Amp 3 USB - Hi-Fi Auna - Free user manual and instructions

Product Type	Hi-Fi Stereo Amplifier
Power Supply	230 V~, 50 Hz
Output Power (4 Ohm, 1 kHz, 1% THD)	2 x 5 W
Output Power (4 Ohm, 1 kHz, 10% THD)	2 x 6.5 W
Power Consumption	25 W
Total Harmonic Distortion	0.3% (1 kHz)
Frequency Response	20 Hz - 20 kHz
Signal-to-Noise Ratio (AUX)	72 dB
Signal-to-Noise Ratio (MIC)	65 dB
Input Sensitivity (AUX)	230 mV
Input Sensitivity (MIC)	3.2 mV
Bass Control	±10 dB at 100 Hz
Treble Control	±10 dB at 100 Hz
Inputs	3x AUX (RCA), 1x USB 2.0, 1x MIC (1/4")
Outputs	1x Headphone (1/4"), 1x REC (RCA), 2x Speaker (push-type)
Speaker Impedance	4-8 Ohms
Microphone Control	Volume, Pager/Mixing Mode
Balance Control	Yes
Power Indicator	LED
Protection Fuse	1A/250V, 5x20mm (replaceable)
Safety Features	Electric shock prevention, ventilation required
Maintenance	Wipe with damp cloth, replace fuse as needed

Frequently Asked Questions - Amp 3 USB Auna

How do I connect my devices to the Auna Amp 3 USB?

Connect your audio sources (e.g., CD player, smartphone) to the AUX inputs using RCA cables. For a USB device, plug it into the USB port. Select the input source using the AUX1/AUX2/AUX3/USB selector. Connect speakers to the push-type speaker terminals (4-8 Ohm impedance).

How can I use the USB playback function?

Insert a USB drive with MP3 files into the USB 2.0 input. Press the ▶ button to start playback, ◀ to go to previous track, ▶▶ to next track. The LED indicator shows status. Note: the amplifier will resume playback from the last position when powered on again with USB selected.

Why is there no sound from the speakers?

Check all connections: speakers properly connected to terminals, audio source connected and powered. Ensure the master volume is not at minimum. Verify the input selector matches the connected source. Also check speaker impedance (4-8 Ohms). If the amplifier is overheating, it may shut down; let it cool.

How do I adjust the sound quality?

Use the BASS and TREBLE controls to boost or cut low and high frequencies (±10 dB at 100 Hz each). The BALANCE control adjusts left-right balance. The MASTER volume controls overall level (does not affect microphone volume).

Can I use a microphone with this amplifier?

Yes, connect a microphone with a 1/4" plug to the MIC input. Adjust the MIC volume control. The microphone can be used in PAGER mode (music attenuated, microphone overrides) or MIXING mode (microphone and music play together, ideal for karaoke).

What should I do if the amplifier suddenly turns off?

First, ensure it has adequate ventilation and is not overheated. Let it cool down. If it still doesn't turn on, check the fuse (located near the power cord). Replace with a 1A/250V fast-acting 5x20mm fuse. Never use a higher rating.

How do I record audio from the amplifier?

Connect a tape deck or recorder to the REC RCA output. This outputs the current audio signal for recording. Note that the REC output level is fixed and unaffected by the master volume.

What are the power requirements?

The amplifier operates on 230 V~, 50 Hz AC power. Power consumption is 25 W. Use the provided power cord and ensure it's plugged into a suitable outlet.

Is there a headphone output?

Yes, there is a 1/4" headphone jack on the front panel. When headphones are connected, the speaker output may be muted (typical for such amplifiers). Check the manual for details.

How should I clean and maintain the amplifier?

Keep the amplifier dry and in a well-ventilated area. Wipe occasionally with a damp cloth. Do not use harsh chemicals. If the fuse blows, replace it with an identical one. For internal servicing, contact qualified personnel.

USER MANUAL Amp 3 USB Auna

Item number 10032155
Power supply 230 V~ 50 Hz
Output Power, 2 channels driven
4-Ohm, 1 kHz, 1% THD 2 x 5 W
4-Ohm, 1 kHz, 10% THD 2 x 6,5 W
Power Consumption 25 W
Total Harmonic Distortion, 1 kHz 0,3 %
Input Sensitivity, 1 kHz, 4-Ohm Rated Power
AUX1 230 mV
AUX2 230 mV
AUX3 230 mV
MIC 3,2 mV
Frequency Response 20 Hz - 20 kHz
Signal to Noise Ratio 1 kHz, 4-Ohm Rated Power
AUX1 72 dB
AUX2 72 dB
AUX3 72 dB
MIC 65 dB
Tone Controls
Bass ±10 dB, 100 Hz
Treble ±10 dB, 100 Hz

SAFETY INSTRUCTIONS

Explanation of the symbols on the appliance

	CAUTION
	RISK OF ELECTRIC SHOCKDO NOT OPEN
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK; DO NOT REMOVE THE COVER OR BACK. NO USER-SERVICEABLE PARTS INSIDE: REFER SERVICING TO QUALIFIED PERSONNEL.
	The lightning symbol is intended to alert you to the presence of uninsulated, dangerous voltage within this product's enclosure that might be of sufficient magnitude to constitute a risk of electric shock.Do not open the product case.
	The exclamation symbol is intended to inform you that important operating and maintenance instructions are included in the literature accompanying this product.

