Personally I consider 808 bass to be in the category of sub bass, under 50Hz.
I'd recommend mixing sub bass by keeping it clean up to 50Hz, and cut off the kick drum's frequencies at 50Hz. That way the two signals should not clash. Then you can tighten their interaction up with compression over the kick & the sub bass.
Treat the bass frequencies as one unit by routing them through the same mixer channel, then add your compression.
Equalisation (50Hz) -> Signal Routing (2 separate channels into one Single Channel) -> Compression
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Yeah, Nice tips, I've just been tryig to play with the 50 Hz on the 808 and it sounds cool and clean. Still have to process the compression. But one thing is weird, this subass sometimes makes me feel some strange physical reaction! It happens that make me feel nauseous, maybe the frequencies equalized!
I'm using the MClass equalizer from Reason. Thanks for the link I'll check it as soon as possible. I'm currently mixing my tracks with tips I've picked from various internet links. But if there some accurate rules to follow to make the 808/subass perfect, it's perfect!