got my great gramma for my 22-31 pci yesterday from sweetwater. great company btw, quick shipping. 5 days from indiana (i believe) to socal. ordered on monday had it by friday in time to check out the pre-release dvd of apocalypto- great movie.
couple notes on the great gramma: it is long obviously. but, IMO thats a good thing as there is more absorption materials underneath. i tucked the gramma and butted it right into the corner and then put my sub almost at the end of it- further along the wall away from the corner about 2 feet. i didn't put it all the way at the end of the gramma as i was afraid it may tip it due to the length of the great gramma. i left about 4- 6" on the end.
i felt tucking the gramma into the corner would lower the resonating of the corner there. the extra length was handy for that. it also looks like a DIY like we spoke of earlier is not as simple as just the platfoam and mdf. i mean it isn't rocket science but, it does have some of that purple corner or bass trap material under it as well, so that may bump up the price of a DIY project. all in all IMO a longer gramma means more absorption which made sense to me plus a little more room to play with placement of the sub without having to lift the sub and the gramma- within reason of course.
so after getting it in place. i DID notice a definite difference immediately with a quick test of some garbage bass heavy gangsta movie on HBO HD. while watching apocalypto for my full evaluation (which has some pretty heavy bass parts), after checking the spl calibration, i noticed a BIG decrease in floor resonance and corner boom. there was some floor resonance in some REALLY deep parts of the soundtrack but, i would say they were reduced by about 80%. i would say the corner boom was reduced by the same. i still felt the bass but more in the chest kind of thing rather than through the floor. much cleaner, and even though i had the volume turned up fairly loud i didn't get the usual "GOD ISN'T IT A LITTLE LOUD" complaints that i used to get from the other 1/2on the bass heavy parts- which was nice. my floor is berber carpet over plywood over concrete. as far as WAF i didn't tell her i ordered it, and she still doesn't even know it's there. but, i do have my svs cylinder in that corner behind a chair. which sort of conceals it but, you can see one end of it.
so all in all i think it was a nice little investment. i don't think it will take the place of proper room treatments. but, we don't all have the option of doing that right now do we? i also think coupled with an EQ like the BFD for $99 as well- which i will be picking up here in the next few weeks- it can really help taming some issues and make things much better.
my 2 cents...