Arn't most of the Vandersteen's using active base modules? In that case the bass would not be powered by the main amp being used.
Also they seem to have very low efficiency, 87 db or less. Not the best choice for tube amps?
Model Seven Mk II Specifications
Tweeter
1” Patented Perfect Piston™ Tweeter with 3-Layer Carbon Fiber/Balsa/Carbon Fiber Dome, Aerodynamic Neo-Magnet Assembly
Midrange
4.5” Patented Perfect Piston™ Midrange with 3-Layer Carbon Fiber/Balsa/Carbon Fiber Cone, Die-Cast Aerodynamic Basket with Neo-Magnet Assembly and Ferrofluid Voice-Coil Cooling
Mid-woofer
7” Patented Perfect Piston™ Mid-Woofer with 3-Layer Carbon Fiber/Balsa/Carbon Fiber Cone, Die-Cast Aerodynamic Basket with Neo-Magnet Assembly and Ferrofluid Voice-Coil Cooling
Subwoofer
Dual 12" Trussed-Aluminum Cones, Dual-Motor, Push-Pull Driver with Die-Cast Aerodynamic Basket with Precision-Machined Opposing Magnet Assemblies with Copper Faraday Rings
Rear-fiiring Tweeter
.75" Ceramic-Coated Alloy Dome
Subwoofer Amplifier
400-Watt High-Current Power-Factor Corrected Amplifier
Recommended Amplification
40-300 Watts Into 8 Ohms
Frequency Response
22Hz-40kHz +/- 2dB
Sensitivity
83.5 dB, 1 meter/2.83 volt input
Impedance
+3 Ohms Nominal, - 1.5 Ohms
Crossovers
100Hz, 600Hz, 5000Hz, 6dB/Octave
Input Terminals
Barrier strips, 1/2" max width
Dimensions (WHD)
14" x 42.5" x 20"
Weight
170 lbs. Net
Country of Manufacture
Made in the USA