Question about Celestion S8 Subwoofer

7 Answers

Celestion S8 Subwoofer

Hi folks, My S8 has started humming all the time, with or without the phono lead in, and in all on/off/auto positions. It's been a pretty good sub so far so I'd rather try and fix it than dump it! Could it be a coupling cap or a resistor gone high in the amp? Any help much appreciated! Oberon

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  • Anonymous Jan 02, 2008

    i have the same problem with mine it seems to be the blue relay chattering , voltages and cappies seem ok, the reason for the chatter is unknown anyone out there got a circuit diagram.

  • Anonymous Aug 08, 2008

    I have an S8 with the chattering relay issue and we are not alone - looking about a few forums it is a widespread problem.

    I got hold of the schematice for a kef psw2000 which is broadly similar and after browsing the diagram and a few forums I plan to replace the main smoothing caps and also c52, which sits after the relat and smooths the full supply voltage, it has a hard life and I suspect the 63v part that is fitted has not lasted.


  • Anonymous Sep 08, 2008

    Same issue with the KEF PSW2000. More info & circuit diagram/service manual here: http://www.avforums.com/forums/showthrea...

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7 Answers

DANGER !!!!

re: It's a problem in the grounding of the unit all you need is receptacle adapter that takes away the ground plug on the power cable.


ON NO ACCOUNT DO THIS.
If it is an 'earth' ground loop problem then this would likely solve the issue but it's unsafe as the S8 needs its earth connection to be safe in case of electrical fault. It's not 'double insulated' construction.

And if it makes the noise / hum without being connected to any other piece of kit then it's not an 'earthing' problem anyway.

I have a faulty S8 which just makes either no sound or a big hum just on its own.

Posted on Nov 01, 2008

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The relay chatter is because its getting AC from the board. I took the relay off the board and tested it with 24VDC it works fine - checking with a multimeter it seems the relay is getting about 20vDC and at the same time 8V AC ! Normally my multimeter wont read AC if its DC and vice versa - very strange! But the question is what is causing the circuit to get AC?

Posted on Mar 07, 2008

  • Dan Lodge
    Dan Lodge Jan 04, 2018

    I have the same issue. How did you fix it?

  • Dan Lodge
    Dan Lodge Jan 04, 2018

    I have the same issue. How did you fix it?

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It's a problem in the grounding of the unit all you need is receptacle adapter that takes away the ground plug on the power cable.

Posted on Feb 24, 2008

I too found my subwoofer humming after about 3 years... weird thing is i found the solution to my problem... i turned on my sub, it hummed, i disconect the cable from my tv, IT STOPS!!! i am going to radioshack tomarrow to pick up a device that connects my cable to my tv to stop the interference

Posted on Nov 13, 2007

If the sound source is on a different circuit or plug it produces some kind of a loop (dont know the technical name) Go to radio shack and get a ground loop disrupter that goes on the audio cables right before the speaker and it eliminates that hum.

Posted on Oct 05, 2007

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When you say check the caps what do you mean? I also have a Celestion S8 Sub that is about 3 years old and has just started doing this exact same thing. Celestion say they'll fix it for about £50. Could you be a bit more specific for those of us that don't know much about electronics :o)

Posted on Nov 02, 2006

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I would check the electroltyc caps in the power supply They general are in the first part of the power supply and there will be two of them . What they do is filter out transformer hum and help stabalize the circuit. I am not saying this is absolutely the problem but the capcitors are relatively inexpensive, Easy to change. And have a habit of going bad after a couple of years in use.

Posted on Sep 03, 2006

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Posted on Jan 02, 2017

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1 Answer

I get an intermittent loud hum using NAD AV316 amplifier, with stereo speakers(B connection) with phono input from Dual 606 turntable. Hum increases/changes when tone arm on turntable is touched.


The hum of course is the 60 cycle line AC voltage. Make sure that the routing of the AC power plug is as distant as possible from the stereo RCA cables.

