JBL 4312 Vintage Speakers - Serviced w/Restored Cabinets

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General:
Vintage JBL speakers from this era are absolute classics. Iconic design meets great engineering. 

This particular set lived an easy life in someone's home since new (single owner), as so many of these vintage JBL monitors were used in pro recording studios because of their revealing and detailed sound. And as a result from studio use they are usually pretty rough and have huge wall/ceiling mounting holes in their cabinets.

This pair arrived with good drivers and front cosmetics, but the cabinets needed a good deal of work. We spent several hours carefully making them look as good as they sound.

We removed both crossover boards and cleaned the front-mounted controls to ensure noise free operation of the mid and treble adjustments. This requires disassembling almost the entire front of the speaker for proper access while being super careful to avoid damaging the front panel cosmetics. 

Included along with the speakers will be their original grills.

SkyFi Cosmetic Notes:
This pair of speakers was well-loved. They came from a single owner who had them from new. The cabinets sustained multiple blemishes throughout their long life.

We repaired some of the edge damage, filled a handful of screw holes, and touched up the finish.

Overall they present well with a character rich patina reflecting years of enjoyment by the previous owner. 

The dust caps on the tweeters have been retouched to restore their original domed shape.

SkyFi Technical Notes:
As part of the service that we completed on these speakers, we removed the crossover boards and cleaned the controls to ensure noise free operation of the mid and treble adjustments.

Shipping:
We will create custom packing for both speakers to ensure safe travels to your home see our packing video below for more specifics.

We'll create this custom packing and ship these via UPS Ground anywhere within the lower 48 US States for a flat $249. If you're outside of this area please contact us for a quote as we ship worldwide. Local courier available from our shop within 25 miles, and local pickup is welcome.

Please note these speakers are exempt from any SkyFi free or discounted shipping promotions that may be in effect. 

Ownership:
Single Owner

Connections:
Speaker spring terminals

Cosmetic Condition:
5/10 = Average. Multiple scratches, including some on the front faceplate. See our detailed rating description here.

Working Condition:
Working perfectly and tested in our lab and listening room.

Included:
Exactly as pictured and described above.

Packing:
Will be packed using our highly developed in-house process and custom packing materials.Specs:
Type: 3 way, 3 driver loudspeaker system
Frequency Response: 45 Hz to 15 kHz
Power Handling: 200W
Crossover Frequency: 1500Hz, 6000Hz
Impedance: 8 Ω
Sensitivity: 91 dB
Bass: 1 x 300mm paper cone 
Midrange: 1 x 130mm paper cone 
Tweeter: 1 x 36mm paper cone 
Enclosure: bass reflex

Dimensions - Each Speaker:
23.5" x 14.25" x 11.73" (597 x 362 x 298mm)

Weight - Each Speaker:
52 lbs.

Recommended Cables:
Kimber Kable - Speaker Cables - Good

Kimber Kable - Speaker Cables - Better

Kimber Kable - Bi-Wire Speaker Cables - Best

Testing Process:
Our speaker evaluation process starts with a visual inspection of all drivers. We are looking for damaged or deteriorating woofer surrounds, dented tweeter domes, and cone damage. We also inspect the speaker connection points for loose or broken connectors.

After the initial visual inspection we connect the speakers to a reference amplifier with our preferred test tracks. With the speakers placed with proper distance we listen to each driver to make sure that they are producing the intended frequencies with no signs of distortion or rattle.

During listening tests with test tracks we check for proper stereo imaging and bass response at various listening levels. If there are any audible signs of issues, the speakers are taken to the bench where we perform a frequency sweep to isolate the issue so that it can be resolved by component repair or replacement.

Our subwoofer evaluation process starts with a visual inspection of all drivers. We are looking for damaged or deteriorating woofer surrounds, cone damage, or rubbing voice coils. We also inspect the input connections for damage.

After the initial visual inspection we connect the sub at our bench and perform a sine wave sweep from about 200 Hz down to around 10 Hz. During this sweep we are listening for excessive rattle or other signs of improper function.

If the sweep passes we then increase the input level to evaluate how the woofer performs at high output levels. If the woofer has built-in crossover adjustments or multiple connection options these features are tested at this time.

We complete the subwoofer evaluation by feeding the unit with an audio signal in conjunction with our house music system to see how it responds to low frequency content in real world conditions while paired with a full range system.