Original Black Sabbath Laney Supergroups PLEXI KILLERS

I'm playing and comparing two 1969 Laney Pre Supergroup 60 amps. One is the PA version and one is the Standard version. I'm playing the through a 1972 Dan Armstrong 4x12 with two Celestion T1976 G12H30 75Hz and two Celestion T1221 G12M25 75Hz speakers. The T1976 is the classic Tony Iommi speaker that he used with Black Sabbath in the 1970s along with Supergroup amps. I'm using a 1969 Gibson SG Special with P90s.