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Subject: RE: Optimum Audio Levels
From: Matt Evans (mge_at_blueyonder.co.uk)
Date: 2004-06-03


Sorry to contribute late. Headphones as low as 45% when going to sleep. (I
couldn't use the original Archos at all for this purpose because the volume
didn't go low enough!!).
Matt

-----Original Message-----
From: rockbox-bounces_at_cool.haxx.se [mailto:rockbox-bounces_at_cool.haxx.se] On
Behalf Of Benjamin Betts
Sent: 03 June 2004 02:27
To: Rockbox development
Subject: Re: Optimum Audio Levels

Headphones: 60 - 70 %
Car and Stereo: 85% - 95%

Benjamin Betts
bmbetts_at_mail.uophx.edu
benbetts_at_charter.net

BlueChip wrote:

> Hey all,
>
> I need to do a little survey to optimise the new Audio Interface...
>
> One question :)
>
> ============================================
> What is the VOLUME range you use most often?
> ============================================
>
> ...If you use, say, one volume in the car, and another in bed at night.
> Feel free to give two answers.
>
> Personally I use:
> 85-95% in walkman mode
> 65-75% in bed
> 92% in the car
>
>
>
>
> Skip to the "P.S." section now!
> ...unless you want all the techies-only stuff.
>
>
>
>
> The volume scale inside the unit is measured in dB on the scale {MUTE,
> -114, -113, ..., -2, 1, 0, +1, +2, ..., +11, +12} Where 0dB is
> designed to produce "Line Level"
>
> These values are numbered {0x00, ..., 0x7F} respectively Such that
> {0=Mute, 1=-115dB, ..., 0x73=0dB, ..., 0x7F=+12dB}
>
> The Rockbox volume scale is a linear transpose of the MAS scale.
> That is: Actual_Volume = Rockbox_Volume*0x7F/100
>
> ...which interestingly enough means there is no Rockbox setting for
> line level and you do not have fine control where required.
>
> I have a non-linear scaling algorithm which allows greater control in
> the most used volume ranges at the cost of less control in the unused
> volume ranges.
>
> At Rockbox=60%, you are down to 0x4C which is -39dB
>
> I currently have FULL control over -18..+12dB but I think others,
> particularly the audiophiles, may require accurate control at lower
> levels.
>
> B
> l
> u
> BlueChip
> C
> h
> i
> p
>
> PS. Good news: I just found the MAS registers to turn your Jukebox
> into a mixer and/or karaoke machine - so your jukebox can remove the
> old vocals and add your in place, live and with a simple mixer :)
>
> There's even an option for "3.0" sound if anyone is interested in even
> more volume - lol
>
> _______________________________________________
> http://cool.haxx.se/mailman/listinfo/rockbox
>
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