Hello rganeshshenoy,
Thank you for the question.
As I understand with the Onkyo receivers, you may have to adjust the center channel audio higher than the front left and right channels. This might take some time in tweaking the front 3 speakers within the Onkyo receiver until it sounds correct to your listening habits. This might be best handled on the Onkyo forum which can be found HERE.
Let us know if you have any other questions.
Warm Regards,
Joel - Community Support