RAW HM 1000x loudness VS HM 1000

I am trying to narrow down which RAW gun to get. Part of my evaluation is loudness. Since the X model is a higher powered gun, Is the noise a lot louder. I want a gun to be backyard friendly, but at the same time I may want to have the extra power available for " long range" shooting. Any body had a side by side comparison?
 
I'm thinking the main difference between the HM1000 and HM1000x is the larger pre chamber on the x allowing a larger reservoir of regulated air available for the shot. If your HM100x is tuned for high power it will be louder than the lower power available on the HM1000. If you tune down the HM1000x to match the power of the HM1000 they will probably have equal discharge noise. This is assuming barrel/suppressor dimensions are equal. 
I have just ordered a HM1000 in .22 because I can get my target velocity of 875 fps and save $275. If you think you will need more power than the HM1000 can provide you should get the x model. Especially if you go with a .25. 
Why don't you call Martin and see what he thinks?