Question about M-Audio StudioPro 4 Main / Stereo Speaker

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No Power I've had these monitors for a few years. All of a sudden, they will not power up. I've switched power supplies, surge protectors and tried running them direct into a wall source. No dice. I've got no noise, hum or other indication that they are receiving power. LED does not light up... Should I junk these or try and get them fixed?

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Re: No Power - M-Audio StudioPro 4 Main / Stereo Speaker Speakers & Subwoofers

Is there fuse on these monitors?

Posted on Oct 08, 2007

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My subwoofer keeps poping and then stops working

Sounds like you blew the speaker! The amp is sensing the voice coil is connecting to the speakers magnet or iron core and is going into a safe mode. It is possible to blow the coil even when the sub has a built in amp.

First make sure that you have the gains properly set ans not all set to their maximums. Second, disconnect signal to the sub then unplug the power for a few minutes. Third, plug the sub into a source of power on a different circuit using a surge protector.

Does the speaker make any popping at the time it powers up? If so you have a amp problem. If there is no sound produced, connect it back the the system using a different signal cable. Does the speaker now pop again when sound is produced. If so the speaker has failed. Contact a Velodyne repair facility.


Aug 10, 2010 | Velodyne CT-80 Subwoofer

1 Answer

I have a pioneer 8" 100 WRMS ported sub woofer. Last night we had power surge and this morning my sub woofer quit. All other componants are fine. I have a very good surge protector, so I do not know if the...

Plug the speaker to a known good output from the other components. if it works, then it's your output, if it does the same thing, then it's blown.

Feb 16, 2010 | Speakers & Subwoofers

1 Answer

My onkyo subwoofer does not turn on the green ligth is not on, what could it be? is a swk-200

My Onkyo S/W did the same thing untill I unplugged it from the surge protector that all the other A/V devices are plugged into. I plugged the sub into it's very own wall recepticle with it's very own new surge protector. Maybe cleaner power is the answer.

Feb 12, 2010 | Onkyo SKW-200 Subwoofer

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MTX SW2 Power Surge Damage?

Try the fuse first then if no problems alls good , but if it still hums it could be the crossover board inside , if you love your sub like i love mine you will just replace the crossover if need be . Smirf 617

Jun 12, 2009 | MTX SW2 Subwoofer

1 Answer

JVC TH-C30 Digital Theater System

If there is no power at all, then try bypassing surge protector, check power cable, and check if power cord is fused.

If unit has power but does not start, then it is on protection.

Protect mode will kicking whenever a fault is detected.

Causes that can start protect mode are:

Electrostatic harges on internal circuits.
Leave the unit unplugged for power for one hour or so, this will allow discharge.

Bad speaker wiring.
Check speaker wiring, try unplugging and plugging back, or start after removing one speaker at the time.

Internal fault.
Internal fault is the natural cause for protect mode. If all the above did not work, then the problem is a blown component or an internal fault. In this case the unit must be taken apart , tested and repaired by an experienced person.
If the unit is less than one year old, or if you want to get service, call Sony at the phone number listed on the product documentation.


Mar 11, 2009 | JVC SP-PW100 Subwoofer

3 Answers

Bose cinemate will not power on. light stays red?

Make sure your system is not plugged into a surge protector. Sometimes a surge protector will foul the system up, don't know why. lol. I fought with my system for 3 hours trying to get it to work, then moved it from my surge protector to the wall and it came on. If that doesn't work, try disconnecting the receiver module itself, wait 60 sec, then plug it back in. If that still does not solve the problem, I would suggest calling Bose Customer Service..

Jan 25, 2009 | Bose Cinemate Digital Home Theater System...

2 Answers

Unit will not power on

Unplugging it (for only a couple of min.) worked for me.  Press AUX, then ON.  Green light came on after I did these steps.

Jun 28, 2008 | Bose Cinemate Digital Home Theater System...

1 Answer

Thump at the time of shutoff

The amplifier in the sub as with any other amplifier has a capacitor in it. Essentially a battery that holds a charge. When you trun things off such as subs or amps with a powerstrip instead of the intended on off button, the power supply has been cut, but the capacitor is still energizing the unit. So it catches the noise in the line.

Mar 07, 2008 | JBL PB10 Subwoofer

1 Answer

Thumping when not hooked up

First thing to check are signal cables but broken fuse telling me that problem is 99% in sub power supply unit or the amp.If you have a voltmeter and if you KNOW how to do it dissasembly it and check DC voltage on a speaker conntacts.If there is any DC present your amp is worn out.But this can be VERY DANGER because 220/110V is there so if you are not 100%sure that you can do it DON'T!!!

Feb 12, 2008 | JBL SCS125A System

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