Author Topic: Blown speaker drivers, is repair possible?  (Read 509 times)

Offline Grinder man

  • Trade Count: (0)
  • AVForums Member
  • *
  • Posts: 47
Blown speaker drivers, is repair possible?
« on: December 11, 2017, 11:25:13 PM »
So on Friday morning my wife switched on the radio, our 2 year old had turned the volume knob to the max and it switched on to a slightly off tune radio station. I clinched at the sound but forgot about it till Saturday when I switched it on again. The right speaker is noisy, distortion like sound but at all levels. I traced it down to the midrange and tweeter, if I disconnect them the noise is gone.

So the speakers in question is pioneer hpm-1100's and they have polymer graphite cones. Replacements aren't available anymore and pop up on eBay from time to time.

So my questions are:

What is typically the mode of failure? The cone coming loose from the driver?
Is it repairable?
If so who in Gauteng or is it diy?

If I can fix it I can always look for replacements if they pop up later.

The cones on the speakers are known to be extremely brittle so I don't just want to trust them with anybody. Also the woofer (15") foam has light cracks you can only see when their moving, is it worthwhile to refoam them?

I'm really fond of these speakers and would like to keep them standard.

Thanks
Spin the black circle

Offline Audioholic

  • Trade Count: (0)
  • AVForums Member
  • *
  • Posts: 37
Re: Blown speaker drivers, is repair possible?
« Reply #1 on: December 12, 2017, 02:00:06 PM »
Oh no, sorry to hear. The joys of em 2 yr olds! I had a similar experience where my 2 yr old turned up the vol on my SA-608 to full. When i switched it on, i heard the 'white noise' through the speakers. On investigation, i found the vol turned to max. The speakers were fine but the one channel played low after that - had to get the amp refurbished.

I'm sure you've diagnosed the fault correctly, but just out of curiosity, have you tried swapping your left and right speakers just to confirm the amp channels are okay?

WRT the speakers, I can't answer your all your questions in my limited technical know-how, but my thoughts as follows:
1. Is the tweeter or the polymer super tweeter distorting? If its the tweeter, I would also get it recoiled by a speaker expert while you wait for a sensible buy on ebay. Don't know if the super-tweeter is repairable. Perhaps someone here could shed some light...
2. Woofer surround - i've seen HPM surround repair kits on ebay...perhaps purchase one of those and find a reputable speaker repairer in Jhb to do the very delicate operation - nothing beats an experienced hand for this. (Sorry i only know of a speaker repairer in Dbn).

Keep us posted of the progress.
Stereo: Pioneer, pioneer and more pioneer, Sonor Audio, Denon, Energy
HT: Onkyo, Taga Harmony

Offline Katji

  • Trade Count: (+1)
  • AVForums Veteran
  • ***
  • Posts: 916
    • soundcloud
Re: Blown speaker drivers, is repair possible?
« Reply #2 on: December 12, 2017, 02:12:38 PM »

Offline vleisman

  • Trade Count: (+11)
  • AVForums Veteran
  • *****
  • Posts: 1,497
Re: Blown speaker drivers, is repair possible?
« Reply #3 on: December 12, 2017, 02:36:50 PM »
Merle.  Highly recommended.  Famous.  https://www.avforums.co.za/index.php/topic,67113.msg811365.html#msg811365

This is more of a de-recommendation than an endorsement. I tried taking a Tannoy driver to Merle but the traffic just defeated me, roadworks around Monte Casino made the traffic more brutal than usual - I ended up going to Innovative Speaker Repairs in Germiston a few days later. I would NOT recommend them, my driver was in better shape before the 'repair'. I complained and was offered a full refund, which never happened, despite a few reminders. Without actually having used her services, I'd rather go with Merle and use a courier.

Offline gavinbirss

  • Trade Count: (+1)
  • AVForums Veteran
  • *****
  • Posts: 1,172
Re: Blown speaker drivers, is repair possible?
« Reply #4 on: December 12, 2017, 02:46:11 PM »
This is more of a de-recommendation than an endorsement. I tried taking a Tannoy driver to Merle but the traffic just defeated me, roadworks around Monte Casino made the traffic more brutal than usual - I ended up going to Innovative Speaker Repairs in Germiston a few days later. I would NOT recommend them, my driver was in better shape before the 'repair'. I complained and was offered a full refund, which never happened, despite a few reminders. Without actually having used her services, I'd rather go with Merle and use a courier.

What was the symptoms and condition before repair? Just out of interest sake. It is a dual-concentric driver?
The refund would have covered the repair but it it is still much less proportionally to the value of the driver?

These services are truly reputation based but there is still risk, perhaps some are beyond repair? or the repairer is inexperienced in the particular topology?

Offline vleisman

  • Trade Count: (+11)
  • AVForums Veteran
  • *****
  • Posts: 1,497
Re: Blown speaker drivers, is repair possible?
« Reply #5 on: December 12, 2017, 02:58:01 PM »
Gavin - its a long story,  short version.  Dual concentric driver the plastic cone had split and been glued. Worked fine but bothered me.  Kent gifted me some spare parts.  I wanted the mended plastic cone replaced with an unmended one. Driver came back and he'd cut both the replacement and old cones out and glued the 'new' cone in its place. When I complained he said the repair wasn't possible without additional parts.  Never advised me of that before butchering took place.  How he imagined id be happy with the work is a mystery. So now I have no more spare parts and a worse condition driver (cosmetically speaking).
There was no parts cost, refund was only for the labour.

