Cost of Keeping Components on All the Time?

The best thing to do in your case is to get a Kill-A-Watt and measure the consumption of each of your components at various times during playback.

Then you can take your electric bill and figure what the rates you are charged and input it into the Kill-A-Watt. It can give you an idea of what it would cost to run your system 24/7.

you could also do it the hard way and leave your system on 24/7 for a month and compare what you were charged.

I spoke to a guy who had Threshold SA-1 monoblocks and he kept them on 24/7 a long with the rest of his predominantly SS system and it added $25 to his first monthly bill after he got everything set-up.

Jedinite24 is correct. Try using a Kill-A-Watt meter. It's very simple to use. I use one at my house. Otherwise, you're just guessing. You enter in the cost of your electric rate and then plug in your devices. It then calculates the daily, monthly, and yearly cost. Leave it on with the equipment running on idle for about an hour and that's all you need. The Kill-A-Watt is designed to go between equipment and then accurately calculate draw. However, since you only want to figure idle time, that's all you need to do is plug it in and leave it. In reality, you will have results in as little as 5-10 minutes.

In your case, plug everything into a power strip and then put the power strip into the Kill-A-Watt and you'll have an accurate idea of the total draw of the entire system.

As you realize, the cost will vary dramatically depending on the particular components that are in the system, especially power amplifiers and components that contain power amplifiers (receivers, integrated amplifiers, powered subs). Although the $30/month figure Elizabeth provided is in the right ballpark for your system.

I looked up the power consumption specs for your components, which are available for all of them other than the Squeezebox (which undoubtedly draws almost negligible power):

DACMagic: 5 watts
SLP-05: 25W standby; 75W operating
GFA-555: 72W idle; much more when playing music at high volume
AVR-600: 3W standby; 120W idle; much more when playing music at high volume
BDP-103: 0.5W standby; 35W operating
2W Sub: 10W idle; much more when playing music at high volume
Squeezebox: ~5W (my guess)

Using "idle" or "operating" values as applicable (although I don't know how optimal leaving the SLP-05 "operating" would be with respect to tube life), that all adds up to 322 watts, or 0.322 kilowatts. Multiplying by 730 hours in an average month results in 235 kilowatt-hours per month.

Multiply 235 by your cost per kW-hr to get $/month. The additional power consumption that occurs when you are playing music would add to that.

Regards,
-- Al

If your stand-by is 200W, and average price of electricity is considered to $.15, than monthly 720hours * 0.2kw * $0.15 turns out to almost $20 monthly and $240 annually.
There are also states with $.2 kw/h and there are states with lower price point for the same.

So help electrical companies find more demand and bump higher prices. Another words it's very business-trivial: Higher demand = higher #of employees and higher expenses will end-up an increased price per unit of electricity used.