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Alcone bass drivers for subwoofers

Ralph Mantel (RCM) is going to launch new High-End products:
Bass drivers for subwoofers, designed and manufactured for best possible sound projection. The drivers' cones are now seamless, ensuring that they are not starting to wobble. Cones with seam tend to flutter, since the seam lags behind. AC12 SW
 
 
Picture 1:
AC 12 SW8
The new range's goal was not to break any records in low bass and cone excursion like BassExciter or Peerless XLS 10. The new bass drivers rather impress with clean and accurate sound. AC12 SW8
 
 
Picture 2:
AC 12 SW8
(to the left)
Design and construction are pleasing, too: high quality die cast with a ventilated magnet system and a shape just right for good airflow. Ralph Mantel (RCM) asked Joe D'Appolito to calculate the optimum tuning.

AC8 SW-8   - not available

222 mm subwoofer with strong magnet and very rigid and heavy aluminium cone. Extremely high power handling, inverse dome dust protection, rubber surround, die cast basket, gold plated terminals, pole piece hole, rear ventilated spider, lowered aluminium sandwich cone.
  AC8SW
Technical Data:
  • Resonance frequency: 37 Hz
  • Power handling (continuous/programme/peak): 120/240/800 Watt
  • SPL at rated input: 89,4 dB (2,83V; 1m)
  • Impedance: 8 Ohm
  • DC resistance Re: 6,6 Ohm
  • Coil inductance (1kHz): 2,56 mH
  • Qts=0,24 (Qes=0,25; Qms=8,34)
  • Vas=23,67 litres

    • Install recommendation for subwoofers from 32 Hz:
    35 litre bass reflex cabinet with 2 drivers and 70 mm bass reflex tube of 185 mm length.

    AC8 SW-8 CL - by request also as special version for closed subwoofer cabinets
    For closed cabinets of 22 litres the AC8 SW8 CL should be used.
    technical data: Qts=0,57 (Qes=0,59 Qms=19), Vas=27 litre, Fs=49 Hz
    Price:

    AC8 SW-4, 4 Ohm version - not available

    AC8SW
    Technical Data:
  • Resonance frequency: 37 Hz
  • Power handling (continuous/programme/peak): 120/240/800 Watt
  • SPL at rated input: 91,8 dB (2,83V; 1m)
  • Impedance: 4 Ohm
  • DC resistance Re: 3,3 Ohm
  • Coil inductance (1kHz): 1,27 mH
  • Qts=0,26 (Qes=0,27; Qms=7,95)
  • Vas=22,6 litres

    • Install recommendation for subwoofers from 32 Hz:
    35 litre bass reflex cabinet with 2 drivers and 70 mm bass reflex tube of 185 mm length.

    AC10 SW-8   EUR 169,00

    274 mm subwoofer with strong magnet and very rigid and heavy aluminium cone. Extremely high power handling, inverse dome dust protection, rubber surround, die cast basket, gold plated terminals, pole piece hole, rear ventilated spider, lowered aluminium sandwich cone.
      AC10SW
    Technical Data:
  • Resonance frequency: 31 Hz
  • Power handling (continuous/programme/peak): 170/340/1100 Watt
  • SPL at rated input: 89,3 dB (2,83V; 1m)
  • Impedance: 8 Ohm
  • DC resistance Re: 6,45 Ohm
  • Coil inductance (1kHz): 2,45 mH
  • Qts=0,35 (Qes=0,37; Qms=6,7)
  • Vas=53 litres

    • Install recommendation for subwoofers from 28 Hz:
    40 litre bass reflex cabinet with 70 mm bass reflex tube of 208 mm length.

    AC10 SW-4, 4 Ohm version   EUR 169,00

    AC10SW
    Technical Data:
  • Resonance frequency: 28 Hz
  • Power handling (continuous/programme/peak): 170/340/1100 Watt
  • SPL at rated input: 92,33 dB (2,83V; 1m)
  • Impedance: 4 Ohm
  • DC resistance Re: 3,18 Ohm
  • Coil inductance (1kHz): 1,89 mH
  • Qts=0,23 (Qes=0,24; Qms=6,52)
  • Vas=48 litres

    • Install recommendation for subwoofers from 28 Hz:
    22 litre bass reflex cabinet with 70 mm bass reflex tube of 430 mm length or with passive driver. In this case the bass at 30 Hz should be boosted by 3 dB .

    AC12 SW-8   - not available

    330 mm subwoofer with strong magnet and very rigid and heavy aluminium cone. Extremely high power handling, inverse dome dust protection, rubber surround, die cast basket, gold plated terminals, pole piece hole, rear ventilated spider, lowered aluminium sandwich cone.
      AC12SW
    Technical Data:
  • Resonance frequency: 25 Hz
  • Power handling (continuous/programme/peak): 250/500/1600 Watt
  • SPL at rated input: 90,4 dB (2,83V; 1m)
  • Impedance: 8 Ohm
  • DC resistance Re: 6,43 Ohm
  • Coil inductance (1kHz): 3,84 mH
  • Qts=0,22 (Qes=0,23; Qms=8,49)
  • Vas=84 litres

    • Install recommendation for subwoofers from 27 Hz:
    50 litre bass reflex cabinet with 100 mm bass reflex tube of 400 mm length.

    AC12 SW-4, 4 Ohm version   - not available

    AC12SW
    Technical Data:
  • Resonance frequency: 25 Hz
  • Power handling (continuous/programme/peak): 250/500/1600 Watt
  • SPL at rated input: 93,2 dB (2,83V; 1m)
  • Impedance: 4 Ohm
  • DC resistance Re: 3,16 Ohm
  • Coil inductance (1kHz): 2,14 mH
  • Qts=0,21 (Qes=0,22; Qms=7,87)
  • Vas=75 litres

    • Install recommendation for subwoofers from 27 Hz:
    50 litre bass reflex cabinet with 100 mm bass reflex tube of 400 mm length.

    >>> The Alcone drivers
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