HiFiMAN PRELUDE Manual - Page 3

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IMPORTANT

Tips

1. Always place the headphone ampliﬁer on a dry, stable, and ﬁrm surface.

2. Use the ampliﬁer in a well-ventilated environment that is free of humidity. Prior to use, reduce

volume by turning the volume controller counter-clockwise until it stops.

3. If replacing a fuse, be sure to ﬁrst remove the power cable to avoid risk of electric shock.

IMPORTANT: all fuses must be in accordance with the speciﬁcations. Non-standard fuses,

including shorting rods, will void the warranty. Fuse speciﬁcation: 2A/250V, size: 5*20mm

Special Note

Listening at a high volume for an extended period may damage your hearing.

Precautions

1. The Prelude Headphone Ampliﬁer is a high-current pure Class A design that dissipates heat.

Though it may feel warm to the touch, rest assured it is stable. Do not cover the chassis, and

maintain a minimum of 5cm space above and on the sides at all times.

2. The Prelude headphone ampliﬁer includes multiple Gain options: LOW=0.7V output and

HIGH=1V output. When the high gain is selected, the balanced input signal amplitude should be

less than 3.6V.

3. Headphone and Pre-amp outputs may not be used simultaneously.

4. Do not operate the ampliﬁer for 24 consecutive hours. Doing so will present safety risks and

accelerate the aging of the ampliﬁer.

5. When switching the output channel, be sure to keep the volume at the lowest level. Otherwise,

you may incur damage to the ampliﬁer or headphone.

6. Maintain voltage levels between 210V and 240V. Any lower may lead to failure of the internal

voltage regulator, which will result in unwanted noise. If higher, the temperature of the

voltage regulator may increase to unsafe levels.

Safety Warning

1) Do not expose the ampliﬁer to moisture of any kind. Never place a vase on the ampliﬁer.

2）Always connect the ampliﬁer to a wall outlet or heavy duty adapter intended for high voltage equipment.

3）The power connector and wired network antennas should be grounded at all times.

4） Always power on and off via the power switch, and keep it easy to operate.