What can I connect to it?

Passive speakers on the wire-clamp terminals, plus sources over Bluetooth, USB, SD card and FM radio. Two microphone inputs are on the front panel.

How much power does it deliver?

It is rated at 50W + 50W across two channels, with 4-16 ohm impedance and a 20-20kHz range. That is enough for typical bookshelf or ceiling speakers in a small room.

Does it work with a phone?

Yes. Bluetooth handles streaming from a phone or tablet, and the USB and SD ports play files directly. There is no app, so control is by the knobs or the remote.

The amplifier, a remote control, an English manual and the color box packaging. Speakers and cables are not included.

Is it good for karaoke?

It has two microphone inputs and tone knobs, so it works for casual singing. It has no echo or vocal effects, so a separate mixer is needed for fuller karaoke control.

How does it compare with a home theater receiver?

It is smaller and simpler, with stereo only and no HDMI or surround decoding. A receiver adds video switching and room correction but costs more and takes far more space.

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Bluetooth Stereo Audio Power Amplifier

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Our take on the Bluetooth Stereo Audio Power Amplifier

The BT-309A-A is a compact 2.0-channel stereo amplifier in a black metal case. It puts out 50W per channel into 4-16 ohm speakers and adds Bluetooth, FM radio, USB and SD playback, plus two microphone inputs and a small remote. Five front knobs handle volume and tone, and a digital display shows the current source. It suits a desk, small room or workshop setup where you want loud, simple sound from passive speakers without a full receiver. Against budget mini-amps it stands out for the mic inputs and radio; it lacks app control and its 220V/12V rating means you should check the mains plug for your region.

Best forSmall room or desk speaker setupsKaraoke and mic use at homeWorkshop or garage soundBudget buyers wanting Bluetooth, USB and FM in one box

Pros

50W per channel drives most 4-16 ohm bookshelf speakers
Bluetooth, USB, SD, FM radio and two mic inputs in one unit
Five knobs for volume and tone give quick hands-on control
Compact metal housing with a digital display
Includes a remote control

Cons

About the Bluetooth Stereo Audio Power Amplifier

This is a Bluetooth stereo power amplifier with a 2.0-channel HiFi design. It is rated at 50W+50W and has an iron housing. Speakers connect through wire clamp terminals.

The front panel has a power switch, five knobs for volume and tone adjustment, and a digital display. It also has two microphone inputs and ports for USB and SD cards. It receives FM and comes with a handheld remote control. It does not support an app.

Model: BT-309A-A
Channels: 2.0 channel, HiFi
Rated power: 50W+50W
Rated voltage: 220V/12V
Rated frequency: 50
Frequency range: 20-20 kHz
Distortion: 0.1
Signal-to-noise: 80
Impedance: 4-16
Material: Iron
Speaker output: Wire clamp
Reception: FM
Front panel: Power switch, 5 knobs, digital display, 2 microphone inputs, USB port, SD card port
App support: Not supported
Dimensions

Questions and answers

What can I connect to it?: Passive speakers on the wire-clamp terminals, plus sources over Bluetooth, USB, SD card and FM radio. Two microphone inputs are on the front panel.
How much power does it deliver?: It is rated at 50W + 50W across two channels, with 4-16 ohm impedance and a 20-20kHz range. That is enough for typical bookshelf or ceiling speakers in a small room.
Does it work with a phone?: Yes. Bluetooth handles streaming from a phone or tablet, and the USB and SD ports play files directly. There is no app, so control is by the knobs or the remote.
What is in the box?: The amplifier, a remote control, an English manual and the color box packaging. Speakers and cables are not included.
Is it good for karaoke?: It has two microphone inputs and tone knobs, so it works for casual singing. It has no echo or vocal effects, so a separate mixer is needed for fuller karaoke control.
How does it compare with a home theater receiver?: It is smaller and simpler, with stereo only and no HDMI or surround decoding. A receiver adds video switching and room correction but costs more and takes far more space.