McIntosh Announces Mc451 Dual Mono Power Amplifier

tablejockey & surfmuz: I believe every MAC amp and, possibly, every MAC product allows one to shut off the VU meters and/or blue lights, if desired.

dayglow & m_j_s: Beauty is in the eye of the beholder. You know what they say about opinions, don't you?  They're like a@#@#@#s.  Everybody's got one.

As an owner of a MAC amp, I love the look, the sound and the VU meters, which are not only for show.

Lets say you get by the blue green light. Do you run different speaker cables for the Bass than you would for the Mids and Highs?

One nice thing about Mac is they don't drive their tubes hot like ARC does. The tubes in an ARC last about 2000 hours. I'm told (having not owned a Mac) that their tubes last much longer.  Also, Macs don't use a screen resister as a tube protector. When the resistor blows it flames up in a spectacular fashion. Sadly I do have personal experience with this event- twice as my bias was out of whack. 

Wow,,, looks so big and powerful. The "V8" engine of the audio world maybe?

As a factory-indoctrinated Mac sales guy, to those complaining about the appearance, I will guarantee they will not change it. It is a BIG part of their brand identity…you can buy a new Mac and integrate it with an older system, and it looks like it belongs. Huge brand loyalty builder. 
This new amp has an electronic xover built in, so to use it properly the bass speakers should be passive woofers without internal passive low pass filters. The upper speaker can be anything.  Who has passive subs, really?  Otherwise you’re messing up an engineered passive network if you “double cross”. In most systems you should not use the crossover.