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Thread: Speaker crackle sound fix ?
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18th February 2018, 10:44 PM #16
If you can, see if you can borrow a reasonably new speaker from someone, even a small one - this would obviate having to get a 3mm-6mm converter for the headphones. You can plug it in to either channel in turn and see if you get the crackling. If it's still there then the amp is buggered and frankly not worth repairing unless it's a REALLY high spec amp from the period, with gold contacts and the like, or unless the repair can be done for <$100 . It may just be a case of dry joints, which may or may not cost too much to repair (pretty sure I know what the Tech will say though )
If it's not still crackling then it's the speakers which may or may not be worth repairing (new cones can be put into old boxes).
My money says it's the amp.....
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19th February 2018, 07:45 AM #17SENIOR MEMBER
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Sometimes dust can get onto contact inside potentiometers (volume, base, treble etc) and cause clacking. Especially noticeable when trying to adjust them. Dust can also be an issue with switches. With the amplifier off , try adjusting all to knobs and switches through their full range several times to see if that helps.
If only one side that is crackling, try swapping speaker leads over to see if crackling stay with one speaker or swaps to other speaker I.e. narrow down a speaker or one channel of the amp.
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22nd February 2018, 11:41 AM #18New Member
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As Pete 57 said, it could be the pots. I would turn the amp off and just go to town spinning them back and forwards. When you think you have done it enough, do the same number again. I work with commercial PA amps on a daily basis, you would be surprised how often this cures distortion and crackles.
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23rd February 2018, 02:53 AM #19New Member
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I'd echo Pete57 and bradonj, but then power up again, and turn the volume and other pots up and down, gently at first. And with the volume low until you establish you're not sending loud crackles to your speakers. (Having said that, those Tannoys are pretty robust!) If the problem is with the pots (or switches) you'll hear it diminish as you continue to operate the knob/switch. Don't forget to check all other plugs and sockets, just by unplugging and replugging a few times, BUT with the volume at minimum!!.
My money is on poor contacts [ie those pots and switches] (but possibly a dry solder joint) in the amp. Look for some Contact Cleaner - any brand - intended for use on electronic equipment and spray some on those controls. Online is cheapest [here in UK anyway]! (You could try a little drop of 3-in-one light oil as a quick-and-dirty fix, if you can reach a hole in the noisy pot!)
Follow other advice above to find out where the problem is occurring, changing only one thing at a time.
If it is the speakers, and you've remade the cable connections at the back [eliminating them] I'd check the internal wiring very carefully. Where a wire is connected to terminal, try to make a tight physical connection before soldering, as inevitably there will be vibration in your speaker.
If you're sure it's in the speaker, and you've done all the above, then I would check all the solder joints on the crossover. If you're not familiar with soldering printed circuit boards, I'd take it to someone who is. It could, of course, be a faulty component on the crossover, but if the noise is on both channels, that would be quite a coincidence!
Good luck!
John
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23rd February 2018, 07:50 PM #20
Thanks for the good advice Gents. I'm going to give them a go . I haven't touched it for a week one reason is I've been busy.
Another reason is, I cant wait to change the position of the cabinet full of gear, amp and all . I'm sick of being down on the ground
on my knees in the back of the cabinet. Never liked it, and always liked the look of technician types where they had all the gear at desk to height.
Whether it be audio or computer stuff.
I cant have it all spread out like I've seen, but I can raise the cabinet where it can be accessed at standing
height and it has to be able to be spun around to get at the back and at the same time be just to the right side of my work bench .
Another thing I went and did was buy another Amp . Ill play with the first one to see if it gets better first.
The new one coming is the same as I first bought with the speakers in 1981 /2 A Yamaha A-560.
Another second hand buy but the Guy sounds like he knows his gear and he says its been checked and is working well .
Rob
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24th February 2018, 03:11 AM #21New Member
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25th February 2018, 10:22 AM #22
I have seen a couple of instances where the voice coil failed. In one case the cause was running the amp to loud for too long and it "cooked" the voice coil. When I took it apart the insulation had clearly burnt and the voice coil was distorted. In the other case the speakers were stored in a shed for a number of years and moisture got into the speaker and caused corrosion. Although you can get the speakers re-coned it is not worth it in most cases.
In your case you need to isolate the source so put the speakers on another amp (really any audio source will do) or use another speaker on the same amp.
The cause of the crackling can be the following in decreasing order of likleyhood.
1. Switches on the amp. Selection switch, source switch, speaker switch etc. This one is pretty easy to tell. If you wiggle each switch you should see a change in the crackling. Spray contact cleaner on the switches as you move them back and forth.
2. Volume, balance, tone controls. Again easy to diagnose. If the crackling gets worse as you adjust them then this is the cause. If they operate without any additional crackling then they are fine. Remedy is again contact cleaner. They can wear out over time with a LOT of use in which case they will have to be replaced.
3. Loose connections. This is the hardest to diagnose since the loose connection could be anywhere. If it is in both speakers then the loose connection is most likely in the audio cables between the source and the amp or the amp and the speakers. replacing, cleaning or re-terminating the cables will fix this.
4. Speaker voice coils as mentioned above. Remedy is new speakers.
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