A Test. How much Voltage (power) do your speakers need? - Page 55 - diyAudio
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View Poll Results: I measured the test tone at:
2 volts or less 150 37.50%
Between 2-5 volts 137 34.25%
Between 5-10 volts 51 12.75%
Between 10-20 volts 24 6.00%
Over 20 volts. 38 9.50%
Voters: 400. You may not vote on this poll

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Old 15th February 2012, 03:12 AM   #541
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Old 15th February 2012, 04:08 AM   #542
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Quote:
Originally Posted by phivates View Post
That's what I'm talking about
There is no headroom involved though. The test will mathematically determine the maximum peak voltage your amplifier will ever be called upon to output given your maximum volume control.
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Old 15th February 2012, 06:27 AM   #543
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Quote:
Originally Posted by a.wayne View Post
Push,

What's the amp distortion spectrum at 4nW.... ? I have never seen one tested that low before ...
see, I borrowed my Audio Precision analyzer to a friend and he wouldn't return it...

to get some perspective on the measurement procedure... first I used my CD player as source so that there isn't even the slightest acoustic noise. the sine was modulated so that it's easier to detect, the ear tends to accommodate with steady tones.
second, since the amp was actually functioning as attenuator (amp vol was almost all the way down and so was the volume on the D/A), I had to measure the level at the input and compute output based on amp gain and volume pot division factor (it's a digitally controlled attenuator, it's easy to do that with precision if you know the tap). then, since the DAC output was 1mV for that setting, I couldn't use my cheap DMM to measure and used the mic input on the laptop instead, since it has pretty low distortion/noise and I know the full scale input voltage (100mV). and then I did a FFT on the acquired signal to determine the actual level of the 3kHz component, so that I don't use the peak-to-peak value which includes noise. now how twisted is that? still, if done carefully the method can be pretty accurate.
all this, obviously, until the friend returns the AP analyzer
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Last edited by mr_push_pull; 15th February 2012 at 06:30 AM.
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Old 19th February 2012, 01:59 PM   #544
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Default One Month Later

Well here we are one month later and winding down. Not yet 100 votes, but close. Thanks to all who have participated. It's nice to see DIY'ers actually doing something and not just talking about it.

The poll results speak for themselves as to how much voltage most of us use on a home system. There is a wide range with most of it fairly low - lower than I expected.

Please remember that this is not a test of amplifier or speaker quality, just a way to find about how much voltage you need to run your speakers. If you did the calculations and found that you are near the edge, you might think about a more powerful amp, or at least one with a hefty power supply. But it seems that most who took the test were not near clipping.

I hope that you all leaned something about your system, or other people's systems and maybe about how digital recordings work. Thanks for taking part.
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Old 21st February 2012, 11:01 PM   #545
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Hurray!! We hit 100 poll results on Mardi Gras. I think that calls for a drink - and maybe some plastic beads.



Should we give up speaker measurements for Lent?
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Old 21st February 2012, 11:16 PM   #546
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I think you have to make a speech...
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Old 21st February 2012, 11:24 PM   #547
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Old 21st February 2012, 11:34 PM   #548
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Speech? Cough, cough.....

Just for the record: At 100 votes we have
  • 36
  • 36
  • 17
  • 4
  • 7
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Old 21st February 2012, 11:38 PM   #549
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Horaaah for the over 20 volt crowd .....
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Old 21st February 2012, 11:40 PM   #550
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You should be leading a cheer for the under 2 ohm crowd.
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