you can find them at his website:
http://cosciaguitars.com
Its a nice little grab and go with a JBL but any 12" speaker with a big enough gasket will fit in there (eminence speakers fit). I think bringing the headphone out to the front was a nice touch and also you can daisy chain right out of the cab and easily run a pair of 8ohm speakers
E120 pictured not included


