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#10505 - 04/29/03 08:25 PM Re: Yamaha db Display
Saturn Offline
connoisseur

Registered: 10/21/02
Posts: 1041
Loc: Toronto Ontario Canuck
Do you guys know if reference level is 70db or is it relative to each receiver.
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#10506 - 04/29/03 08:36 PM Re: Yamaha db Display
Semi_On Offline
aficionado

Registered: 09/18/02
Posts: 737
Loc: Scottsdale, Arizona
Sushi,

That's what I figured. I've seen similar setups with other, significantly more expensive manufacturers. It's definitely a cool technology.

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#10507 - 04/29/03 08:37 PM Re: Yamaha db Display
chesseroo Offline
connoisseur

Registered: 05/13/02
Posts: 4827
Loc: western canada
My onkyo goes both ways.
It does the dB scale from about -60 to +10 i think and it uses a straight 0-100 scale as well.
Absolute and refernce scales i think they are called. Something like that.
On the 0-100 scale my reference level is marked at 82 when the volume screen reads 81, REF, 83....
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#10508 - 04/30/03 11:04 AM Re: Yamaha db Display
amer Offline
old hand

Registered: 10/22/02
Posts: 85
Loc: Calgary, Canada.
The new HK receivers have a similar functionality, its called EZsetup, and the microphone is actually in the remote control.

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#10509 - 04/30/03 11:42 AM Re: Yamaha db Display
alan Offline
connoisseur

Registered: 01/29/02
Posts: 3187
Loc: Toronto/New York/Dwight
Hi Amer, Avian, Chess et al,

Notwithstanding the Pioneer and H/K attempts to establish some kind of reference level, I do find this "calibration" of the front-panel readouts rather arbitrary and, for many users, counter-intuitive.

It stems from audio broadcasting standards, where "0 VU" on a standard VU (Volume Unit) meter on the control-room console actually was a standard calibrated level, so feeds from studios in different cities or locations would always be at the same level.

Above that 0-dB level, +3 dB indicated a distortion level of 1%, if memory serves.

But unless you clearly understand the logarithmic relationship of the decibel, it's confusing for consumer use.

By the way, amer, in acoustic sound pressure levels (SPL), it requires a 10-dB increase in sound levels to subjectively "double' the apparent volume. This requires an electrical increase of ten times. If a speaker needed 5 watts to produce a sound level of 90 dB SPL at 1 metre, and you wanted to subjectively double the volume, you'd need to supply 50 watts to the speaker to increase its acoustic output to 100 dB SPL. That's why slight differences in the rated power output of an amplifier really aren't very meaningful.

Regards,
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#10510 - 05/05/03 05:50 PM Re: Yamaha db Display
nacho123 Offline
newbie

Registered: 05/01/03
Posts: 3
Hi, this may or may not be the same as my Panasonic SA-HE70. Its volume also counts down from 99 to 0. Never having come across this before I emailed Panasonic customer service and got a reply back next day.

Being a mechanical engineer I know about decibels as a measurment of sound, but it turns out that decibels are widely used in electronics as well. It is simply a logrithmic scale describing a ratio for power, voltage etc.

Panasonic says in the case of my reciever it measures the decrease in resistance. The result is much finer control at lower listening levels where it doesn't take much power make a large change in sound level.

I would email Yamaha to get the official scoop.



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