Question about PSB Alpha Sub Zero Subwoofer

2 Answers

No LED light on PSB Alpha Subzero-i and keeps blowing fuses.

I get no green light when I plug in and turn on the sub. Used the replacement fuse - no cigar. The sub uses 1.6a fuses, went to hardware store and bought 2 however they were only 1.5a (all they had), both blew instantly upon turning the power on.



Posted by on

2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 2 Answers
Re: No LED light on PSB Alpha Subzero-i and keeps blowing...

Go to a 2 amp fuse. There's obviously too much juice for a 1.6 amp fuse to handle, so graduate in small increments the load capacity of the fuse. After replacing, slowly increase the volume to where the source material is at a comfort level, and see if it can handle the juice.

Posted on Sep 22, 2008

Re: No LED light on PSB Alpha Subzero-i and keeps blowing...

Others have had similar problems with the amp on this model. There is probably a circuit design error which causes some components to blow and as far as I've read, fixing it (or replacing the fuse) won't make the problem go away for long. Try contacting PSB or the retailer.

Posted on Jan 06, 2008

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Fuse replacement

The fuse is integrated in hte AC socket. You'll need a small screw driver to pry up the part that talks about the power requirements. Check the online manuals for more details.

Aug 24, 2013 | PSB Alpha Sub Zero Subwoofer

1 Answer

KLH ASW8 Powered subwoofer keeps blowing 3A-250V fuses

The transistors at the output stage of the sub amplifier circuit might be shorted so each time you power on, the circuit draws a very high amount of current which causes the fuse to blow. It's definitely a problem with the circuit so using a higher current rated fuse would probably just result in damaging the amp even more. You should ask a qualified electronics technician to take a look at it. I hope you can fix it.

Oct 17, 2012 | KLH ASW8100 Subwoofer

1 Answer

I have a PSB subwoofer 6i and the fuse keeps blowing every time it is renewed.

I have two in my shop right now. The power supply is to blame with these two. the manuf. has used some type of epoxy to hold down components before wave solder. This is in the high volt side of the switch mode power section right on top of the bias components . This epoxy breaks down and becomes resistive to the components below causing a direct short. There was a company years ago that had this problem with the same epoxy. A real stupid move then and a real stupid move now. If your power board is burned due to this problem your unit may not be able to be serviced. Solution is to change the supply. Of course the supply is 3/4 the cost of a new sub. Another real stupid move.
This opinion was provide by THE GREAT OZ.

Mar 29, 2011 | PSB Image Sub Sonic 6i Subwoofer

1 Answer

I have no green power light on my subsonic 5i which screws do i remove to replace a fuse inside

Make sure you the plug eorks before you do anything. Plug in a lamp or something. The fuse is inside where you plug the input.

Sep 01, 2010 | PSB Alpha Sub Zero Subwoofer

1 Answer

It keeps blowing fuses - two 12 inch cls subs 1

sounds like the audio stage riving the channel has a short circuit on it.need to go through the amp stage

Jul 16, 2009 | Cerwin Vega CLSC-12S Subwoofer

2 Answers

Klipsch ksw subwoofer wont power on

The power supply switching transistors are likely fried. Dangerous high voltages involved. I would remove the plate and send it to Klipsch for repair.

Jan 16, 2009 | Gem Sound SUB-650M Speaker

2 Answers


the correct size fuse is based on amps, not volts. The correct fuse rating should also be displayed on the chassis of your sub, if in doubt take the original one to an electrical shop and let them identify it for you.

Nov 26, 2007 | Cambridge Soundworks BassCube 12 Speaker

Not finding what you are looking for?
PSB Alpha Sub Zero Subwoofer Logo

Related Topics:

1,435 people viewed this question

Ask a Question

Usually answered in minutes!

Top PSB Speakers & Subwoofers Experts


Level 3 Expert

4518 Answers

Michael Edwards
Michael Edwards

Level 1 Expert

53 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Are you a PSB Speaker and Subwoofer Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides