Haut-parleur de studio Beyma SM-212
[SM-212-8] Avis/Critiques This 12” loudspeaker has been designed to reproduce the low and mid frequency
range. It features a 2.5” (62.4 mm) voice coil made with high quality materials:
copper round wire with high temperature bonding strength and fiber glass former.
Combining this with a massive magnet system with an appropriate rear air
ventilation results in a excellent power handling: 350 w AES. Moreover, it
incorporates a lightweight curvilinear cone that allows the driver to be used in
the low-mid frequency range. The SM-212 offers a compromise between good
efficiency, extended frequency response and reduced harmonic distortion. It is
recommended for small two or three way systems.
Key Features
- High power handling (350 w AES)
-
Excellent sensitivity: 98 dB
- 2.5" (62.4 mm.) copper voice coil with
polyimide fiber glass former
- Optimum winding length for increased linear
excursion
- Lightweight curvilinear cone
- Designed for low-mid
frequencies reproduction
Technical Specifications
Nominal diameter 300 mm. 12
in.
Rated impedance 8 ohms.
Minimum impedance 6.8 ohms.
Power capacity
* 350 w AES
Program power 700 w
Sensitivity 98 dB 2.83v @ 1m @
2p
Frequency range 45 - 6000 Hz
Recom. enclosure vol. 30 / 100 l 1.06 /
3.53 ft.3
Voice coil diameter 62.4 mm. 2.5 in.
Magnetic assembly weight
3.8 kg. 8.38 lb.
BL factor 12.8 N / A
Moving mass 0.044 kg.
Voice coil
length 20 mm.
Air gap height 7 mm.
X damage (peak to peak) 27 mm.
Mounting Informations
Overall diameter 312 mm. 12.3
in.
Bolt circle diameter 294.5 mm. 11.6 in.
Baffle cutout diameter:
-
Front mount 277.5 mm. 10.9 in.
- Rear mount 280 mm. 11 in.
Depth 132 mm.
5.20 in.
Volume displaced by driver 4 l 0.14 ft.3
Net weight 4.6 kg. 10.14
lb.
Shipping weight 5.3 kg. 11.69 lb.
Thiele and Small Parameters **
Resonant frequency, fs 40
Hz
D.C. Voice coil resistance, Re 5.8 ohms.
Mechanical Quality Factor, Qms
5.6
Electrical Quality Factor, Qes 0.4
Total Quality Factor, Qts
0.38
Equivalent Air Volume to Cms, Vas 150 l
Mechanical Compliance, Cms
350 mm / N
Mechanical Resistance, Rms 1.8 kg / s
Efficiency, ho (%)
2.3
Effective Surface Area, Sd (m2) 0.0550 m2
Maximum Displacement, Xmax 7
mm.
Displacement Volume, Vd 382 cm3
Voice Coil Inductance, Le @ 1 kHz 1.2
mH
Materials
Voice coil: copper round wire with high
temperature bonding strength. Polyimide fiber glass former able to withstand
high temperatures.
Cone: lightweight paper cone.
Surround: specially
treated cloth surround.
Spider: cotton spider.
Metal parts: effective
protection against corrosion.
Basket: specially designed die cast aluminium
basket to avoid disturbing resonances.
Magnet: high Curie temperature
ferrite.
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).
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