I am using a Butler hybrid with my RM25xl's, so it should work with your 25si setup. I thought the Bel Canto 1000 amps were real good, but drum's were TOO good for everyday use for me.
I used the Speltz cables with the Joseph's with an old Carver amp and they were Ok, but when I used the Bel Canto amp in the same setup, the Speltz were terrible. FYI. Never tried the Speltz with the Butler.
I used the Speltz cables with the Joseph's with an old Carver amp and they were Ok, but when I used the Bel Canto amp in the same setup, the Speltz were terrible. FYI. Never tried the Speltz with the Butler.