Features and Specifications:
- Frequency response 40hz to 200hz
- 97dbs 1w @ 1m Sensitivity.
- 500w RMS power handling.
- 8Ω Nominal Impedance.
- 36hz Resonance frequency.
- Re 6.46Ω
- Qts 0.60, can drop to as low as 0.5 after break-in
- Qes 0.79
- Qms 2.64
- Le 0.451mh @ 10k Hz.
- 4" copper voice coil with Kapton former

Sorry I forgot Vas, but these are for open baffles anyway, so it is a moot point. These are measured specifications from a few drivers and can vary as much as 10% in any area. Usually, if one measurement is a little different others will be as well.

Also, I am consistently getting Fs in the mid-20hz range with "slot-loading", with a slight increase in sensitivity. The typical response with slot loading in an open baffle is -3 dbs around 30hz or lower.

"Terry's Compact Baffle" plans uses this woofer in its design. This baffle has a size of 34" tall and 21" wide, with an in-room frequency response of less than 30hz to over 18k Hz, REAL WORLD. This design also incorporates slot loading for both the 15" and the 18" drivers which act as acoustical low-pass filters allowing for smaller chokes in the crossover.