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Shroeder 212pl......what's dropped off??


barneyg42
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I noticed over the last couple of weeks as I loaded my cab in and out that there was something rattling inside. I could see this little round thing with red wire wrapped around it at the bottom when I looked in the port. Took the rear panel off, reached in and this strange little bugger was in there. Cab has performed as usual, immense, loud and with no obvious fault. Tweeter control is fully functional. Any ideas??

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[quote name='ahpook' timestamp='1475351277' post='3145342']
Could it have been connected across the tweeter to send the low frequencies to ground...maybe glued on the back of the tweeter ? Is that an old glue mark I can see on the back ?
[/quote]

Yes, there appears to be some glue residue on it. But nothing corresponding on the tweeter. There is a tiny bit of wire coming out of either side of the bugger which would stop it sitting flat on anything. Very strange, as I've said there's no discernible problem soundwise.

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[quote name='barneyg42' timestamp='1475366811' post='3145454']
Yes, there appears to be some glue residue on it. But nothing corresponding on the tweeter. There is a tiny bit of wire coming out of either side of the bugger which would stop it sitting flat on anything. Very strange, as I've said there's no discernible problem soundwise.
[/quote]

Hmmm...odd one.

Could it have fallen into your cab and, is in fact, an interloping choke ?

Edited by ahpook
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[quote name='ahpook' timestamp='1475367114' post='3145459']


Hmmm...odd one.

Could it have fallen into your cab and, is in fact, an interloping choke ?
[/quote]

Cab is very much sealed, there is a port on the front but it's covered by the grill. Nothing that size could get in!

??

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I agree with the others. It's a choke. It's got to be from the tweeter circuit because if it was from the LF circuit you wouldn't have any sound from the main driver now. It sounds like it hasn't been fixed down very well and was held on mainly by two soldered wires, which have snapped off. You need to trace the wiring from the L-pad (the tweeter volume control) back towards the input. It should lead to the crossover. If there is enough wire sticking out of the choke, you might be able to repair it - otherwise you'll need a new choke.

If this assumption is correct, you are now putting excessive power through the tweeter. So you really need to fix it, even though it might not sound any different.

Edited by stevie
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[quote name='deksawyer' timestamp='1475685737' post='3147975']
I've messaged him on FB for you...

D.
[/quote]

Thanks for that and the email address too. I hadn't gotten around to contacting him yet but sent a mail today. Being the weekend I didn't expect a reply yet but just got some advice back. It sticks to the back of the crossover using some silicon. Not sure what the silicon is really, something from a hardware store maybe?
Also how does it actually work? Does it stop the crossover heating up or something? Been a player for many years but not had to deal with something like this!

Also to add, I'm not actually sure which bit is the crossover, is it the big cylinder behind the panel going to the tweeter level control as seen in above pictures?

Edited by barneyg42
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The silicon Jorg is referring to is an adhesive and will be used to stick the coil to the crossover circuit board. I don't see tthe crossover on any of the pictures. First 2 are the tweeter level control, third is the tweeter itself and the last 2 of the choke that has dropped off.
The crossver is normally a small circuit board with resistors, capacitors and the coil mounted on it. It would have wires going to the tweeter, speaker, level control and input jack so tracing any of those should reveal it's location.
Simpistically the way it works is that it will be designed to control which ferquencies go to either the speaker or tweeter. Lets say it is designed to "crossover" at 3.5 KHz, all frequencies, (notes), below that figure go to the speaker, all frequencies of 3.5 KHz and above go to the tweeter.

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[quote name='BassBunny' timestamp='1476042937' post='3150805']
The silicon Jorg is referring to is an adhesive and will be used to stick the coil to the crossover circuit board. I don't see tthe crossover on any of the pictures. First 2 are the tweeter level control, third is the tweeter itself and the last 2 of the choke that has dropped off.
The crossver is normally a small circuit board with resistors, capacitors and the coil mounted on it. It would have wires going to the tweeter, speaker, level control and input jack so tracing any of those should reveal it's location.
Simpistically the way it works is that it will be designed to control which ferquencies go to either the speaker or tweeter. Lets say it is designed to "crossover" at 3.5 KHz, all frequencies, (notes), below that figure go to the speaker, all frequencies of 3.5 KHz and above go to the tweeter.
[/quote]

I'll have to have another good look, didn't see anything resembling a circuit board. Jorg Schroeder has been in touch and when his internet is sorted will give me more details. He has said pretty much what you've said but not how to locate the crossover. All a bit strange, when I took the back panel off I was expecting to see some kind of board so as I didn't assumed what I now know to be the level control was the crossover.

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