1. What type of speakers work best with T3 tube Amplifier?

Fosi Audio T3 works great with any 4-8Ω passive speakers.

Note: please note that the T3 amplifier is for passive speakers, and subwoofer output only supports active speakers.

2. Why Bluetooth connection is intermittent? 

Use another Bluetooth device to have a try.

Ensure that there is no interference from other electronic equipment between the T3 and the audio source.

Put your device close to the T3.

Replug the power adapter.

3. Why the sound is cracking or making a lot of electric noise? 

Use another Bluetooth device to have a try.

Please make sure all the cables are completely pushed into the devices. Incomplete connection will cause this cracking.

Please remove all the inputs then check whether cracking noise disappear or not. The cracking may be from the audio source or input cables.

If you are not using the original factory standard power supply, please replace the power supply before testing. Many power supply adapters in the market have large interference coefficient, which will cause a lot of current sound.

4. Can I use headphone with this product? 

Yes, the T3 as a headphone amplifier will easily drive most headphone to deliver a colossal sound stage and effortless dynamic range.

Note: when headphones are plugged to the headphone jack, the speaker output connections are disengaged.

5. Why there is no voice from my amplifier? 

Please check whether the cable of power supply is connected to T3 and the power switch is on.

Please check that the T3 and your source components are turned on and not set to minimum volume. If possible replace your source and test again.

Check that the wire connections from the audio source to each speaker in the amplifier are connected correctly.

Please check that the cable is not loose or damaged. Incomplete connection is one of the main reasons leading to no sound.

Please make sure the Bluetooth is paired. If Bluetooth is connected, the playback of RCA input will be interrupted. If you want to connect this amplifier with a RCA cable, you need to disconnect the Bluetooth first.

6. My Bluetooth device cannot pair with T3? 

Make sure that T3 is powered on.

Make your device closer to T3 to have a try.

Make sure there are no obstacles between your device and T3. Obstacles will affect the Bluetooth operation distance.

Please try to use another Bluetooth audio source to test.

Please reconnect the power supply to the T3, and move the T3 to another room to have a try.

Restart the T3 and then try to connect again, try to use another Bluetooth device.