Question about Wharfedale PowerCube PC-10 Subwoofer

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My subwoofer makes a very loud shreaking sound consisting of a mixture of high and low tones (almost sounds like it is about to explode) after power has been on for about 5 minutes. I had the problem before and sent the speaker away for repair. I was told the driver(s) needed to be replaced. The repairs were apparently done but the problem is still there.

Posted by kevdeblennox on

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David Dunn

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Did they charge you much for that 'fix'?

Though it may have become damaged in the original problem, the driver won't make loud sounds by itself in the absence of a signal. The internal amp is probably malfunctioning and it is very capable of destroying its own driver. Don't let it continue when it starts acting up.

Did it work correctly for more than 5 minutes after the driver replacement? Take it back and make them do it right this time.

I had a powered sub amp problem that the local guy couldn't fix so I just disconnected it and wired the driver directly out to a separate amp. Works fine as a passive sub.

Posted on Jun 11, 2010

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How to Stop a Subwoofer Hum - HowStuffWorks

electronics.howstuffworks.com/how-to-stop-subwoofer-hum.htm
Would you like to learn how to stop your subwoofer from making a consistent low-frequent hum or buzz? Read this article to learn how to stop a subwoofer hum.

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My Korg c15s has a lot of grating staticky noises when played ....I'm told it cannot be repaired as Korg no longer makes parts for this model?


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They also try to play the bass


a crossover cuts the certain tones out of the sound.example: the high side cuts out low and mid tones,or the mid side cuts out high and low. The only problems this could be is that the crossover is not set right or not wired right. These speakers should be plugged into the high side of the crossover. If wired right and set right then your crossover is no good.

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Need correct air space with port displacement for high and low tones also for spl


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High x-max vs. high sensitivity


Sensitivity is a representation of efficiency. The higher the efficiency, the better the sound quality.
Xmax is a measure of the "throw of the cone peak to peak. This is a direct representation of the volume of air the subwoofer will displace..
A High X.Max subwoofer will displace more air - and therefore produce more SPL in a vented enclosure.
Sensitivity on these subs aren't crucial, because the customer is looking for LOUD and will purchase a large class D Mono amplifier to power it - characteristically low in sensitivity as well due to the way the power is inverted. Highly efficient, yet low sensitiviy.
I am definately a basshead! My show car has (4) 15" Cerwin Vega Stroker PROs. (one of the most highly EFFICIENT high xmax subs available) (86dB). (36-44mm Xmax (adjustable for SQ or SPL)
ea141e4.jpg If you are looking for SPL, High XMax, Low sensitivity, and lots of power is the way to go. Generally, to increas SPL by 3dB, yuo must either increase surface area of driver 2x or double the input power. Slot ports, aeroports, and loaded horn ports can also increase your dB level by up to 3dB as well.
Properly constructed enclosures have an effect as well. Instead of wasting some of your power on vibrating the enclosure, it should be braced properly to reduce the wasted energy.
All of these tips will add tou your satisfaction of the product. You can make a $100 sub sound phenomenal in a proper enclosure, and a $400 sub sound like $hit in a prefab or poorly constructed one.

Your original question - with all things equal except the subwoofer, the subwoofer with the higher Xmax should yield the most SPL - due only to the fact of air displacement.

If you have additional questions or need clarification dont hesitate to ask.

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