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<h2 style=”font-size:29px;color:#8A5A2B;margin:0 0 10px;”>Video Demo &amp; Sound Test</h2>
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<strong>A sound-demo video of this exact JBL 4311B pair is available on request so you can hear both speakers operating before purchase.</strong>
</p>
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<h2 style=”color: rgb(138, 90, 43); font-family: Arial, Verdana, sans-serif; font-size: 29px; margin: 0px 0px 14px;”>Key Highlights</h2>
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<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”><strong>JBL 4311B Control Monitor speaker pair</strong></li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”>3-way bass-reflex professional monitor design</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”>12-inch JBL 2213H white-cone woofer</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”>5-inch JBL LE5-10 midrange driver</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”>1.4-inch JBL LE25-2 high-frequency driver</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”>JBL 3112B passive crossover network</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”>1.5 kHz / 6 kHz crossover frequencies</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”>8-ohm nominal impedance</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”>91 dB SPL / 1W / 1m sensitivity</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”>45 Hz – 15 kHz ±3 dB frequency response</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”>75W continuous program power rating</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”>Front-panel midrange and high-frequency level controls</li>
<li style=””><font color=”#222222″ face=”Arial, Verdana, sans-serif”><span style=”font-size: 22px;”><b>Original JBL factory grey cabinet finish</b></span></font></li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”>Restored / rebuilt black grille assemblies</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”>Upgraded rear binding posts</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”>Professionally restored and tested by HQaudios</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”><strong>1-Year HQaudios Technical Warranty</strong></li>
</ul>
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<h2 style=”font-size:29px;color:#8A5A2B;margin:0 0 14px;”>Why This Model Is Notable</h2>
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The JBL 4311B is a compact three-way professional monitor from JBL’s classic studio-monitor era.
Its 12-inch woofer, dedicated midrange driver, front-panel level controls, and high sensitivity make it a recognizable member of the 4310 / 4311 family and a popular choice among collectors of vintage JBL professional monitors.
</p>
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<h2 style=”font-size:29px;color:#8A5A2B;margin:0 0 18px;”>Professional Restoration &amp; Testing</h2>

<h3 style=”font-size:25px;color:#333333;margin:0 0 10px;”>Before Restoration</h3>
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Initial inspection identified age-related cabinet wear, grille damage, worn mounting hardware, terminal damage, and deterioration consistent with long-term use and storage.
</p>
<p style=”margin:0 0 20px;”>
The cabinets, installed drivers, crossover sections, front level controls, terminals, grilles, labels, and mounting hardware were inspected to determine the work required for this specific pair.
</p>

<h3 style=”font-size:25px;color:#333333;margin:0 0 10px;”>During Restoration</h3>
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<li>Original factory grey cabinet finish carefully cleaned and cosmetically detailed</li>
<li>Woofer surrounds replaced and cones re-centered</li>
<li>Woofer cones and dust caps cleaned and cosmetically refreshed</li>
<li>Grille assemblies restored / rebuilt with new black cloth and replacement mounting pegs</li>
<li>Damaged rear terminal hardware upgraded to modern binding posts</li>
<li>Rusted mounting screws and hardware replaced as required</li>
<li>Front midrange and high-frequency level controls cleaned and treated</li>
<li>Reproduction badges / rear labels installed where original pieces were damaged or missing</li>
<li>Installed driver assemblies, accessible crossover areas, controls, and terminals carefully cleaned and detailed</li>
</ul>
<p style=”margin:0 0 20px;”>
All original JBL drivers were retained during restoration; their cones and diaphragms are original and in good condition.
</p>

<h3 style=”font-size:25px;color:#333333;margin:0 0 10px;”>Final Testing</h3>
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<li>Woofer, midrange, and high-frequency sections checked for proper operation</li>
<li>Front level-control operation verified across their usable range</li>
<li>Rear terminal operation checked</li>
<li>Driver polarity and left/right consistency verified</li>
<li>Extended real-world listening test completed</li>
</ul>
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<h2 style=”font-size:29px;color:#8A5A2B;margin:0 0 14px;”>Technical Condition</h2>
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All three driver sections on both speakers are operating and the pair has been tested for consistent left/right performance.
The front level controls and upgraded rear binding posts were checked after service.
