JBL sub

[scorpionkingct]

how many people dont use a subwoofer? and if not what sub are u buying?
does it matter per wattage per ur receiver, example i have 630 watt receiver, should i get 600+ sub?

I was leaning towards ...JBL 12" Studio L8400P 600-Watt Powered Subwoofer. BB wants 800 but i can get it for 550 bucks. I am not usinga sub and it sounds good, what about every1 else. is their a big difference when i hook a sub up?

I dont know too much about subs how does this sound:
Product Features

* 12" powered subwoofer adds bass impact and excitement to your home audio
* Built-in amplifier supplies 1200 watts peak power; 600 watts RMS
* PolyPlas driver delivers cleaner, more realistic low frequencies

* From our expanded online assortment; not available in all Best Buy stores
* Rubber-surround, cast-aluminum chassis, HeatScape motor structure, Symmetrical Field Geometry, oversized fiberglass voice coil and magnetic shorting ring
* Low-pass crossover frequency continuously adjustable from 50Hz - 150Hz
* Low-diffraction IsoPower baffle
* Gold-plated, 5-way binding posts; bi-wire capability allows improved connectivity and use of either 1 or 2 speaker level inputs
* Frequency Response: 50Hz - 150kHz
* Impedance: 8 ohms


Running
Receiver- Sony 630W 6.1-Ch. A/V Home Theater Receiver (Model: STR-DG710)