Looking for new speakers?

Greetings, I'm looking for some speakers that will shine even when placed really close to the rear wall. I'm working with only 4-8 inches of clearance. I have a Bel-Canto digital integrated amplifier 150/300 watts per channel and Polk Lsi9 speakers, but at such close proximity to the rear wall, they tend to sound bloated & boomy. I like jazz, r&b, top 40 kind of stuff. I'm looking to spend less than 5k.

Thanks for your time,

Mark :-)