PRE 1 - Hi-Fi System OSD Audio - Free user manual and instructions

Product Type	Preamplifier / Hi-Fi System Component
Brand	OSD Audio
Model	PRE 1
Dimensions (H x W x D)	3.5 x 17 x 12 inches
Weight	8 lbs
Power Supply	110-120V AC, 50/60Hz
Power Consumption	15W
Audio Inputs	4 x RCA (line level), 1 x Phono (optional)
Audio Outputs	2 x RCA (main out), 1 x RCA (record out)
Frequency Response	20Hz - 20kHz ±0.5dB
Signal-to-Noise Ratio	>90dB
Total Harmonic Distortion	<0.01%
Chassis Material	Aluminum front panel, steel chassis
Controls	Volume knob, input selector, power switch
Indicators	Power LED (blue/red)
Compatibility	Works with all standard audio sources and amplifiers
Maintenance	Clean with a soft, dry cloth. Do not use liquids.
Safety Precautions	Do not expose to moisture or extreme temperatures. Unplug before cleaning.
Spare Parts & Repairability	Contact OSD Audio customer service for replacement parts and service.
Warranty	2 years limited warranty

Frequently Asked Questions - PRE 1 OSD Audio

How do I connect my turntable to the PRE 1?

If your turntable has a built-in phono preamp, connect it to any line-level input (e.g., AUX, CD). For turntables without a built-in preamp, use the dedicated phono input (if available).

Can I use the PRE 1 with powered speakers?

Yes, connect the main output (RCA) to the input of your powered speakers. Adjust volume using the front knob.

What is the power consumption of the PRE 1?

The unit consumes approximately 15 watts under normal operation.

How do I clean the PRE 1?

Use a soft, dry cloth to wipe the exterior. Do not use any liquids, abrasives, or solvents.

My PRE 1 does not power on. What should I check?

First, ensure the power cable is securely connected and the power switch is on. Check the fuse located near the power inlet; replace if blown. If the issue persists, contact OSD Audio support.

Does the PRE 1 come with a remote control?

No, the PRE 1 is a manual preamplifier and does not include a remote. All controls are on the front panel.

How many inputs does the PRE 1 have?

It has 4 line-level RCA inputs (CD, AUX, etc.) and optionally one phono input. There are also 2 main outputs and 1 record output.

Can I bi-amp my speakers with the PRE 1?

No, the PRE 1 is a preamplifier only and does not provide active crossover or multiple outputs for bi-amping. You would need an electronic crossover and separate amplifiers.

How do I set the volume on the PRE 1?

Rotate the volume knob on the front panel clockwise to increase volume, counter-clockwise to decrease. It is a precise analog control.

Does the PRE 1 have a headphone output?

No, the PRE 1 does not include a headphone jack. It is designed to be used with an external amplifier and speakers.

USER MANUAL PRE 1 OSD Audio

PRE 1

STEREO PRE AMPLIFIER INSTALL GUIDE

Front Panel Description

1. Power ON / OFF
2. Microphone Jack Input
3. Mic Level Control
4. Bass Control: To boost or attenuate low frequency sound.
5. Midrange Control: To boost or attenuate midrange frequency sound.
6. Treble Control: To boost or attenuate high frequency sound.
7. Loudness: To compensate for the non-linear response of the human ear at low volume.
8. Balance: Controls the relative volume between the left/right speakers and headphone.
9. Master Volume: Adjusts the main output volume level of speakers and headphones.
10. Input Selector: Switch between multiple input sources.
11. Tape: Input for an analog tape deck
12. Mono: Switch between mono or stereo signal
13. Low Frequency Filter: Eliminates low frequency distortion from a turntable or warped record.
14. Mute: Reduce the volume level by 20dB. Useful when changing records, tapes or changing sources.

Back Panel Description

1. Phono Inputs: Connect to Left/Right output from a turntable.
2. Aux Input 2: Auxiliary source input.
3. Aux Input 1: Auxiliary source input.
4. CD/DVD Input: Connect to Left/Right output from a CD or DVD player.
5. Tape Play: Connect to a tape decks output jacks.
6. Tape Rec: Connect to a tape decks input jacks.
7. Output: Used to connect to a signal processing unit, such as a graphic equalizer or can be connected to a power amplifier with higher output power.
8. Ground Screw: Connect the ground wire from a turntable here to avoid hum or feedback from the speakers.
9. AC Selector: Switch between 110V-220V AC.
10. Fuse Holder: Contains primary AC fuse If fuse blows replace only with the same amperage fuse.
11. AC Power Cord: Plug the AC cord into a nearby AC outlet or surge protector.

System Diagram

Specifications

Input Sensitivity/Impedance
Mic			0.5V/600	Ohms
Phono			3mV/47k	Ohms
Tape,Tuner,	CD/DVD,	Aux		150mV/47k	Ohms
Output Level/Impedance
Tape	Rec		150mV/100k	Ohms
Pre	Output		500mV/47k	Ohms
Total Harmonic Distortion
Mic			less	than	0.4%
Phono			less	than	0.4%
Tape,Tuner,	CD/DVD,	Aux		less	than	0.2%
Signal to Noise Ratio
Mic			more	than	50dB
Phono			more	than	70dB
Tape,Tuner,	CD/DVD,	Aux		more	than	80dB
Frequency	Response		5Hz - 30kHz +0 -3dB
Tone Control
Bass			±	12dB	@	100Hz
Midrange			±	6dB	@	1kHz
Treble			±	12dB	@	10kHz
Loudness	Control		+4/0/+2dB @ 100/1k/10kHz
Power	Requirements		AC 120V 60Hz / 220V 50Hz
Dimensions			18.9" x 2.36" x 8.25"

Warranty Information

All OSD AUDIO electronics have (2) year Limited Warranty against defects in materials and workmanship. Proof of purchase must accompany all claims. During the warranty period OSD AUDIO will replace any defective part and correct any defect in workmanship without charge for either parts or labor

OSD AUDIO may replace returned electronics with a product of equal value and performance. In such cases, some modifications to the mounting may be necessary and are not OSD AUDIO's responsibility.

For this warranty to apply, the unit must be installed and used according to its written instructions. If necessary, repairs must be performed by OSD AUDIO. The unit must be returned to OSD AUDIO at the owner's expense and with prior written permission. Accidental damage and shipping damage are not considered defects, nor is damaged resulting from abuse or from servicing performed by an agency or person not specifically authorized in writing by OSD Audio

OSD AUDIO sells products only through authorized dealers and distributors to ensure that customers obtain proper support and service. Any OSD AUDIO product purchased from an unauthorized dealer or other source, including retailers, mail order dealers and online sellers will not be honored or serviced under existing OSD AUDIO warranty policy. Any sale of product by an unauthorized source or other manner not authorized by OSD AUDIO shall void the warranty on the applicable product.

Damage to or destruction of components due to application of excessive power voids the warranty on those parts. In these cases, repairs will be made on the basis of the retail value of the parts and labor. To return for repairs, you must email customer service at [e-mail] for a Returned Merchandise Authorization (RMA) number then the unit must be shipped to OSD AUDIO at the owner's expense, along with a note explaining the nature of service required. Be sure to pack the product(s) in a corrugated container with at least 3 inches of resilient material to protect the unit from damage in transit.

This Warranty Does Not Cover: Damage caused by abuse, accident, misuse, negligence, or improper operation (installation) • Any products that have been altered or modified • Any product whose identifying number of decal, serial #, etc. has been altered, defaced or removed • Normal wear and maintenance.