JBL 4311 A Control Monitor, 1976-1980, made in Japan

Link: hifiengine
Method 3-way 3 speaker bass-reflex system, and a book shelf type
Use unit

• For low-pass: 30cm cone type (2213)
• For the mid-range: 13cm cone type (LE5-2)
• High-frequency: 3.6cm cone type (LE25)

Frequency characteristic 45Hz ~ 15kHz ± 3dB
Directional (horizontal and vertical) 90 °
Permissible input 40W (RMS)
Impedance 8Ω
Crossover frequency 1.5kHz, 6kHz
Output sound pressure level 91dB (new JIS)
Enclosure in the volume 42.5L
Dimensions Width 362 × height 597 × depth 298mm
Weight 19kg