I've done the Beocreate mod on the CX50s and RL6000s (active crossover profiles also available for the S30s).
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Setting up the software and testing if everything works... (that other pair of CX50s is waiting for refoaming)
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The barrel plug power connector and 4-pin mini-XLR connectors.
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Close up of my hack-job which was covered up with the heat-shrinking wire sleeves.
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This project was the first time I tried soldering... here I accidentally melted the pin off the plastic connector because I was too slow.
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The 4-core mini-XLR cable that connects the speakers together. The cable is a bit thick, but it's really soft/bendy and doesn't hold shape.
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The old gasket was a bit chewed up so I cut a new one from white foam.
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I didn't follow the instructions and kept the passive crossover and DIN connector just so I could reverse the mod if I ever wanted to. I had to drill a small hole in the bottom left corner for the barrel plug connector. I also unscrewed the wall-mount support and used the hole (which was perfectly sized) for my 4-pin mini-XLR connector which connects the left speaker drivers to the amplifier.
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I thought they sounded pretty good in near-field desk setup and in smaller rooms, but the aluminum speaker housing blocks Bluetooth and WiFi signals too much which made them very frustrating to use.
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In the end I moved the amplifier into a single RL6000 and removed the Raspberry Pi. Instead of the RPi I made a TOSLINK pass-through connector for the back of the speaker so it could be used in multi-room with a Chromecast Audio, Airport Express, etc. I think it sound really good, I've always wanted to mod the other RL speaker so I could hear it in a stereo setup, but can't really justify the $$$ for that experiment, and I definitely don't need more speakers at the moment.