More power and flexibility for your subwoofer section. ES double voice coil models permit to make connections in series and in parallel and to increase the number of speakers in order to choose the type of connection and to use all the power your amplifier can supply. Double voice coil, i.e.: double power, double efficiency, smaller boxes. Typology, overall dimensions, versatility, the best solution to every need; your bass will be always up to your expectations.