The problem is getting the tweeter height right, It needs to be at 42 inches (from memory). A straight WMTMW configuration would put it too low, unless you have a blank spot below the bottom woofer.
I did some plans for a 4 way that kept the tweeter at the right height a while back, with and without a sub tower.
The drivers were going to be the Millenium, Seas W22, Focal 10L6411 and Stryke AV15.
Regarding the crossover, I don't think you just use the Orion one stock as doubling the mids would increase efficiency by 6dB and you'd need to turn them down.
If you did go to a 4 way, the standard 1440, 120 plus sub setting mightn't be ideal either.
Cheers
Steve
I did some plans for a 4 way that kept the tweeter at the right height a while back, with and without a sub tower.
The drivers were going to be the Millenium, Seas W22, Focal 10L6411 and Stryke AV15.
Regarding the crossover, I don't think you just use the Orion one stock as doubling the mids would increase efficiency by 6dB and you'd need to turn them down.
If you did go to a 4 way, the standard 1440, 120 plus sub setting mightn't be ideal either.
Cheers
Steve