Help with Razer Ripsaw HD capture module!

Hello, I need a little help, Im having a little issue with the capture card.

I set the card as they say on the site of Razer on OBS, putting the audio as they say (HDMI OUTPUT) but the volume is too low and I cant increase the levels normally.

I use OBS filters (Gain filter) to increase the volume, but the audio loses a little effects.

Is there a way to increase the audio in a way more practical?

Thanks in advance.