Small Blocks are modeled after CELESTION greenbacks, but handle 55 watts. Big Blocks are modeled after CELESTION Heritage 30's, but handle 60 watts. Scott most likely worked with Eminence to match the speakers to his amps. My Splawn 2x12 with Small Blocks and my Quick Rods are some of the best tones I've ever heard, and my band agrees. Now I have a Splawn 4x12 with Small Blocks and it is the perfect balance of vintage and modern tone. The Big Blocks work a little better with the Splawn Nitro.