A Test. How much Voltage (power) do your speakers need? - Page 75 - diyAudio
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View Poll Results: I measured the test tone at:
2 volts or less 155 37.80%
Between 2-5 volts 139 33.90%
Between 5-10 volts 52 12.68%
Between 10-20 volts 25 6.10%
Over 20 volts. 39 9.51%
Voters: 410. You may not vote on this poll

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Old 12th November 2012, 03:08 AM   #741
Pano is offline Pano  United States
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Thanks Chris. I think it would be about 10 volts at the -12dbFS point, but anyway you actually know the max voltage you need, which is great.
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Old 12th November 2012, 04:59 PM   #742
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I did the test,
I knew my old Tannoy speakers were efficient but this seems just a little too efficient?
I listen very often to internet radio, Live365, almost exclusively to Baroque24/7.
I downloaded both test tones on to my laptop, the same laptop I listen to internet radio.
With my usual serious listening volume unchanged I switched to the test tones, connected my meter to the speaker terminals and played the tones.
On the 0-3vac scale I got a reading of 0.4vac
Doing the arithmetic for my 15 OHM speakers, they only require .085 watts!
Perhaps this is the reason why I'm so in love with my cheap little T2020 chip amp, it's been one of lifes few pleasant surprises.
Terry
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Old 12th November 2012, 06:41 PM   #743
wazzy is offline wazzy  Zimbabwe
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I did the test this evening, played through my studio monitors which are 89dB 4ohms nominal, at a rather loud level I measured 11,6v
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Old 13th November 2012, 12:22 AM   #744
Pano is offline Pano  United States
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Terry, thanks for ding the test. It's surprising, isn't it? I figure you need about 1.25V RMS for you loudest levels, or 1.6V peak. The TA2020 can do that with ease.
Your levels are about in line with my Altec VOTT speakers.

Wazzy, that's loud! Should be over 100dB for the -12 tone. Do you have a really big room, or do you just play very loud in general?
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Old 13th November 2012, 07:02 AM   #745
wazzy is offline wazzy  Zimbabwe
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Hello Pano, yes it was rather loud, to be honest it is not a level that i play at continuously, just some times I like to Feel the music, takes me back to when we used to do live setups. It's not a big room by any means I will post the results of a more sedate listening level a bit later, got to got to work, thanks for an interesting thread.
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Old 13th November 2012, 07:43 PM   #746
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You're welcome. It's good to get data from all sorts of setups and listening styles. Thanks.
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Old 22nd November 2012, 02:11 PM   #747
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Hi Plano,
I first tested a large pair of very efficient vintage 15 Ohm vented enclosure speakers that came out at requiring 0.4v
Yesterday, using the same setup, I connected a pair 3 way, sealed 4 Ohm "bookshelf" speakers and adjusted for my listening level.
The volume needed to be racked up a bit but only tested at requiring 1.2v
What is going on when the poll show some require over 20v? Is it about playing the loudest you speakers go or your normal listening level? Both are mentioned in the testing instructions.
Thanks, Terry
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Old 22nd November 2012, 03:04 PM   #748
AndrewT is online now AndrewT  Scotland
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The loudest listening level when using digital source/s
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regards Andrew T.
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Old 22nd November 2012, 03:45 PM   #749
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Yes, as Andrew says, loudest level you use. You can do a "normal" level, if you also want that reference, but the poll (survey) is for loudest.

Please remember, your peak voltage at the volume setting you used will be 4X higher than the voltage you measure on the tone. The highest RMS voltage will be 2.82X higher than the tone. The difference you measured between the vintage speakers and the bookshelf is almost 10dB. Or 3X the voltage from one to the other. I leave you to figure out the difference in power, if you want.

Thanks for doing the test!
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Old 30th November 2012, 05:39 AM   #750
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Hello Michael,

This is a very interesting post, and forgive me if my questions have already answered in the last 75 pages or so. (just joined the thread)

Several years ago I did a similar test using a 1KHz 0dBFS tone and a SPL meter, but it was uncomfortably loud and thus I didn't replicate it much.
This method is much kinder on the ears.

I was wondering a few things:

a) Is this test affected by whether or not our amplifiers are clipping?
b) Can the test be refined or further developed to figure out "How much power (RMS) do I really need?"

Last edited by tktran303; 30th November 2012 at 06:05 AM.
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