Originally Posted by MichaelJHuman
IMO, the power transformer is the likely source of weight differences, not the heat sinks. The heat sinks are probably fairly light weight (aluminum I would guess.)
The power transformer is iron and copper. If it's big, it's a lot of iron and copper.
Goto a surplus electronics store, and see how heavy some of the mid size transformer are (say 400 to 600 VA rated). Or pick up an XBox 360 power supply. Pretty heavy for it's size. etc.
Agreed. There are (*gasp*) products that don't weigh "enough" and can deliver their performance claims. Sony makes a few of them, see here:http://www.hometheater.com/content/s...-labs-measures
That part weighs 28 lbs.
An Integra, with similar output abilities:http://www.hometheater.com/content/i...-labs-measures
And it weighs 12 lbs more.
Heavy facades, frames, and bulky transformers push weight up - most consumers like that. They do nothing for performance though. I'm not saying either is a "scam" - both perform - I am saying that you shouldn't judge a part by it's weight. It doesn't tell you anything. The actual "parts" for an amplifier are fairly light; ICs and transistors are not heavy.
As mjpearce023 said - don't worry so much about weight or that "last watt" philosophy; pick whatever suits your needs. I also entirely disagree with the first response "if you have 8" woofers you need the Onkyo" - no. The size of a speaker's woofer doesn't speak to efficiency or anything else; there are plenty of very efficient and very large speakers (Klipschorn as an example), and very inefficient and very small speakers. There's no "hard and fast rules of thumb" here, at least that abstract or remove the "science and thinking" part of the program.