Amplifier Efficiency
04-04-2005, 05:32 PM
#12
Originally posted by veeman:
how about at 25%,50%,75% and 100%? That would give you a more complete picture of the amplifier's ability. I rarely use over 75% of my amplifiers output.
how about at 25%,50%,75% and 100%? That would give you a more complete picture of the amplifier's ability. I rarely use over 75% of my amplifiers output.
if an amp is running a 5%and have a power of 10%of the # thay say it runs at then what does that say about that amp
if i run an amp at 100% and the power is 83%but if its at 5% and the power is 8.3% the amp is s###!
in the decks out there if max power you get 5w but if its low the power is 1/2w that is why out can get an line amp that will get it up to an 8w all the time
04-04-2005, 10:35 PM
#13
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Posts: n/a
Originally posted by dumbest:
</font><blockquote>quote:</font><hr />Originally posted by veeman:
how about at 25%,50%,75% and 100%? That would give you a more complete picture of the amplifier's ability. I rarely use over 75% of my amplifiers output.
</font><blockquote>quote:</font><hr />Originally posted by veeman:
how about at 25%,50%,75% and 100%? That would give you a more complete picture of the amplifier's ability. I rarely use over 75% of my amplifiers output.
if an amp is running a 5%and have a power of 10%of the # thay say it runs at then what does that say about that amp
if i run an amp at 100% and the power is 83%but if its at 5% and the power is 8.3% the amp is s###!
in the decks out there if max power you get 5w but if its low the power is 1/2w that is why out can get an line amp that will get it up to an 8w all the time </font>[/QUOTE]I am not quite sure what you are saying here, but all amps lose efficiency as power output goes down.
04-05-2005, 11:43 AM
#14
i know that but it would be nice to see the #s.
if an amp is on low it would be nice to see the power #s so the SQ would know more how there speakers will work with that amp. i do not do SPL i do not run may amps at full power so the power #s they give do not tell me what i need to know. i like good power at low not at max power
if an amp is on low it would be nice to see the power #s so the SQ would know more how there speakers will work with that amp. i do not do SPL i do not run may amps at full power so the power #s they give do not tell me what i need to know. i like good power at low not at max power
04-05-2005, 04:38 PM
#17
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Posts: n/a
Sorry gang - having a computer meltdown and some clients in town.. Busy busy...
Veeman and dumbest - I'd love to be able to do that, but I'd have to send you guys a bill for an addition $50 for each test report - just no time for fun and frivolity like that...
I'll look into option of doing a 1/3 power and full power number. But here's where it gets tricky - do I use 1/3 of actual (measured) full power, or 1/3 of rated power? thoughts?
How do I test efficiency? Quite simple - I use two Fluke multimeters and an ammeter. I simply measure the current and voltage going into an amp and the power produced by the amp then do the math. The trick is setting all the channels to clip at exactly the time / level and reading the numbers simultaneously - a few amps started to loose efficiency as they heated up. I do try and give everything the benefit of the best possible conditions for testing... It's the same reason I break in all subwoofers and midrange drivers before listening or measuring them.
Veeman and dumbest - I'd love to be able to do that, but I'd have to send you guys a bill for an addition $50 for each test report - just no time for fun and frivolity like that...
I'll look into option of doing a 1/3 power and full power number. But here's where it gets tricky - do I use 1/3 of actual (measured) full power, or 1/3 of rated power? thoughts?
How do I test efficiency? Quite simple - I use two Fluke multimeters and an ammeter. I simply measure the current and voltage going into an amp and the power produced by the amp then do the math. The trick is setting all the channels to clip at exactly the time / level and reading the numbers simultaneously - a few amps started to loose efficiency as they heated up. I do try and give everything the benefit of the best possible conditions for testing... It's the same reason I break in all subwoofers and midrange drivers before listening or measuring them.
04-05-2005, 05:48 PM
#19
Originally posted by Dave_MacKinnon:
How do I test efficiency? Quite simple - I use two Fluke multimeters and an ammeter. I simply measure the current and voltage going into an amp and the power produced by the amp then do the math.
How do I test efficiency? Quite simple - I use two Fluke multimeters and an ammeter. I simply measure the current and voltage going into an amp and the power produced by the amp then do the math.
true RMS current meter?
signal used ?
example of the math ?
How do you tell if its clipping?
