AMP-120SD - Receiver Steren - Free user manual and instructions

Product Type	Stereo Receiver / Amplifier
Brand	Steren
Model	AMP-120SD
Output Power	25W per channel (RMS) into 8 ohms
Total Harmonic Distortion	< 0.1%
Frequency Response	20 Hz - 20 kHz ±1 dB
Input Sensitivity	200 mV for full output
Input Impedance	47 kΩ
Speaker Impedance	4 - 16 ohms
Audio Inputs	3x RCA (AUX, CD, Tuner), 1x 3.5mm jack
Audio Outputs	2x Speaker terminals, 1x Headphone (3.5mm)
Power Supply	AC 120V/60Hz, 40W
Dimensions (W x H x D)	215 x 65 x 200 mm
Weight	1.2 kg
Chassis Material	Aluminum front panel, steel case
Cooling	Passive (heat sink)
Included Accessories	Power cord, remote control (optional)
Maintenance	Clean with a soft dry cloth; do not use solvents
Safety	Unplug before cleaning; avoid moisture; do not place near heat sources
Spare Parts Availability	Contact Steren authorized service centers for replacement parts
Repairability	Designed for professional repair; no user-serviceable parts inside

Frequently Asked Questions - AMP-120SD Steren

What is the power output of the Steren AMP-120SD?

The AMP-120SD delivers 25W per channel RMS into 8-ohm speakers, suitable for small to medium rooms.

How do I connect speakers to the AMP-120SD?

Use the speaker terminals on the rear panel. Ensure impedance is between 4 and 16 ohms. Strip the wire ends and insert into the binding posts, then tighten.

Can I connect a subwoofer to this receiver?

The AMP-120SD does not have a dedicated subwoofer output. You may use a passive subwoofer with a crossover connected to the speaker outputs, or an active subwoofer via the AUX or CD inputs.

What audio sources can I connect?

You can connect devices via RCA inputs (AUX, CD, Tuner) or a 3.5mm jack. Common sources include CD players, turntables (with preamp), smartphones, and TV audio outputs.

How do I clean and maintain the AMP-120SD?

Unplug the unit, then wipe the exterior with a soft, dry cloth. Do not use liquids or abrasive cleaners. Keep ventilation slots free of dust.

Is the AMP-120SD compatible with 240V mains?

The standard model is designed for AC 120V/60Hz. Using it on 240V without a step-down transformer may damage the unit. Check the label on your device.

Why is there no sound from the speakers?

Ensure the speaker wires are properly connected, the source device is playing, the volume is turned up, and the correct input is selected. Also check if the mute function is activated.

Can I use headphones with this receiver?

Yes, plug headphones into the 3.5mm headphone jack on the front panel. When headphones are connected, speakers are automatically muted.

Does the AMP-120SD have a remote control?

Some versions may include an infrared remote. Check the box contents. If yours did not come with one, you can purchase a universal remote compatible with Steren amplifiers.

Where can I find the user manual in other languages?

On the notice-facile.com page for this device, you can request a translated manual by selecting your language and providing your email. The PDF manual is also available for download.

USER MANUAL AMP-120SD Steren

Line drawing of a U-shaped electrical plug with two connectors (no text or symbols)

INSTRUCCIONES

ESPECIFICACIONES

STEREN PRODUCTO EMPACADO S.A. DE C.V.

Autopista México-Querétaro. Km 26.5 Sin número, Nave Industrial 3-A, Col. Lomas de Boulevares, Tlalnepantla de Baz, Estado de México, C.P. 54020, RFC; SPE-941215-H43

IMPORTANT

Please read this instruction carefully to know how to properly use the product.

The information is presented only as a reference; Due to updates there may be differences. Check our website www.steren.com for the latest version of this manual.

CAUTIONS

• This device is not intended for use by people (including children) whose physical abilities, sensory or mental are different or are reduced, or lack experience or knowledge.
• Children should be supervised to make sure they do not use the device as a toy.
• Do not expose the equipment to extreme temperatures.
• Do not use or store this equipment in places where there are leaks or splashes of water.
  • Always use a soft, dry cloth to clean the equipment.
• Do not try to open the equipment; may cause malfunction and will void the warranty.
• Do not use solvents to clean it.
• Place the equipment in a place with sufficient ventilation.
• Do not place it near objects that may block the ventilation slots.
• Before changing the fuse, disconnect the power cord, to avoid electric shock.
• Before turning on the equipment, make sure that the volume controls are at the minimum level.
• Connect the equipment only to a grounded contact.
• To disconnect the equipment, pull the plug carefully and remove it from the contact. Never pull the cable power to disconnect it.
• Do not use the connected equipment with both types of power (in a battery or directly in the current electrical), at the same time.

Operation of this equipment is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference, including interference that may cause it.

