Removing a Tweeter

[Count Bassie]

So I've disconnected the wires going to the tweeter from the L-pad, according to instructions from Richard Schroeder (the younger), and the buzz is worse.
I know the 10" driver is good. And when I tested them individually the 12 did not have an issue.
I see myself drizzling dilute Tite-Bond III into the joinery throughout the inside of the cab.
Fortunately I haven't stuck myself without an alternate cab.

 

[Count Bassie]

Could a "worn out" or somehow compromised crossover introduce distortion/dirt into the signal?
I'm asking a lot of elementary questions, which is part of my frustration here.
I am bound and determined to at least know what my problem is. Whether I'm able, or willing at this point to solve it is my next subject ($). But having had the thing for six weeks or so I'm not willing to let the time be blown for nothing.
Going back to the tech this week, maybe I'll leave it, let someone with actual knowledge spend a little able and focused energy on it.

 

[agedhorse]

Could a "worn out" or somehow compromised crossover introduce distortion/dirt into the signal?
I'm asking a lot of elementary questions, which is part of my frustration here.
I am bound and determined to at least know what my problem is. Whether I'm able, or willing at this point to solve it is my next subject ($). But having had the thing for six weeks or so I'm not willing to let the time be blown for nothing.
Going back to the tech this week, maybe I'll leave it, let someone with actual knowledge spend a little able and focused energy on it.

No, it's not the inductor unless it's loose and vibrating around.

Did the tech test the driver IN THE CABINET? If the frame is distorted when it's mounted, this is exactly the symptom you will hear. This happens when the screws are over-tightened and the mounting surface is not flat.

Reconnect the tweeter before you cause a new (and more expensive) problem. Schroeder knows nothing about amp design and stability which results in poor advice being given. I haven't seen the crossover schematic, but without knowing for sure that it won't create an underdamped reactive load that is dangerous to the amp, that's a bad thing to suggest.

 

[Count Bassie]

No, it's not the inductor unless it's loose and vibrating around.

Did the tech test the driver IN THE CABINET? If the frame is distorted when it's mounted, this is exactly the symptom you will hear. This happens when the screws are over-tightened and the mounting surface is not flat.

Reconnect the tweeter before you cause a new (and more expensive) problem. Schroeder knows nothing about amp design and stability which results in poor advice being given. I haven't seen the crossover schematic, but without knowing for sure that it won't create an underdamped reactive load that is dangerous to the amp, that's a bad thing to suggest.

Ah yeah this came up before. It was just a minutes worth, message received. Thank you. And yeah the tech is next, the whole cab.

 

[agedhorse]

All it takes is a few milliseconds… under the wrong conditions.

 

[Count Bassie]

If I have to start over I'll be throw in a heads up.

 

[Count Bassie]

So it's been a very long, slow plod, but the Schroeder 1210 is at a competent tech's shop. I'm hoping a simple word comes of it and that a solution is come upon.
Worst that can happen is I'm out $250 and a little $ for Butch's time.
Best, it's a cheap fix that I needed a trained eye to see.
The amp seems fine, I've been playing it through the Kappalite-loaded 215 garage bomb, sounds great.
Worst case scenario, I have to go buy something...

 

[Count Bassie]

Oh, I forgot about this thread- the Schroeder has been repaired. Turns out that where the cone joins the voice coil assembly on the 10"driver had separated, and at a certain frequency it would rattle, creating the distortion-like sound.
The tech I brought it to (Butch Balzano, RI Music Service) who is a locally renown amp tech, sound guy and speaker recone expert, glued it back together and voilá, good as new.
So I was using it again, until I decided I could afford the Markbass 58R102 Pure I'd found locally. The Schroeder had proven a little awkward, and just enough on the heavy side, to make a switch. I'm not sure which sound I actually like better, but the Markbass seems to be a little clearer. And moving it is like picking up an empty cardboard box, which I find to be a hilarious experience. Between that and the 7+ lb Mesa Subway head, I wonder how this stuff can make any sound at all. But it does.
Anyway, the Schroeder 1210 is finally what it should be. Thanks everybody, for following along/taking part, and helpful counsel.

 

[agedhorse]

Excellent. It’s much easier to fix a problem when it’s correctly identified first.