Yamaha DTXpress/DTXplorer/DTXtreme

>  
> I'll ask for the yorkvilles in the music shop, thanks. 
>  
> By the way, I have an old power amplifier (200W RMS, 4 Ohm, mono). 
> Do you think that I can just go with a non-powered monitor whith 
> that?
 I own the non-powered ones under-powered by a 40w /channel NAD amp.
It's too bad you only have a mono amp but it will definately work.  You also get a 2 year warranty where you can drive over the thing and 
get a replacement free of charge.  I have not read one single opinion or review that didn't like these speakers.  The only drag that I can 
think of is that not many stores carry Yorkville in the US.
Good Luck,
Jun