GOLF CART BUILD- Amp Suggestion

[skynoverya550]

Hi all 

 

I have a new 6 pass golf cart that I have a full system in..everything installed and working, very loud for a cart.. just want to clean up my amp situation. 
 

HIGHS- THREE pairs of kicker 8” 45KM84L

 

DECK- MB Quart GM-3 

 

SUB- HI-Q 6.5 d2 in a spec sealed box 

 

AMP- Rockville RXM-3 1600 4 channel 

 

I have all the highs running off channel 1/2 and I have the sub bridged using channel 3/4. I feel it’s overworking the amp since is a fairly cheap amp. 
 

looking for either one amp that can do it all and not be stressed or keep the current amp for the highs and add an additional for the sub. 
 

space is a small factor so I was looking at the candy micros or NVX amps. 
 

Thanks in advance!!!