I have a pair of L300 3 ways (077, LE85, and 2231H) and I am thinking about convert it to a 4 ways (4343) by replacing the crossover and add a pair of midrange. I could not find a pair of 4343 crossover but found a pair of 4345 crossover instead. I am thinking about building a pair of 10" midrange speaker boxes and these will be placing on top of the L300.

Here are the following components:

Tweenter: JBL 077 (from L300)
Compression Driver: LE85 with 91 len (from L300)
Midrange: (Dont have yet and need sugestion. K110? 2122?)
Woofer: JBL 2231H (from L300)
Crossover: JBL 4345 crossover
Cabinet: JBL L300


Do you think the above components sound good when put together or what am I need to be change?

Thanks in advance,
Taylor