Brush up with internal and external maintenance! JBL's 4311A was developed as a monitor speaker for studios, etc. It is a system that I would definitely recommend to customers who listen to jazz/rock due to the good overall tightness of the sound and the low frequencies with good omission. The exterior is generally good. Serial 30166 31420 (Hiroshi Aso)
Maintenance information: 2022.7.31 Sound output checked (sweep test good) 2021.9.29 Maintained (exterior repair/all painting saran net newly created unit cone paper painting Network maintenance (internal connection terminal (faston) new replacement. Since the ATT has been replaced, the contacts are cleaned. Since the capacitor has been replaced with a Mundorf (Mcap EVO), a frequency characteristic measurement check (~ about 42 kHz) was performed to confirm that the results were good. Input/output waveform and balance check, sound output check) Unit detachment)
Accessories: saran net
Main specifications: 3-way, 3-speaker, bass reflex system, bookshelf type use unit/30cm cone type for low frequency (2213) /13cm cone type for middle range (LE5-2) /3.6cm cone type for high range ( LE25) Frequency characteristics 45Hz to 15kHz Allowable input 40W (RMS) 8Ω Crossover frequency 1.5kHz, 6kHz Output sound pressure level 91dB Dimensions W362 × H597 × D298 mm Weight 19kg