Radical thought- Use 2 pair of speakers

The old, OLD, "Sweet 16" speaker project from Popular Electronics used 16 cheap 5" speakers on each side (but just one box per side), the theory being that crummy speakers driven very little together might produce good sound. My personal opinion is that Bose stole this idea and made a mint. I agree with the posts that say try different speakers, not two pair of the same. Let them 'average out' the sound. Plus the greater power capacity you get with more speakers. Don't spend big bucks, experiment first. I think what will suffer, from what I've heard using multiple speakers, is imaging. Good luck!

Tarsando...Professor Bose had a 24-driver (mono) system in the MIT music library in 1961. I don't know when the "sweet 16" project was published.

The Megaline speakers which Albertporter praises are described as a "line array". (Line arrays can sound great). However, the Megalines actually consist of three enclosures which are stacked.

Hmmm. sounds like this could be fun to try. I will have to wait until my larger towers are repaired...waiting for tweeters. I will let you know what happens but the plan is to place them in the same plane.

This might be what you are looking for. Sound interesting, anyways.

A while ago, just for the fun of it, I did a "stacked" Eminent Technology LFT-8A speaker system. Had eight channels totalling 2,400 watts into 4 ohms pumping into them biwired. I tell you, it was one of the most wickely huge sounds I've ever heard from a system. There are many times I wish I still had it set up because it made me FEEL I was at a concert. It literally made "wall to wall" sound stage. I had two Vandersteen subs going as well. A system built for pure fun and I sure did have it! Enjoy playing around with it! This hobby is supposed to be fun!
Just throwing different brand speakers together may result in something similar to what the college cafeteria does with leftovers... could get messy.