JBL 4312B MKII is a refined evolution of JBL’s legendary 43xx studio monitor lineage, preserving the iconic “West Coast” sound while offering improved balance and reliability. Widely appreciated by both professionals and audiophiles, the 4312B MKII delivers punchy, authoritative bass, a forward and articulate midrange, and clean, detailed highs.
This model is highly regarded for its energetic presentation, accuracy, and unmistakable JBL studio character—making it a standout choice for serious listening and vintage audio collections.
- CONDITION: Excellent – Fully Restored, tested, and cleaned
- MODEL: 4312B MKII
- TYPE: 3-way, 3-driver studio monitor loudspeaker system
- PROTECTION PLAN: 1-Year Warranty Included
- FREE SUPPORT: Must be used before requesting return
- SKU: 12QE0081
Customer Service:
Once your item arrives, if you have questions about how your item functions or proper settings, please CONTACT US.
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“If you have any vintage audios (receivers, speakers, cassette, reel to reel...) & want to upgrade with the serviced one, don't hesitate to contact us for the best deal. You only need to pay for the difference between yours & mine....”
Note:
The actual color of the product may sometimes differ slightly from the photos due to lighting conditions, temperature, and the device used. Some angles in the photos may not fully reflect the product’s condition. Please read the description carefully and feel free to message us if you have any questions.
- Type: 3 way, 3 driver loudspeaker system
- Frequency Response: 45Hz to 22kHz
- Power Handling: 100W
- Crossover Frequency: 2000, 5000Hz
- Impedance: 6Ω
- Sensitivity: 95dB
- Bass: 1 x 300mm cone
- Midrange: 1 x 125mm cone
- Tweeter: 1 x 25mm titanium dome
- Enclosure: bass reflex
- Dimensions: 23.50 x 14.25 x 11.77 inch
- Weight: 44.09 lbs
- Fully Restored Electronics: Recapped and circuit-checked for long-term reliability
- Classic JBL Studio Sound: Dynamic, forward, and highly engaging
- Powerful 12″ Woofer: Tight, impactful bass response
- Accurate Midrange & Clear Highs: Ideal for monitoring and critical listening
- Highly Collectible MKII Version: Refined tuning with classic JBL character
This pair of JBL 4312B MKII speakers has undergone a comprehensive restoration process, focusing on both electronic reliability and sonic performance.
Complete Crossover Restoration:
All capacitors in the crossover networks were fully inspected and replaced with new, high-quality components, restoring proper frequency response, clarity, and long-term stability.
Circuit & Signal Path Check:
The entire signal path was carefully inspected. All related circuitry was tested to ensure correct operation and consistent performance across both speakers.
Driver Inspection & Testing:
Woofer, midrange, and tweeter units were individually inspected and tested to confirm proper operation, clean output, and smooth integration with the restored crossover network.
Impedance & Balance Verification:
Each speaker was checked to confirm correct impedance and balanced output between left and right channels, ensuring accurate stereo imaging.
Terminal & Connection Service:
Speaker terminals were cleaned, secured, and tested to guarantee reliable signal transfer.
Cabinet & Exterior Detailing:
Cabinets were cleaned and detailed, preserving the original studio monitor appearance while improving overall presentation.
Extended Final Listening Test:
After restoration, the speakers were tested with reference music to verify tonal balance, dynamics, and the unmistakable JBL 4312B MKII sound signature—tight bass, forward mids, and clear highs.
Result:
The JBL 4312B MKII now delivers its full potential with restored clarity, stability, and impact. Both speakers perform evenly and confidently, offering an engaging and powerful listening experience backed by restored electronics and classic JBL studio sound.
⚠️ Note: Speaker stands are not included.
✅ Backed by 1-Year Warranty (repair or replacement)
- Marantz 2270 / 2285B Receiver – Warm tone balances JBL’s forward character
- Sansui AU-717 Integrated Amp – Strong control with classic Japanese warmth
- Kenwood KR-6600 Receiver – Musical, dynamic vintage pairing
🎁 GET A $100 VOUCHER INSTANTLY WHEN YOU BUY A COMBO!
Secure Packaging:
- Each unit is carefully packed using:
- Nylon wrap and sealed inner carton
- Custom EPE foam corners to protect edges
- Double-wall outer box for shock resistance
- Plastic straps + handling labels to ensure safe transit
Shipping Details:
- Dispatch Time: Ships within 3 business days
- Carrier: UPS Ground (tracked & insured)
- Signature Required: Yes (as buyer's request)
- Transit Time: Typically 3–7 business days (USA)
International Shipping:
We offer global delivery through the eBay International Shipping Program. eBay handles customs, duties, and tracking.
📦 Note: Packaging may vary slightly depending on unit size or model, but safety and protection are always our top priority.
