I have a Gallien - Krueger 115B 8ohm cab. I dunnot know how many watts the cab is because it is nowhere on the cab, all I have is a model number: C3458 The speaker is an Electro-Voice and here is what it says on the back of the speaker: Electro - Voice Inc. EVM model 15B OEM Type 815-9464 716 I mostly play standard and drop D on a 4 banger but also play a 6'er with the B tuned up to C. I'm looking for a speaker that will handle better then the current speaker befor it was blown (all mids no lows). The cab is old, I've had it for 3 years and I don't know how long the previouse owner had it before he gave it to me(a friend of the family). I have Dimensions for the cab and a pic that I drew of the Dimensions that I will attach, as well all the dimentions are measurements of the inside of the cab. Dimensions: 12" deep, 21 1/4" wide, and 21 1/2" tall V= 5482.5 cubic inches or 456.875 cubic feet. The ports are shelf type and there are three across the bottom. They are 3 3/4" deep. 6" wide and 3 1/4" tall. I hope someone can help me find a good/ efficient speaker to go in here. I will be using it with a Music Man HD-212.