Fosi Audio GR40 handleiding

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Operation Guide

1. Connect the Bluetooth antenna to the GR40;

2. Insert the 5654W tubes into the GR40, ensuring the pins are aligned,

then attach the tube decorative rings;

3. Choose the appropriate cable (such as USB, optical, or coaxial) to

connect the audio source to the GR40’s audio input interface. Skip this

step if using a Bluetooth audio source;

4. Use RCA cables to connect powered speakers. If using passive

speakers, connect the preamp and power amplifier with RCA cables, then

connect the speakers. If using headphones, connect them to the GR40's

headphone output jack;

5. Power the GR40, press and hold the main knob for 3 seconds to turn on,

then press once to switch to the desired input mode (connect to the

Bluetooth now if using a Bluetooth device as the source), and set the

volume to a low level.;

6. Play music, gradually adjust the volume to a suitable level, and use the

bass and treble controls to fine-tune the sound to your preference.

Important Notes:

1. Since the GR40 is a tube preamplifier, please ensure to allow about 15

seconds for the tubes to warm up before playing audio;

2. The USB port is only for data transfer and cannot be used as a power

connector;

3. Avoid plugging or unplugging cables while the device is powered on to

prevent noise that could damage the product and impact your hearing.

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