The 25th Aniversary Clash remaster of "London Calling" has better bass extension.
I'll have to get that - thanks for the heads up - I always felt London Calling was a tad bass anemic.
BTW - there was nothing anemic about my 45 RPM 12" "Rock the Casbah" - I bought this as soon as it was released in 1982. I was just in total awe of that sound. I totally wore out the groove on that one. I remember my GF and dorm room mates would role their eyes as this blasted out onto the street and hallways for weeks on end.