- Speco MA series Commercial ABS plastic back can speakers - 6.5? Polypropylene woofer with rubber surround - 1" Mylar tweeter - 34Hz - 20kHz - 40 Watt RMS/ 80 watt max - 88 dB 1w/1m - 8 Ohms - 70/25 volt selector switch - Transformer settings: 40.0, 30.0, 15.0, 7.5, 5.0, 2.5, 1.0, .50, .25, & 8 Ohms - 11" Diameter x 7.5" depth SPCSP6MA