I think the majority of people use the old V array on the e.q. settings, and simply boost the lows and highs, therby drowning the mids.
There are presets in the S850 specifically for internal speakers, line-out to p.a., etc. There is also one called "flat" that is a good starting point, and may be all that is needed.
I believe 99 percent of people boost almost every band of e.q. This makes it louder overall but introduces noise and can overdrive speakers. If you use e.q., CUT the offending frequencies. The overall sound will be the same as boosting, using the same curve.
DonM