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REL Q150 Roll-Off Setting

Discussion in 'Home Cinema Speakers' started by Ultima, Aug 23, 2005.

  1. Ultima

    Ultima
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    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.
     
  2. Ultima

    Ultima
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    MODS If I have posted in wrong forum and it should have been in subwoofer forum can you please move.

    Regards
     
  3. Ian J

    Ian J
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    Trial and error is the answer and it is best to set the crossover on the sub as low as possible without compromising on the output.

    Speaker manufacturers can be very unreliable with their stats and whilst the speakers may go down to 65hz the output could be well down so I would start at about 80hz and try it out gradually reducing the crossover until your ears tell you what the correct setting is.
     
  4. Ultima

    Ultima
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    Thanks Ian, will give it a go.
     

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