</p>
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<h2 style=”font-size:29px;color:#8A5A2B;margin:0 0 14px;”>Sound Character</h2>
<p style=”margin:0;”>
The JBL 4311B delivers the direct, dynamic presentation associated with classic JBL control monitors.
The 2213H woofer provides punchy low-frequency output, the LE5-10 midrange gives strong vocal and instrument presence,
and the LE25-2 high-frequency driver adds crisp upper-frequency detail.
The front level controls allow the midrange and treble balance to be adjusted to suit the room and listening preference.
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<h2 style=”color: rgb(138, 90, 43); font-family: Arial, Verdana, sans-serif; font-size: 29px; margin: 0px 0px 14px;”>Cosmetic Condition</h2>
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This JBL 4311B pair presents in <strong>Very Good restored vintage cosmetic condition</strong>.
The cabinets retain their original JBL factory grey finish, paired with black baffles and restored black grilles.
</p>
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<li style=””><font color=”#222222″ face=”Arial, Verdana, sans-serif”><span style=”font-size: 22px;”><b>Cabinets: </b>Original JBL factory grey finish, professionally cleaned and detailed.</span></font></li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”><strong>Front Baffles:</strong> Black finish with the 4311B three-way layout</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”><strong>Grilles:</strong> Restored / rebuilt assemblies with new black cloth and replacement mounting pegs</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”><strong>Drivers:</strong> Original JBL drivers retained, cleaned, and serviced</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”><strong>Rear Panels:</strong> Upgraded binding posts installed</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”><strong>Badges / Labels:</strong> Reproduction pieces used where original items were damaged or missing</li>
<li style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px;”><strong>Stands:</strong> Display stands shown in photos are not included unless specifically stated otherwise</li>
</ul>
<p style=”color: rgb(34, 34, 34); font-family: Arial, Verdana, sans-serif; font-size: 22px; margin: 0px;”>
Please review all listing photos carefully, as they show the actual pair and form an important part of the cosmetic description.
</p>
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<h2 style=”font-size:29px;color:#8A5A2B;margin:0 0 14px;”>Specifications</h2>
<table style=”width:100%;border-collapse:collapse;font-size:22px;”>
<tbody>
<tr><td style=”padding:11px;border-bottom:1px solid #eeeeee;width:42%;”><strong>Brand</strong></td><td style=”padding:11px;border-bottom:1px solid #eeeeee;”>JBL</td></tr>
<tr><td style=”padding:11px;border-bottom:1px solid #eeeeee;”><strong>Model</strong></td><td style=”padding:11px;border-bottom:1px solid #eeeeee;”>4311B Control Monitor</td></tr>
<tr><td style=”padding:11px;border-bottom:1px solid #eeeeee;”><strong>Type</strong></td><td style=”padding:11px;border-bottom:1px solid #eeeeee;”>3-Way / 3-Driver Bass-Reflex Professional Monitor</td></tr>
<tr><td style=”padding:11px;border-bottom:1px solid #eeeeee;”><strong>Introduced</strong></td><td style=”padding:11px;border-bottom:1px solid #eeeeee;”>1979</td></tr>
<tr><td style=”padding:11px;border-bottom:1px solid #eeeeee;”><strong>Low Frequency Driver</strong></td><td style=”padding:11px;border-bottom:1px solid #eeeeee;”>JBL 2213H – 12-inch White-Cone Woofer</td></tr>
<tr><td style=”padding:11px;border-bottom:1px solid #eeeeee;”><strong>Midrange Driver</strong></td><td style=”padding:11px;border-bottom:1px solid #eeeeee;”>JBL LE5-10 – 5-inch Cone Midrange</td></tr>
<tr><td style=”padding:11px;border-bottom:1px solid #eeeeee;”><strong>High Frequency Driver</strong></td><td style=”padding:11px;border-bottom:1px solid #eeeeee;”>JBL LE25-2 – 1.4-inch Direct-Radiator High-Frequency Driver</td></tr>
<tr><td style=”padding:11px;border-bottom:1px solid #eeeeee;”><strong>Network</strong></td><td style=”padding:11px;border-bottom:1px solid #eeeeee;”>JBL 3112B</td></tr>
