Going on original instructions - its been a while since I looked over here.
With the -18db sounding like Niagra I hit 152.3 millivolts. So 0.4v rms 😕
I need to go back to school
With the -18db sounding like Niagra I hit 152.3 millivolts. So 0.4v rms 😕
I need to go back to school
OK, sounding like Niagra? You were using the pink noise? Please try the -12dB sine wave files. Pick the frequency that works best for your system.
Just to give folks an idea of how hard it is to power new ortho headphones, I measured 1.3Vrms with the -12db tracks, thats higher than the majority of speakers meaurements in the poll.
Don't forget that headphones usually have higher impedances.
Therefore 1.2V into 60 ohms (audeze LCD2) is 0.024 watts.
Its the same as 0.44V into 8 ohms. 😱
But still, it's a lot of power for headphones (remember you are listening centimeters away, not meters like with speakers). 😱
Dear Pano
thanks for the post, I'll take the test asap. I am struggling with the "gain staging" problem.... I never thought about it before I strated to play with active xover!. It's damn important, I realize!
I have the following basic question which has somehow to do with gain-staging and this voltage test all together.
Suppose my speaker have:
Z_min = min impedance across the spectrum,
S = speaker sensitivity in dB/2.83V/1m, anechoic
I want to produce X dB at the Y meters under anechoic conditions. How do I compute:
1. Vmax = the voltage required by the amp
2. Imax = the current need
I hope somebody can give me forumlae to compute those quantities.
Best Regards
Pierre
Ps: I may try to answer that answer that Imax=Vmax/Zmin,
thanks for the post, I'll take the test asap. I am struggling with the "gain staging" problem.... I never thought about it before I strated to play with active xover!. It's damn important, I realize!
I have the following basic question which has somehow to do with gain-staging and this voltage test all together.
Suppose my speaker have:
Z_min = min impedance across the spectrum,
S = speaker sensitivity in dB/2.83V/1m, anechoic
I want to produce X dB at the Y meters under anechoic conditions. How do I compute:
1. Vmax = the voltage required by the amp
2. Imax = the current need
I hope somebody can give me forumlae to compute those quantities.
Best Regards
Pierre
Ps: I may try to answer that answer that Imax=Vmax/Zmin,
Pierre,
Voltage x Voltage divided by impedance=watts.
SPL drops at 6 dB per doubling of distance outdoors or in an an anechoic chamber.
A 90 dB one watt one meter speaker driven with 10 watts will be 100 dB, at 2 meters 94 dB, at 4 meters, 88 dB etc.
Assuming a nominal 8 ohm speaker, the 10 watts would require 8.944 volts.
And as mentioned, that is outdoors or with no reflections. It usually does not drop what fast in a room. If you are in a room, I suggest pink noise playing on both speakers and an SPL meter.
For example: With both speakers playing I get ~84dB at my listening position with 1V on the speaker terminals. I'm not sure what that translates into for each speaker a 1W/1M, but I know the voltage I need to hit 84dB where I sit. 🙂
For example: With both speakers playing I get ~84dB at my listening position with 1V on the speaker terminals. I'm not sure what that translates into for each speaker a 1W/1M, but I know the voltage I need to hit 84dB where I sit. 🙂
Speaking of headphones, for my nominal 25 ohm Denon D7000's I measured 0.336v using Pano's -12dB test tone.
This method won't determine sudden changes in signal amplitude? If I'm watching a movie like Master and Commander, Chapter 4, before the cannons start, there is almost silence but when the action hits it hits very hard.
Now how would one determine how much voltage was used during those sequences? Because people say you need "x" watts to watch a movie and that more power will help in a given scene.
It would be interesting to put that to the test to test dynamic events from movies at a loud volume and see how much power is being used.
Now how would one determine how much voltage was used during those sequences? Because people say you need "x" watts to watch a movie and that more power will help in a given scene.
