Question about Dahlquist QX-4A Main / Stereo Speaker

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Dahlquist PDQ 1200 subwoofer

I had an electronics guy hook up a new receiver and then say my subwofer fuse was blown replace it with a "larger" fuse. The unit began smoking and had just a humm. The transformer was very hot. I need to know if this is salvageable and where I can get a new transformer if so.

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  • wmac500 Feb 23, 2009

    Just came back from vacation, plugged it in an got a loud hum. Replaced the fuse twice, same thing.

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3 Suggested Answers

jerryg50
  • 1640 Answers

SOURCE: Velodyne subwoofer

First make sure that the cables are properly connected up. Make sure that the output of the amplifier feeding the sub is working properly and has no faults.

If the above is okay, it is possible that the power supply in the sub, and or the output stage has a failure. In this case the sub will require shop service to have it working again.

Jerry G.

Posted on Jul 03, 2008

  • 1 Answer

SOURCE: Blew fuse on Dalquist PDQ-1200

My sub shows this a a 240v / 1amp slo blo fuse

Posted on Apr 30, 2009

  • 2 Answers

SOURCE: blown fuse on sub woofer

1 amp 250-volt from radio shack #270-1021

Posted on Jul 24, 2009

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1 Answer

No sound from subwofer


If it is a powered sub, a fuse may have blown inside or the amplifier may have failed

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Our ten year old paradigm ps 1200 subwoofer does not power up, although it is plugged in and properly connected to the receiver. Why is this? Is it a lost cause?


Disconnect the power, pull the amplifier out by undoing the screws that hold it in.
When you pull it out, look closely towards the top there is a little 1.8A fuse. It probably has blown.
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I am trying to run speaker wires to receiver. wires from subwofer


hello their, running speaker wires that are a thicker gauge will allow you less distortion as well as more power. when the wires are extremely small, it;s like pushing air threw a very small tube, the larger the tube the less electrical resistance you will encore, their is also a tip their, if you have a 1,200 watt mono single channel amp running @ 1 hertz you would be better off running thick ground and power wires, threw a distribution block before the fuse to the battery, the fuse is actually necessary cause 75 amp's running direct threw a wire is dangerous if not properly fused. fires can start, as well as damage to any electronic equipment. please use proper fusing (example taking a wire and briefly touching ground to power will destroy and violently ark a wire apart.)

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Fuse on subwoofer keeps blowing


Subwoofers draw a tremendous amount of power. With the amount of heat generated by amperage flow and the movement of the voice coil, you may have burned out the coil. Do a resistance check across the coil. Easy check? Temporarily attach another speaker to replace that one. Use LOW VOLUME and slowly work the vol up,and, if the fuse does not blow, it's the other speaker.

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Blown fuse on sub woofer


1 amp 250-volt from radio shack #270-1021

Dec 28, 2008 | Dahlquist QX-4A Main / Stereo Speaker

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