Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: can i power 2 6" speakers and a subwoofer? If so... What's a good subwoofer to go with? I think my 2 fosgate 6" rear speakers are 80 watts each.
Document: I have 6 of these pa series amplifiers hooked up in a classic van. I am running no less than 4 ohms per channel. For the most part I've had nothing but good luck with these amps. I am using Cadence Flash series 6x9 , and 6.5 component speakers as well as Lanzar Pro Subs and lanzar Pro 6.5's. I think these amps are a great bang for the buck when properly Installed. If buying used. Make sure you test it right away......
I thought, "wow! Thats awesome!" and bought a big amp that could put out 300 watts to each speaker. I instantly fried my speakers!lol. Later on I learned those speakers only put out about 50-60 watts RMS. Lesson...match amp and speaker RMS as close as possible, and set gains correctly. You live, you learn.lol. Hopefully this info will help someone not make the same mistakes so many of us have made in the past.
I have a 2012 F150 extended cab. I installed a new head unit, front DXi6500 component speakers, a 10&#34; Pioneer sub and the amp. Sounds great!! Plenty of power to crank it up. Crystal clear sound.
Best 4 channel amp in the market today,good thing i sticked with this one rather than those offered in the market. Now next in my list is the subwoofer...
this gives my speakers the perfect amount of power and makes everyone else's cars sound horrible! love this amp a lot!
Ran it at 3/4 volume for about 30 mins and the amp did not go into protect mode. Going to give it a full test run soon as I get my gains dialed in a bit better. Overall, it seems to be a pretty nice amp so.
Purchased this pa660 used for cheap. All i have to say is dont buy it used, i wish wish wish i had a full warrenty from Polk directly. the amp has a ton of clean power, very good looking. love it, but it has a hiss comming from the rca connectors. it has nothing to do with my car's set up and wiring (i tested and tested), but directly hissing from the amp rca's. that is my 1 and only complaint.
I bought one of these from Best Buy for $129 new. It was on sale and it was an awesome amp. I needed another and the price went back up to over $200, and I found this good condition used one here for about $100. It came complete and works perfectly. I definitely recommend this product and this seller.
Just hooked up my PA660 and its quite nice!Ive got absolutely no unwanted noise as with my old RCA amp.This amp has plenty of power for the casual car audio user.Have it runnin 75W X 4 @4ohms to a set of Polk DXI 650s up front and a set of Morel 6x9s in the rear...and amp pushes them nicely...such a crystal clear sound compared to my last RCA amp.The piano black finish is super nice!
Great price.... great amp..... just hope it can keep up with the monster's in the back!!! Clean power .............
Answer: Yes you can.  You would wire the two 6" to the front channels and the sub would be wired to the two rear channels but in a bridged fashion.  The polk manual should show you how the wires should be run the be bridged properly with that particular amp.  As far as sub goes I have a polk DXI 12 in one of the polk ported boxes they come with powered the same way and it sounds great.  It won't shake the neighbor hood but provides very good low fill.