10hz? The Peachtree D5 is rated 50Hz-20KHz, though the specs do not state whether that is +-3db or 10db.
If you are getting response in the 10Hz range, it is not originating from the speakers.
From Peachtree's site:
Woofer: 5" long excursion
Tweeter: 1" soft dome
Power Requirement: 40-150 watts
Frequency Response: 50Hz-20kHz
Impedance: 6 Ohms
Video Shielded: Yes
Dimensions: 11 x 7.1 x 10.4 (HxWxD in inches)
Weight: 15.8 lbs