The infinity kappa 1000w operates best at 450 watts rms( 2 ohms), sub channel operates at 500 watts (1 ohm),would the sub channel hurt the speakers ?

only if you distort them. If you are after SPL, there are a lot better amplifier choices for subs out there. 5 channel amps are mainly for small systems where a person wants more than stock but not an outrageous system. distortion is the biggest destroyer of voice coils, not power. You are more likely to drive this amp into clipping if high SPL is what you are after. it will run a couple twelves well, but nothing super- maybe in the 130's or so. also if you are running a 2 ohm driver, the 1 ohm output is irrelevant. If you are running two 2ohm drivers then that would be 250 to each driver which is 200 less than your sub can take. get a bigger amp if you want more bass. hope this helps, not sure how many subs you are running.

Is it possible to have the speakers running at 4 ohms and the sub running at 2 ohms? If so, what are the power ratings then?

It is a 5 channel amp. You can run the sub down to 1ohm @ 500watts rms. @2ohm it would be about 400. running the other channels @4ohms would give you about 70watts per channel. Here is the owners manual. http://www.manualowl.com/m/Polk%20Audio/PA-D5000.5/Manual/378143?page=4

Hello i wanna know if works fine with 1 set mm651 coaxial + 1 set mm6501 component + sub polk audio 10inch model 1042dvc.

Should work fine,my set up is component speakers in front,3 way 6x9's in back and a 10 " sub in trunk. Sounds really good at half volume !

Does the amp come with a bass knob that you can mount anywhere? What does it look like?

Yes, it does. Amazon does not allow me to upload an image, but type “car amp bass controller” on google and you’ll get a good idea of what mine looks like.mine is a small single knob.

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Manufacturer	POLK
Brand	Polk Audio
Model	PAD50005
Item Weight	4.4 pounds
Product Dimensions	6.69 x 5.91 x 3.15 inches
Item model number	PAD50005
Batteries	1 12V batteries required.
Is Discontinued By Manufacturer	No
Manufacturer Part Number	PAD50005
Wattage	500 watts

Polk PAD50005 5-Channel Digital Power Amplifier

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