head. That thing is ridic loud. He has the master on 1 and it is painfully loud.

If you want to match a guitar you need no less than twice the speaker complement he has. In this case, eight twelves or four fifteens. No guitar player needs more than one twelve to be as loud as any sane person needs to be, but 'sane' and 'guitar player' very often are contradictory terms.

It seems to me that a 15 inch speaker should be able to handle 112.5 watts pretty easily (half of the amps power).

Perhaps, but pushed hard almost any amp can generate four times its rated power in peak bursts of sufficient duration to blow a driver.

 

[JLS]

We practice this loud to keep up with my guitarist 4X12 with a JCM800 head. That thing is ridic loud. He has the master on 1 and it is painfully loud.

This is not music, it's warfare.

 

[Joe Louvar]

If the diaphram is ripped, you might want to start saving for child support payments..

The diaphram is the cone.

 

[Joe Louvar]

The OP needed more volume so they turned up. However had they matched both the amp impedance and power this should not have happened. This is a good example of why it’s important to match both the amp ohms and watts. The OP, needs more speaker to utilize the amps full potential.

Or better speakers as you said.

Well...not quite.

Yes it is!!!

EDIT:

No guitar player needs more than one twelve to be as loud as any sane person needs to be

lol, someone obviously hasn’t worked with, heard or seen very many professional and sane guitarist - many combo guitar amps have more than one 12" driver.

 

[cchorney]

maybe this thread is really a band management issue - once you repair the driver, if the guitar player turns down just about everything is solved going forward.

 

[Mr. Foxen]

Lets see,

No effects.

We practice this loud to keep up with my guitarist 4X12 with a JCM800 head. That thing is ridic loud. He has the master on 1 and it is painfully loud.

Does you guitarist have his cab on the floor and stand really close to it. That is 100% gonna be the problem. Get it on another thing so it is at ear level, pointing at his ears an he'll go 'but that makes it sound rubbish'. Because suddenly he can hear himself.

 

[Tractorr]

As I said he already has the master volume about as low as it will go. Unfortunately, a JCM800 needs a certain amount of gain to get metal crunch.

 

[cchorney]

As I said he already has the master volume about as low as it will go. Unfortunately, a JCM800 needs a certain amount of gain to get metal crunch.

Then either show him how to work the volume knob on his guitar or buy him several very heavy moving blankets to drape over the front of his amp. This is an attitude problem on the part of the guitar player, not a problem you need to solve with more gear.

 

[BurningSkies]

Or better speakers as you said.



Yes it is!!!

You're going to have to elucidate upon your reasoning here. I don't think there's any sign of an impedance mismatch (I think that you're using the term 'impedance matching' differently than the technical term would suggest) here nor can we conclude that the cab is rated for lower wattage than the user applied.

As I said he already has the master volume about as low as it will go. Unfortunately, a JCM800 needs a certain amount of gain to get metal crunch.

Then either show him how to work the volume knob on his guitar or buy him several very heavy moving blankets to drape over the front of his amp. This is an attitude problem on the part of the guitar player, not a problem you need to solve with more gear.

Whelp, the JCM 800 is the problem... I agree that to get that "metal crunch" it has to be loud. The problem is that your guitarist has chosen an amp that's way too powerful to be useful on anything but a large stage/large room to effectively get the sound he wants...and you're suffering for his bad gear-judgment.

This is why the sweet baby Jesus invented the 50w head and the 35w head...so you could get that bitchin' tube crunch without needing to repair all the broken windows in your practice room. To go one further, it's too bad that it's a 4x12 stack instead of a 2x12 or a 1x12. That's a lot of speaker area.

I own a 135w tube guitar amp with 2x12" speakers and it's unbearably when turned up...which is why I don't turn it up.

 

[makohund]

Yes it is!!!

FWIW, I would said the same thing BS did. I see no indication of mismatch.

Give me your best "matched" rig, and I guarantee I can blow it up in similar fashion.

lol, someone obviously hasn’t worked with, heard or seen very many professional and sane guitarist - many combo guitar amps have more than one 12" driver.

The difference is some guitards are stupid with them, others are not. I play regularly with double that Marshall heads power and three times the speakers in the room. (Two heads, three 4x12 cabs.) They know how to work their gear, and volume is not a problem, and the tone is certainly plenty "metal". Yeah it's loud, but it isn't stupid loud, and no I don't need 24 drivers to keep up. (I only use two plus a mid.)

And I bet BFM has designs that can do the same.

 

[RickenBoogie]

HUGE +1 to the guitarists overkill rig. A 30-50 watt guitar amp paired with a single 12 can get "that tone" without killing everyone else in the band. It's ridiculous to have that big of a guitar rig outside of stadium gigs. But sadly, +1 also to mis-using your own bass rig. Learn from this, and keep rocking!

 

[bassman314]

This is why the sweet baby Jesus invented the 50w head and the 35w head...so you could get that bitchin' tube crunch without needing to repair all the broken windows in your practice room. To go one further, it's too bad that it's a 4x12 stack instead of a 2x12 or a 1x12. That's a lot of speaker area.

That's also why the Sweet Baby Jesus invented Hot Plates:

THD Electronics

If your Guitarist must play a JCM, get one of these, and everyone will love his tone.

 

[Joe Louvar]

You're going to have to elucidate upon your reasoning here.

Sure easy - when pairing up speakers with power amps the two main things that you need to pay attention to is the impedance (ohms) and power (watts). BTW - I never said an impedance mismatch damaged the cone.

As I said he already has the master volume about as low as it will go. Unfortunately, a JCM800 needs a certain amount of gain to get metal crunch.

Since this is just at practice after you fix your speakers try putting a moving blanket over the guitar speakers or point the gtr amp at the wall or both and see if that help. But either way when you play live my guess is you’re going to need more volume (more speaker and maybe pwr too).

 

[BurningSkies]

That's also why the Sweet Baby Jesus invented Hot Plates:

THD Electronics

If your Guitarist must play a JCM, get one of these, and everyone will love his tone.

And if you're cranking a Marshall stack, it doubles as a space heater for your practice room on cold nights.

 

[hdracer]

We talked the lead player in our band into leaving his JCM800 at home. He picked up a Jet City JCA20H dirt cheap and the rhythm player started using his bassman 50 and a 212. Sounds good and we don't have to mic the drums just for practice.

 

[BurningSkies]

My band has a player with 2 huge cabs and a 3000w amp...and he refuses to leave them at home. Its pretty brutal when he turns up.

 

[Tractorr]

Follow up question.

With this sort of damage is it generally just the cone and voice coil, or can the magnet be damaged as well?

 

[BurningSkies]

Follow up question.

With this sort of damage is it generally just the cone and voice coil, or can the magnet be damaged as well?

It would be rare for it to be the magnet. I think a recone kit would provide both the voice coil as well as the cone.

 

[Joe Louvar]

I don’t think you can buy a Peavey driver re-cone kits - but you should be able to get replacement drivers directly from Peavey.

 

[BAMonBASS]

This is the easiest fix. Tell your guitar player to buy an attenuator to go between his head and cab. That should fix his volume issues.

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