I was under the impression that a voltage level increase of 6db is roughly
2x, and 20db is bang on 10x. Either way it's definetly a logarithmic measure.
In terms of the power involved, given constant resistance/impedance, that is
the square of the voltage, or in dB terms +3dB is twice the power and +10dB
ten times.
So an 18-bit DAC has a theoretical resolution of 262,144 steps thus the 108dB
dynamic range (200,000 steps being roughly 106dB).
I think what Nathan / "the Rodent" said about a ten-fold power increase (10dB)
being needed to make something sound twice as loud may well be true. The
booklet from a fairly well-respected speaker manufacturer (Wharfedale).agrees.
Anyone know anything about this.
Further tests show when my Akai amps' thermal cut-out tripped, I was probably
averaging aroung 50W RMS with peaks of near 200W RMS-- which might have
clipped or might not by my amp.The AC reading on my meter with music was
half that of a 1KHz test-sig under the same conditions. I guess that explains
the Akai getting all hot and bothered.
Cheers,
PrinceGaz -- "if it harms none, do what you will"
Email: [EMAIL PROTECTED]
Website: http://website.lineone.net/~princegaz/
ICQ: 36892193
------------------------
From: David W. Tamkin <[EMAIL PROTECTED]>
> S.S. Rat wrote:
> | More directly useful to
> | you, doubling volume (energy) is 10dB, so a 20dB sound is twice as loud as
> | a 10dB sound, and a 110dB sound is twice as loud as a 100dB sound.
>
> That doesn't sound right.
>
> An increase of 10 dB means ten times as much energy. Doubling the energy
> would be an increase of 10*log(2) [common log, base 10, that is], or about
> 3.01 dB. 20 dB has ten times the energy reaching the sensor (or ear) as
> 10 dB. And I guess even at that we should say "power" rather than "energy".
>
> As to doubling the volume, that's subjective, isn't it? "Twice as loud" is
> a lot like "twice as dark" or "twice as happy."
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