JBL 4311 Vintage Studio Monitors with Stands - WOW

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General:
First time we've had the pleasure of having these wonderful monitors in the shop and WOW, they sure look and sound amazing.

Featuring a 3-way design providing a full bodied warm vintage sound that most of us are after. Likely from the late 1970's. 

We did some cosseting work to get them looking amazing and the finish is now deep, supple, and superb. 

We installed new vintage and correct foam on tweeters, and opened up each speaker clean all the controls which were fairly dirty. These are now good to go for another 50 years. 

To top it off, we sourced a perfectly matching set of stands from JBL which fit like a glove and complete the vintage look.

Ownership:
Second Owner

Connections:
Speaker binding posts

General Sound:
Smooth, uncolored, undistorted natural and clean

Cosmetic Condition:
8/10 = Very Good. Excellent front faceplate, one minor flaw on chassis side or top. 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: 45Hz to 15kHz
- Power Handling: 75W 
- Crossover Frequency: 1500, 6000Hz 
- Impedance: 8Ω 
- Sensitivity: 91dB 
- Bass: 1 x 300mm long throw
- Midrange: 1 x 130mm cone
- Tweeter: 1 x 36mm direct radiator
- Enclosure: bass reflex
- Grille: black fabric
- Finish: textured gray, oiled walnut
- Year: 1978

Dimensions - Each Speaker
23" x 14" x 11"

Weight - Each Speaker
42 lbs.

Approximate Age:
1978

Link to Manual:
Click Here

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.