Speakers recommendations when placement is an issue

The Piega's make some speakers that are specifically designed for placement close to the back wall. They are beautiful sounding and a true value speaker.

What is your budget?

I have a similar problem, 1 speaker in a corner next to AV rack , speakers 1.5 feet from back wall. My Bohlender Graebener 501's have a good soundstage and wide sweet spot, They do need about 200 hours break in, a large amp and a subwoofer. After the break in, bi-amped to a madrigal 7.1 amp, they do sing.

Dunlavy's need wide spacing and the listener to be seated some distance back from them to work best. This is true of ANY speaker with a large space between multiple drivers as they need time / distance to blend together and "focus". I do agree that a sealed box is the way to go.

You might want to check into some of NHT's designs, as they incorporate some of the technology learned while Acoustic Research was studying speaker / room interaction. I have NO idea as to if you'll like them or not, it is strictly a suggestion. Sean
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If you have a chance, it would be worth your time to include
the Vandersteen 1C or 2Ce/signature in your group.

The Vandersteens do better than most under less than ideal
placement situations....and are quite amplifier friendly.

Vandies always seem to get your feet tappin'....

Here's a further thought for you--the Egglestonworks Andras. I bought them, aside from the fact that I loved them, because they are designed to go close to a back wall without any boom (I've had them as close as 10" to the back wall with no ill effects, in a setup where my old B & W's had to be at least 2.5' from the wall, with a tube trap immediately behind them as well), and they project as wide a sound front as you'd ever want (at 9 feet apart to clear my equipment cabinet, with a foot on each side), and using an LP with a solo violin that is particularly hard to keep from stretching out into 2 distinct sound sources, the speakers are still aimed to cross their direct radiation output about 2 feet behind my head (if the room were in fact that wide). Only caveat: you need lots of power. I use Classe CAM-350s (350 watts per side), and they're great, but 250 watts per side is a minimum.