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Support Bridged Mono (for larger headphones)


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Many phones (such as my Galaxy S3) are designed to drive relatively small, light earbuds. They also tend to assume that the music has a style with a nearly-constant loudness.

But, for larger headphones (or with less sensitive headphones), and for Classical/Jazz music, this doesn't work well - the music is either too quiet, or too distorted when the gain is turned up.

However, there is a trick which would get far better performances out of the limited amplifier in the phone, namely bridged mono.


1. Process the signal as follows:


left_output =    (left_track + right_track) /  sqrt(2)

right_output =  - left_output



2. re-wire the headphones as follows:


left_ear in parallel with right_ear,  connect to tip and ring, but ignore shield.



The result will be a mono signal to both ears, but where the amplitude is doubled, and thus the power quadrupled. In practice, this will allow more headroom, and prevent distortion when the op-amps would otherwise saturate.


I propose that Poweramp should:


(a) support bridged mono - one more switch in the interface, and make R = - L   rather than  R = L  in normal mono.

(B) document the headphone modification required.


Thanks very much


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