The original Torus Power models in the RM series remain unparalleled for performance, protection, and value, with models from 15 Amp to 100 Amp. A popular model in the RM series is the RM 15, which has been consistently top-rated by leading audiophile magazines. Torus Powers power isolation units (PIUS) combine search suppression with massive toroidal transformers to provide AC power conditioning and protection from voltage surges.