I am building a new and portable rig for my Jazz gigs, consisting of a separate SMS tube preamp, an fx unit and an ISP Stealth poweramp. I already own a Thiele cab with a 12" EVM speaker but I also want an open back , Fender style cab, possibly a 2x12" design. Which speaker can you recommend that delivers a warm, balanced and punchy clean tone, comparable to a 60's Twin Reverb ? I have no idea what to look for regarding specs, graphs etc. and since most players are more concerned with overdrive sounds I'm kinda lost here .... any help is appreciated !