Third Party > Repairing and Upgrading Rockbox Capable Players

ipod video with DC Coupled headphone output

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soap:

--- Quote from: Chronon on December 06, 2009, 03:02:22 PM ---Alternatively, if you're cracking the case you could replace (or simply augment) the capacitors.

--- End quote ---

Not enough room in any of the cases for any of the capacitors I've seen proposed for fixing the bass roll-off @ 16 ohms.


--- Quote from: strider on November 27, 2009, 11:21:09 AM ---1) remake wm8758 driver
and recompile firmware

--- End quote ---

Please explain this part to the noob here (me!), what needs changed in the audio driver?

Multiplex:

--- Quote from: soap on December 09, 2009, 06:47:27 AM ---Please explain this part to the noob here (me!), what needs changed in the audio driver?

--- End quote ---
There was this post a little while ago http://forums.rockbox.org/index.php?topic=23221.0

Chronon:

--- Quote from: soap on December 09, 2009, 06:47:27 AM ---Not enough room in any of the cases for any of the capacitors I've seen proposed for fixing the bass roll-off @ 16 ohms.


--- End quote ---
I see.  I haven't checked to see how much extra capacitance is needed and how much space this would typically require. 

NiHaoMike:
Just add about 100 ohms of resistance in series with each channel to push down the RC corner frequency. I did that by modifying my headphones, although it can also be done by modifying the player or by making an adapter. In my case, the JVC HA-FX34 has a stock impedance of about 16 ohms, so the mod puts them up to 116 ohms. Some volume is lost but the iPod can still play much louder than I want.

Another benefit is that variations in headphone impedance over frequency will be reduced, smoothing your frequency response.

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