DJ Monitors.

B and C 15PZB100.

I would filter any bass below 50hz on the monitors anyway.. no need.

They are made by TonyASS. They are featured earlier in this thread.

As a DJ and engineer I'd say the most important thing is something with as soft a top end as possible and a clearly defined bottom end. One of the main things DJs are listening for whilst mixing is the bass area so if its muddy or rolls off to high the monitor is going to be turned up louder to try and compensate. The best DJ monitoring setups normally have a seperate sub to give the DJ the same bass the dancefloor gets.

If you can do without a compression driver do it, if not use a decent one and max size of 1" - then cross it as close to 4 or 5kHz as you can. When you're standing 2 feet away from it for hours on end the last thing you want is ringing ears caused by a distorting HF. We've got a Res 1 + F118 monitor setup in the booth and DJs have noted they get nowhere near the earache they used too and mixing has improved no end due to the increased clarity in the monitoring.

Also as Tony said - DJs will always want it louder, so design something which will virtually kill them at high volume so that they keep it at a reasonable level. If you put something which is underpowered or 'just enough' in they will blow it up or burn it out within weeks.

Oh and horn loaded LF helps stop feedback from turntables too.

Anyone find that though positioning is critical.

It is so often compromised by circumstance and the best monitors can seem inadequate. 

Situations such as the nasty slap off the back wall yet the promotor wants to minimise the footprint on the dance floor pushes the dj right back and the wedge ends up facing said wall and accentuating the problem. 

The red arch in se1 is a good example where the constant chatter of reflections richocheting wildly drives dj's to the point of utter desperation.  Headphones jammed on one ear, head stuck in a wedge, eyes rolling sweat flying and  only 32 bars left  to sort it out.

...........  sweet sight but not ideal and it means something has to suffer.