A Test. How much Voltage (power) do your speakers need? - Page 5 - diyAudio
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View Poll Results: I measured the test tone at:
2 volts or less 141 37.40%
Between 2-5 volts 129 34.22%
Between 5-10 volts 50 13.26%
Between 10-20 volts 21 5.57%
Over 20 volts. 36 9.55%
Voters: 377. You may not vote on this poll

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Old 20th January 2012, 11:26 PM   #41
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Up to, but rather less than 5v for me, easily, with either test tone.

Previous measurements see my average listening level somewhere around the 50-80mV averaged level, using Impulse H2s at an honest 94 -95dB/w I've verified, in a room 6.0 x 4.2 x 2.7m.

Which is about right - my average listening level calculates as 75-80dB SPLmean. I pushed this test tone and metered c.108-110db mean for the 'really, that's rather more than enough' level. I run a pair of nominally 50w amps* which therefore appear sufficient.

Nice test, Pano.

*though >70w actual delivered into this impedance before clipping, 'scope matches calculation.

Last edited by martin clark; 20th January 2012 at 11:29 PM.
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Old 21st January 2012, 02:07 AM   #42
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Quote:
Originally Posted by Pano View Post
Yeah, hard to say and it depends on the tone. I can stand a lot louder tone at 220Hz than at 1000Hz, that's for sure! But I do find that I can play music at a higher average level than most tones, so agree with you. Just hard to say. Do you think that puts you in the 5-10V range, then?
When testing I was running them as part of a 3 way, active, so the bearable SPL was full range. I measured the LF section as it was least efficient and I was curious as to what sort of drive levels I was using then.

If broadband that were to represent the loudest average level, then yes, I'm in the 5-10V range. In reality, most of the time, it would also be somewhat close to a peak level. I don't usually listen loud, but sometimes.....
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Old 21st January 2012, 02:07 AM   #43
Pano is offline Pano  United States
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Thanks for contributing.

Martin. If you measure loud and normal, you'll see how fast the level gets high when you push it. One of the reasons pro rig need so much power.
The circa 80dB mark seems to be where a lot of folks are for serious listening. It may be related to room size, I don't know.
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Old 21st January 2012, 10:46 AM   #44
Mooly is offline Mooly  United Kingdom
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High Pano, great thread

OK then here we go. Music used, Beethoven Symphony No.5 1st and 4th movement on SACD. Really turned it up for this.

A sound level meter with 10 ms response time at the listening position showed between 82 and 87 dbc.

Using your 220 hz test I measured 5 volts RMS (AVO 8) across the speakers (B&W 703)
The sound level meter showed 98dbc during this test.

What is interesting is how you can easily hear the room exitation and cancellation points. At some points in the room you can almost null the tone out by careful head positioning.
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Old 21st January 2012, 11:16 AM   #45
AndrewT is offline AndrewT  Scotland
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I wonder what the two Members who both measured over 20Vac are driving?

Did they forget to tell us they have 100V lines installed?
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Old 21st January 2012, 11:47 AM   #46
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I've set the volume at the max level I can support on the rock (actualy AC/DC back in black), on the classical/light jazz I can go much higher, it depend realy on the music played.


So using the AC/DC setting I've measured a bit less than 0.6V playing your 120Hz-12dB.mp3
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Old 21st January 2012, 12:02 PM   #47
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Hi pano great tread IMO as well.

Managed to run test
120 Hz =4.6437V
220 HZ = 4.69

On Meterx3282 DM
This at the volume setting I normaly use if Nigbours are out and she is gone shopping.

I am using a Pair of Polk LSi15 with My F5
From this I am looking at peaks of around 19 V
How this vould relate to suply rails at +26 -26 V on the F5 ?
How much head room I got rougly?

Briliant tread

Last edited by Bksabath; 21st January 2012 at 12:09 PM.
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Old 21st January 2012, 02:59 PM   #48
Pano is offline Pano  United States
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Thanks Mooly and Vladimir. You have seen the old rule that classical music needs a bigger amp. Why? Because it's recorded at a lower average level than most other music, but the peaks still go all the way up. To play that lower recorded level up were you want it, and not clip the peaks, you need a ton of headroom.

Heavy Rock has always been recorded with a high average level, very little dynamic range. You won't need a lot of headroom, but you will need an amp with a good power supply to keep rocking along at that level all the time.

@Bksabath. Interesting that your measurements were so close at the two frequencies. Either a nice flat impedance curve, a low output impedance amp, or both. But you mention an F5.

As for your headroom, I don't know at what voltage the F5 clips, but I'm sure someone here does. You have about 2dB I think. That doesn't leave you a lot, but you might not notice. Amps with benign clipping behavior don't sound bad if you clip a few peaks. More than a few, actually.

Thanks for taking part in the survey, guys.
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Old 21st January 2012, 03:06 PM   #49
Pano is offline Pano  United States
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Vladimir. I took a look at the title track from Back in Black. It's pretty loud all the time, but not as bad as I thought. Thru most of the song the average level is -13dB. It's not nearly as squashed as many modern recordings. See graph below.
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Old 21st January 2012, 04:24 PM   #50
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The 2 who got over 20 must be pranksters. They were there right near the beginning. And nobody since has added to it. And nobody is 10 to 20. Or they didn't do the test and assumed they need huge power.
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