It would be interesting to put that to the test to test dynamic events from movies at a loud volume and see how much power is being used.
it would be just the same thing done in this thread.
are you sure you read and understood the procedure?
nevertheless, everyone is free to believe that there are occult/unmeasurable phenomena at play.
But doesn't the procedure use test tones? I'm referring to a dynamic scenes in a movie. I definitely don't believe in occult/unmeasurable phenomena. I believe it's all measurable, but I guess I want to know what the best method would be to test how much power is being used while watching a movies dynamic scenes.
Like the Star Wars Attack of Clones, beginning sequence where the ship flies by and then explodes. Incredibly dynamic, but I would to know how much power is being used up at a given volume. I'm all for learning.
Like the Star Wars Attack of Clones, beginning sequence where the ship flies by and then explodes. Incredibly dynamic, but I would to know how much power is being used up at a given volume. I'm all for learning.
this test gives you exactly that, the worst-case figure. why do you not believe it is correct?
if what you mean is that you'd rather be using different listening levels for movies, then just use your favorite "loud" movie instead of music to set the normal listening level.
or...?
if what you mean is that you'd rather be using different listening levels for movies, then just use your favorite "loud" movie instead of music to set the normal listening level.
or...?
I don't know. I don't know if test tones are the equivalent of a dynamic signal, like a movie. I thought test tones were steady state.
If a movie has a scene recorded very loud at a high MV, you are saying that using test tones is going to give the same result if using the MV at the same volume?
If a movie has a scene recorded very loud at a high MV, you are saying that using test tones is going to give the same result if using the MV at the same volume?
so, are we doing the "I don't know why but it is wrong" game again? thought we were over that.
what is a MV?
I am saying that Pano's test will give you the worst-case voltage swing, which will translate to a power figure, all required things (like speaker impedance) considered.
what is a MV?
I am saying that Pano's test will give you the worst-case voltage swing, which will translate to a power figure, all required things (like speaker impedance) considered.
Pano's procedure is correct.
However the feature of peak-volt-meter provided by some multimeters can, in the most simple manner, tell the same things and much more during a listening session : maximal voltage across each driver, maximal current in it.
[QUOTE="mr_push_pull]o, are we doing the "I don't know why but it is wrong" game again? thought we were over that.[/QUOTE]
Sorry I didn't know there was a problem. I haven't read through this thread. I just thought about it for a second and asked you a question. No need to get defensive.
Sorry I didn't know there was a problem. I haven't read through this thread. I just thought about it for a second and asked you a question. No need to get defensive.
Sorry, just another question. Let's say I determine what the peak voltage levels are at my maximum preferred listening level. What if I decided to use bass management and set speakers to Small? How would that affect the readings?
How does one get the test tones on to the video disc as an accompaying sound track?
That way we can compare the maximum output of the CDP with the DVP sound track.
I would expect the DVD used as a CDP would give the same result,
But would a video sound track give the same maximum output as the DVD used as a CDP? There could be a difference since the coding will be very different.
That way we can compare the maximum output of the CDP with the DVP sound track.
I would expect the DVD used as a CDP would give the same result,
But would a video sound track give the same maximum output as the DVD used as a CDP? There could be a difference since the coding will be very different.
Hi Vaughan
These are good questions and I will try to answer them as soon as possible. I'm traveling at the moment.
These are good questions and I will try to answer them as soon as possible. I'm traveling at the moment.
How does one get the test tones on to the video disc as an accompanying sound track?
That way we can compare the maximum output of the CDP with test tones on a CD with the DVD where the tones are on a video sound track.
I would expect the DVD used as a CDP would give the same result, as when a CD is played on that DVD player.
Would a video sound track give the same maximum sound output as the DVD used as a CDP in playing a CD? There could be a difference since the coding will be very different.
That way we can compare the maximum output of the CDP with test tones on a CD with the DVD where the tones are on a video sound track.
I would expect the DVD used as a CDP would give the same result, as when a CD is played on that DVD player.
Would a video sound track give the same maximum sound output as the DVD used as a CDP in playing a CD? There could be a difference since the coding will be very different.