Offline Katji

  • Trade Count: (+1)
  • AVForums Veteran
  • ***
  • Posts: 916
    • soundcloud
Re: Blown speaker drivers, is repair possible?
« Reply #6 on: December 12, 2017, 03:00:08 PM »
Quote
I tried taking a Tannoy driver to Merle but the traffic just defeated me, roadworks around Monte Casino made the traffic more brutal than usual [...]
I've seen some photos that Merle has posted of bakkie loads of drivers. Dunno whether she collected them, or people brought bakkie loads to her.

Offline KOD

  • Trade Count: (+2)
  • AVForums Member
  • ***
  • Posts: 177
Re: Blown speaker drivers, is repair possible?
« Reply #7 on: December 12, 2017, 03:15:39 PM »
Merle may be a long way out but the results are without doubt worth the effort.
Grundig/Eddystone/B&O/Montgomery Ward/NAD

Offline vleisman

  • Trade Count: (+11)
  • AVForums Veteran
  • *****
  • Posts: 1,497
Re: Blown speaker drivers, is repair possible?
« Reply #8 on: December 12, 2017, 03:58:12 PM »
Just to be clear - nothing against Merle, by all accounts her work is excellent. I don't think she controls the traffic so can hardly complain about that. Perhaps I tend to colour-in my stories a bit too much.

My beef is with Innovative Speaker Repairs and purely my opinion, if you want to use them, go right ahead. Repairing a 5cm cut by making a much longer cut all along the circumference of a speaker cone isn't my idea of quality work. If you can't do the job with the resources available then say so, don't just go ahead and pretend everything is hunky-dory...and then 'forget' to pay the agreed upon refund. The refund isn't a major deal, the damage is done. Just mentioning it because I think it's relevant and sheds light on the man's standards. I wouldn't like to read about GrinderMan or anyone else having a similar experience without at least making them aware of what I found.

Offline Hi-Phibian

  • Commercial Member
  • Trade Count: (+39)
  • *****
  • Posts: 11,232
  • I really prefer email, see my banner for address..
    • Croak Audio Exploration
Re: Blown speaker drivers, is repair possible?
« Reply #9 on: December 12, 2017, 04:04:40 PM »
There are many folks in the speaker repair game.  Most of their work comes from a non audiophile populous. 
Recommendation of the 3 odd Gauteng repairers, Merl, Willie and Thomas is as much a de recommendation for most of the others. 

Sad to hear Vleisie.







[Anyone who thinks that wealth is measured in money is blind and narrow minded.  Wealth is obviously measured in turntables and records.]
Proprietor of Croak Audio Exploration.
Fair, not crazy, cash paid for turntables and tonearms from Rega, Linn and Thorens.          http://www.croak.co.za

Online chrisc

  • Trade Count: (+92)
  • AVForums Veteran
  • *****
  • Posts: 8,570
  • Cape Town Hi-Fi Club - listen with your ears
Re: Blown speaker drivers, is repair possible?
« Reply #10 on: December 12, 2017, 04:32:04 PM »
Not sure where you live, but there is a marvellous speaker repair person in Cape Town - name of Riaan Louw of Resonant Frequency

Offline Audioholic

  • Trade Count: (0)
  • AVForums Member
  • *
  • Posts: 37
Re: Blown speaker drivers, is repair possible?
« Reply #11 on: December 14, 2017, 10:30:24 AM »
The suspense is killing me Grinder....any progress with the fix?
Stereo: Pioneer, pioneer and more pioneer, Sonor Audio, Denon, Energy
HT: Onkyo, Taga Harmony

Offline Grinder man

  • Trade Count: (0)
  • AVForums Member
  • *
  • Posts: 47
Re: Blown speaker drivers, is repair possible?
« Reply #12 on: December 14, 2017, 10:58:56 AM »
Sorry for the delay, year end run around is keeping me busy.

I never thought of checking the amp channel as the noise originated from the 2 specific drivers and these sounded fine, I will however still check it, hopefully tonight.

Bad timing as we have a vinyl Christmas braai on Saturday,  luckily I have some less capable back ups.
Spin the black circle

Offline Kent Kassler

  • The Undertaker
  • Trader
  • Trade Count: (+57)
  • *****
  • Posts: 9,165
Re: Blown speaker drivers, is repair possible?
« Reply #13 on: December 14, 2017, 11:32:54 PM »
So sorry to hear Vleisman......I have almost given up on getting anything other than surrounds done here in CT.....I have John order the right stuff and do the job for me.....I have seen too many truly hideous repairs and outright butchered drivers by the locals here.....surrounds glued and cut and joined on top of big money 7" Dynaudio drivers which should have been glued beneath......I gambled,praying that this was the only sin as it can be reversed but no......spiders were utterly hacked!.....replaced with random crap.....they were so stiff that bass was nothing but a dream.....I won't mention names but the instant that suggestions of "spider renewal" come up.....run for the hills I tell you!
Audiophile Sound Sommelier Extraordinaire....aka Manic Depressive Temporary Void Filler Deluxe.

Offline Kent Kassler

  • The Undertaker
  • Trader
  • Trade Count: (+57)
  • *****
  • Posts: 9,165
Re: Blown speaker drivers, is repair possible?
« Reply #14 on: December 14, 2017, 11:37:00 PM »
I have found someone else who has done two beautiful jobs for a friend....coil rewire on two different drivers,brilliant work and neat as a pin.....I have handed him three jbl's for refoaming and if I am happy I will gladly offer details to Capetonians.Fingers crossed.
« Last Edit: December 14, 2017, 11:39:03 PM by Kent Kassler »
Audiophile Sound Sommelier Extraordinaire....aka Manic Depressive Temporary Void Filler Deluxe.