Care

• Keep the amplifier dry. If it gets wet, wipe immediately.
• Use the amplifier only in well-ventilated installations.
• Handle the amplifier away from dust and dirt.
• Wipe occasionally with a damp cloth to keep it looking new.
• Do not use harsh chemical, solvents or detergents

FEATURES AND CONTROLS

1 Power On/Off and LED Indicator

Main power switch, the indicator lights when the amplifier is turned on.

2 USB 2.0 Input Interface with LED Indicator

Press ◀ to play the last song backward, press ▶ to play the next song forward, and press ▶ to play and/or pause the song. When the song is ceased from playing, it will be memorized to resume once the amplifier is reactivated and/or the USB input is selected again.

3 AUX input

Line Input. AUX/ CD IN -Lets you easily connect the computerized MP3 Device ( player) sources, such as PC( CD ROM), laptop, walkman, iPod, and cell phone.

4 1/4" headphone jack

5 MIC Volume Control

Lets you adjust the volume of connected MIC to the proper setting.

6 BALANCE Control

Lets you adjust the sound balance between the left and right of amplifier outputs.

7 BASS and TREBLE Control

Allows you to boost or attenuate bass and treble for the desired sound.

8 AUX 1/AUX 2/AUX3/ USB Input Selector

Lets you select the desired input music source. When it is switched to AUX1, AUX2, or CD input while the USB is still on playing, the playing signal of USB continues, just it is not sent to the amplifier's output.

9 MASTER Volume Control

Lets you control the overall volume level. It doesn't affect the volume of MIC.

10 Switchable MIC PAGER and MIXING Modes

Set to PAGER, the signal from AUX I/AUX 2/CD will be attenuated BY -12dB and the signal from MIC will override to page (Auto Talkover), it is good for paging system. Set to MIXING, the signals from AUX I/AUX 2/CD and MIG will be existed at the same time, it acts like playing at KARAOKE event.

11 MIC input jack (1/4")

Lets you connect a microphone with a 3,5-mm plug.

12 AUX1/AUX2/AUX RCA inputs

A12) AUX I/AUX 2/AUX RCA Inputs Lets you connect most high level audio sources such as CD player, tape deck, tuner, camcorder, or VCR.

13 REC RCA Output

Lets you connect the amplifier to a tape deck for recording.

14 Push Type Speaker Terminal

Lets you easily connect speaker wires directly to the amplifier. The speaker impedance can be ranged from 4 to 8 Ohms for the general stereo output. The total speaker impedance must be at least 4-Ohmper channel at stereo mode.

15 Replaceable Power Fuse

The amplifier uses a fuse for protection against surges and short circuit. If the amplifier suddenly turns off and will not turn on, check the fuse and if necessary replace it with a lamp, 250-volt, fastacting, 5x20mm fuse (not supplied).

16 AC IN Power Cord

Connect to AC 230 V/ 50 Hz.

MAINTENANCE

Replacing a fuse

This amplifier requires a fuse with the proper rating for protection from power surges and short circuits. If the amplifier suddenly turns off or will not turn on, the fuse is properly blown.

• Let the amplifier cool down and see if it start again before you assume a fuse needs to be replaced.
• Unplug the amplifier from the AC outlet.
• Turn the fuse holder cap and pull out the cap.
• Remove the old fuse and replace it with an identical one.

CAUTION : Never use a fuse with a higher rating.

TROUBLESHOOTING

Problem Possible Reason Solution
No power	The fuse might be blown Check the amplifier's fuse and replace it if necessary.
No sound	Sound source or speakers may not be connected properly.	Check all connections.
	Master volume control may be set to a minimum.	Adjust the volume control to a higher setting.
	The speaker's wire might be the wrong impedance.	Make sure that the speakers that you have connected to the amp are matching in impedance.
	The amplifier is shutting down or powering off.	Turn the amplifier off and let it cool, make sure that the amplifier is properly ventilated, and then turn it back on.
Feedback	Microphone and speakers are to close together.	Reposition the microphone and speakers.

DISPOSAL CONSIDERATIONS

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According to the European waste regulation 2012/19/EU this symbol on the product or on its packaging indicates that this product may not be treated as household waste. Instead it should be taken to the appropriate collection point for the recycling of electrical and electronic equipment. By ensuring this product is disposed of correctly, you will help prevent potential negative consequences for the environment and human health, which could otherwise be caused by inappropriate waste handling of this product. For more detailed information about recycling of this product, please contact your local council or your household waste disposal service.

Declaration of Conformity

Producer: Chal-Tec GmbH, Wallstraße 16, 10179 Berlin. Germany

This product is conform to the following European Directives:

2011/65/EU (RoHS)

2014/30/EU (EMC)

2014/35/EU (LVD)

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