Introduction
The JBL 305P MkII 5" 2-Way Powered Studio Reference Monitors are designed to deliver professional-grade audio for creators in various fields, from music production to podcasting. Featuring patented Image Control Waveguide technology, these monitors provide precise imaging and a wide sweet spot, ensuring accurate detail in your mixes. Equipped with dual 41-Watt Class-D amplifiers, a 5-inch woofer, and a 1-inch tweeter, they produce deep bass and crisp highs. The monitors also include Boundary EQ and HF Trim controls for acoustic optimization in any studio environment. Built with 70 years of expertise, the 305P MkII combines durable MDF construction with flexible XLR/TRS inputs for lasting reliability and versatile connectivity.
What's in the Box
- (2) JBL 305P MkII Studio Monitors
- Power Cords (one for each monitor)
Setup
Placement
Position your JBL 305P MkII monitors on a stable surface, ideally at ear level, forming an equilateral triangle with your listening position. Ensure there is adequate space around the monitors for optimal sound dispersion and to prevent bass buildup if placed too close to walls.
Connections
Connect the power cords to each monitor and then to a power outlet. For audio input, use balanced XLR or 1/4-inch TRS cables to connect your audio interface or mixer to the corresponding inputs on the rear panel of each monitor. Balanced connections help minimize noise interference.

Image: Rear panel of the JBL 305P MkII Studio Monitor. This view shows the balanced XLR and 1/4-inch TRS inputs, power input, and various control switches for adjusting sound characteristics.
Video: This video demonstrates the physical connections on the rear panel of the JBL 305P MkII monitor, including power and audio inputs, and highlights the various control options.
Operating Your Monitors
Power On/Off
Locate the 'ON/OFF' switch on the rear panel of each monitor. Flip the switch to 'ON' to power up the monitors. The JBL logo on the front will illuminate when the monitor is active. Always power on your monitors after your audio source and power them off before your audio source to prevent sudden loud noises.
Controls
The rear panel of each 305P MkII monitor features several controls to fine-tune its performance to your environment and preferences:
- Input Sensitivity: A switch allows you to select between +4dBu (professional line level) and -10dBV (consumer line level) to match your audio source output.
- Boundary EQ: This switch helps compensate for bass response when monitors are placed near walls or corners. Options typically include 0dB, -1.5dB, and -3dB.
- HF Trim: Adjusts the high-frequency output to tailor the sound to your listening space or personal preference. Options typically include +2dB, 0dB, and -2dB.
- Volume: A rotary knob controls the overall output level of the monitor. It is recommended to set this to a moderate level and control the main volume from your audio interface or mixer.

Image: Detailed view of the JBL 305P MkII's rear panel. This image highlights the Input Sensitivity switch, Boundary EQ controls, HF Trim switch, and the Volume knob, which allow users to customize the monitor's sound output.
Key Features
- Patented Image Control Waveguide: Delivers precise, immersive sound with a wide sweet spot, ensuring every detail shines in your mixes.
- Dual 41-Watt Class-D Amplifiers: Provides dynamic range and deep bass through a 5-inch woofer and 1-inch tweeter.
- Boundary EQ and HF Trim Controls: Allows tailoring of low and high frequencies to suit any room acoustics, ensuring accurate mixes.
- Versatile Connectivity: Features balanced XLR and 1/4-inch TRS inputs with +4dBu/-10dBV sensitivity for compatibility with professional setups.
- Durable Design: Constructed with a 15mm MDF enclosure and ABS baffle, rigorously tested for 100-hour full-power reliability.
- Linear Spatial Reference Criteria: Guarantees faithful sound reproduction, making it a top choice for hobbyists and professionals.

Image: A close-up view of the JBL 305P MkII's patented Image Control Waveguide. This design element is crucial for delivering precise sound imaging and a broad, consistent sweet spot.

Image: An illustrative image emphasizing the dual Class-D power amplifiers integrated into the JBL 305P MkII monitor, which contribute to its dynamic range and powerful audio output.
Technical Specifications
| Feature | Specification |
|---|---|
| Input Voltage | 240 Volts |
| Mounting Type | Tabletop Mount |
| Material | Acrylonitrile Butadiene Styrene (ABS) |
| Model Name | 305P MKII pair |
| Speaker Type | Monitor |
| Special Feature | Built In Microphone |
| Recommended Uses For Product | For Music Studios |
| Compatible Devices | Desktop, Laptop |
| Subwoofer Diameter | 5 Inches |
| Unit Count | 1.0 Count |
| Surround Sound Channel Configuration | 2.0 |
| Color | Black |
| Included Components | (2) JBL 305P MkII |
| Product Dimensions | 9.9"D x 7.3"W x 11.75"H |
| Item Weight | 10.4 Pounds |
| Is Waterproof | FALSE |
| Warranty Type | 5 years |
| Number of Items | 2 |
| Control Method | Touch |
| Speaker Size | 5 Inches |
| Power Source | AC |
| Signal-to-Noise Ratio | 75 dB |
| Woofer Diameter | 5 Inches |
| Tweeter Diameter | 25 Millimeters |
| Water Resistance Level | Not Water Resistant |
| Customer Package Type | Standard Packaging |
| Audio Driver Type | Dynamic Driver |
| Audio Driver Size | 5 Inches |
| Subwoofer Connectivity Technology | Wired |
| Series Number | 30 |
| Manufacturer | JBL Professional |
| Speaker Maximum Output Power | 112 Watts |
| Frequency Response | 20 KHz |
| Connectivity Technology | XLR, 1/4 inch TRS |
| Audio Output Mode | Stereo |

Image: A diagram illustrating the dimensions of the JBL 305P MkII Studio Monitor, showing its height (11.75"), width (7.3"), and depth (9.9").
Maintenance
To ensure the longevity and optimal performance of your JBL 305P MkII monitors, follow these maintenance guidelines:
- Cleaning: Use a soft, dry cloth to wipe down the exterior of the monitors. Avoid using abrasive cleaners, solvents, or waxes, as these can damage the finish.
- Dust Protection: Keep the monitors free from dust by regularly cleaning them and, if possible, covering them when not in use for extended periods.
- Ventilation: Ensure that the rear port and any ventilation openings are not obstructed to prevent overheating.
- Handling: Always handle the monitors with care. Avoid dropping them or subjecting them to strong impacts.
- Environmental Conditions: Operate and store the monitors in a dry environment, away from extreme temperatures, direct sunlight, and high humidity.
Troubleshooting
If you encounter issues with your JBL 305P MkII monitors, refer to the following common troubleshooting steps:
- No Sound:
- Check if the monitors are powered on and the power indicator light is illuminated.
- Verify all audio cables are securely connected to both the monitors and your audio source.
- Ensure the volume knob on the monitor and your audio source is turned up.
- Check the input sensitivity switch (+4dBu/-10dBV) to ensure it matches your audio source output level.
- Distorted Sound:
- Lower the volume on both the monitors and your audio source to see if distortion decreases.
- Check for damaged audio cables and replace if necessary.
- Ensure the input signal is not too hot (clipping) from your audio source.
- Hum or Buzz:
- Ensure all equipment is connected to the same electrical outlet or power strip to avoid ground loops.
- Use balanced audio cables (XLR or TRS) if possible, as they are more resistant to interference.
- Move audio cables away from power cables or other sources of electromagnetic interference.
Warranty and Support
The JBL 305P MkII Studio Monitors come with a 5-year warranty, covering defects in materials and workmanship under normal use. For detailed warranty terms, service, or technical support, please visit the official JBL Professional website or contact their customer service department.





