Depends on perspective...line array speakers are often very thin & tall, while planars just the opposite.
Bel Canto was a good suggestion for small cabinet electronics. Really most of the class D amps these days are small (e.g. Rowland, Rogue, etc.) If you configure something like a Vinny Rossi LIO, you can get amp/pre/dac all in one box, feed it from a NAS in another room and some skinny speakers and there wouldn't be much to look at...Cheers,
Spencer