Hum: Check for faulty phono connecting cable. Try to separate phono cables from power cords (they can induce hum into the system). If that doesn't work we recommend you turn off your subwoofer when it is not in use. This is most easily accomplished by either connecting its powercord to a switched power outlet on the back of your receiver (if it has them) or by using a Remote Controlled Switched Outlet like Radio Shack part
AC SubTM 125, Digital SubTM 100, Digital SubTM 200, MicroburstTM & PS SubTM 225 Specifications:
AC Sub 125 & Digital Sub 100: (1) 10" heavyweight fibercone woofer with 1 1/2” voice coil & 26 oz magnet
Microburst: (2) 6.5" heavyweight fibercone woofers with 2" voice coils and 30 oz magnets
Digital Sub 200 & PS Sub 225: (1) 12" heavyweight polycone woofer with 1 1/2” voice coil and 20 oz magnet
Low End Frequency Response: AC Sub 125 & Digital Sub 100: - 3 dB @ 33 Hz Microburst: - 3 dB @ 32 Hz
Digital Sub 200 & PS Sub 225: - 3 dB @ 30 Hz
Variable Subwoofer Low Pass Filter: Third Order from 50 - 150 Hz
System: AC Sub 125 - 4th Order Bottom Vented
Digital Sub 100 - Acoustic Suspension
Microburst - Bipole, Acoustic Suspension
Digital Sub 200 & PS Sub 225 - 4th Order Rear Vented
Dimensions: AC Sub 125 & Digital Sub 100: 13" Wide x 14 5/16" High x 14 1/2" Deep Microburst: 10 1/4" Wide x 9 1/16" High x 11 1/8" Deep
Digital Sub 200 & PS Sub 225: 14 1/4" Wide x 15" High x 15 3/4" Deep
Weight: AC Sub 125 & Digital Sub 100 - 22 lbs. / Microburst - 25 lbs. / Digital Sub 200 & PS Sub 225 - 36 lbs.
Amplifier Type: Class A/B amplifier
Power Requirements: AC 120 V, 60 Hz
Operating Temperature Range: 50° to 104° F (10° to 40° C)
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