Just a few notes:
Indeed keep the meat of the kick mono instead of trying to spread the whole thing to stereo. If you'd specifically like the kick to sound like it has a wide stereo field, layer a more hi-freq sound with wide stereo presence on top of it, or separate a high component from the kick with a parallel signal chain which has a firm highpass on it, and widen that instead of the whole kick.
Drfish wrote:Superchibisan -40db threshold? WTF? Are you sure you mean -40db?
It's all relative to the signal strength you're feeding into the compressor. As we're dealing with 32 bit signals here, there's so much bit depth you can very well have your mix components so quiet that a threshold that low makes sense. Always adjust compressor parameters according to the signal strength.
Drfish wrote:Coupled with your suggested ratio of 4:1 which will reduce every 1 db over the threshold by 4db. Your talking nearly 160db of reduction here?
That's not quite how a compressor works. The ratio on a compressor means the ratio of the compressor output in relation to the input signal which goes above the threshold level. If you have a ratio of 4:1, it means for every db going above the threshold only 1/4 of that amount gets through.
To illustrate: if the threshold is at -20 db, the ratio is at 4:1 and you feed the compressor a signal of -16 db (4 db above the threshold), the fully compressed signal after the attack will be at -19 db (1 db above the threshold).