Need to replace the woofer, and get a sub woofer

Try another speaker - if it does the same thing your amp is damaged.
If replacement speaker sounds fine then your original speaker is defective.

the distorted sound coming out of your sub-w is actually originating from your audio unit, Have your audio unit check for possible repair

If it is clean power it can handle it. Bad power causes distortion and DC output. That is what kills the sub woofer. The going rate for quality / good wattage is a dollar per watt. If you are not spending that much, then it is bad power.

Simply put, burned voice coil. Either too much power can do this or not enough power with distortion. solution- if the sound is clear then its too much power- turn the amp down. If the sound is distorted and raspy- its not enough power and your getting distortion-get bigger amp.

FIRST OF ALL --- THERE IS A FEW THINGS YOU NEED TO KNOW BEFORE HOOKING UP
A WOOFER LIKE THIS ---- IS THIS A STORE BOUGHT POWERED SUB WOOFER ? DOES IT HAVE IT'S OWN CROSSOVER BUILT INSIDE ?? I WOULD GUESS IT NEEDS TO BE HOOKED
UP TO A SUB WOOFER OUTPUT FOUND ON THE BACK OF THE IN DASH PLAYER ..
THE WOOFER NEEDS TO RECEIVE ONLY LOW FREQUENCY AUDIO WHICH MOST OF THE NEWER CAR STEREOS PROVIDE BY AN RCA JACK ON A SHORT WIRE COMING OUT OF THE STEREO ...
IF YOU TRY AND TAP IT TO FULL RANGE SPEAKERS THAT ALREADY ARE CONNECTED TO AN AMPLIFIED SIGNAL THE SOUND WILL BE DISTORTED .......
POWERED SUB WOOFERS NEED A LINE LEVEL INPUT WHICH IS MUCH LOWER THAN SAY
SPEAKERS ALREADY RECEIVING AN AMPLIFIED SIGNAL.
POWERED WOOFER WILL ALSO NEED TO HAVE A 12 VOLT ELECTRICAL CONNECTION AND A GROUND WIRE TO OPERATE THE AMPLIFIER BUILT INSIDE.
IF YOU HAVE NO EXPERIENCE WITH THIS TYPE OF HOOK UP I WOULD STRONGLY RECOMMEND SOMEONE WHO DOES [ CAR AUDIO SHOP ]

Is it so even at lower volumes?

Are you sure it's the sub distorting and not the front or center speakers?

If you designate them incorrectly as Large (which tells the receiver they CAN effectively produce bass frequencies) they will probably distort in the presence of low frequencies.

See Page 17, 19

Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Sony-HT-6600DP-Home-Theater-Systems-manual/id/390ag319/t/2/

I think you've just answered your own question. It sounds as if you've coned the sub woofer. Meaning you've fractured the bond between the edge of the speaker body with the speaker cone. Or overheated the voice coil and it's distorted and not getting free movement. Excuse the Pun but it "sounds" like you need a new speaker as a replacement. If it's a particularly expensive speaker it can be reconed. A check of the Net for someone close to you will find a company who recones them. If it's a cheaper one then a replacement would be in order.

Your sub woofer is not mean for voice sound...check that you have connected the systen up properly and that you have put the sub woofer into its wn connection..if it is in the right connection the woofer could be blown.also try decrease the midrange hurts on the woofer

Hello css42103,

You did not specify the impedance or the model of your Audiopipe replacement woofer but if it is the TS-V6 DVC 6.5", then the impedance of each voice coil is 4ohms. If you wired the coils in parallel, you now have a 2ohm load to the amp. At 2 ohms, the amp tries to produce more power, and even at moderate volume, can be driven into clipping causing distortion. Not good for the amp. Definitely not good for the woofer.

I'd try wiring the woofer coils in series and see if it stops cutting out.

Hope this helps.

There are several causes of distortion in an audio setup.

1) Speaker is unable to handle the frequency that it's being fed
2) The volume is too high for the speaker to handle
3) The amp can't provide enough power to drive the speaker adequately.

Either way distortion is BAD & best to be avoided unless you want an excuse to buy a new set of speakers :P