Well, there is not a lot of info to go on here. While the amplifier that you have makes a difference, the larger considerations in choosing a speaker are your room, your taste in music, and your budget.
please answer these questions and I'll give you some suggestions.
how large is your room? what are your listening habits (loud, soft, background music, or dedicated listening)? how much money would you like to budget for speakers?
While the POA-1500 is a very well built and nice sounding amp, I would not use it with nominal 4ohm speakers. It just does not have the low impedance driving capabilities. Very sensitive protection circuitry. I used this amp all day long at mid/high volumes with a pair of Klipsch forte's and this combination was wonderful. For kicks and giggles I hooked it up to my Klipsch RF-63's(3--6.5" woofer array) and after some high volume listening sessions, the POA-1500's protection circuitry triggered and shut the amp down.
Oh yes, I almost forgot, those big meters are cool.
There are hundreds of speakers you can get. If I listed all of them, how would you know which is best for you and your amp?
I suggest you understand your amps limitations and then go out and audition a variety of speakers that your amp can properly drive and that are within your budget. Then pick the one that sounds best to you. Have fun doing it too.
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