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Impedance plays a small part but not a big part since most output stages will be opamps and quite happy to drive hard into 600 Ohms or lower
I can't restate this enough though - if you're putting bass and kick drum through the PA then you need subs, or at the very least, one (they're essentially non-directional, so position and projection isn't an issue). If you try to put bass and kick through the Mackies you will drastically limit their headroom and clarity for the rest of what's going through them. A powered sub would probably be easier now that the old ones have gone, and allow you to go to an unpowered desk - although if you're going to keep the Behringer then you could make use of its power amp and drive a passive sub. Currently you're carrying around a 1600W power amp which you can't use for anything.
Personally I think you've done this the wrong way round - you should have got better passive tops to run from the Behringer's power amp, and powered subs rather than powered top cabs. The Behringer even has a dedicated output to drive one, with a sub filter frequency control (the Mono Out). Or you could patch that into the Power Amp Inserts to use it to drive a passive sub.
https://media.music-group.com/media/PLM/data/docs/P0A8O/PMP6000_PMP4000_PMP1000_M_EN.pdf
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Feedback
The Mackie input are combo sockets and will accept balanced or unbalanced jack, or balanced XLR connections.
If it were me, I'd do some tests like plug in a TRS plug to an output of the Behringer and test whether the ring is shorted to the shield or not. If it's balanced, I'd make up a TRS jack to XLR cable; if unbalanced, I'd just use a regular jack-jack cable.
R.
Eqd Speaker Cranker clone
Monte Allums TR-2 Plus mod kit
Trading feedback: http://www.thefretboard.co.uk/discussion/60602/
If he wants to buy good quality leads, I can make them to order - Neutrik connectors, Van Damme cable (see here for a few more details). It would be about £24 for a 10m lead - male TRS Jack to male XLR. Message me if interested.
R.
Eqd Speaker Cranker clone
Monte Allums TR-2 Plus mod kit
Trading feedback: http://www.thefretboard.co.uk/discussion/60602/
Your choice now is to either get passive subs to run from the Behringer's own power amp, or to start on an upgrade path with powered ones which will mean you can replace the Behringer with a standard desk eventually. You can keep the cost down initially by only buying one sub, if you want.
If he hasn't got rid of the spare passive top cabs, make sure he doesn't - for now, you've still got the backup option of running them from the Behringer if you need.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
@icbm yeh, need to have a discussion about which step is next, I've already said keep hold of the tops for backups!