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We provide shipping to the contiguous 48 United States, on most items. Shipping fees to ALL OTHER LOCATIONS will be calculated individually and added to customer invoices. HQaudios is also not responsible for any taxes, local duties, or fees outside of the USA and those are not included in the sale price or ship charge. In the event that the customer refuses a shipment, all shipping costs to and from the country or State in which the item was shipped to are not refunded. Please note, in some cases return shipping can cost as much as double the original ship cost.
All shipments are processed within 03 business days of payment, whenever possible. In the event of stock issues causing a delay, customers will be promptly notified, and alternative shipment arrangements will be made. Customers are responsible for any charges incurred due to failed delivery attempts or re-delivery.
Our customers' satisfaction means everything to us. Once you get this item, feel free to contact us if it has any problems! I will try to answer any questions that you may have in a timely fashion.
Return Policy: FREE SUPPORT SERVICE MUST BE UTILIZED BEFORE REQUESTING ANY RETURN, FOR ANY REASON. Items may be exchanged within 30 days if defective or not as described, with a full refund of the purchase price if an exchange is unavailable. If due to seller error, we will issue a prepaid return label or arrange for reimbursement of return shipping expenses as per this policy, not exceeding the original shipping cost. The address for returning shipment: 10851 Capital Ave, Garden Grove CA 92843 Returned items may require inspection before determining fault. The item must be received in its original, unaltered condition with all original packaging. Electronic items cannot be opened or tampered with; sealed items must remain sealed, and "Excellent" items must remain in "Excellent" condition. No returns will be accepted without first contacting us for Free Support, troubleshooting, or evaluation.
Warranty Policy: The warranty covers technical parts for up to 12 months from the date of receipt, provided there is valid evidence and the item remains sealed, unaltered, and has not been disassembled or internally inspected/repaired. Please note that shipping costs for warranty service will be the seller's responsibility if the item is found to be defective.
⚠ Important Notice: To ensure a smooth warranty process, we kindly request that you record a video while unboxing your package upon delivery. Any claims related to product damage or warranty service must be supported by clear video and photographic evidence. Please submit all required documentation to the official HQaudios email for prompt assistance.
***Failure to provide sufficient information as per our guidelines may result in the rejection of your request
⚠ For high-value products: Due to the nature of these products, we prioritize fast processing for orders from eBay account holders who have been established for at least 3 years, with a successful transaction rate and feedback score of 99% or higher. For other cases, we will carefully consider the order and proactively contact the buyer to provide prompt support.
Shipping Policy: This is for local pickup or we will ship it very carefully so that it arrives in good shape like it is now.
We provide shipping to the contiguous 48 United States, on most items. Shipping fees to ALL OTHER LOCATIONS will be calculated individually and added to customer invoices. HQaudios is also not responsible for any taxes, local duties, or fees outside of the USA and those are not included in the sale price or ship charge. In the event that the customer refuses a shipment, all shipping costs to and from the country or State in which the item was shipped to are not refunded. Please note, in some cases return shipping can cost as much as double the original ship cost.
All shipments are processed within 03 business days of payment, whenever possible. In the event of stock issues causing a delay, customers will be promptly notified, and alternative shipment arrangements will be made. Customers are responsible for any charges incurred due to failed delivery attempts or re-delivery.
Our customers' satisfaction means everything to us. Once you get this item, feel free to contact us if it has any problems! I will try to answer any questions that you may have in a timely fashion.
Return Policy: FREE SUPPORT SERVICE MUST BE UTILIZED BEFORE REQUESTING ANY RETURN, FOR ANY REASON. Items may be exchanged within 30 days if defective or not as described, with a full refund of the purchase price if an exchange is unavailable. If due to seller error, we will issue a prepaid return label or arrange for reimbursement of return shipping expenses as per this policy, not exceeding the original shipping cost. The address for returning shipment: 10851 Capital Ave, Garden Grove CA 92843 Returned items may require inspection before determining fault. The item must be received in its original, unaltered condition with all original packaging. Electronic items cannot be opened or tampered with; sealed items must remain sealed, and "Excellent" items must remain in "Excellent" condition. No returns will be accepted without first contacting us for Free Support, troubleshooting, or evaluation.
Warranty Policy: The warranty covers technical parts for up to 12 months from the date of receipt, provided there is valid evidence and the item remains sealed, unaltered, and has not been disassembled or internally inspected/repaired. Please note that shipping costs for warranty service will be the seller's responsibility if the item is found to be defective.
⚠ Important Notice: To ensure a smooth warranty process, we kindly request that you record a video while unboxing your package upon delivery. Any claims related to product damage or warranty service must be supported by clear video and photographic evidence. Please submit all required documentation to the official HQaudios email for prompt assistance.
***Failure to provide sufficient information as per our guidelines may result in the rejection of your request
⚠ For high-value products: Due to the nature of these products, we prioritize fast processing for orders from eBay account holders who have been established for at least 3 years, with a successful transaction rate and feedback score of 99% or higher. For other cases, we will carefully consider the order and proactively contact the buyer to provide prompt support.
For full policy details, please visit our ABOUT US page.
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