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Cambridge Soundworks Basscube 12S only makes pulsing buzz noise

When I turn on the sub, it makes a very loud pulsing sound, regardless of the output level, regardless of whether I have the receiver outlet wire plugged into it or not. It does not matter what outlet I plug into in the house. In the past, it has worked just fine and only when I hadn't used it for a few months then turned it on did it exhibit this. Same loud hum here on a basscube 12. I bought this as part of the movieworks 5.1 setup back in 2000. I thought it was the bomb at the time, but the made in china cheap a-s-s parts just reiterate that you get what you pay for. I'm cheap (and handy) and have tried to fix the amp. I replaced ZD3. ZD4, C26, C27 and the 2 6800uF caps. R63 looked ok although I can't tell what the bands are as they are not spaced correctly and have no idea what the tolerance and multipliers are. Thanks to parris134, I'll try replacing it with a 1200 ohm piece. Oh yeah, forgot to mention that after replacing all those items, it still makes the same loud hum as soon as I plug it in. I'm wondering if R63 is the culprit now. I'll give it a whirl and will report back. p.s. I think the "S" in basscube 12S stands for sucky.

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2 Answers

Has humming sound when powers on


You may have a power problem. Check to make sure that your wires aren't touching and not crossed.If this doesn't help try plugging in you sub to different plug could be getting interference electrically in the spot it's in

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this may be result of blown capacitor - have it analyzed by applying strong magnet over the inside speaker , if humming persists, then its not blown capacitor -- the capacitor stores energy, and if that energy is lossed an out in the airwaves, thats the humming effect

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Bass Cube 12 makes loud buzzing noise when turned on !


Hi Ok thanks. I cannot be 100 % sure about this without seeing it but it sounds alot like there is a power supply issue, either bridge rec or caps. Caps are very often very obvious. If you get into it and have a look at what is normally the 2 or 4 biggest capacitors at the start/power supply of the board and see if they are ok visibily. If they are bulged, (often they actually explode and leave paper residue) then those are what need to be replaced. Have a look and see.

If its the bridge rec, it could be 4 diodes, fairly large next to each other or a square component with 4 legs out. Need a meter to test, but i would start at caps first
All the best

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7 Answers

Cambridge Soundworks Basscube 12S only makes pulsing buzz noise


Hey! So i fixed my problem! This is for the BassCube 10
Like i said before i saw that the circut board was burnt near the diodes ZD3 & ZD4, and the resistor R63. Thanks to Deadly1 and BillRad62, i figured it out. The R63 is a 1200 resistor, and the diodes are 15v zeners. I went with 3x 5.1v zeners to replace ZD3, unfortunately Rip-Off-Shack (Radioshack) didnt have 3 packs of these so for the ZD4 i put a 12v and 5.1v. Which exceeds 15, but seems to work without a problem. Hope it helps!

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Hi Paulus
A lot brand of speakers, like Sound Blasters, Logitech, Cambridge, has this (strange) kind of volume problem, sometimes, is the resistor, in the volume control, sometimes in the modulator for the board on the sound speakers, Subwofer.
I use a general tip is let the volume in one setting and don't move in the intermediate low volume say....9 .
from other thing, be change the speakers.

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Sounds like a ground loop issue. Try plugging your sub, and the rest of your entertainment equipment into the same outlet with an extension strip (4 plug adaptor). If there is too much stuff to plug into one strip, experiment with combinations and hopefully you will find which piece of gear is the culprit.

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3 Answers

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Some componet in the Amp circuit is breaking down. The longer you let this go, the more of a chance that you will have a major short and blow out several parts,m as thats what happens with amps. Get it service asap and dont use it.

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