Sounds like the car has a subwoofer
The Focals are pretty amazing for their size. The woofer is capable of as low as 36hz without distortion.
It sounds as if there is a good 10" sub in the car.
The Bose subs were good for super solid midbass but not low enough(typical Bose). The Focals sounds like a true subwoofer.
At the retail price of $474.99 EACH they better sound good.
__________________
http://i46.tinypic.com/2qx0rqs.jpg
2001 Boxster Artic Silver / Black Interior
-GT3 Front Bumper w/ Lip
-Side Skirts
-Gemballa Exhuast and Cats
-O.Z. Racing 18" Wheels
--18X8.5Front 18X10 Rears
-Michilen PS Tires 225/40/18 & 285/30/18
-5mm Rear Spacers
-Porsche Door Sills
-H&R Springs
-Powerflow Intake
-B&M Short Shifter
-Pioneer Avic-F90BT Navigation
-Focal Polyglass 165VR3
-Alpine PDX 5 Amp
-Bose OEM Subwoofer & Midrange
-Audio Controld DQXS (DSP)