A friend is building a home theater system in his condo and I advised him to look at the Polk line of speakers. He decided to get two pairs of the AB755 In-wall speakers for his fronts and rears, so I helped him temporarily set them up for evaluation before installing them inside the walls. He also bought a CS245i center speaker and a PWS350 sub to go with them, and is powering them all with a Yamaha HTR-5460 A/V Receiver.
What great speakers the AB755 inwalls are! I had never heard Polk's In-walls before, but every audio signal we threw at them (pop, classical, DVD soundtracks) sounded good, clean and accurate. Well, almost everything: a Beethoven piano sonata CD caused some break-up in a single AB755 speakers, so I recommended he take that one back and exchange it at the store (which he did, although he also had to return a good speaker too because they came in pairs). But, despite that one problem, these are some great speakers that are virtually a steal at the $250/pair price Circuit City is selling them for.
BTW, because the AB755 speakers look like a regular speaker with the case stripped off, which regular Polk speaker do they roughly equate to in regarded to drivers and crossover?