Wow. I must have been psychic on this thread. I was initially going to recommend NAD, but i thought you might be offended by such. After all, many people that were buying Triangle wouldn't really think about pairing it with NAD. Not knowing your budget and then thinking about the Monarchy gear gave me an easy out. I was pretty sure that it would be both a good combo and economically reasonable.
If you listen to rock, which Triangle's aren't exactly best suited for, i see nothing wrong with NAD. If you can find an older 2600 series amp, that would give you everything that you need. Since it has built in input attenuators ( volume controls ), you wouldn't even need a preamp ( so long as you you only use one line level source ). At 150 wpc, it should drive the speakers and provide plenty of headroom to avoid clipping during normal listening.
I don't know what these run down in the Philippines, but here in the USA, they can typically be found for appr $300 - $375 or so. As a point of reference, i used one of these amps many years ago to drive Klipsch Heresy's ( which are kinda bright ) with great success. Even as efficient as the Klipsch were, i could still drive the amp into clipping. Then again, i like to "rock" just a bit more than most folks do : ) Sean
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