Am I risking blwoing my speaker?

[ketiov]

I recently tuned my guitar down to C Standard, and I'm wondering if the bass could blow the EVM 12L in the Thiele I built. I tend to boost the bass on my Mark IV kind of high.

I plan on building a 115 Thiele soon anyway to get better bottom end, but I wanna check if it's alright to use the 112.

 

[sixtonoize]

No...not even close.

 

[Shep]

What about a 7 string G tuned with a mk IIC+ on simlu class?

 

[phyrexia]

I ran a walkabout through my thiele without any trouble...

however, I have heard the 12L can take only about 100w below 100hz. So either way you're fine.

 

[ketiov]

For some reason I'm noticing my 12L farting a lot. It isn't consistent though, which is weird. I'll hit certain notes and I hear this weird hiss coming from the speaker.

But, I'm thinking maybe it's not the speaker, but a tube, because there's this weird thing going on. My Mark IV hums a bit, then sometimes stops for a bit, then continues. If I give it a good whack on top, the humming will stop. I also noticed that when I tap my guitar the right way, the humming stops until I start playing again. I think the tapping works because the amp was on top of a thiele, but now I moved it off the thiele so I'll see if the magic tap still works.

 

[stokes]

For some reason I'm noticing my 12L farting a lot. It isn't consistent though, which is weird. I'll hit certain notes and I hear this weird hiss coming from the speaker.

Could be filter caps.How old is the amp?

 

[ketiov]

For some reason I'm noticing my 12L farting a lot. It isn't consistent though, which is weird. I'll hit certain notes and I hear this weird hiss coming from the speaker.

Could be filter caps.How old is the amp?

I just had Mesa look over it this summer, and I told them I thought something was wrong with the caps, so they should have gone over them. It is mostly low notes that cause the hiss though.

 

[stokes]

I've done a couple of amps that Mesa said "did not need new caps",in each case Mesa was wrong.Now,I aint saying you definately need new caps since I havent seen/heard your amp,but the symptoms you describe certainly sound like new caps would tighten it up.Again,how old is your amp?

 

[ketiov]

I've done a couple of amps that Mesa said "did not need new caps",in each case Mesa was wrong.Now,I aint saying you definately need new caps since I havent seen/heard your amp,but the symptoms you describe certainly sound like new caps would tighten it up.Again,how old is your amp?

August of 1991, so pretty old.

I should also mention that to my ears it sounds like the hissing is coming only from the Thiele speaker. The combo speaker seems to be working fine.

 

[stokes]

In my experience,new caps will be a marked improvement,assuming they are original.

 

[ketiov]

In my experience,new caps will be a marked improvement,assuming they are original.

They probably are, seeing as Mesa didn't have any record of this amp coming in for service. It's Mark IV #352.