1976fenderhead Posted November 20, 2017 Share Posted November 20, 2017 I have 2 GK Neo 112 cabs and one of them, even if unplugged, is making a rattling noise that sounds similar to distortion even if the cab is unplugged, just from the vibrations of the other cab when I play. I've tightened all the screws I could and no change, then identified the rattle as coming from the front, tried pressing on the cone while the rattling was going on and that stops it. So it's coming from the cone, pressing elsewhere does nothing. Any ideas why this might be happening? Would a blown driver rattle through vibrations even if unplugged? Quote Link to comment Share on other sites More sharing options...
Phil Starr Posted November 22, 2017 Share Posted November 22, 2017 It's possible anything loose in the room will rattle if you play loud through another cab. If your cab hits the tuning frequency of the broken cab it might even be quite loud. All I can suggest though is that you go through the usual checks. make sure nothing inside the cab is touching the cone, check the internal wiring in particular. then check that the driver is properly bolted down. Go right round the cone making sure everything is glued in place properly checking the corrugated surround and the central dust cap in particular. Also check the rest of the cab to see if anything is loose, it can be difficult to exactly locate where a rattle is coming from by ear. Good luck Quote Link to comment Share on other sites More sharing options...
1976fenderhead Posted November 23, 2017 Author Share Posted November 23, 2017 Thanks, most of those checks are above my technical capacity though... From GK tech support's input, it seems a replacement may be necessary. I'm in touch with the Bass Gallery at the moment to get it checked and replaced if necessary... Quote Link to comment Share on other sites More sharing options...
geoffbyrne Posted November 23, 2017 Share Posted November 23, 2017 I had that prob with mine. Opened it up & removed speakers to find cable resting against cone. Tied it back, all ok. Worth a check. G. 2 Quote Link to comment Share on other sites More sharing options...
Tonteee Posted November 23, 2017 Share Posted November 23, 2017 Plus one to the above. Had this happen on one of my old Marshall cabs, which had been rewired prior to my ownership for unknown reasons. 1 Quote Link to comment Share on other sites More sharing options...
1976fenderhead Posted November 23, 2017 Author Share Posted November 23, 2017 Hmmm, is it tricky to open a cab up like that, or is it only a matter of unscrewing and screwing back on? Quote Link to comment Share on other sites More sharing options...
Tonteee Posted November 23, 2017 Share Posted November 23, 2017 I've never owned the particular cab in question, but based on a picture on the internet it seems front loaded. take the grille off (looks like two screws on each side wall) and the driver(s) will be screwed down. you can then pop the drivers out and have an inspect. With the grille off, I'd also run up the cab and see if the rattle goes away - as it has a metal grille. With one cab I had, I ended up making up soft PE bushes to stop the metal grill rattling against the wooden cab when pushing air. Quote Link to comment Share on other sites More sharing options...
geoffbyrne Posted November 23, 2017 Share Posted November 23, 2017 30 minutes ago, Tonteee said: With the grille off, I'd also run up the cab and see if the rattle goes away - as it has a metal grille. With one cab I had, I ended up making up soft PE bushes to stop the metal grill rattling against the wooden cab when pushing air. I've also come across that prob (not same cab). Lay cab on back. Take screws out grill. Remove grill. Remove screws/bolts from top cab & lay on top of cab. Look inside with torch & see if anything is touching cone. Fix if so. Put back together. G. Quote Link to comment Share on other sites More sharing options...
1976fenderhead Posted November 23, 2017 Author Share Posted November 23, 2017 (edited) Cheers guys, I'll give that a shot. If I shake the cab I hear something that seems to be dangling inside (like a cable), but that might be the cone itself I suppose... I'll report back. Edited November 24, 2017 by 1976fenderhead Quote Link to comment Share on other sites More sharing options...
Tonteee Posted November 23, 2017 Share Posted November 23, 2017 Sounds like a 'lucky' extra screw, but you'll see. Looking forward to the report back! Quote Link to comment Share on other sites More sharing options...
1976fenderhead Posted November 24, 2017 Author Share Posted November 24, 2017 (edited) Ok, so here are my findings: I don't see anything touching anything inside, or loose or dangling, everything seems fine. With the cab unplugged: With the cab resting on its back, speaker pointing up, if I play a low note the cone rattles with the vibrations in the room. If I pull it out of its hole and rest it on top the cab (next to hole, pointing up), vibrations stop. If I start lowering it back into the hole, when I get to about an inch of it resting in place, it starts rattling again. With the cab plugged: It just farts no matter what as notes are played. If I put my finger on the cone, it stops. Looks like the speaker is blown, right? Edited November 24, 2017 by 1976fenderhead Quote Link to comment Share on other sites More sharing options...
Tonteee Posted November 24, 2017 Share Posted November 24, 2017 Hmm. Speakers don't just blow. Usually something drastic has to happen. However, whilst looking for a better picture of the driver, I found this on t'other low end forum... https://www.talkbass.com/threads/trouble-with-my-gk-neo-112-ii-cab.1085139/page-7 Much food for thought here, and some checking of manufacturing stickers. 1 Quote Link to comment Share on other sites More sharing options...
1976fenderhead Posted November 24, 2017 Author Share Posted November 24, 2017 Wow, that's quite a find! I do have that number sticker! It's way past warranty though and I'm not sure it's the same issue... I don't see a loose connection and it rattles even when unplugged. The only thing I can see is that if I press either of the silver wires going into the cone, the rattling stops, but so it does if I just press the cone with my finger, I think it's just the wires pressing on the cone like my finger, same effect... Anyway, seems like I'll really have to take it to someone to have a look at it... Quote Link to comment Share on other sites More sharing options...
Tonteee Posted November 24, 2017 Share Posted November 24, 2017 If you have the bogey driver, taking it to a man will only confirm you have bogey driver, surely? Though having said that, it's possible that a repair could be effected by a competent speaker tech. They describe a fragiliy in the wire going from voice coil to chassis, this it in red, if you didn' t see the picture in the thread, to save others fishing through: So to my mind, putting your finger on the cone takes the vibration out of the cone and steadies the wire. I'd email GK and have a pop at getting a replacement / cut price driver. Failing that, it might be new driver time. Maybe an excuse for a change of brand...? All the best! Quote Link to comment Share on other sites More sharing options...
1976fenderhead Posted November 24, 2017 Author Share Posted November 24, 2017 Yeah I've emailed them trying to get a discounted driver. Let's see how it goes... Thanks for your help! Quote Link to comment Share on other sites More sharing options...
Tonteee Posted November 24, 2017 Share Posted November 24, 2017 No worries, glad to have been of some help! Quote Link to comment Share on other sites More sharing options...
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