The Yamaha is a $900 integrated. The speakers are about $1750/pair. I've heard neither, but if this was all you had, I'd recommend improving the power. But you have good power in the MAC gear. They should sound better with the MAC gear but if they don't, I see why your friend would say get better speakers.
Here's the thing: I've heard the Special 40. It's a great sounding speaker, but it deserves a really good amp. I don't think the Yamaha would do it justice. You could get a pair on trial and see what you think and upgrade the amp later.
OR: You might also consider trading in both amp and speakers. The Dynaudio Evoke series sounds pretty great, too, and along with a new amp for them, you might wind up spending the same as the Special 40's but the amp/speaker synergy would be overall, better. Consider the Dyn Evoke 10 or 20 along with a good integrated with some power.
Here's the thing: I've heard the Special 40. It's a great sounding speaker, but it deserves a really good amp. I don't think the Yamaha would do it justice. You could get a pair on trial and see what you think and upgrade the amp later.
OR: You might also consider trading in both amp and speakers. The Dynaudio Evoke series sounds pretty great, too, and along with a new amp for them, you might wind up spending the same as the Special 40's but the amp/speaker synergy would be overall, better. Consider the Dyn Evoke 10 or 20 along with a good integrated with some power.