Audio Database


JBL L150
210,000yen(one-set, around the 1979 time)

The speaker system developed aiming at the play of the amount level of Oto which makes it bear a close resemblance to a live performance as it is.

128H of the diameter of 30cm is adopted as low-pass.
A 4.7kg magnetic circuit is carried in this unit. In this first unit to adopt a ferrite magnet by JBL, the technology of a SFG= symmetrical magnetic-field type is adopted.
This has prepared the Faraday loop in the pole piece lower in order to aim at the distorted falloff which adopts the structure of the magnetic-field candidate which moreover employed the point with few secular change of magnetic property efficiently by the low distortion which is a merit of a ferrite, and is produced from a magnetic-flux inter-modulation. Thereby, the physical characteristics of a Woofer, such as a low-pass property and input characteristics-proof, are improving sharply.
The optimal mass, hard cone paper, a copper ribbon line edgewise volume voice coil of the diameter of 7.5cm with density, etc. are adopted as vibration system.

In order to lengthen a response to super-low-pass one and to improve a dynamic range, diameter passive radiator PRof 30cm of new development 300 is adopted.

LE5-10 of the diameter of 13cm is adopted as a mid range.
The hard thing was adopted as cone paper and the thing with a flux density of 14000 gauss is adopted as the thing of the copper ribbon line of the diameter of 2.2cm of the precision design which is stable also to an excessive input in the voice coil, and a magnetic circuit.

033 which is a diameter dome shape tweeter of 2.5cm is adopted as a high region.
The diaphragm has adopted the thing made from the linen of a resin impregnation, and its linearity is good also to a pulsive upper register signal at adoption of the diameter aluminum ribbon line voice coil of 2.5cm, or a 14000 gauss magnetic circuit, and it has a sound distorted also at the time of the Oide power which is not.

The big modification was added, relation of an inter-unit was made smooth much more, the included circuitry was uniquely printed-circuit-board-ized in the network, and a phase revise circuitry, an impedance corrective network, etc. which prevent the phase disorder of an inter-unit are adopted as it.
Moreover, the succession variable level control is carried in the object for inside compasses, and upper register.

The enclosure has adopted the hard particle board of 1.9cm thickness as an overall.


Rating of a mode
Scheme 3 ways, 3 loudspeaker passive radiator scheme, and a floor type
Using unit For low-pass: 30cm cone type (128H)
For mid ranges: 13cm cone type (LE5-10)
For high regions: 2.5cm dome shape (033)
Passive radiator :P R300
Exclusive 3 way network
Allowable input 200W (succession special NetWare program)
Impedance 8ohms
Cross over frequency 1000Hz, 4000Hz
Output sound pressure level 88dB (new Japanese Industrial Standard)
Dimensions Width 432x height 1054x depth of 330mm
Weight 36.4kg