I have a pair of B&W LM1 fronts that have the following specifications. Technical Specifications : LM1 Description 2-way vented-box system Dimensions Height: 280mm (11 in) Width: 140mm (5.5in) Depth: 191mm (7.5in) Net Weight 2.4kg (5.3 lb) Freq. Response 75Hz - 20kHz ± 3dB on reference axis Freq. Range -6dB at 65Hz and 22kHz Sensitivity 91dB spl (2.83V, 1m) Normal Impedance 8ohms Power Handling 25W-100W continuous into 8ohms on unclipped programme Drive Units Unit 1: 1x 1x 125mm (5in) bass/mid Unit 2: 1x 25mm (1in) high-frequency Unit 3: Dispersion Description: Within 2dB of response on reference axis Horizontal: over 40 deg. arc Vertical: over 10 deg. arc Harmonic Distortion 2nd & 3rd harmonics <1% 100Hz - 15kHz (90dB spl, 1m) Crossover Frequency 3kHz Max. Recommended Cable Impedance 0.2ohms Bowers & Wilkins 2002 What Roll-Off setting on my REL Q150 sub would anybody recommend? If reading the specs right, 65Hz is the lowest these speakers can go so should I set roll-off to say 70Hz? The REL is connected to a NAD C350 amp if this makes a difference. Any suggestions or corrections truly appreciated.