More home audio stuff again. I have a vintage Polk audio passive subwoofer. Model number RM 1000 W . This is a very nice passive subwoofer it consist of 2 6 inch sub woofer's behind a 10 inch passive radiator. This is a sealed box design. Here are some of the specs that I found out it. The RM1000 was the bass module that was part of the RM3000 satellite/woofer system. The satellites were called the RM2000 II and when combined with the RM1000 you had the RM3000 system. The RM1000 was made available as a separate unit for owners who preferred two bass modules, from 1990 until 1995 and had a suggested retail price of $390.00 each. The RM1000 used two 6.5" drivers and a 10" passive radiator, power handling was 125 Watts/channel, with a frequency response of -3dB from 42 Hz to 200 Hz.