Hi Peng I have heard wonders of this application but I do not know if I will be able to make it work I am somewhat green on this issue so I could never get into dirac live .. by the way to use ratpbsudy it is necessary to measure later with rew, right?
You don't have to if you only use it for tilt the bass up and just trust it will do the job for you, and/or go by ears. Otherwise yes you need to run REW to see the before vs after effects. Before you do anything though, you should save the curve you have now that sounds good to you so that you can always send it back to the AVR if things get messed up.