JBL L40

Commentary

A bookshelf type speaker system developed with the aim of making sounds that are not conscious of the genre of music.

A 25 cm cone woofer 127A is installed in the low range.
The cone paper uses a unique ribbed corn in order to reproduce a wide band flat while reducing distortion due to split vibration. The voice coil uses a precision 5 cm diameter copper ribbon edgewise winding, enabling stable operation even when Dainyu is strong. The magnetic circuit uses JBL's unique Alnico V magnet.
A 10-cm-diameter center dome is installed in the center of the diaphragm to improve the characteristics of the mid - and high-frequency range. This enables flat reproduction of bands with a large amount of information. In addition, unnecessary resonance is suppressed by adopting an aluminum die-cast frame.
The L40 greatly improves the impedance characteristics by covering the back of the woofer with a shell originally developed by JBL. This shell is made of glass wool and molded into a basket shape. It does not stop the movement of the corn paper and acts as damping, making the impedance characteristics and reproduction frequency characteristics of the woofer flatter.

A 2.5 cm dome type tweeter 033 is installed in the high range.
The diaphragm is phenol-treated hard, and by optimizing the stiffness, it is able to reproduce more faithfully beyond the audible range, and by adopting a small-diameter dome shape, the directional characteristics are greatly improved.
The voice coil uses the same 2.5 cm diameter aluminum ribbon wire edgewise winding as the dome diameter, and the magnetic circuit uses a strong 14,000 gauss magnetic circuit.

The network section is designed based on circuits developed for professional use such as studio monitors. It uses carefully selected parts such as low-loss inductors, capacitors with excellent characteristics, high-precision coils and resistors.
In addition, this circuit is equipped with a continuously variable level control for high frequency, and the level of the dome type tweeter can be freely adjusted according to the acoustic characteristics of the listening room and the desired sound quality.

The enclosure is made of 19 mm thick high-density compressed material for excellent robustness and durability. The sound absorbing material inside the enclosure absorbs standing waves.

The exterior has a walnut finish.
Also, as for the grill color, there were 3 colors of brown, red and camel.

Model Rating

Method	2-Way, 2-Speaker, Bass Reflex System, Bookshelf Type
Units Used	For low band : 25 cm cone type (127A) For High Pass : 2.5 cm Dome Type (033)
Directional property	150 ° (15 kHz) 90 ° (20 kHz)
Allowable input	35W (continuous program)
Impedance	8 Ω
Crossover frequency	1.8kHz
Output sound pressure level	88dB/W/m (New JIS) 75dB/1W/4.6m
External dimensions	Width 381x Height 584x Depth 302 mm
Weight	20 kg (when packed)