Here are some specs of the F series:
F 5508 3way - 4 Speaker systemDriver Complement:Tweeter: 1 - 28mm Silk Dome
Midrange: 2 - 5-1/4" Special Paper Woofer
Woofer: 1 - 8" Special Paper
Frequency Response: 42Hz-20KHz
Sensitivity: 90dB
Recommended Power: 20 - 200W
Impedance: 4ohm
Bass Reflex Design, Bi-wire
Dimension: 7-7/8" W x 12-1/2" D x 40-3/4" H excluding Spike
Price PHP 12,500.00F 6600 2-1/2way - 3 Speaker systemDriver Complement:Tweeter: 1 - 28mm Silk Dome
Midrange: 2 - 6-1/2" Special Paper Woofer
Frequency Response: 45Hz-20KHz
Sensitivity: 90dB
Recommended Power: 20 - 180W
Impedance: 4ohm
Bass Reflex Design, Bi-wire
Dimension: 8-1/2" W x 12-1/2" D x 40-3/4" H excluding Spike
Price PHP 10,500.00F 5000C 2-way - 3 Speaker systemDriver Complement:Tweeter: 1 - 28mm Silk Dome
Midrange: 2 - 5-1/4" Special Paper Woofer
Frequency Response: 60Hz-20KHz
Sensitivity: 89dB
Recommended Power: 20 - 120W
Impedance: 4ohm
Bass Reflex Design
Dimension: 21-1/2" W x 10" D x 7-1/2" H
Price PHP 4,000.00F 5000 2way - 2 Speaker systemDriver Complement:Tweeter: 1 - 28mm Silk Dome
Midrange: 1 - 5-1/4" Special Paper Woofer
Frequency Response: 60Hz-20KHz
Sensitivity: 89dB
Recommended Power: 20 - 100W
Impedance: 8ohm
Bass Reflex Design Front Firing
Dimension: 7-5/8" W x 10-1/4" D x 14-3/4" H
Price PHP 5,000.00Hope this help