I have a pair of Janis W-1 subwoofers made in the Bronx by John Marovskis in the 70s. Each has an Interphase 1A combination amp, crossover and phase control. Searching to see if anyone in Audio Circle can recommend someone to service them as they seem to have stopped functioning. (Not totally unexpected for equipment of this vintage.) Perhaps as an alternative you can recommend replacement electronics of a more recent vintage. Thanks.