<tr><td style=”padding:11px;border-bottom:1px solid #eeeeee;”><strong>Crossover Frequencies</strong></td><td style=”padding:11px;border-bottom:1px solid #eeeeee;”>1.5 kHz / 6 kHz</td></tr>
<tr><td style=”padding:11px;border-bottom:1px solid #eeeeee;”><strong>Nominal Impedance</strong></td><td style=”padding:11px;border-bottom:1px solid #eeeeee;”>8 Ohms</td></tr>
<tr><td style=”padding:11px;border-bottom:1px solid #eeeeee;”><strong>Sensitivity</strong></td><td style=”padding:11px;border-bottom:1px solid #eeeeee;”>91 dB SPL / 1W / 1m</td></tr>
<tr><td style=”padding:11px;border-bottom:1px solid #eeeeee;”><strong>Frequency Response</strong></td><td style=”padding:11px;border-bottom:1px solid #eeeeee;”>45 Hz – 15 kHz ±3 dB</td></tr>
<tr><td style=”padding:11px;border-bottom:1px solid #eeeeee;”><strong>Power Rating</strong></td><td style=”padding:11px;border-bottom:1px solid #eeeeee;”>75 Watts Continuous Program</td></tr>
<tr><td style=”padding:11px;border-bottom:1px solid #eeeeee;”><strong>Controls</strong></td><td style=”padding:11px;border-bottom:1px solid #eeeeee;”>Front-Panel Midrange and High-Frequency Level Controls</td></tr>
<tr><td style=”padding:11px;border-bottom:1px solid #eeeeee;”><strong>Dimensions</strong></td><td style=”padding:11px;border-bottom:1px solid #eeeeee;”>Approx. 14.25 W × 23.5 H × 11.75 D inches each</td></tr>
<tr><td style=”padding:11px;border-bottom:1px solid #eeeeee;”><strong>Finish</strong></td><td style=”padding:11px;border-bottom:1px solid #eeeeee;”>Original JBL Factory Grey / Black Baffles / Black Grilles</td></tr>
<tr><td style=”padding:11px;”><strong>Restoration Updates</strong></td><td style=”padding:11px;”>Original grey finish preserved; restored / rebuilt grilles; upgraded binding posts; reproduction badges / labels where applicable</td></tr>
</tbody>
</table>
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<h2 style=”font-size:29px;color:#8A5A2B;margin:0 0 14px;”>What’s Included</h2>
<ul style=”margin:0;padding-left:30px;”>
<li><strong>1 Pair (2) JBL 4311B Control Monitor Speakers</strong></li>
<li><strong>Restored Black Front Grilles</strong></li>
</ul>
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Display stands are not included unless specifically stated. Only items clearly shown in the photos or specifically listed above are included.
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<h2 style=”font-size:29px;color:#8A5A2B;margin:0 0 14px;”>Suggested Pairing</h2>
<p style=”margin:0 0 14px;”>
With an 8-ohm nominal impedance and 91 dB sensitivity, the JBL 4311B works well with a wide range of clean vintage and modern amplification.
Avoid sustained clipping and use amplifier power appropriate to the speaker’s published capacity.
</p>
<p style=”margin:0;”>
Contact us for amplifier and complete-system matching. Package pricing may be available when purchasing compatible components together.
</p>
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<h2 style=”font-size:29px;color:#8A5A2B;margin:0 0 14px;”>Professional Packing &amp; Shipping</h2>
<p style=”margin:0;”>
Each speaker will be individually protected with reinforced packing around the custom-finished cabinet,
black baffle, woofer, midrange, high-frequency driver, grille, corners, and rear terminals.
Heavy-duty cartons and internal cushioning will be used to prevent movement and protect the pair during transit.
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<h2 style=”font-size:29px;color:#8A5A2B;margin:0 0 14px;”>1-Year HQaudios Technical Warranty</h2>
<p style=”margin:0 0 14px;”>
This JBL 4311B pair is backed by our <strong>1-Year HQaudios Technical Warranty</strong>
for qualifying functional issues under normal intended use and related to the restoration work performed by HQaudios.
</p>
<p style=”margin:0;”>
Warranty does not cover misuse, incorrect wiring, amplifier clipping, physical damage, unauthorized repair,
cosmetic wear, or operation outside the manufacturer’s intended specifications.</p>
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Authentic JBL 4311B 3-Way Control Monitor Speakers