工程用专业会议话筒 PREAK

鹅颈话筒均使用了合金音频变压器的电路设计，使声音清晰、干净、悦听，克服了其它电路设计的品质稳定性问题。尤其是实现远距离传送，也只有极少的高频衰减，保证音色依然纯美。

mx 412d专业智能会议话筒

产品介绍
model variations
mx412d:304.8 mm (12 in.) desktop mini-condenser, gooseneck-mounted microphone.
specifications
frequency response(figure 1)
50 to 17,000 hz
polar pattern(figure 2)
output impedance(at 1,000 hz)
rated at 150 ω (180 ω actual)
open circuit sensitivity
at 1 khz, ref. 1 v per pascal*
cardioid: –33.5 dbv (21.1 mv)
supercardioid: –32.5 dbv (23.7 mv)
omnidirectional: –28.0 dbv (39.8 mv)
* 1 pascal=94 db spl
maximum spl(1khz at 1% thd, 1 kω load)
cardioid: 123.0 db
supercardioid: 122.0 db
omnidirectional: 117.5 db
e output noise(a-weighted)
cardioid: 29.0 db spl
supercardioid: 28.0 db spl
omnidirectional: 70.5 db spl
signal to noise ratio(referenced at 94 db spl)
cardioid: 65.0 db
supercardioid: 66.0 db
omnidirectional: 70.5 db
dynamic range with 1 kωload
94.0 db
common mode rejection
45.0 db minimum
mute switch attenuation
50.0 db minimum
preamplifier output clipping level(1% thd)
–6.0 dbv (0.5 v)
polarity
positive sound pressure on diaphram produces positive voltage
on pin 2 relative to pin 3 of xlr output connector.
power re
11 to 52 vdc phantom, 2.0 ma
environmental re
operating temperature range: –18° to 57° c (0° to 135° f)
relative humidity: 0 to 95%
dimensions(figure 3)
weight
mx412d: 0.81 kg (1.80 lbs.) net, 1.63 kg (3.62 lbs.) packaged
cable type(figure 7)
the attached custom cable contains a shielded audio pair and
three unshielded conductors for logic control.
overall diameter=0.6 mm (0.165 in.)
certification
eligible to bear ce marking. conforms to european emc
directive 89/336/eec. meets applicable tests and performance
criteria in european standard en55103 (1996) parts 1 and 2, for
residential (e1) and light industrial (e2) environments