i want to build a 1x18 cab as an addition to my 4x12 with model-t. i mainly thought about it for the lows, cause we play very low. is it a good idea to mix these cabs? have heard josh homme played through 18"s cabs in kyuss days. i want to buy a new speaker with about 200-300 watts, my 4x12 has about 260 watts. what would be an good, affordable speaker? greets, thomas