A Test. How much Voltage (power) do your speakers need? - Page 7 - diyAudio
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View Poll Results: I measured the test tone at:
2 volts or less 144 37.40%
Between 2-5 volts 130 33.77%
Between 5-10 volts 51 13.25%
Between 10-20 volts 24 6.23%
Over 20 volts. 36 9.35%
Voters: 385. You may not vote on this poll

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Old 22nd January 2012, 06:27 PM   #61
Pano is offline Pano  United States
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Sorry Jerome, I don't understand what you mean.
Quote:
Originally Posted by jerome69 View Post
No problem for my amp, 500W of power behind them, 50W/8ohms --> 100W/4ohms
To me, an amp that is rated 50WPC @8 ohms means that it can deliver 20V RMS on a sine wave before clipping. That would be 28.3V peak. It won't deliver more voltage into a 4 ohm load, it will be the same, or maybe a little less.

Your measurement of 12.6V RMS on the -12dB tone means that you need 4X 12.6V for the peaks. Or just over 50 volts. It seems to me that you would need to bring your average level down by 6dB to avoid clipping. No?
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Old 22nd January 2012, 07:14 PM   #62
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Yes you are right.
It is my own amp, +-35V voltage. The voltage doesn't change but the power yes, and my amp can supply this power : 100W/4ohms.

My music is not at 0dB level ! I put my favorite music at maximum level i can listen to it and after i measured the test tone. I think it is the explanation of this difference, unless i didn't understand the procedure .

Ok i reach the limit of my amp, the result should be 7V (6db less) ?
BTW the OB could provide (80 + 20) 100dB SPL
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Old 22nd January 2012, 07:31 PM   #63
jtalden is offline jtalden  United States
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I voted as 5-10 V

I normally listen to contemporary music at about 4.5 V but sometimes go 2 or 3 dB louder. I listen to Classical at higher settings, with the highest setting corresponding to 13 V. This is at my limit and rarely done.
DIY Speakers - SEAS ER18RNX (6.5”) 8 Ohm Mid-Woofer [Characteristic Sensitivity 88.5 dB (2.83V, 1m)]
240 Hz test signal was used as the XO to SWs is at 100 Hz and there is EQ boost impacting 120 Hz range.
210 m^3 (7400 ft^3) room with LP at 4 m.
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Old 22nd January 2012, 07:52 PM   #64
Pano is offline Pano  United States
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Thanks JT. That's a nice big room with average sensitivity speakers, very nice to know. Your contemporary vs classical also seems right in line. Classical recording can be very dynamic. In your case about 9dB more dynamic.

Quote:
Originally Posted by jerome69 View Post
I think it is the explanation of this difference, unless i didn't understand the procedure
Maybe. Let me see if I can explain again.

When you measure the -12dB test tone, music peaks will be 12dB (4X) higher when playing at that same volume setting. That's how digital recordings work. -12dB will always be 1/4 the voltage of 0dB. 0dB is is the highest possible level.

Now; you could set your volume to its "normal" setting and measure there, but that would not tell you how much voltage you need to play it loud. As loud as you ever do. We are looking for the most you ever use.

I choose -12dB for several reasons, one being that it isn't likely to blast out your ears or speakers, and not make the neighbors call the cops.
Another reason is because it's easy to do the 4X multiplication in your head to know the absolute peak voltage.
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Old 22nd January 2012, 07:59 PM   #65
KSTR is offline KSTR  Germany
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I measured 1.9Vrms with the 220Hz test tone, after listening to some songs with my typical levels which I consider moderate, at 80...90dB averages on a C-weighted meter, slow setting. The test tone read 92dBC at the listening position.
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Old 22nd January 2012, 08:03 PM   #66
Pano is offline Pano  United States
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Thanks!

So at your normal levels you might be hitting 104dB peaks?
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Old 22nd January 2012, 08:08 PM   #67
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The most level i ever use, (knob 8h45) is easy to measure : 1.5V RMS 9W 89.5dBSPL.

But sometimes I play loud (1h10) seems to be the overall power of the amp.
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Old 22nd January 2012, 08:20 PM   #68
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I measured ~3.05 volts with receiver @0dB (movie reference setup by Audigy on Denon 3808)

Home built RD75 open baffle w/woofers, no subs @120 Hz

This in a 25' x 40' x 2 story room with lots of furniture. At 15', the spl measures ~ 82 - 85 dB, depending on room modes.

They'll go alot louder, but wife is home...
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Last edited by auplater; 22nd January 2012 at 08:24 PM.
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Old 22nd January 2012, 08:27 PM   #69
Pano is offline Pano  United States
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Thanks. You've posted photos of your speaker on the forum, right?
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Old 22nd January 2012, 08:41 PM   #70
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120Hz 3.76V
220Hz 3.53V
Loud enough and comfortable with well recorded material.

12.15V, 11.6V at the end of the party around 5am (death metal records)

My weak NAD amp is capable of 40V or so. Speakers: Gedlee Nathans
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Last edited by MethMan; 22nd January 2012 at 08:44 PM. Reason: speakers added
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