Id rather build my own speaker box. If you build your own you can built two large ones and 2 smaller ones for veg/clone and they will all look the same.
Build your own with a 150 hps each build them atleast 4' tall, build a separate box on top for the light where you can vent it. Use some vertical T5's on the corners for veg. Don't worry about raising the hps in a small cabinet the light will reflect off the sides..
I've seen a few speaker grows
and they are always
COOL
as it fits, being a guy in his 20's(?) with the biggest meanest stereo on the street
so having a continual supply of weed is a 'no brainer'
wide enough to take 1x 5 gallon pot and about 4 feet high is good
passive air inlet at the floor
with a pc fan extract at the top rear, tho I found small to mid sized led lights to work best
hang on chains to adjust daily
it is worth your time putting a large access door on the back of each speaker
as the only time that you will need to conceal the plants ..is when you ain't about or have visitors