8M70V2 - 22-12-10.p65
8M70-V2
LOW & MID FREQUENCY TRANSDUCER
KEY FEATURES
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•
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Excellent power handling (90 w RMS)
Good sensitivity (95 dB)
Smooth frequency response and low distortion
Designed for the low and mid frequency
DIMENSION DRAWINGS
TECHNICAL SPECIFICATIONS
Nominal diameter
Rated impedance
Minimum impedance
Power capacity*
Program power
Sensitivity
Frequency range
Recom. enclosure vol.
Voice coil diameter
Magnetic assembly weight
BL factor
Moving mass
Voice coil length
Air gap height
200 mm. 8 in.
8 ohms
6.3 ohms
90 w RMS
180 w
95 dB 2.83v @ 1m @ 2π
120 - 9000 Hz
20 / 50 l 0.7 / 1.77 ft.3
38.5 mm. 1.5 in.
2.75 kg. 4.18 lb.
9.8 N / A
0.019 kg.
6 mm
6 mm
MOUNTING INFORMATION
90 Hz
5.9 ohms
3.52
0.76
0.62
10.54 l
156 µm / N
2.58 kg / s
1.1
0.022 m2
1 mm
100 cm3
0.9 mH
212 mm.
198.3 mm.
8.34 in.
7.80 in.
180 mm. 7.08 in.
190 mm. 7.48 in.
90 mm. 3.54 in.
1.5 l. 0.052 ft.3
2.33 kg. 5.13 lb.
2.54 kg. 5.59 lb.
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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Resonant frequency, fs
D.C. Voice coil resistance, Re
Mechanical Quality Factor, Qms
Electrical Quality Factor, Qes
Total Quality Factor, Qts
Equivalent Air Volume to Cms, Vas
Mechanical Compliance, Cms
Mechanical Resistance, Rms
Efficiency, ηo (%)
Effective Surface Area, Sd (m2)
Maximum Displacement, Xmax***
Displacement Volume, Vd
Voice Coil Inductance, Le @ 1 kHz
Overall diameter
Bolt circle diameter
Baffle cutout diameter:
- Front mount
- Rear mount
Depth
Volume displaced by driver
Net weight
Shipping weight
056
THIELE-SMALL PARAMETERS**
8M70-V2
LOW & MID FREQUENCY TRANSDUCER
FREE AIR IMPEDANCE CURVE
FREQUENCY RESPONSE AND DISTORTION
056
Polígono Industrial Moncada II · C/. Pont Sec, 1c · 46113 MONCADA - Valencia (Spain)
· Tel. ( 34 ) 96 130 13 75 · Fax ( 34 ) 96 130 15 07 · http://www.beyma.com · E-mail: beyma@beyma.com ·
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Note: on axis frequency response measured with loudspeaker standing on infinite baffle in anechoic chamber, 1w @ 1m.
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