Originally Posted by ALEX.

anywhere that's not Strathfield or JB Hi-Fi...

Westside Car Audio take a lot of pride in everything they do. They take the smallest job seriously.
Also, I can't fault Albert's Car Stereo so far. The Cannington store is well regarded amongst that chain for install quality, but you do live in Ellenbrook so a bit of a trek.

I have a high-quality amp for sale if you are interested which will power your new speakers
PM me if interested, it's unused.
/plug