I am not sure it goes below 100 HZ either. I have not found any specs on the ADS anywhere. It does have a 4" woofer perhaps like the one in the less expensive Minimus 7 rival at the time. The Minimus 7 specs go down to 50 HZ. http://support.radioshack.com/support_audio/doc31/31593.htm
Looking strongly at the Martin Logan Dynamo 300 sub. It can be had for $130.
Looking strongly at the Martin Logan Dynamo 300 sub. It can be had for $130.