What do I need to add to 2 *350 subs to make a full PA

Hi Im building a small PA for reggae and house gigs.

I have 2 good 350W subs, I was using 2 150W KAM speakers as tops up until now.
We have had a few successful gigs and want to take the PA to the next stage by adding a crossover &
proper tops. Up until now i have been daisy chaining the the system from one 2 channel tAmp - 2x 500 W at 4 Ohm, 2x 350 W at 8 Ohm

1) Are proper tops just new speakers sitting on top of subs or are they a specific type of speaker (or both)
2) What size tops should I have to balance with 2* 350W subs
3) Can you recommend a good crossover ?, is it worth using a crossover, should i just stay with daisychain.

Thanks in advance, apologies for the novice questions but you have to start somewhere I suppose :)
 
Yes a crossover will make a big difference. An used analog active unit like a Rane AC22B or DBX 223 would be relatively inexpensive and the best way to utilize it is to use Ch1 for subs and Ch2 for the tops, that also means Ch1 of the amplifier is subs and Ch2 is tops... so the system is now mono. If you want stereo you need a second amplifier.
 
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