Thursday 27 December 2012

JBL 4301BWX 75,000yen(one-set, around the 1982 time) 93,000yen(one-set, around the 1983 time)

The compact monitor loudspeaker developed as an object for an edit of a broadcast station or a studio.

116H which is a 20cm cone type Woofer is adopted as low-pass.
It is suitably developed severely in pursuit of input characteristics-proof etc. for the monitor, and the Low-noise-izing is attained.
Moreover, the hard cone paper with a corrugation, the diameter voice coil of 5cm of a precision design, pole piece and gap which have improved the high region property, the frame made from aluminum die-casting, etc. were adopted, and the more smooth frequency characteristic is acquired.

LE26 of a 3.6cm direct radiator is adopted as a high region.
Adoption of hard cone paper and a center dome has realized the directional characteristics of level and 90 degrees (10kHz) of perpendicularities.
Moreover, the perimeter of a unit is wrapped in a resin system material with a taper, and while improving a consistency with a baffle board, the improvement in directional characteristics or energetics is aimed at.

The network part has adopted the thing in consideration of a phase response or an impedance correction.

19mm thickness high-density compressed is used for an enclosure. 

Scheme 2 ways, 2 loudspeaker bass-reflex scheme, and a bookshelf type
Unit For low-pass: 20cm cone type (116H)
For high regions: 3.6cm direct radiator (LE26)
Play frequency band 45Hz-15kHz±3dB
Directional characteristics 90 degrees (horizontal and vertical)
Cross over frequency 2500Hz
Impedance 8ohms
Output sound pressure level 88dB/W/m
Allowable input 15W(RMS)
Enclosure dimension 28L
Dimensions Width 291x height 483x depth of 306mm
Weight 12.7kg


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