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Are you use player with rockbox with loudspeakers (in car/home stereo/etc)?

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Mihail Zenkov:
I want add new feature to rockbox (it can help to improve sound quality when player used with loudspeakers) and just curious how many people use loudspeakers with rockbox.

johnb:
Hi Mihail,

I mostly use my Sansas with headphones (for some with amp NX-1).

I have created two cfg files:
Line-out with headphones+amp: volume:0, crossfeed:meier, replaygain
Line-out with speakers (rather home stereo): same as above, but crossfeed off.

What improvements or special settings are you thinking of?

Mihail Zenkov:
I use DRC (https://en.wikipedia.org/wiki/Digital_room_correction) in car and home - just fantastic sound improvement. But it quite hard in usage, especially for ordinary users, so I want integrate it in rockbox and make it user friendly. I still not sure is it possible, but I want to try.

saratoga:
There are people on headfi trying similar things using the eq in rockbox to flatten out the response of headphones, so it could work for anything.

I always thought about making a plugin to help measure the response and create eq curves (or impulse responses). I never had time though.

Mihail Zenkov:

--- Quote from: saratoga on April 09, 2016, 12:46:39 PM ---There are people on headfi trying similar things using the eq in rockbox to flatten out the response of headphones, so it could work for anything.

--- End quote ---

Not exactly. Basic EQ breakup phase. DRC linearize phase.
For real room (and especially for car) correction we also want eliminate strong early reflection (http://www.readyacoustics.com/early-reflections-explained.html?chapter=0 ).

So we need FIR (and fast CPU for it).

EDIT: Also correction should be done separately for left and right channels.

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