Subwoofer Beyma 18P1200Nd
[18P1200Nd-8] Avis/Critiques 
KEY FEATURES :
Real 1200 W AES power handling
Sensitivity: 98 dB @ 2.83V
4" duo technology voice coil
Forced air convection circuit for low power compression
Extended controlled displacement: Xmax ± 9.5 mm.
Massive mechanical displacement capability: 52 mm p-p
GENERAL DESCRIPTION :
This model is the result of an extensive and intense research of every single constituent part of an electro-dynamic loudspeaker, rethinking the basics and taking care of every detail, to withstand the extreme power conditions it has been designed to work in.
All this investigation is reflected in the new and innovative technologies developed by Beyma and applied in this new transducer.
TECHNICAL SPECIFICATIONS :
Nominal diameter 460 mm. 18 in.
Rated impedance 8 ohms
Minimum impedance 6 ohms
Power capacity* 1200 w AES
Program power 2400 w
Sensitivity 98 dB 2.83v @ 1m @ 2p
Frequency range 25 - 2000 Hz
Recom. enclosure vol. 80 / 200 l 2.8 / 7 ft.3
Voice coil diameter 100 mm. 4 in.
Magnetic assembly weight 6 kg. 13.2 lb.
BL factor 26.3 N / A
Moving mass 0.199 kg.
Voice coil length 25 mm
Air gap height 14 mm
X damage (peak to peak) 52 mm
MOUNTING INFORMATION :
Overall diameter 460 mm. 18.11 in.
Bolt circle diameter 438 mm. 17.24 in.
Baffle cutout diameter:
- Front mount 415 mm. 16.34 in.
- Rear mount 400 mm. 15.75 in.
Depth 203 mm. 7.99 in.
Volume displaced by driver 13 l 0.46 ft.3
Net weight 8.5 kg. 18.7 lb.
Shipping weight 10 kg. 22 lb.
THIELE-SMALL PARAMETERS** :
Resonant frequency, fs 37 Hz
D.C. Voice coil resistance, Re 5.3 ohms.
Mechanical Quality Factor, Qms 10.39
Electrical Quality Factor, Qes 0.35
Total Quality Factor, Qts 0.34
Equivalent Air Volume to Cms, Vas 198 l
Mechanical Compliance, Cms 93 mm / N
Mechanical Resistance, Rms 4.5 kg / s
Efficiency, ho (%) 2.7
Effective Surface Area, Sd (m2) 0.1225 m2
Maximum Displacement, Xmax*** 9.5 mm
Displacement Volume, Vd 1164 cm3
Voice Coil Inductance, Le @ 1 kHz 2.3 mH
MATERIALS :
Basket: Cast aluminium
Cone: Paper
Surround: Treated cloth
Voice coil: Copper wire
Magnet: Neodymium
Notes:
*The power capacity is determined according to AES2-1984 (r2003) standard.
Program power is defined as the transducer’s ability to handle normal music program material.
**T-S parameters are measured after an exercise period using a preconditioning power test.
The measurements are carried out with a velocity-current laser transducer and will reflect the long
term parameters (once the loudspeaker has been working for a short period of time).
***The Xmax is calculated as (Lvc - Hag)/2 + Hag/3.5, where Lvc is the voice coil length and Hag is
the air gap height.
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