Greetings Supratim007,
Welcome to the Apple Support Communities!
I understand that the sound coming from your Apple headphones is not as loud as you would expect when connected to your new iPad Air 2. To begin troubleshooting this situation, I would recommend reading over and working through the suggested steps outlined in the attached article below.
If your headset isn't working - Apple Support
You can fix most headset issues with a few steps. Try these first:
- Make sure that the headset has a built-in microphone.
- Unplug the headset and clear any debris from the headset jack. Then plug it back in.
- Make sure the headset is plugged in all the way. If you’re using a case, remove it to make sure it’s not getting in the way.
- Check the headset cable, connector, remote, and earbuds for damage. Make sure they’re not blocked or dirty.
- Try using another headset. If the issue happens with the other headset, contact Apple Support for help. If the other headset works, contact the headset manufacturer.
- Try using a different iOS device with your headset. If the issue happens with the other iOS device, contact the headset manufacturer. For Apple headsets, contact Apple support.
Cheers