The most likely problem is the connection of the phono cartridge to the wires in the arm. These connections usually are silver plated and become oxidized creating a bad connection. Remove the cartridge and using a fine eraser polish the connections. There is a ground connection that makes the five wire connection. Be super carfull these terminals are very easy to break

The phono connections to the stereo is very low voltage subject to interference. The connection to the magnetic pickup at the tone arm is low impedance and is inductive. Any poor connection between the cartridge up to the AV316 will produce this hum. Continue to check connections and swap cables with a known good to resolve.

I have switched the left and right cables to ensure that the cable is not the problem.

Hope this helps?

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Dryer ran without any problems and suddenly will only click when the start button is pressed, and will only click in certain positions. Clicks or cycles on Auto Dry Regulare and Time Dry/Air Fluff but not...


Sorry to read about your problem, I hope this helps you out.

I cant hear your growl/hum. Either your drum belt has broken, or you have a defective motor.

I tried to help you. Please help me and Rate/Vote on my response. We take the time to answer your question's. take the time to rate us.Thanks and good luck

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Is there a wiring diagram for the nikkai EAPA450 Amp


Hi, if you still need a photocopy of instructions email me [email protected]

If you want instructions in brief this involves POWER CONNECTIONS, PHONO LEAD & SPEAKER CONNECTIONS:

POWER (At the same time when routing these wires, I would connect the PHONO LEADS from the car cd player to the amp, if your car cd player only has 1 preout (1red & 1 white) then you will need two phono splitters, a female to 2 males. Phono leads carry the unamplified sound from cd player to the amp):
~ Permanent 12V+ (Thick lead that is fused direct from battery all the way to the amp, wire must be 20a to 30a +, hence 1cm diameter wire, known as AWG8, Maplin sell cheaper kits then most)
~ Amp REMOTE (A thin insulated cable (5a is OK) from car cd player amp remote wire, this turns the amp on when the cd player is on, if your car doesn't have an amp remote wire, suggest nearest ignition supply or seperate switch that you turn on when you want to turn on the amp)
~ GrouND 12V- (Insulated lead (20a to 30a) to nearest part of unpainted car chassis such as interior panel screw hole, instead of an insulated cable all the way from the batery, this is common practise.

SPEAKER:
Each speaker has a - negative & + positive, these must connected correctly. The amp has 4 channel, 2 channel labeled as front, 2 channels labeled as rear. Using speaker wire, connect cable from amp to speakers. Note: Ensure the speakers being connected only receive sound from the amp (Not cd player as well, as would damage players or at the very least impair sound)
The amp has a feature called bridgeable this means a sub 8" or 10" sub can be powered by 'bridging' two channels. For example there are 2 ways to bridge power a Sub on the NIKKAI EAPA450:
i) Sub speaker wire positive + to channel RL and Sub speaker wire negative - to channel RR.
OR
ii) Sub speaker wire positive + to channel FL and Sub speaker wire negative - to channel FR.

Switches:
~ Bass boost, meant to be on for a channel if using sub, otherwise off.
~ X-over mode adjust hi/lo frequencies, only work if both x-over switches are on! Then adjust switch frequency knob, until it sounds right.
~ Gain (Volume knob) adjust volume knob up or down, until it sounds right!

NOTE:
You will need patience! many hand tools and parts such as: Wiring kit, fuse holder 20a/30a, Phono leads, speaker cable, Fork/ring connectors, wire strippers, wire cutters, set of screw drivers, also ueful to have zip ties to tdy excess cable and 'P' cable clips to tidy speaker wire to shelf, etc.

OK

Any more questions just email me [email protected]

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could try fitting a serpresser as like cars do
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Broken lead needs to be replaced


I have been hiring technics for years and this is a recurring problem, you have to replace the phono connection or worse the whole lead, sorry

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Humm


where is the ground wire from the turntable connected to ? Ensure that is is connected to the phono pre-amp's ground.

Is the turntable sitting on top/near any other equipment ? Try changing the position and see if the hum reduces. If yes, then it is likely that it is picking up hum from a mains transformer.

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