hi everyone. ive been reading good things about ceriatone so im going to order a jtm 45. i need help with the ordering though since im not that knowledgeable about amps . id like to order his standard jtm45 but id like some reccommendations on custom options. impedance selector is a must i assume? also ive been reading that the bass in these is flubby. now can i have nik cure this while he's building it? if so how? any reccommendations you have will be greatly appreciated.