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Old 24th January 2018, 01:22 PM   #1
SamAnytime is offline SamAnytime  India
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If someone is looking to manufacture a modest series of audio amplifiers, say 3 to 5 models, tops, which ratings should these models have?

Obviously, it is not feasible to have a whole range of models, ranging from 50W to 5000W in 50W increments, so I'm looking for some input. Which wattages sell best?

Let's say I decide on three models: 100W, 200W and 500W per channel. Are these okay, or will I find out later that no one wants the 100W, whereas 150W would have been a better choice?
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Old 24th January 2018, 01:37 PM   #2
globalplayer is offline globalplayer  Germany
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85, 175, 350 on 8 ohms.
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Old 24th January 2018, 01:37 PM   #3
Kay Pirinha is offline Kay Pirinha  Germany
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I'm not aware of any rule of thumb, but 1-2-5 steps make sense to me.


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Old 24th January 2018, 02:19 PM   #4
billshurv is offline billshurv  United Kingdom
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Suggestions for amplifier ratings
As you need 10dB increase to be twice as loud, 10W, 100W and 1000W seems to cover the bases. Or in other words, if 10W isn't enough 50W will also not be enough!
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Old 24th January 2018, 02:58 PM   #5
mchambin is offline mchambin  France
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Quote:
Originally Posted by billshurv View Post
As you need 10dB increase to be twice as loud, 10W, 100W and 1000W seems to cover the bases. Or in other words, if 10W isn't enough 50W will also not be enough!
You mean 10dB to be ten times as loud.
This makes sense from a technical point of view. I approve the dB approch.
Not sure it is ok from a commercial or emotional behavior.

What about 9dB steps ( x 8) : 10W 80W 640W
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Old 24th January 2018, 03:03 PM   #6
SamAnytime is offline SamAnytime  India
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Cool. Thanks all. Now what about headroom/ onset of clipping above rated power? E.g. for a 100W amp, should it be clean up to 100W sine wave, then slowly start distorting/ limiting as the amp goes into overdrive? Under worst case overdrive, the amp is essentially putting out a square-ish wave, which, even at the same peak voltage as the clean sine wave would be about twice the rated power. If you allow that the peak voltage at full overdrive is 120% of the peak voltage of the rated power sine wave, then at full overdrive the amp is putting out 3 times the rated power.

Have I got the figures right (approx) or have I totally lost it?
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Old 24th January 2018, 03:24 PM   #7
billshurv is offline billshurv  United Kingdom
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Quote:
Originally Posted by mchambin View Post
You mean 10dB to be ten times as loud.
Nope, I mean what I said. To get to a perceived doubling of volume you need a 10dB increase in power. The ear is non-linear.
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Old 24th January 2018, 03:49 PM   #8
scottjoplin is offline scottjoplin  Wales
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If you are "looking to manufacture a modest series of audio amplifiers" I think you need to decide how much you want to confuse the purchaser, ie. RMS, peak or wattnot
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Old 24th January 2018, 03:55 PM   #9
SamAnytime is offline SamAnytime  India
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RMS, for now. We can think up the marketing shenanigans later, if at all. RMS watts into 8 ohms.
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Old 24th January 2018, 04:07 PM   #10
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by SamAnytime View Post
for a 100W amp, should it be clean up to 100W sine wave, then slowly start distorting/ limiting as the amp goes into overdrive?
Quote:
Originally Posted by SamAnytime View Post
RMS watts into 8 ohms.
In that case 100Wrms is all the victim needs to know
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