I used dog bowls for about a year, mine had deadening on the inside and out and then painted with thick black underseal... No noise.
I would go for bigger boxes of some sort though.
The bowls unless you run a hollow MDF front panel do not have enough air space.
like this:
Unless you get BIG bowls!
Edited by Ruckus, 15 August 2014 - 11:28 AM.