Mackie HR 824s are flat (within 1.5dB) from all the way up at 22.5KHz way down to 39Hz - thats flatter than the Netherlands, East Anglia and the salt flats of the US combined!!!
Anyway, in the mix, 60Hz is Kick energy, Bass Guitar energy is higher. If you're being recorded, the engineer/prod might have put a (not too) low cut filter on the Mic/Preamp/DI/etc. Don't forget your £15/$30 computer speakers which have probably dropped off 3, 5 even 10 dB by 100Hz will still let you hear the lower bass and the even lower kick.
DON'T MONITOR TOO LOUD - This will irrepairably damage your hearing; same with being both sides of the stage and Discos. It breaks down to whether you want to do what it takes to make you sound brilliant or get someone in (at some point) to make you sound brilliant for you.
Take care of your hearing!
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