TV -> speakers aux, coaxial optical

[silk186]

My TV is being replaced for another week and it doesn't have the optical audio jack which I used with my other TV. Currently, my Edifier A300 are connected to the TV by BT but the volume is very low.

My speakers support several inputs with different sensitivities:

• AUX:700±50mV
• Balance:1150±50mV
• USB:550±50mFFs
• Optical:500±50mFFs
• Coaxial:500±50mFFs

The TV supports supports AUX and Coaxial.
I've done some research but I'm not getting a clear answer on which if any is better.

optical - lower quality (but probably not lower than the TV output) and no risk of interference
coaxial - higher quality and more durable (digital)
aux - analog so quality depends on tv DAC?

Which one should I use?

 

[staticV3]

Optical.

If there's no optical output, then Coaxial.

 

[silk186]

I find some more info about the speakers:

• The SPDIF receiver is PCM9211 also from Texas Instrument, which supports up to 216 KHz input sample rate. With a very low output jitter, the unpacked audio signal can be delivered to XMOS processor with zero loss.
• The USB audio interface supports UAC2 audio application. A300’s USB interface supports an input sample rate up to 192 KHz. This audio application effectively avoids signal degradation and dynamic range loss due to the PC audio DAC, and provides a new way of high-definition audio playback.
• The Bluetooth audio receiver is built on Qualcomm’s Bluetooth V5.0 chipset, which supports APT-X decoder, and offers a far better audio playback quality than traditional Bluetooth which runs on SBC.

It seems that the TV does support USB as well. What would be better optical or USB?

 

[staticV3]

What would be better optical or USB?

If there's no additional noise due to the electrical connection via USB, then USB.