POWERBASS ASA3-600.1DPOWERBASS ASA3 600. 1D Class D 1ch Amplifier To give your subwoofers some serious power at an affordable price, we offer the ASA3 range in super efficient Class D power. This line offers amplifiers that can provide up to 1,500 watts to a single woofer (if it can take it). Our ASA3 Class D amplifiers are always 1 ohm stable, and still come complete with all our sought after features like subsonic filters to keep ultra low frequencies from zapping power