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rockbox equalizer affects usb sound output for ipod?

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Llorean:
The line-out volume is equivalent to 0db in Rockbox. This is "At the level in the file, no louder no softer" essentially. If you go up from there, there is a change of clipping. If you go down from there, you don't have the full range. This is called "line level" and is what the line out is presented with.

But if you add any digital gain adjustments (equalizer, replaygain) this happen before the analog gain adjustment (which is where volume control comes in, or in the case of the line out, where it doesn't.) Whether you hear clipping or not, things with a true "line-in" expect line-level audio, and that's what comes from the line-out.

The other difference of a line out is that it's not designed to drive headphones, which have a much greater resistance than a line in, so the perceived volume with headphones may be different from what you'd expect to get from the actual gain level.

At least, this is if I understand the concepts correctly, and haven't completely screwed up my explanation (both of which are at least semi-decent possibilities).

yegods:
thanks for the explanation!  i'll be playing with the replay gain pre-amp settings to see if i can get the car volume to be reasonable, without totally clipping my songs.

Febs:
How are you connecting to your car stereo?  Check the manual for your stereo, as there may be a way to adjust the input gain of the input that you are using.

yegods:

--- Quote ---How are you connecting to your car stereo?  Check the manual for your stereo, as there may be a way to adjust the input gain of the input that you are using.
--- End quote ---

i'm using a FM transmitter, and it doesn't seems to have any settings like that.  i'll be changing over to a standard stereo input soon, hopefully that will make a difference.

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