Re: How much power do I need - m60 measurements
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Joined: Feb 2006
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OP
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I don't recall seeing a mention, about THD specs in the thread
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I don't have any instruments handy to measure the THD. However, Onkyo specs are 0.08%, power rated. I think that since I'm way under the power limit that number should be correct.
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Re: How much power do I need - m60 measurements
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Joined: Jun 2005
Posts: 1,189
connoisseur
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connoisseur
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Terrific experiment Gena! I have the same kind of curiousity about this as you do, but never did anything about it. Now I don't have too I thank you for your efforts.
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Re: How much power do I need - m60 measurements
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Joined: May 2004
Posts: 1,201
connoisseur
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connoisseur
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In reply to:
My other hobby is photography. You’d be surprised how many people buy ten’s of thousand dollars worth of equipment and then spend all their time taking pictures of brick walls, comparing the sharpness of this to that, resolution of this to that… No money left over to make good prints or travel to photographic locations.
So...which lens is sharper? Leica or Zeiss? I used to read those photo forums quite religiously. I know exactly what you're talking about. Made me chuckle a bit.
*Michael* AV123 Refugee - X-LS Encore, X-Voce, X-Omnis, Elt-Dpa's Denon AVR-591 Magnavox NB500MGX BDP
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Re: How much power do I need - m60 measurements
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Joined: Mar 2004
Posts: 27
hobbyist
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hobbyist
Joined: Mar 2004
Posts: 27 |
Gena,
Thanks for this post, I was wondering how a separate multi-channel amp would affect my sound as I hear some strain in some loud(not wake the dead ear splitting) vocals. But I am way to stupid and lazy to do measurements.
With 1kHz tone
“Vrms (V) -- Power (W) --Sound Level (dB)
6.0 //4.5 //85 Really loud “
With 5.1 music
“At the receiver volume of -10dB the sound level was 85dB – this was the maximum I can listen to for some extended time. The average voltage on the speaker was about 2V – this is 0.5W of rms power and the peaks were up but never higher than 10V – this is 12W of power.”
These power measurements are 1 channel then 1 of the 5 channels for music ? Amazing how much power the powered subwoofer saves the channel amps.
JohnK,
That article is fantastic, makes a good case for BLIND testing.
Looks like an amplifier does not have much effect on signal quality and buys only undistorted volume, which is what I need if I want to crank it up. I would not go further than something like the 200 Watt Outlaw. My receiver(Yamaha RX-V2400) spec., is 120 Watt rms per channel. Even if that’s shared between the front 3, the Outlaw buys me 200 W rms vs. 40 W rms only half again as loud ? Am I looking at this correctly ?
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Re: How much power do I need - m60 measurements
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Joined: Apr 2005
Posts: 2,339
connoisseur
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I agree with the numbers as presented but do find my sentiments follow this line of thought.
As I have said before, "It all may be between my ears".
Bug
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Re: How much power do I need - m60 measurements
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Joined: Dec 2005
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Another good article, I think more than a few of us have the same thing between our ears
A computer once beat me at chess, but it was no match for me at kick boxing.
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Re: How much power do I need - m60 measurements
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Joined: Feb 2006
Posts: 120
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OP
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These power measurements are 1 channel then 1 of the 5 channels for music ? Amazing how much power the powered subwoofer saves the channel amps
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Right. These measurements are for one channel with all the rest 5.1 (or 7.1) ON including the sub. So they all kick in. The mains are relieved from the bass duties and the 500W of EP500 are doing all the hard work.
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Re: How much power do I need - m60 measurements
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Joined: Feb 2006
Posts: 120
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So...which lens is sharper? Leica or Zeiss?
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Oh, don't get me started . Besides, I'm content with Canon 20D and my 135L. The lens is a marvel
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Re: How much power do I need - m60 measurements
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Joined: Jul 2004
Posts: 4,444 Likes: 16
connoisseur
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connoisseur
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A WATT is a mathematical sum of voltage and current. (One watt equals the production or use of one joule of energy per second)
What is missing with the synopsis that “a power amp” only requires X Watt’s to effectively drive a set of speakers, does not take into consideration that while ONE WATT may be ample to drive a set at some deafening SPL, that ONE WATT may require 60 amperes of current. 120 VAC @ 60 amperes is roughly 7200 Watts.
This is where low end (low current capable) amplifiers can not supply the required current (amperes) to drive those speakers. IE: highly efficient 4 ohm speakers such as the M80.
For example, I have a POS AVR that I picked up at Costco a few years back for a HTIB system that was “rated” at 120 watts per channel. As an experiment, I hookep up my M80’s to it, and it would immediately go into overload protection and shut down when I would try to power it up. I then hooked up a set of M3’s to it and it would power up, but would shut down at half volume.
I’m far from being anywhere close to an EE and would be interested in your thoughts in regards to this (Gena / John).
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Re: How much power do I need - m60 measurements
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Joined: Jul 2004
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aficionado
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aficionado
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Interesting stuff. I just want to know where can i get a 5 watt HT receiver with all the options i want.
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