Denon's 1900 Series Question

[Ares]

I have been reading a lot to increase my knowledge of this hobby which has become an obsession. As I read there is one thing I have noticed that Denon receivers have been losing weight over the years which has me wondering how are they doing this and still maintain a decent WPC for all of these years since weight is usually an indication of a good power supply, so I turn to the people who would have greater knowledge in this area than I to hear how this is possible. So I will give examples in the 1900 series, from the 1905 to 1911 to be exact. So here we go:

Denon AVR 1905 WPC 80@8 ohms, weight 26.2 lbs

Denon AVR 1906 WPC 85@8 ohms, weight 25.8 lbs

Denon AVR 1907 WPC 85@8 ohms, weight 26 lbs

Denon AVR 1908 WPC 90@8 ohms, weight 24.7 lbs

Denon AVR 1909 WPC 90@8 ohms, weight 25.4 lbs

Denon AVR 1910 WPC 90@8 ohms, weight 23.6 lbs

Denon AVR 1911 WPC 75@8 ohms, weight 20.4 lbs

I pulled this info from each receivers manuals, from the info here the 05,06 and 07 were trying to stay within 26lbs and WPC 80-85, the 08 and 09 within 25lbs and a bump in WPC of 90, this is were things start to really change, the 1910 losses 2 to 3 pounds from it's predecessors and still maintains it's 90 WPC now the new model the 1911 has WPC 75 and is only just above 20lbs.

So in a nutshell from the 1905-1911 there has been a weight loss of 6lbs, now I know that over the course of time materials change and the use of lighter components but 6lbs. Will this trend tapper off or will Denon continue year after year reducing the weight of it's receivers.

 

[Ares]

Help a brother out.

 

[GlocksRock]

Nobody but Denon can say if they will continue to trim the amp sections as a tradeoff to other features. If they added preamp outputs to their lower end receivers it wouldn't matter as you could add amps as you see fit. I would likely be using my Denon AVR-1910 in my bedroom instead of my Yamaha RX-V663 if it had preouts... but since it doesn't I'm sticking with my yamaha.

 

[Ares]

Ok see that's were my confusion comes from, is it the amp section that adds most of the weight or is it the power supply? or are they considered one in the same? bear with me my knowledge in this area is not deep more like a puddle.

 

[GlocksRock]

the power supply is related to the amp section... the power supply powers the amp(s)

 

[Ares]

Got it, so in order for them to drop weight, that would mean they trimmed that weight from the amp section. So if I understand you correctly this would lead to a decrease of WPC to which would explain the WPC of the 1911.

 

[GlocksRock]

That is correct... but WPC is also dependent on how it's measured... it may me 75 watts at full bandwidth, but they could do what some other manufacturers do and measure it at 1 khz. or 6Ω which would yield higher numbers, but hopefully Denon wouldn't do their measurements that way.

 

[Ares]

This was the info I got from the manual

90 watts per channel x 7 channels (8 ohms, 20 Hz to 20 kHz, .08% THD)
125 watts per channel x 7 chanels (6 ohms, 1kHz , .07% THD)

 

[GlocksRock]

so 90 watts is a truer representation of the amp, but just look at those numbers and how it's measured when shopping for a receiver. Denon is pretty good about making it's rated power.