Monoblocks, passive bi-amped or passive tri-amped?

Bi-amping, whether you advocate it or not, is one of the largest wastes of Internet bandwidth. It is argued and discussed incessantly and each side of the argument never convinces the other. Even active bi-amping is disputable these days.

In this case, if the OP really believes his speakers are underpowered, I would advise him to buy a good 200wpc amp with the emphasis on good.

Mano -- "I'm assuming that Mirage built them this way". That is unlikely: they would have supplied the crossovers separately had that been the case.

In my passive days, I invariably found that "single amping" with the (sonically) better amp invariably outperformed multi-amping with mediocre amps.

All things considered, you're probably best off using a good quality amplifier spec'd at, or above 100W / 8ohms.

If you opt for a multichannel amp, choose "quality" over higher power output specification... and drive the woofs separately.

IF you opt for a super multichannel amp, with discrete PS for each channel and you have channels to spare after hooking up whatever, you might as well drive the mids separately too.

I'll throw my 2 cents in. I currently have a pair of Mirage OM-9 that I am running in a passive horizontal bi-amp setup and they sound absolutely fantastic this way. I tried an normal stereo setup with them and they sounded ok, but nothing special. I went to the the bi-amp setup and it was like I went out and bought new speakers, the OM-9s just came to life. IMO Mirage designed their crossovers for exactly this type of setup. The amps I was using initally were NAD 2100 now I'm using a NAD 2100 for tweeters and a NAD 216 for the drivers.

I would suggest if you have or maybe can borrow and extra amp, give the bi-amp or tri-amp a try and see what you think. If you run the amps horizontally then they dont all have to be the same amp and will give you an idea if its worth spending the extra on more amps. If you are using different brand/model amps you will have to pay attention to phase as the amps may be out of phase with each other, but that is just a simple matter of flipping the wires around till you get the best sounding combination.

What amp do you have and what speaker, and the speaker configuration and sensitivity, and room size. Typically, the less amplifiers, the more simple the better...but there are exceptions...jallen