 Two years ago I reviewed the SOtM SMS 200 network bridge and was very enthusiastic. A year later I reviewed the SMS 200 Ultra and was even more enthusiastic. A month after that I reviewed the Neo version of it and this time the sound quality was improved slightly further. Then SOtM asked me to review this version driven by an external clock unit costing $3,500. I was rather curious but had limited myself to devices up to €2,000. Nevertheless, after a year curiosity got a better of me and perhaps that was a mistake, a big mistake. The SCLK OCX10 comes in the same housing as the SMS 200 Ultra and the matching power supply, the SPS 500. Since the SCLK OCX10 is an optional clock generator for the SMS 200 Ultra and the Ultra Neo, I suggest you also watch the reviews of these devices. Technically there is a small difference between the SMS 200 Ultra and the SMS 200 Ultra Neo, functionally they are equal. Another thing, I will refer to the SCLK OCX10 as clock generator to prevent tongue injury. For the same reason I will use network bridge for the SMS 200 Ultra. When I say network bridge I mean both the normal and the Neo version. In both cases you do need to select the master clock option on ordering. This will add a B&C connector to the rear of the unit to connect the clock generator tool. When ordering it is also clever to go for the 12 volt version so you can use one power supply to power both units over a wire cable. The clock generator is only available in 12 volts DC version. The network bridge is connected to the router over a network cable. This way it is connected to the internet and other devices in the network like a computer and a NAS. The USB output of the network bridge is connected over a USB cable to the DAC in your stereo setup. Unless you have an amplifier with integrated DAC in which case it can be connected directly to the amp provided it has a USB 2 audio class 2 input. Almost all equipment with USB inputs younger than 5 years will fulfill this requirement. As drawn here this is the normal way to listen to the network bridge. You only need player software on the computer that can drive the network bridge. One that I use does that but any DNA server program can be used too and even Logitech Media server LMS for short is supported so the network bridge can be used as a high quality squeeze box. The network bridge can also function as a music server. It has a music player demon, LMS and Minim server aboard, meaning that you can use the network bridge as streamer by itself. Time to connect the clock generator. That's just a matter of connecting a 50 ohm BNC cable between the clock generator and the network bridge. As soon as the network bridge receives the 10 GHz clock signal it will lock on that. The network bridge and the clock generator use identical housings as does the matching power supply. They all measure 106 x 245 x 48 mm. The network bridge and the clock generator weigh 1.5 kg, the power supply 2 kg. They all have this green power indicator that doubles as a standby switch on the network bridge and the power supply but not on the clock generator. And rightly so, clock generators can best be left switched on. As said to use the clock generator you do need a special version of the network bridge. This is the standard version which has no connector to link the clock generator to. The special version does have this BNC connector and costs €200 more. Since we are here, let's see what the other connectors do. On the right the network socket, then a reset button, two USB connectors for storage media if you use it as a server, the power input, the specially optimized USB audio output and the microSD card that holds the operating system. Looking at the rear of the clock generator we see the power input and four BNC connectors that all output the 10 GHz clock signal. You just connect one of these BNCs over a 50 ohm BNC cable to the clock input of the network bridge. From a technical perspective the SOTM approach differs from how clock signals usually are done. They use a sine wave signal instead of a square wave. According to SOTM a lower noise clock signal can be achieved this way, something I can imagine since a sine wave is a pure one while a square wave is a sine wave with theoretically an unlimited number of harmonics. Anyway, due to this approach other clock generators should not be used with the SOTM network bridge. You have asked many times for a description of my setups. Well, here roughly my setup one. The network bridge is connected to the SOTM network switch. This is connected over glass fiber to a six hole switch, to that the NUC with runed rock and the NASA connected over CAT 6 patch cables. My router is connected to the SOTM switch to provide internet access. The clock generator is connected to the network bridge, both are powered by the SOTM power supply over a Y cable. The USB audio output of the network bridge is connected to the USB input of the mini DSP SHD that I use for room correction. The connection to the MiTech Brooklyn is over speedive and the analog outputs are sent to the Audio Note Soro SE that is heavily tweaked by Peter van Willen's fight of audio magic. The speakers are AudioPhysics Scorpios, cables are by AudioQuest, CrystalCable and SOTM. Now here is where I encounter my first problem. How the flag can I explain to you my listening experience with this clock generator? I have been tripping and flipping in my review of the network bridge without a clock generator. Adding the clock generator gave me another euphoria. The sound is even less stressed. The stereo image is now so deep and wide that I am glad my neighbours are on holiday, for often instruments are halfway there living. The lows are extremely controlled and textured while the highs are refined to the extreme. Even more impressive are transients that are so well timed, fast and real. They are probably the reason for the focusing of the instruments within that big stereo. While listening I suddenly missed the magic the clock generator brought while I had not switched it off. It appeared that the wire cable for powering had a loose contact. It was a sunny day and then the green power indicator is just light or by the sunlight so I could not have seen the defect, only here. This way the sound improvement was 100% certified by this experience, at last to me. Just to see the influence of the SOTM DCBL BNC cable that was sent with the clock generator, I replaced it with an off the shelf 50 ohm BNC cable, whether they gave an immediate degradation of the sound quality. The SOTM cable sets you back 700 Euros but finding a cheaper alternative won't be easy since there are not much 50 ohm BNC cables around that do 10 GHz. And the SOTM cable does provide very very good results. I'm still worried I haven't made clear to you how big the sound improvement is adding the clock generator. Well, I did the best I could. If you are interested in sound quality you must hear the total front end reviewed here. Unless you lack the funds to buy it on the spot, for you will be spoiled forever. Your old setup will no longer do. And that's my second problem. But this is not about me, it's all about the fantastic 3P's front end. At slightly over 6000 Euros including VAT, the European sales tax, it's a lot of money. And to be honest, the only comparison I have is the Meridian 803.3 DAC Preamp. I already preferred my front end without the clock generator. Perhaps I might review comparable systems in the future. I have said it before and I say it again, development in digital audio happens at a very high pace. At the introduction of the CD it was said that we could have studio quality at home. I feel that after 40 years this now is really happening, with equipment that can be saved for by normal people. That's it for this week. There will be another video next Friday as always at 5pm CET. If you don't want to miss that, subscribe to this channel or follow me on the social media so you'll be warned when new videos are out. If you liked this video, give it a thumbs up. Many thanks to all that support this channel financially. It keeps me independent and thus trustworthy. If you also feel like supporting my work, the links are in the comments below this video on YouTube. I'm Hans Beekhuyzen, thank you for watching and see you in the next show or on theHBproject.com. And whatever you do, enjoy the music.