subs

I know that everyone is always on the lookout for inexpensive subs . These are thruster 8" subs   @ $ 49.00

10"@ $75.99

12"@ $93.00

 this is after tax

These exclusive THRUSTER® subwoofers incorporate these top 10 upgraded features: • High density magnet assemblies with full heavy duty backplates bumped for maximum voice coil excursion • High temperature Kapton voice coils and adhesives • Premium foam half roll surrounds for increased damping and lower distortion • Strong stamped steel baskets to eliminate vibration and rattle • Bigger basket windows to reduce cone back pressure • Vented magnet structures for increased cooling and greater power handling • Long throw 4 layer voice coils to increase power and X-MAX • Heavy duty spiders to control cone movement and linearity • Treated dust-caps to minimize cone distortion and reflection • Gold 5-way binding posts for better connections using heavy duty voice coil leads for longer life • Not sold through any other distributor or dealer network • All speakers individually boxed with highly attractive packaging and graphics. 8" Diameter, 30 oz. Magnet Wt., 1-1/2" Coil Diam., 125W RMS, 4 ohm Impedance, 91 dB, 35Hz-3kHz.

Maybe I missed it, but what is the recomended Air Space requirments for the 8" You remember 7 or 8 years ago you gave me an ADS A8S sub.  I am still using it to this day, but the sub is starting to get sloppy due to the amount of abuse I have put it through over the years.  Thinking a new 8 might be in order.