How do I know the true wattage output of my receiver? - Blu-ray Forum

Big Daddy · 04-09-2009, 01:39 AM

For an approximation, do the following:

Buy a voltmeter from Radio Shack or other electronic stores.
Connect the voltmeter to the speakers leads.
Start the receiver/amplifier.
Play a test tone (e.g., 1kHz).
Turn up the volume and note the volts on the voltmeter.
Square the volts and divide it by the resistance and that will give you power.

Power = V^2 / R

A better way is to connect big resistors to all the channels and use an oscilloscope. Details are in this link.

crazyBLUE · 04-09-2009, 01:47 AM

Quote:

Originally Posted by Big Daddy

For an approximation, do the following:

Buy a voltmeter from Radio Shack or other electronic stores.
Connect the voltmeter to the speakers leads.
Start the receiver/amplifier.
Play a test tone (e.g., 1kHz).
Turn up the volume and note the volts on the voltmeter.
Square the volts and divide it by the resistance and that will give you power.

Power = V^2 / R

A better way is to connect big resistors to all the channels and use an oscilloscope. Details are in this link.

GEEEEEEEEEEEZ BD ~ Now I'm confused ! Power = V^2 / R ----

Big Daddy · 04-09-2009, 02:00 AM

Quote:

Originally Posted by crazyBLUE

GEEEEEEEEEEEZ BD ~ Now I'm confused ! Power = V^2 / R ----

Aren't you glad I didn't give you this formula?

Formula15-9.jpg

crazyBLUE · 04-09-2009, 02:09 AM

WHAT THE HEK IS THAT !! Please don't tell me , I'm sure I don't want to know !!!

Blu Titan · 04-09-2009, 02:11 AM

Quote:

Originally Posted by Big Daddy

Aren't you glad I didn't give you this formula?

Attachment 5682

Big Daddy is the ultimate audio freak. I will bet that he has this formula as his desktop wall paper.

Big Daddy · 04-09-2009, 02:13 AM

Quote:

Originally Posted by Blu Titan

Big Daddy is the ultimate audio freak. I will bet that he has this formula as his desktop wall paper.

No, actually I wrote a book that has this formula in it. It is a regression formula that you use in a course in statistics. It has nothing to do with audio.

Slec · 04-09-2009, 02:30 AM

Quote:

Originally Posted by Big Daddy

No, actually I wrote a book that has this formula in it. It is a regression formula that you use in a course in statistics. It has nothing to do with audio.

I was about to call B.S.

I have that bad boy memorized.

lucv13 · 04-09-2009, 04:39 AM

Quote:

Originally Posted by Big Daddy

Aren't you glad I didn't give you this formula?

Attachment 5683

Do you play on that tv show Numb3rs

Zman2k2 · 04-09-2009, 05:53 PM

Yeah, I figured that I'd need to get it tested, but that is of course rather expensive. Big Daddy, thanks for the formula. I may give that a shot, as I already have a decent voltmeter, so I may go searching for a few test tones to download and try out.

I don't really know why this came up, but I was just curious. I guess as Zixxer said, I wonder how alot of companies come up with the rated power of a certain receiver. I was reading the magazine, and then last night, I was flipping through the manual on my receiver, and I wondered if I'm really getting the 150W @ 6ohms that I'm currently set-up for.

Big Daddy · 04-09-2009, 11:56 PM

Quote:

Originally Posted by Zman2k2

Yeah, I figured that I'd need to get it tested, but that is of course rather expensive. Big Daddy, thanks for the formula. I may give that a shot, as I already have a decent voltmeter, so I may go searching for a few test tones to download and try out.

I don't really know why this came up, but I was just curious. I guess as Zixxer said, I wonder how alot of companies come up with the rated power of a certain receiver. I was reading the magazine, and then last night, I was flipping through the manual on my receiver, and I wondered if I'm really getting the 150W @ 6ohms that I'm currently set-up for.

You can't pay too much attention to numbers. If your system sounds good, enjoy it and leave it at that. If you worry too much about everything and try to micro manage it, it will drive you crazy and make you sick.

jomari · 04-10-2009, 12:02 AM

as mentioned earlier, most of the specs issued by companies arent as accurate as we'd like them to be. zman hit the money shot on that posting, and also discusses why we, as consumers, need such regulation. all these specs are done within their compounds, and can mislead the consumer towards it. thats why we have websites (including sound and vision

) and more importantly, forums. most researches, testing, evaluation et al, done by 'professionals' are unbiased in such cases. if there was ever a counsel on this topic, we have Big Daddy up as one of them.

of course, id be secretly playing militia to counterbalance his opinions.

petenad · 04-10-2009, 04:15 PM

Quote:

Originally Posted by Big Daddy

Aren't you glad I didn't give you this formula?

Attachment 5683

Isn't this also the formula to light speed space travel

04-09-2009, 01:39 AM	#1
Big Daddy Blu-ray Champion Top ranked HT gallery Member since:Jan 2008 Location:Southern California Home Theater Gallery:79 Blu-ray collection:122 Trading Score:1	For an approximation, do the following: Buy a voltmeter from Radio Shack or other electronic stores. Connect the voltmeter to the speakers leads. Start the receiver/amplifier. Play a test tone (e.g., 1kHz). Turn up the volume and note the volts on the voltmeter. Square the volts and divide it by the resistance and that will give you power. Power = V^2 / R A better way is to connect big resistors to all the channels and use an oscilloscope. Details are in this link.

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04-09-2009, 02:09 AM	#4
crazyBLUE Moderator Top ranked HT gallery Top contributor Member since:Aug 2008 Location:Pacific Northwest Home Theater Gallery:89 Blu-ray collection:479 DVD collection:1 Blu-ray reviews: 38 Trading Score:30	WHAT THE HEK IS THAT !! Please don't tell me , I'm sure I don't want to know !!!

04-09-2009, 05:53 PM	#9
Zman2k2 Blu-ray Guru Top contributor Member since:Jan 2008 Location:Calgary, Canada Home Theater Gallery:5 Blu-ray collection:136 Trading Score:54	Yeah, I figured that I'd need to get it tested, but that is of course rather expensive. Big Daddy, thanks for the formula. I may give that a shot, as I already have a decent voltmeter, so I may go searching for a few test tones to download and try out. I don't really know why this came up, but I was just curious. I guess as Zixxer said, I wonder how alot of companies come up with the rated power of a certain receiver. I was reading the magazine, and then last night, I was flipping through the manual on my receiver, and I wondered if I'm really getting the 150W @ 6ohms that I'm currently set-up for.

04-10-2009, 12:02 AM	#11
jomari Moderator Top contributor Member since:Nov 2007 Home Theater Gallery:18 Blu-ray reviews: 2 Trading Score:2	as mentioned earlier, most of the specs issued by companies arent as accurate as we'd like them to be. zman hit the money shot on that posting, and also discusses why we, as consumers, need such regulation. all these specs are done within their compounds, and can mislead the consumer towards it. thats why we have websites (including sound and vision ) and more importantly, forums. most researches, testing, evaluation et al, done by 'professionals' are unbiased in such cases. if there was ever a counsel on this topic, we have Big Daddy up as one of them. of course, id be secretly playing militia to counterbalance his opinions.

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