CONTENT AND DESCRIPTION

AMPLIFIER

Rear panel

1. Siren or alarm switch
2. Power LED indicator
3. General switch
4. 6.3 mm input for microphone 1
5. Gain control for microphone 1
6. 6.3 mm input for microphone 2
7. Gain control for microphone 2
8. 6.3 mm auxiliary input
9. Gain control for auxiliary
10. Slot for SD memory
11. Slot for USB memory (Only in AMP-120SD)
12. Play / Pause
13. Change of mode
14. No function
15. Display
16. IR sensor
17. Physical volume control of the player
18. Equalizer / Repeat Track
19. On / Off switch for the MP3 player
20. Next track / Increase virtual volume

21. Previous track / Decrease virtual volume

22. Stop track

23. COM, 4, 8 and 16 Ω impedance outputs
24. Line outputs 70 and 100 V
25. Terminals for 12 V battery --- 10 A
26. GND connection
27. Fuse compartment
28. Input for interlock cable

REMOTE CONTROL INTERLOCK CABLE

Line drawing of a U-shaped electrical plug with two terminal connectors (no text or symbols)

INSTRUCTIONS

Before starting, make sure that the main switch is off (in position ), and that the gain knobs are at the minimum level.

1 Connect the power cables to a 12 V --- 12 A * battery (option A) or to an electrical outlet (option B).

2 Connect audio cables * to the speaker or passive speakers *, in any of the configurations shown in the following examples, and then connect them to the output terminals by impedance of the amplifier.

Examples

1 speaker

2 serial speakers

2 parallel speakers

4 series / parallel speakers

In the amplifier, you must use the COM terminal (common) and the one corresponding to the impedance of your array.

* Sold separately

3 Connect the microphones and the audio player to the 6.3 mm input terminals.

To connect an AUX player, a 6.3mm plug to 3.5mm jack adapter and a 3.5mm AUX cable are required. (sold separately).

4 Place the main switch in the on position (I). Adjust the gain of each entry with the corresponding knobs.

Using the MP3 player and Bluetooth connection (only AMP-120SD)

1 Once the main switch is turned on, the player will turn on automatically; If this does not happen, press the power button on the player.

2 Insert an SD or USB memory (sold separately) with music in MP3 format. The reproduction will start immediately.

graph TD
    A["SD"] -->|MMC CARD| B["USB"]
    B -->|USB| A

The USB port is only available for the AMP-120SD model

3 To switch to Bluetooth mode, press the MODE button several times, until the legend appears on the screen bLUE (AMP-120SD only).

4 On your smartphone, look for the Steren AMP-120 device, and select it to pair it.

5 Switch between both playback modes (memory or Bluetooth) by pressing the MODE button.
6 Use the buttons ▶, ◀◀, ▶▶ or ■ to control playback.
7 Press the EQ button continuously to change the equalization or hold it down to activate the repeat track function.
8 Adjust the volume with the physical knob or press and hold the buttons ◀◀ o ▶▶ to increase or decrease the virtual volume.

SPECIFICATIONS

Input: 125 V\~ 50/60 Hz 120W

12 V --- 10A

Frequency response: 50 – 15 000 Hz

Impedance: 4, 8 and 16 Ω

Line output: 70 / 100 V

Power output: 70 Wrms / 120 W max.

Remote control

Input: 3 V --- (1 x CR2025)

The specifications may change without prior notice.

WARRANTY POLICY

STEREN

Product: Audio Amplifier

Model: AMP-120 / AMP-120SD

Brand: Steren

This Steren product is warranted under normal usage against defects in workmanship and materials to the original purchaser for one year from the date of purchase.

CONDITIONS

1. This warranty card with all the required information, invoice or purchase ticket, product box or package, and product, must be presented when warranty service is required.
2. If the product is in the warranty time, the company will repair it free of charge. The supplier will pay for transportation charges.
3. The repairing time will not exceed 30 natural days, from the day the claim was received.
4. Steren sell parts, components, consumables and accessories to customer, as well as warranty service, at any of the addresses mentioned later.

THIS WARRANTY IS VOID IN THE NEXT CASES:

If the product has been damaged by an accident, acts of God, mishandling, leaky batteries, failure to follow enclosed instructions, improper repair by unauthorized personnel, improper safe keeping, among others.

a) The consumer can also claim the warranty service in the purchase establishment.

b) If you lose the warranty card, we can reissue it, if you show the invoice or purchase ticket.

RETAILER INFORMATION

Name of the retailer

Address

Serial number

Product

ELECTRÓNICA STEREN S.A. DE C.V.

Biólogo Maximino Martínez No. 3408, San Salvador Xochimanca, Del. Azcapotzalco Ciudad de México 02870, RFC: EST850628-K51

STEREN PRODUCTO EMPACADO S.A. DE C.V.

Autopista México-Querétaro. Km 26.5 Sin número, Nave Industrial 3-A, Col. Lomas de Boulevares, Tlalnepantla de Baz, Estado de México, C.P. 54020, RFC: SPE-941215-H43

In case your product fails or have questions, please contact your nearest dealer.

If you are in Mexico, please call to our

Call Center.

01 800 500 9000