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Premium AI Voice Guide
PROLiam's bench-side rundown of the JBL 4311 Control Monitor.
Real-time streaming voice — specs, history, restoration pain points, market value.
Sonic Similarity Analysis
The 4309 carries forward the 4311's studio monitor DNA with professional-grade accuracy, boundary adjustment controls reminiscent of the original's level knobs, and that signature JBL clarity and punch. While the 4309 uses modern compression driver technology for improved detail retrieval, both speakers share the same mission: delivering studio-accurate sound in a compact bookshelf format with user-adjustable voicing.
JBL 4311 Control Monitor
vs.
JBL 4309
91 dB
Sensitivity
91 dB
8–8 Ω
Impedance
6–6 Ω
10–150W
Power Handling
25–150W
3-way
Driver Count
3-way
0.75in dome tweeter, 5in cone midrange, 10in woofer
Driver Config
1in compression driver, 4in midrange, 8in woofer
Bass-reflex
Enclosure
Bass-reflex
Bookshelf
Size
Bookshelf
45Hz – 20kHz
Frequency Response
45Hz – 40kHz
38 lbs
Weight
24.2 lbs
Vintage (used avg)
$650
Modern (new)
$1,800
Difference
$1,150more new
Cross-Match Engine · Pro
What pairs with this?
Reverse-match works both ways. Point us at a receiver and we surface compatible vintage speakers and turntables — matched on power, impedance, and era. Point us at a pair of speakers and we surface receivers with enough headroom to drive them cleanly. Available on Pro and Flipper Pro.
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