Earpiece volume too soft on Xphone

[Guest veronmodaco]

The earpiece volume using O2 ROM 1.10.18.8 is

1. Loud but not clear as the sound tend to pickup high pitch and amplify

2. Clarity is good but the is no bass to the sound.

The earpiece volume using O2 ROM 1.10.18.6 is

1. Soft and clear, does not pickup high pitch and amplify

2. Clarity is good but the is no bass to the sound

I have also use latest Orange ROM 2.7.5.1 but the earpiece is also too soft like O2 ROM 1.10.18.6.

Anyway to make the earpiece louder??