PreSonus Quantum ES 2 USB-C Audio Interface User Manual

1. Introduction

The PreSonus Quantum ES 2 is a high-performance 2x2 USB-C audio interface designed for musicians and audio creators. It features two MAX-HD mic preamps, instrument inputs co-developed with Fender, and comes with a perpetual license for Studio One Pro software. This manual provides essential information for setting up, operating, and maintaining your Quantum ES 2 interface.

Image 1.1: The PreSonus Quantum ES 2 audio interface shown alongside its bundled Studio One Pro software box. This image illustrates the complete product package.

2. Setup

2.1 Unboxing and Package Contents

Before proceeding, ensure all components are present in the package:

• PreSonus Quantum ES 2 USB-C Audio Interface
• USB-C to USB-C Cable
• Power Supply (if not bus-powered, check specific model)
• Quick Start Guide
• Product Registration Card (for Studio One Pro license)

2.2 Hardware Connections

Follow these steps to connect your Quantum ES 2:

1. Connect to Computer: Use the provided USB-C cable to connect the Quantum ES 2 to an available USB-C port on your computer. The device is bus-powered, but an optional Aux Power Port is available for older computer models that may require additional power.
2. Connect Microphones/Instruments:
   • For microphones, use XLR cables to connect to the Mic/Line In combo jacks on the rear panel.
   • For guitars or basses, use 1/4-inch TS cables to connect to the Guitar/Bass Inputs on the front panel.
3. Connect Monitors: Connect your studio monitors to the Main Outs (balanced 1/4-inch TRS) on the rear panel using appropriate cables.
4. Connect Headphones: Plug your headphones into the Stereo Headphone Out on the front panel.

Image 2.1: Front panel overview of the Quantum ES 2, highlighting 48V Phantom Power, Auto Gain, Multi-Function LED Encoder, Guitar/Bass Inputs, Responsive LED Metering, and Stereo Headphone Outs.

Image 2.2: Rear panel overview of the Quantum ES 2, showing MIDI Connectivity, All-New MAX-HD Mic Preamps, Optional Aux Power Port, Bus-Powered USB-C port, and Main Outs.

2.3 Software Installation

To fully utilize your Quantum ES 2, you will need to install the necessary software:

1. Register Your Product: Visit the PreSonus website and register your Quantum ES 2 using the provided product key. This will grant you access to your Studio One Pro license and other software downloads.
2. Install Universal Control: Download and install the latest version of PreSonus Universal Control for your operating system (Windows or macOS). This application provides full control and metering for your interface.
3. Install Studio One Pro: Download and install Studio One Pro from your PreSonus account. Follow the on-screen instructions for activation.
4. Driver Installation: Universal Control will install the custom low-latency drivers required for optimal performance of your Quantum ES 2.

3. Operating Instructions

3.1 Basic Operation

• Power On/Off: The Quantum ES 2 powers on automatically when connected via USB-C to your computer. To power off, disconnect the USB-C cable or use the power button on the rear panel if applicable.
• Multi-Function LED Encoder: This large knob controls various parameters. Press it to cycle through functions like input gain and output volume. Rotate to adjust the selected parameter.
• Input/Output Metering: The bright LED meters provide visual feedback for your input and output levels. Aim for levels that are strong but do not consistently peak into the red.

3.2 Input and Gain Control

• MAX-HD Mic Preamps: The two mic preamps offer +75 dB of gain. Adjust gain using the Multi-Function LED Encoder or via the Universal Control app/Studio One.
• 48V Phantom Power: Press the 48V button on the front panel to enable phantom power for condenser microphones. Ensure phantom power is only used with microphones that require it.
• Auto Gain: Press the Auto button to automatically set optimal gain levels for your connected microphones or instruments. This feature helps achieve recording-ready levels quickly.
• Instrument Inputs: The front-facing instrument inputs are optimized for guitars and basses. Ensure the correct input is selected for your instrument.

3.3 Monitoring and Outputs

• Main Outputs: Control the volume of your main studio monitors using the Multi-Function LED Encoder when the main output is selected.
• Headphone Output: Adjust headphone volume independently.
• Software Monitoring: The Quantum ES 2 relies on software monitoring through your Digital Audio Workstation (DAW). To hear your live input, you must enable input monitoring within your DAW (e.g., "Input Echo" in Cakewalk, or similar features in Studio One, Reaper, Pro Tools). This routes the input signal through the DAW to your outputs.
• Loopback Audio: This feature allows you to route audio from your computer's playback directly back into the interface for recording or streaming, simplifying the creation of monitor and streaming mixes.

3.4 Universal Control App Integration

The Universal Control app provides comprehensive control over your Quantum ES 2 settings from your computer or mobile device. This includes preamp gain, phantom power, and other critical functions, allowing for precise adjustments without interrupting your recording session.

4. Maintenance

• Cleaning: Use a soft, dry cloth to clean the exterior of the unit. Avoid abrasive cleaners or solvents.
• Storage: Store the Quantum ES 2 in a cool, dry place away from direct sunlight and extreme temperatures when not in use.
• Firmware Updates: Periodically check the PreSonus website for firmware updates for your Quantum ES 2. Updates can improve performance and add new features.

5. Troubleshooting

5.1 No Power/Device Not Recognized

• Ensure the USB-C cable is securely connected to both the Quantum ES 2 and your computer.
• If using an older computer or experiencing power issues, connect an external power supply to the optional Aux Power Port.
• Verify that the correct drivers are installed via PreSonus Universal Control.
• Try a different USB-C port or cable.

5.2 No Audio Input/Output

• Check all cable connections (microphones, instruments, monitors, headphones).
• Verify input gain levels on the Quantum ES 2 and within your DAW.
• Ensure phantom power (48V) is enabled for condenser microphones if required.
• Confirm that the Quantum ES 2 is selected as the audio input/output device in your computer's sound settings and your DAW.
• For live input monitoring, ensure input monitoring is enabled within your DAW.
• Check the LED meters on the Quantum ES 2 to see if an input signal is present.

5.3 Latency Issues

• Adjust the buffer size in your DAW's audio settings. Lower buffer sizes reduce latency but require more CPU power.
• Ensure you are using the latest PreSonus drivers.
• Close unnecessary applications running in the background.
• For Windows users, optimizing your system for audio (e.g., disabling HPET, adjusting power modes) can help. Refer to PreSonus support resources for detailed optimization guides.

6. Specifications

7. Warranty and Support

PreSonus products typically come with a limited warranty. For detailed warranty information, please refer to the warranty card included with your product or visit the official PreSonus website.

For technical support, driver downloads, firmware updates, and additional resources, please visit the PreSonus support page: www.presonus.com/support.