Using headset other than stock, effected volume for stock headset?

I had a great walkman experience with my Xperia Z using headset that come with it brand new.

After i used some other headset and realized it later that the volume is now too low while using stock headset. can it be fixed? what're my options? i really love xperia Z but now feel disposable

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volume, using headset other than stock works fine but on stock it's still too low. got to fix it without compromising it's water resistant feature.

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