I'm running the Morgan AC40 1x12 combo with a WGS Blackhawk HP (100w) who's sensitivity is rated at 99.26dB. I'm playing around with replacing one of the 12AX7's with a NOS 5751 to get less breakup and more clean headroom at stage volume. If that doesn't work (and before going investing in an Unleash), would a higher efficiency speaker make that much difference? something like an Eminence Tonkerlite 16, at 101dB? I've also read that Eminence's sensitivity ratings may be a little exaggerated…I'd be sticking to the theory of using a speaker that can handle double the amp wattage, so something 75w+. If the minor point differences are noticeable; any higher sensitivity speakers you'd recommend with the Alnico (Vox) vibe?