The SMSL AD18 comes back to us in V3 version with this time an integrated Subwoofer output, and the possibility to adjust the brightness of the screen (DIMMER). The Subwoofer output is accessible via the 3.5mm jack port at the base for Coaxial / Optical input. As shown in the diagram below:

Despite the fact that it is the same connector, you can use the Coax / OPTI1 input and the Subwoofer output simultaneously with a jack to RCA cable (mixed or female) like this one:

You can use this adapter to use coaxial and subwoofer : 3.5mm stereo male to 2x RCA female jack adapter cable 15cm
This adapter is also compatible: 3.5mm stereo male to RCA female stereo jack adapter

You can also use this adapter if you need only coaxial intput :
Jack to RCA adapter Coaxial AD18

SMSL AD18 is part of the new generation of FDA Full Digital Amplifier. It uses the high technology TAS5508C and TAS5342 chips using Texas Instrument's Digital Pure Path process. With a compact design it will bring a high resolution for the music lover who wants to combine compactness and high audio quality.

This amplifier has the characteristic of being a "Full Digital" i. e. that the S/PDIF or USB signal is converted to I2s and then directly amplified by the torque TAS5508C and TAS5342. The path of the digital signal thus simplified allows an astonishing quality of restitution of this category of apparatus.

The Bluetooth BT4.2 NFC Bluetooth format input allows you to take advantage of the qualities of the SMSL AD18 by offering better quality wireless playback for compatible iPad, iPhone, iOS, tablets and Android smartphones. (maximum distances 10m in close surroundings without obstacles).

This all-in-one amplifier is also equipped with a digital equalizer with many functions (bass tuning, treble, etc.).

It will be the ideal companion for any digital wireless or cordless source. Its ergonomics and compactness are not inconsiderable assets, to which is added its versatility thanks to its 1.44 colour TFT display, which precisely indicates each function.

To connect a coaxial cable to the AD18's Coaxial input in 3.5mm Jack format, you can use this compatible adapter: 3.5mm male mono to female RCA jack adapter.