Phil Starr Posted February 27, 2018 Posted February 27, 2018 It does sound like a problem with the voice coil I'm afraid, speakers can be fitted with new coils and cones but it can be a substantial proportion of the cost of a new driver. Wembley speakers http://wembleyloudspeaker.com/ or Blue Aran do this sort of repair. Before you give up on this have a look to see if anything is loose on the speaker or if there are any tears in the cone itself, they could be repaired at home. Also look at the flexible wires that connect the speaker terminals to the cones/coil. I've had problems with them coming away in old Fanes. Yes pushing a speaker cone with a cup or a pint mug is safer as it spreads the load, be gentle. 1 Quote
stevie Posted February 27, 2018 Posted February 27, 2018 Agreed. And also try playing through the driver outside the cabinet (at a low volume) just in case something in the cabinet is causing the problem. Not very likely, but not impossible. Quote
fleabag Posted February 27, 2018 Author Posted February 27, 2018 17 minutes ago, SpondonBassed said: The push test should be done with even pressure by the way. There is no value in doing the points of the compass. 12 minutes ago, stevie said: Exactly. The idea is to simulate the back and forward movement of the cone. As Spondon says, you need to apply even pressure to the cone to make it move in and out at a perfect right angle. The voice coil behind the cone is moving in a very narrow gap, and will scrape against metal if you apply uneven pressure - even on a good driver. I think Phil Starr once suggested using a cup to carry out this test. Thanks chaps - will have another go using the cup method. I did a bit of googling too, and someone mentioned that a possibility was torquing the driver mount bolts in an ueven fashion, slightly warping the basket. Any ideas on that ? Quote
fleabag Posted February 27, 2018 Author Posted February 27, 2018 (edited) 16 minutes ago, Phil Starr said: It does sound like a problem with the voice coil I'm afraid, speakers can be fitted with new coils and cones but it can be a substantial proportion of the cost of a new driver. Wembley speakers http://wembleyloudspeaker.com/ or Blue Aran do this sort of repair. Before you give up on this have a look to see if anything is loose on the speaker or if there are any tears in the cone itself, they could be repaired at home. Also look at the flexible wires that connect the speaker terminals to the cones/coil. I've had problems with them coming away in old Fanes. Yes pushing a speaker cone with a cup or a pint mug is safer as it spreads the load, be gentle. I'll whip the driver out next and check those. I know a new driver from BA is about £118 , but for a repair, when you factor in postage each way for a 17 LB + driver , then repairs, i cannot see this as being economical Edited February 27, 2018 by fleabag Quote
SpondonBassed Posted February 27, 2018 Posted February 27, 2018 2 minutes ago, fleabag said: Thanks chaps - will have another go using the cup method. I did a bit of googling too, and someone mentioned that a possibility was torquing the driver mount bolts in an ueven fashion, slightly warping the basket. Any ideas on that ? It's no harm to undo the fasteners and redo them in the order of ; 1, 5, 3, 7, 4, 8, 6 and 2. Quote
stevie Posted February 27, 2018 Posted February 27, 2018 6 minutes ago, fleabag said: I did a bit of googling too, and someone mentioned that a possibility was torquing the driver mount bolts in an ueven fashion, slightly warping the basket. Any ideas on that ? A definite possibility, particularly with a pressed steel chassis like yours. Which is why you should try the driver outside the cabinet. Quote
fleabag Posted February 27, 2018 Author Posted February 27, 2018 Right chaps - did the cup method, couldn't hear much, maybe a slight whoosh, but nothing like the scraping heard before. Took the driver out, checked for obvious splits / damage / damage to thin coil wires, and all ok. Tried the cup method again and .... silence ?? Quote
fleabag Posted February 27, 2018 Author Posted February 27, 2018 PS chaps - thanks to all for chipping in quickly at this late hour. Appreciated muchly Quote
SpondonBassed Posted February 27, 2018 Posted February 27, 2018 Sorry I couldn't be of more help. Good luck with it. Quote
stevie Posted February 27, 2018 Posted February 27, 2018 8 minutes ago, SpondonBassed said: Sorry I couldn't be of more help. Good luck with it. Yes, likewise. It does look like your driver might be OK. Quote
fleabag Posted February 27, 2018 Author Posted February 27, 2018 Ok, i'll stuff it back in the cab, but rotate it 180 degrees, and then do a proper torque sequence as mr spondon noted and see how things go Quote
fleabag Posted March 1, 2018 Author Posted March 1, 2018 (edited) Bingo - tried it outside cab first No scratchy, no crackly. What is all that about then ? I can only think that the basket was slightly twisted due to uneven torquing of retaining bolts. But whatever it was, its gone. Cab sounds very clean, with a hint of warm, even down to big flappy E on a EUB. No farty, no boomy. Its probably a 50 Lb + cab, but i can live with that. Edited March 1, 2018 by fleabag 1 Quote
SpondonBassed Posted March 1, 2018 Posted March 1, 2018 Great news. I hope you get good use from it now. It looks reet smart like. Quote
fleabag Posted March 1, 2018 Author Posted March 1, 2018 TVM Its getting a workout as i've got Art Garfunkel , John Martyn , Vaya Con Dios and other tracks to learn Quote
RichardH Posted March 1, 2018 Posted March 1, 2018 Phew! I've been on tenterhooks with everything crossed for you. Excellent stuff! WIth a beast of a 15" driver it was never going to be super lightweight, but at least it's a lot lighter than the old one! Quote
fleabag Posted March 1, 2018 Author Posted March 1, 2018 Cheers HRH Yep, bottom end is where i roll. And so does this cab. It doesnt buzz or vibrate, and with the crackle gone, we have a winner ! Buy yourself a pint and i'll send Speckled Jim over with a £5 note Quote
fleabag Posted March 1, 2018 Author Posted March 1, 2018 Cheers MBA I'm liking it. I thought i'd end up with a boxy bonfire cab, but the opposite is true. I've bought meself a pint Quote
fleabag Posted March 2, 2018 Author Posted March 2, 2018 (edited) Its a pity ya cant buy this stuff by the square metre. 7.28 Metre roll and did nearly the whole cab with a square metre. Only 6.28 metres left Edited March 2, 2018 by fleabag Quote
SpondonBassed Posted March 2, 2018 Posted March 2, 2018 Is it rock wool? In any case, I am sure you will find a new home for it in the 'hood. Quote
fleabag Posted March 2, 2018 Author Posted March 2, 2018 Its probably similar. Its called Knauf but it doesnt seem itchy at all Quote
stewblack Posted March 2, 2018 Posted March 2, 2018 So glad you got it all sorted. Looks the business and it now sounds the business too! Quote
fleabag Posted March 2, 2018 Author Posted March 2, 2018 (edited) Just remembered - totally over the top Edited March 2, 2018 by fleabag Quote
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