Connect the rear power amplifier that needs external connection to the audio source output interface. Disclaimer: I must start by saying I don't really consider myself a true audiophile and I'm not fully familiar yet with the audiophile lingo, so please bare with me. BTW, I have Aiyima A07 pro running with Elac Debut 6 Floorstands, haven't had any issues with it which made me think for another Aiyima product.

The USB of DAC A6 supports DSD512 decoding and PCM decoding from 16bit/44.1 kHz to IJ 32bit/768kHz, which is enough to cover the current mainstream formats and be compatible with higher format formats that may appear in the future. Other than that I think having a DAC and optical input is great (obviously at this price its a cheap DAC) - though I couldn't hear anything obviously bad. I had a few devices plugged in (and Volumio Mini PC via USB) and Airport Express (via Optical) and a Turntable via RCA and it was great to be able to switch with the provided remote control. The M2 seems to be very flat and a bit "upfront". The T9 Pro seems more like a U-shaped signature. Perhaps with some added "reverb"? (it feels like I'm listening in a larger room with a slightly better instrument separation and not so upfront).For TV optical out connection, it worked when optical out was set to auto. With my other/previous DACs, I always had to set it to PCM. Just like A07, speaker connectors are small but I had no issues in connecting 4 mm banana plugs. I am using 12 AWG cables, might be difficult to put in bare wires! In For One to Love, Cecile McClorin .Salvant sings an absolutely ravishing Le Mal de Vivre (original Barbara). She gives a completely new dimension to the song. The subtle use of inflections in her perfect French tests microdynamics. In general I like the sound of the T9 Pro more, although on tunes with a fair bit of "reverb" already in the original recording, it might feel a bit too much on the Aiyima and I'd prefer the Motu's flatter response.

Overall, I liked the features, lots of connections, sounds really good to me. I ran it mostly with 55 - 60% volume and it sounded clear, lots of details, base, etc. etc. A: Since power consumption is considered in the design of this machine, Bluetooth does not work when other channels are used. You must switch to Bluetooth input mode to search for pairing. I am encountering issues when I hook two different examples of a T9 pro up to a Sony CDP-CX355 carousel CD player via the Optical connector.HiFi clear sound with tone control: resonable circuit and concise wiring, adopts vacuum tubes to soften the sound and filter out the digital feelings, sounds warm and sweet without noise. Also with treble and bass knobs to adjust one's own preferable sound styles, presents HiFi music with rousing highs and deep lows. A: When the unshielded signal line is unloaded, the interference signal will enter the power amplifier for amplification. It is recommended to replace it with shielded signal wire or unplug the signal wire.