Both of those speakers I mentioned have a subwoofer output. I know the Klipsch R-15PM can accept 240 volt, not sure about the more-affordable Audioengine A5+.
Shipping does seem to be your second biggest problem. Low budget is the bigger one.
Yes... Shipping is really expensive for me. Especially the customs tax... 34.6% on most audio related devices.
The fact that they have a sub out is cool and all... But I need a sub as well... The r15pm is 500$ alone. The a5+ is 400$.
I need a max 250$ if I want to move to powered speakers.
Maybe the Kanto yu3 at 269$... But I don't really want to pay for Bluetooth. Even though it might be nice. Or the yu2...
Also maybe I should say I have a WiFi router fairly close to the speakers location. And I know the Presonus eris speakers get interference when placed close to a router.
Maybe other powered speakers will get it as well.