OSD Audio PRE-1 High Definition Preamplifier Instruction Manual

1. Introduction

Thank you for choosing the OSD Audio PRE-1 High Definition Preamplifier. This unit is designed to enhance your audio experience by providing versatile source selection and precise audio control. The PRE-1 acts as a central hub for various audio components, including turntables, CD/DVD players, and tape decks, delivering a clean and powerful signal to your main amplifier.

This manual provides detailed instructions for the proper setup, operation, and maintenance of your PRE-1 preamplifier. Please read this manual thoroughly before operating the unit to ensure optimal performance and longevity.

2. Important Safety Information

• Power Source: Connect the unit only to the type of power source indicated on the marking label.
• Ventilation: Ensure adequate ventilation. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
• Water and Moisture: Do not use this apparatus near water or expose it to dripping or splashing.
• Heat: Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
• Cleaning: Clean only with a dry cloth.
• Servicing: Do not attempt to service this product yourself. Refer all servicing to qualified service personnel.
• Grounding: This unit must be properly grounded.

3. Package Contents

Please check that the following items are included in your package:

• OSD Audio PRE-1 High Definition Preamplifier
• Power Cable
• User Manual (this document)

4. Product Overview

4.1. Front Panel

The front panel provides access to all primary controls and a microphone input for convenient use.

This image displays the front panel of the OSD Audio PRE-1 Preamplifier, including its physical dimensions for installation planning.

A detailed view of the left side of the PRE-1's front panel, highlighting the Microphone Level, Bass, Midrange, and Treble adjustment knobs.

A detailed view of the right side of the PRE-1's front panel, showing the Loudness, Balance, and Volume controls, along with input selection and function buttons.

1. Power Button: Turns the unit on or off.
2. Mic Input: 1/4-inch jack for connecting a microphone.
3. Mic Level: Adjusts the volume of the microphone input.
4. Bass Control: Adjusts the low-frequency output.
5. Mid Control: Adjusts the mid-range frequency output.
6. Treble Control: Adjusts the high-frequency output.
7. Loudness: Engages or disengages a loudness contour for enhanced bass and treble at low volumes.
8. Balance: Adjusts the left/right channel balance.
9. Volume: Master volume control for all outputs.
10. Input Select: Rotary knob to choose between Phono, AUX1, AUX2, and CD/DVD inputs.
11. Tape Button: Activates the Tape Monitor loop.
12. Mono Button: Combines stereo signals into a monaural output.
13. Low Filter: Engages a low-frequency cut-off filter.
14. Mute: Silences all audio output.

4.2. Rear Panel

The rear panel houses all the necessary input and output connections for your audio system.

The rear panel of the PRE-1 Preamplifier, showing all input and output connections for various audio devices.

1. Phono Input (L/R): RCA inputs for connecting a turntable. Includes a ground terminal.
2. AUX1 Input (L/R): RCA inputs for general auxiliary devices.
3. AUX2 Input (L/R): RCA inputs for a second auxiliary device.
4. CD/DVD Input (L/R): RCA inputs for CD or DVD players.
5. Tape Play (L/R): RCA inputs for the playback output of a tape deck or other recording device.
6. Tape Rec (L/R): RCA outputs for connecting to the recording input of a tape deck or other recording device.
7. Output (L/R): RCA outputs to connect to your main power amplifier.
8. Ground Terminal (GND): Connects to the ground wire of your turntable to reduce hum.
9. Selector Switch: For internal configuration (typically left in default position unless specified).
10. Fuse: Replace only with the specified fuse type and rating.
11. AC Power Input: Connects to the supplied power cable.

