Considering how little I think of the MK Sound S-150 speakers for home theater purposes, I wouldn't even waste my time if I were you. There's a reason they won't sell unless you come in in person. And there's a reason the guy on Craig's list is getting rid of them!
Back when they were M&K, the S-150 were studio mixing speakers. And they followed the old, misguided THX theories back then, which called for strict vertical dispersion limits, and completely ignored anything to do with soundstage or imaging. The whole point was to deliver highly localized sound so that mixers could easily steer sound effects into each of the individual channels. But for playback, they suck! The sound is, "here's a speaker! And, here's a speaker! And look over here, another separate speaker!" There's no sense of soundstage, no imaging, no sense of realism. They're a decent enough tool for being able to easily pick out when you steer a given sound into a particular speaker channel during mixing. But there's a very good reason why "THX speakers" got an early reputation for being horrible for music playback, and it's largely because of the S-150 speakers.
Save your time, save your money, and buy yourself some speakers that are actually good for playback! Unless, of course, the whole purpose of your purchase here is to experience what movie soundtrack mixers were using 15 years ago and have since abandoned since it sucked. If that's your goal, then ok. But if you're after good speakers for a home theater, look elsewhere!
