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Hi there, the ProSound modification does not make the Game Boy lose volume, take for example these readings from the blog post you link to:
GBC Headphone Socket
Silence: -57.6 dBfs
Music: -15.9 dBfs

GBC ProSound Socket
Silence: -65.7 dBfs
Music: -2.2 dBfs

You can see that the music of the ProSound Game Boy color is actually around 13dB louder than before the mod was done. (keeping in mind that 0dBfs is a reference to the maximum amplitude in a digital system, and dBfs is thus almost always negative in reference to this level).

However, there is not enough ENERGY left in the output to run headphones very loudly.

Kind regards.

Posted by: Collin Cunningham on June 26, 2008 at 11:33 PM

Aah, seems I overlooked the negative sign - I'll update accordingly.

Thanks for the correction!

Hey, no problems
:-)

Posted by: vivi on June 27, 2008 at 11:24 AM

Higher levels, but less power which makes the "prosound" output unsuitable to speakers or headphones.

Makes me wonder if the output amplifier and power supply filtering could be replaced by better ones. This would enable to use headphones with the better sound.

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