JBL 4320

Commentary

Two way studio monitor.

A 38 cm cone type woofer 2215B is mounted in the low range.
This unit uses a molded bubble ring edge developed by JBL to enable cone vibration of more than 1.27 cm, and the lowest resonance frequency is 20 Hz.

A horn type tweeter composed of a driver 2420 and a horn lens 2391 is mounted in the high range.
The 2420 uses a 0. 05-mm-thick duralumin alloy diaphragm to achieve wide-band reproduction of more than four octaves, and a pure silver impedance control ring to increase radiation efficiency to the highest audible frequency range.
The driver is equipped with a horn lens 2391 to improve directional characteristics. The 2391 consists of 11 inclined plates arranged at a 38 ° angle with 6.3 mm spacing, and the front face of the lens has an accurately calculated hyperbola.

The enclosure is constructed using a 19 mm thick plank.

Model Rating

Method	2-Way, 2-Speaker, Bass Reflex System, Floor Type
Units Used	For low band : 38 cm cone type (2215B) For High Frequency : Horn Type (2420 + 2391)
Frequency characteristic	40 Hz to 15 kHz ± 3 dB
Directional property	45 ゜ x120 ゜
Maximum allowable input	60W(RMS) 120W (continuous program)
Impedance	8 Ω ~ 16 Ω
Sensitivity	97 db (New JIS)
Crossover frequency	800Hz
External dimensions	Width 610x Height 760x Depth 510 mm
Weight	39kg