Certikin Isolating transformer (must be used with every speaker) SL600TC
These 20W underwater speakers have been designed to fit inside a Certikin light niche (in place of light guts) and have a rated power impedence of 8 ohms. An isolating transformer should be used with each speaker. The speakers should be driven by an amplifier of a suitable size please consult a hi-fi specialist to ensure correct sizing.