Brush up with interior and exterior maintenance! JBL's 4311A was developed as a monitor speaker for studios, etc. I would definitely recommend this system to customers who listen to jazz and rock, with good overall sound tightness and a nice low range. The exterior is generally clean due to maintenance. Serial 25123 24283 (Asaine Tomonori)
Maintenance information: 2023.1.27 Maintained (full exterior paint exterior repair, plate deposit peeling, gloss adjustment paint, saran frame repair, paint, net replacement, all units, cone paper coating, woofer maintenance (cleaning/dump agent application, frame polish), mid-maintenance (center cap gap filling, one-side magnetic circuit, rust removal, cleaning center adjustment, 1 terminal replacement, frame polish), tweeter maintenance (urethane (New ring created) Unit detachable internal connection terminal (FASTON) brand new replacement ATT brand new replacement frequency characteristic measurement check (~ approx. 42 kHz) was performed, and the original capacitor was continuously used for good results. Input/output waveform and balance confirmation sound output check)
Accessories: saran net
Main specifications: 3-way 3-speaker bass reflex system bookshelf type usage unit/30cm cone type for low range (2213) /13cm cone type for mid 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 91 dB Dimensions W362 x H597 x D298 mm weight 198 mm
Refresh yourself with interior and exterior maintenance! JBL's 4311A was developed as a monitor speaker for studios, etc. I would definitely recommend this system to customers who listen to jazz and rock, with good overall sound tightness and a nice low range. The exterior is generally clean due to maintenance. Serial 28342 28679 (Hiroki Aso)
Maintenance information: 2023.3.27 Maintained (full exterior paint, exterior repair, terminal board gap correction plate adjustment paint, saran frame repair, reinforcement paint, net replacement, woofer maintenance (cone paper paint, edge dump agent application, frame polish), mid maintenance (frame polish, cone paper paint), tweeter maintenance (new sponge ring installation, center cap repair, cone paper coating), unit detachment) internal connection (New terminal (FASTON) replacement ATT replacement frequency characteristic measurement check (~ approx. 42 kHz), continue using the original capacitor for good results, input/output waveform and balance confirmation sound check)
Accessories: saran net
Main specifications: 3-way 3-speaker bass reflex system bookshelf type usage unit/30cm cone type for low range (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 91 dB Dimensions W362 x H597 x D298 mm weight 198 mm
Brush up with interior and exterior maintenance! JBL's 4311A was developed as a monitor speaker for studios, etc. I would definitely recommend this system to customers who listen to jazz and rock, with good overall sound tightness and a nice low range. The exterior is generally clean due to maintenance. Serial 28196A 31365A (Asaine Tomonori)
Maintenance information: 2023.1.27 Maintained (all exterior paint exterior cleaning/repair plate cleaning/gloss adjustment paint
Saran Frame Reinforcement Paint Net Replacement All Units Cone Paper Coating Woofer Maintenance (Cleaning/Dump Agent Application Frame Polish) Mid Maintenance (1 Terminal Replacement, Frame Polish) Tweeter Maintenance (New Urethane Ring Creation) Unit Detachable Internal Connection Terminal (FASTON) Brand New Replacement ATT contact cleaning contact grease application frequency characteristic measurement check (~ approx. 42 kHz) was performed, and the original capacitor was continuously used for good results. Input/output waveform and balance confirmation sound output check)
Accessories: saran net
Main specifications: 3-way 3-speaker bass reflex system bookshelf type usage unit/30cm cone type for low range (2213) /13cm cone type for mid 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 91 dB Dimensions W362 x H597 x D298 mm weight 198 mm
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 condition is clean due to exterior maintenance. Serial 17062A 16956A (Nobuyuki Takahashi)
Maintenance information: 2022.9.1 Maintained (internal connection terminal (faston) new replacement (other than input). Open the back cover of the ATT and apply contact grease to the contacts. Frequency characteristic measurement check (~ about 42kHz) is performed, and the original capacitor is continued to be used for good results. (Check input/output waveform and balance, sound output check.) (Exterior full paint exterior gap/chip repair Saran frame reinforcement/painting/net replacement All units cone paper painting/frame polishing Woofer maintenance (edge dump agent application, center cap crack repair on one side ) Tweeter maintenance (center cap dent correction on one side, internal cleaning) 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
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
Refresh yourself 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 beautifully finished. Serial 28461 28770 (Nobuyuki Takahashi)
Maintenance information: 2022.6.30 Maintained (exterior repair/all painting saran frame reinforcement/painting/net replacement all units cone paper painting/frame polishing ATT cleaning/knob repair (Unit detachment/terminal replacement with a new one)
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 characteristic 45Hz to 15kHz Allowable input 40W (RMS) 8Ω Crossover frequency 1.5kHz, 6kHz Output sound pressure level 91dB W362×H597×D298mm 1 bottle 19 kg per
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 with good overall sound tightness and good low frequencies. Some of the lettering on the exterior has disappeared, but it is generally clean. Serial 26444 27900 (Yamato Yuki)
Maintenance information: 2022.3.14 operation confirmed
2021.8.25 Maintained (exterior repair/all painting. Create a new saran net. Unit cone paper coating Network maintenance (internal connection terminal (FASTON) new replacement. Contact cleaning, wiring re-solder, re-install and re-tighten for ATT replacement Frequency characteristic measurement check (~ approx. 42 kHz) is performed and the original capacitor is continued to be used for good results. Check input/output waveform, balance, and sound output. (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×D298mm Weight 19 kg
Brush up with internal and external maintenance! JBL's 4311A was developed as a speaker for monitors such as studios. It is a system that I would definitely recommend to customers who listen to jazz/rock with good overall sound tightness and good low frequency. The exterior is finished beautifully. Serial 26444/27900 (Kimiya Miura)
Maintenance information: 2021.8.25 Maintained (exterior repair, full painting. Create a new saran net. Unit cone paper paint Network maintenance (internal connection terminal (Faston) new replacement. ATT replaced for contact cleaning, wiring resoldering, reinstalling and retightening. Perform frequency characteristic measurement check (~ 42 kHz) and continue to use the original capacitor for good results. I/O waveform and balance check, sound output check. (Unit detachment)
Accessories: saran net
Main specifications: 3-way, 3-speaker, bass ref system, bookshelf type use unit/30cm cone type (2213) for low range (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×D298mm Weight 19kg