Specifications From Ampeg.com LF Drivers: 4 x 10" Voice Coil: 2" Magnet Weight (each): 30 oz HF Drivers: Horn/Driver Voice Coil: 1" Magnet Weight: 8 oz RMS Power Handling: 500-Watts Frequency     Response (-3dB): 48Hz-18kHz Usable Low     Frequency (-10dB): 28Hz Nominal Impedance: 4-Ohms Sensitivity: 98dB Maximum SPL: 125dB Dimensions (W x H x D inches): 24 x 23.5 x 17.25 Weight: 110 Pounds

When I bought this cabinet, I did a side-by-side comparison of it against the SVT-410HE. I had read that this HLF was the one to get, but for $100 extra, I thought I'd see for myself. The HE sounded fine...then when switched to the HLF, the walls rattled...it pushes a noticable amount more air. Given the weight of the 6 and 8 speaker versions, I am absolutely thrilled with this cab.