barneyg42 Posted October 1, 2016 Share Posted October 1, 2016 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?? [URL=http://s218.photobucket.com/user/widget42/media/Mobile%20Uploads/IMG_6383.jpg.html][IMG]http://i218.photobucket.com/albums/cc296/widget42/Mobile%20Uploads/IMG_6383.jpg[/IMG][/URL] [URL=http://s218.photobucket.com/user/widget42/media/Mobile%20Uploads/IMG_6384.jpg.html][IMG]http://i218.photobucket.com/albums/cc296/widget42/Mobile%20Uploads/IMG_6384.jpg[/IMG][/URL] [URL=http://s218.photobucket.com/user/widget42/media/Mobile%20Uploads/IMG_6386.jpg.html][IMG]http://i218.photobucket.com/albums/cc296/widget42/Mobile%20Uploads/IMG_6386.jpg[/IMG][/URL] [URL=http://s218.photobucket.com/user/widget42/media/Mobile%20Uploads/IMG_6387.jpg.html][IMG]http://i218.photobucket.com/albums/cc296/widget42/Mobile%20Uploads/IMG_6387.jpg[/IMG][/URL] [URL=http://s218.photobucket.com/user/widget42/media/Mobile%20Uploads/IMG_6388.jpg.html][IMG]http://i218.photobucket.com/albums/cc296/widget42/Mobile%20Uploads/IMG_6388.jpg[/IMG][/URL] Quote Link to comment Share on other sites More sharing options...
MoonBassAlpha Posted October 1, 2016 Share Posted October 1, 2016 Well it looks like a choke, part of the crossover, though the photos don't really show any wires that were once soldered. If it's the bit that rolls the treble off the woofer, the lack of it may not be all that apparent. Quote Link to comment Share on other sites More sharing options...
ahpook Posted October 1, 2016 Share Posted October 1, 2016 (edited) 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 ? Edited October 1, 2016 by ahpook Quote Link to comment Share on other sites More sharing options...
barneyg42 Posted October 2, 2016 Author Share Posted October 2, 2016 [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. Quote Link to comment Share on other sites More sharing options...
ahpook Posted October 2, 2016 Share Posted October 2, 2016 (edited) [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 October 2, 2016 by ahpook Quote Link to comment Share on other sites More sharing options...
barneyg42 Posted October 2, 2016 Author Share Posted October 2, 2016 [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! ?? Quote Link to comment Share on other sites More sharing options...
ahpook Posted October 2, 2016 Share Posted October 2, 2016 [quote name='barneyg42' timestamp='1475367419' post='3145463'] 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! ?? [/quote] We'll have to wait for keener minds than mine... Quote Link to comment Share on other sites More sharing options...
gary mac Posted October 2, 2016 Share Posted October 2, 2016 When I was trying to sort some electrical faults on a Shroeder, I contacted Jorg Schroeder through the website, he replied very promptly and was very helpful. Quote Link to comment Share on other sites More sharing options...
barneyg42 Posted October 2, 2016 Author Share Posted October 2, 2016 [quote name='gary mac' timestamp='1475394851' post='3145519'] When I was trying to sort some electrical faults on a Shroeder, I contacted Jorg Schroeder through the website, he replied very promptly and was very helpful. [/quote] I'll give that a try!! Quote Link to comment Share on other sites More sharing options...
gary mac Posted October 2, 2016 Share Posted October 2, 2016 Best of luck, I'm sure he will get you sorted in no time. Quote Link to comment Share on other sites More sharing options...
barneyg42 Posted October 2, 2016 Author Share Posted October 2, 2016 [quote name='gary mac' timestamp='1475404066' post='3145611'] Best of luck, I'm sure he will get you sorted in no time. [/quote] Email sent! Quote Link to comment Share on other sites More sharing options...
barneyg42 Posted October 5, 2016 Author Share Posted October 5, 2016 No reply from Shroeder as yet, any other clever bods have any idea? Quote Link to comment Share on other sites More sharing options...
stevie Posted October 5, 2016 Share Posted October 5, 2016 (edited) 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 October 5, 2016 by stevie Quote Link to comment Share on other sites More sharing options...
deksawyer Posted October 5, 2016 Share Posted October 5, 2016 I've messaged him on FB for you... D. Quote Link to comment Share on other sites More sharing options...
barneyg42 Posted October 9, 2016 Author Share Posted October 9, 2016 (edited) [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 October 9, 2016 by barneyg42 Quote Link to comment Share on other sites More sharing options...
BassBunny Posted October 9, 2016 Share Posted October 9, 2016 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 Link to comment Share on other sites More sharing options...
barneyg42 Posted October 9, 2016 Author Share Posted October 9, 2016 [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. Quote Link to comment Share on other sites More sharing options...
BassBunny Posted October 9, 2016 Share Posted October 9, 2016 Where does the black/white wire from the jack socket go? Quote Link to comment Share on other sites More sharing options...
ahpook Posted October 9, 2016 Share Posted October 9, 2016 [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. [/quote] Indeed, some kind of silicone adhesive. Quote Link to comment Share on other sites More sharing options...
gary mac Posted October 10, 2016 Share Posted October 10, 2016 Here is a pic of an old Schroeder crossover that I had to replace. [url="https://flic.kr/p/M6ExWJ"][/url] Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.