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Rockbox Ports are now being developed for various digital audio players!

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Author Topic: Optimum playback settings - one for the programmers?  (Read 1695 times)

Offline lostcause

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Optimum playback settings - one for the programmers?
« on: January 25, 2011, 07:34:58 AM »
Hi guy's, I expect this may have been asked before but I can't seem to find my specific question, sorry if it has.
I have an iPod 5.5 80GB which I i-modded so that I have direct outputs from the DAC pins LOUT2 & ROUT2.

I send this analogue stream direct to my amp so that I don't alter/mix the sound in any way. Volume is adjusted at the amp.

What I'm wondering is if the Rockbox default settings are optimal for this application?

Also, should I be using LOUT2 & ROUT2? or should I use another output?
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Offline [Saint]

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Re: Optimum playback settings - one for the programmers?
« Reply #1 on: January 25, 2011, 07:34:44 PM »
If you're just using LOUT or ROUT singularly...won't you have monaural output?

Sounds to me like you want to be using both of them, not either or...unless they are really stupidly/confusingly named.



[St.]
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Offline lostcause

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Re: Optimum playback settings - one for the programmers?
« Reply #2 on: January 26, 2011, 03:00:41 AM »
I'm using both LOUT2 & ROUT2 of the DAC pins with AGND for the Stereo signal. ;)
The signal is (I believe) unmixed or affected by the digital volume circuits. No DSP as far as I can tell.
The thing is that there are also 'other' outputs and how the programming affects their outputs.
See the schematic and pinout to see what I mean.
http://picasaweb.google.com/lh/photo/O357XyClnPwOfPGYs2liVw?feat=directlink

http://picasaweb.google.com/lh/photo/TFT3TAODVwf9ZEb7akW_3g?feat=directlink
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Offline Buschel

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Re: Optimum playback settings - one for the programmers?
« Reply #3 on: January 26, 2011, 11:22:39 AM »
LOUT2 and ROUT2 are affected if you lower the headphone volume below -56 dB. Beyond this the lineout level is lowered in parallel to the headphones. At -56 dB or above the lineout is not impacted.
The rockbox default settings do not enable any bass/treble/sound management on either the Woflson codec or on the CPU side.
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iPod 5.5G 30GB, iPod nano 2G 8GB, 97% MPC and growing...
 

Offline lostcause

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Re: Optimum playback settings - one for the programmers?
« Reply #4 on: January 27, 2011, 12:43:08 PM »
Now that's exactly what I wanted to hear, thanks for the insight Buschel.
I had no idea that they influenced each other like that.

Cheers
Lee
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Offline soap

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Re: Optimum playback settings - one for the programmers?
« Reply #5 on: January 27, 2011, 01:26:55 PM »
Only in Rockbox (to the best of our knowledge) is this combo effort made to lower the volume beyond -56dB.

Mind that EQ, Replaygain, crossfeed, crossfade, etc. will affect the line out.
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