5. Setup and Connections

Follow these steps to properly set up your OSD Audio PRE-1 Preamplifier:

1. Placement: Place the PRE-1 on a stable, flat surface, ensuring adequate ventilation around the unit. Avoid placing it near heat sources or in direct sunlight.
2. Power Off: Ensure all audio components, including the PRE-1 and your main amplifier, are turned off before making any connections.
3. Connect Sources:
   • Turntable: Connect the RCA cables from your turntable to the Phono Input (L/R) on the PRE-1. Connect the turntable's ground wire to the GND terminal on the PRE-1.
   • CD/DVD Player: Connect the RCA cables from your CD/DVD player to the CD/DVD Input (L/R).
   • Other Devices (e.g., Streamer, Tuner): Connect RCA cables from these devices to the AUX1 Input (L/R) or AUX2 Input (L/R).
   • Tape Deck: Connect the playback outputs of your tape deck to the Tape Play (L/R) inputs. Connect the recording inputs of your tape deck to the Tape Rec (L/R) outputs.
4. Connect to Amplifier: Connect the Output (L/R) RCA jacks on the PRE-1 to the input jacks of your main power amplifier.
5. Power Connection: Connect the supplied power cable to the AC Power Input on the rear panel of the PRE-1, then plug it into a suitable wall outlet.
6. Initial Power On: Turn on your main power amplifier first, then turn on the PRE-1. When powering off, turn off the PRE-1 first, then your main amplifier.

6. Operating Instructions

Once your PRE-1 is connected, follow these steps for basic operation:

1. Select Input: Use the Input Select rotary knob on the front panel to choose the desired audio source (Phono, AUX1, AUX2, CD/DVD).
2. Adjust Volume: Start with the Volume knob at its minimum setting. Begin playing your selected audio source and slowly increase the volume to a comfortable listening level.
3. Tone Controls: Use the Bass, Mid, and Treble knobs to adjust the tonal characteristics of your audio. Turn clockwise to increase, counter-clockwise to decrease.
4. Balance Control: Adjust the Balance knob to fine-tune the left and right channel output for optimal stereo imaging.
5. Loudness: Press the Loudness button to activate a contour that boosts bass and treble frequencies, which can be beneficial at lower listening volumes. Press again to deactivate.
6. Low Filter: Press the Low Filter button to engage a filter that reduces very low frequencies. This can help eliminate rumble from turntables or other unwanted low-frequency noise. Press again to deactivate.
7. Mono: Press the Mono button to combine the left and right stereo channels into a single monaural signal. This is useful for playing mono recordings. Press again for stereo.
8. Mute: Press the Mute button to instantly silence the audio output. Press again to restore sound.
9. Microphone Use: Plug a microphone into the Mic Input. Adjust the microphone's volume using the Mic Level knob.
10. Tape Monitoring/Recording: If you have a tape deck connected, select the appropriate input for playback. To record, ensure your tape deck is set to record and the PRE-1 is passing the desired source through the Tape Rec outputs.

7. Maintenance

Proper care and maintenance will ensure the longevity and optimal performance of your PRE-1 Preamplifier.

• Cleaning: Use a soft, dry cloth to clean the exterior of the unit. Do not use liquid cleaners, aerosols, or harsh chemicals, as they may damage the finish or internal components.
• Ventilation: Periodically check that the ventilation openings are free from dust and obstructions.
• Connections: Occasionally check all cable connections to ensure they are secure. Loose connections can lead to signal loss or interference.
• Storage: If storing the unit for an extended period, disconnect it from the power outlet and store it in a cool, dry place, away from direct sunlight and extreme temperatures.

8. Troubleshooting

If you experience issues with your OSD Audio PRE-1, refer to the following common problems and solutions:

9. Specifications

Below are the technical specifications for the OSD Audio PRE-1 Preamplifier:

10. Warranty and Support

OSD Audio products are designed for reliability and performance. For specific warranty details and terms, please refer to the warranty card included with your product or visit the official OSD Audio website. If you require technical assistance or have questions not covered in this manual, please contact OSD Audio customer support.

OSD Audio Customer Support: Please visit the OSD Audio website for contact information and support resources.