JBL Professional 1 Series, 104 Compact Powered Desktop Reference Monitors

1. Overview

The JBL104 compact, full-range, powered reference monitors are designed to provide an accurate sonic presentation. These monitors are suitable for home recording enthusiasts, podcasters, video producers, and professionals requiring accurate portable reference monitors. The JBL104s feature 4.5-inch (118 mm) low-frequency drivers with coaxial 0.75-inch (19 mm) soft-dome tweeters, powered by a 60-watt amplification system. Their acoustic design aims to deliver exceptional imaging, neutral frequency response, and crisp detail. The compact form factor is designed to conserve workspace in various studio environments.

Figure 1: Front view of the JBL 104 Reference Monitors.

2. What's in the Box

The product package for the JBL 104 Reference Monitors includes the following items:

• 1x extension monitor speaker wire (2-Conductor, 2 meters)
• 1x 1/8-inch (3.5 mm) to RCA audio cable
• 1x AC power cable
• 1x quick setup guide

Figure 2: Included accessories and quick setup guide.

3. Setup

3.1 Placement

For optimal audio performance, position the JBL 104 monitors on your desktop. They are acoustically optimized for desktop placement to ensure accurate sound reproduction in near-field listening environments.

Figure 3: Example of JBL 104 monitors in a desktop setup.

3.2 Connections

The JBL 104 monitors offer versatile connectivity options to integrate with various audio sources:

• Balanced Inputs: Two 1/4-inch balanced inputs are available for connecting professional audio equipment, such as audio interfaces or mixing consoles.
• RCA Inputs: Two RCA inputs provide compatibility with consumer audio devices like CD players, turntables, or media players.
• Auxiliary Input: A single 1/8-inch (3.5 mm) unbalanced TRS input is located on the front panel for convenient connection of personal music players, smartphones, or other portable devices.

Ensure all cables are securely connected to the appropriate input ports on the rear of the master monitor and the front auxiliary input.

Figure 4: Rear panel connections for the JBL 104 monitors.

Figure 5: Front panel with volume control and auxiliary input.

3.3 Power Connection

Connect the supplied AC power cable to the power input on the master monitor and then to a suitable wall outlet. The monitors feature an integrated 60-watt Class D power amplifier, with 30 watts distributed to each speaker.

4. Operating Instructions

4.1 Volume Control

Adjust the overall output volume using the front-panel volume control knob on the master monitor. This allows for convenient level adjustments without needing to access the rear panel or your audio source.

4.2 Headphone Use

A front-panel headphone jack is provided for private listening. Plugging headphones into this jack automatically mutes the speakers, providing isolation in one simple step. Unplugging the headphones will restore audio output to the speakers.

4.3 Power Management

The JBL 104 monitors are designed for efficient power consumption. They may feature an automatic standby mode to conserve energy when no audio signal is detected for a period.

5. Features & Specifications

5.1 Key Features

• Compatible with most desktop and laptop computers, as well as home or professional recording equipment.
• Acoustically optimized for desktop placement.
• Three sets of inputs (1/4-inch balanced, RCA, 1/8-inch unbalanced) for diverse connectivity.
• Front-panel volume control and headphone jack with speaker mute feature for user convenience.
• Coaxial 4.5-inch (118 mm) LF driver and 0.75-inch (19 mm) soft-dome HF driver for accurate sound.
• Integrated 60-watt Class D power amplifier; 30 watts distributed to each speaker.

5.2 Technical Specifications

5.3 Product Video

6. Maintenance

Proper maintenance ensures the longevity and optimal performance of your JBL 104 monitors.

• Cleaning: Use a soft, dry cloth to clean the exterior surfaces of the monitors. Avoid using abrasive cleaners, waxes, or solvents as they may damage the finish.
• Dust Protection: Keep the monitors free from dust accumulation, especially around the speaker grilles and rear vents, to prevent overheating and maintain sound quality.
• Storage: If storing the monitors for an extended period, ensure they are kept in a cool, dry place, away from direct sunlight and extreme temperatures.
• Cable Management: Periodically check all cables for any signs of wear or damage. Replace damaged cables immediately to prevent electrical hazards or signal loss.

7. Troubleshooting

If you encounter issues with your JBL 104 monitors, refer to the following common troubleshooting steps:

• No Sound:
  • Ensure the power cable is securely connected and the power indicator light is on.
  • Check that the volume knob on the front panel is turned up.
  • Verify that the audio input cables are correctly connected to both the monitors and your audio source.
  • If headphones are plugged into the front jack, unplug them to enable speaker output.
  • Test with a different audio source or cable to rule out external issues.
• Distorted Sound:
  • Reduce the volume level from both the monitors and your audio source.
  • Check for loose cable connections.
  • Ensure the audio source is not sending an overdriven signal.
• Hum or Buzz:
  • Ensure all connections are secure.
  • Try plugging the monitors into a different electrical outlet, preferably on a different circuit.
  • Keep audio cables away from power cables to minimize interference.

For persistent issues, consult the full user guide or contact JBL Professional support.

8. Warranty & Support

8.1 Warranty Information

The JBL 104 Compact Powered Desktop Reference Monitors come with a basic warranty. For detailed terms and conditions, please refer to the official warranty documentation included with your product or available on the JBL Professional website.

8.2 Additional Resources

For further information, detailed instructions, or technical support, please refer to the following resources:

• Official User Guide (PDF)
• Visit the JBL Professional Store on Amazon for product updates and related accessories.