 Class DM's based on Hypex modules are found all over the place en given the price of the modules some expect cheap deals. And those are around. This is of a different class. A different D-class. Let's start with how to use this Power Amp. Of course it needs to be connected to a pair of matching speakers and a source. That source can be the matching CIOudio DMC1 network player. Je dan only need to connect that to the Power Amp over RCA cables en to the network using either Ethernet cable or Wi-Fi. A network player is controlled from a tablet, smartphone or computer. But you can also set up a classic stereo by adding a preamplifier for input selection and volume control. Then you can add a number of sources to the preamplifier like a CD player or network player. A latter will need a network connection. De housing is made of thick aluminium en is well-crafted. Het measures 215 x 230 x 73 mm en weighs 2.7 kg. De front only holds a power button with integrated blue power light as ring around the button. De rear holds the IC mains input with integrated fuse holder. Dan per channel een input aan RCA, een gain setting dat is normaal set at 26 db's maar voor je met passive control amps, het moet be set tot 32 db's. Remainst de 5 way loudspeaker banding posts. Als we open de top, zien we een groot black cage holding the switch mode power supply. Laten we het nog eens zeggen, switch mode power supplies are not necessarily a bad thing. If it's well-designed and built, it can be equal to a well-designed and built linear power supply. The cage around it holds away any stray magnetic field from the audio parts. Then we see two Hypex Class D OEM modules, which are only partly used. CI developed their own input circuit for as far as I can see by discrete components. Also the power supply section is skipped. We see this more often and it always leads to very good results, at least in my experience. There is really nothing to say about using the C100S. Just connect the source, like a preamp, DAC or network player to the inputs and speakers to the outputs. You do need a source that has a volume control, of course. If that has a passive volume control, as with the CI Audio Control Center, you have to set the gain at the back of the amp at 32 dB gain. Do this when the amp is switched off. Class D amps need not stay on all the time. After the burning time, they sound well almost immediately when switched on. Class D amps can have a nasal character and sound somewhat aggressive in the top end, but they always sound firm, powerful in the lows. Still, that combination does not even produce a fine open bass sound. The C100S proves that it can be done differently too. And then the low end is not powerful in a cheap way, but rather deep, fully controlled with a fine texture. The mid-range is upfront without being aggressive and the highs are what you expect of a power amp in this price range. This is a fine sounding amp that is not afraid of difficult loads either. Quality wise is it to be placed in between my setup 2 and setup 1. I have reviewed this amp since it is such a nice combination with the CI Audio DMC One Network Player. Together they function very well while being compact and only controllable over a smartphone, tablet or computer. Just add two quality speakers and you have a very musical setup. But if you need a good power amp for your current stereo en it fits your demands, it's a good choice for that too. Class D amps typically are over 90% efficient, meaning they produce very little heat and consume clearly less power than a Class AB amp. So it's green too. Which concludes this show. There will be a new show every Friday at 5 p.m. Central European Time. If you don't want to miss that, subscribe to this channel or follow me on the social media, so you will be informed when new videos are out. If you like this video, give it a thumbs up. Many thanks to those viewers that support this channel financially. It keeps me independent and thus trustworthy. If that makes you feel like supporting my work too, the links are in the comments below this video on YouTube. I am Hans Beekhuyzen, thank you for watching and see you in the next show or on theHBproject.com. En whatever you do, enjoy the music.