I got a Crate Powerblock running through a 4X12 marshall 1960a cab in stereo. The impedance is set to 4 + 4 ohms coming out of the Powerblock into 8 + 8 ohms on the cabinet.
Everything worked out fine, until I bought two new speaker cables (a little longer than the ones i used to have, cause i needed the extra lenght). Now the sound sort of stutters, or gets chopped up.. What could be causing this problem? Do I need to go to the shop and return the cables? Or is it an amp setting or something?