For the GD setup we initially had it running in the front left corner so it was flanked by the concrete floor and 2 concrete walls. We disconnected the Pb13 and ran Audyssey for 80hz crossover and the GD running 4db or so hot. In this position the Star Trek warp drives had plenty of low rumble but not enough mid to upper bass slam. So we moved GD further right - it ended up being the center channel stand. The upper bass slam for the same scene was much better in this position. The GD remained in this position for now as you see in the photos.
We ran thru Open Range, WOTW and Blue Man Group DVD-A with GD in the center. We ran the demos from -4db to reference levels depending on the movie. WOTW at about -2db was extremely tactile and house shaking. According to Jeff the GD was cruising and we didnt get anywhere near its limits. In this position earlier the Pb13 was relatively mute - no where near this powerful or impactful.
With the GD the room became an issue at this point. I have about 10 GIK Acoustics panels along the front and left walls - no bass traps. We could literally hear the left wall and right wall as well as the panels vibrating - especially on some types of music with clean and deep bass hits. Jeff recommended I build some bass traps in the corners of the HT.
To see if the Pb13 can tame some of this we ran the it with the GD in the front center and Pb13 behind the front row and a crossover of 40Hz for the Pb13. We then moved Pb13 to the middle of the left wall (as shown in the photos) - this helped clean up the bass a bit. By then we were at about midnight and we couldnt run the subs at full tilt so we stopped. I will bring out my REW and look at the FR - Jeff will drop by when he has some time with his TEF.
I went thru a number of subs - starting from an 8in to SVS PB10 to SVS PB12+2 to the Pb13. At one time I ran the Pb12+2 and Pb13 together in my previous house. That HT was also in the basement which was also open but smaller than my current basement. At no time did I get the impact like I did with the GD. Over the last 2 yrs I got tired of running the bass demo scenes! So I didnt watch Open Range or WOTW in a while - it was quite an experience running those scenes again and the impact with the GD alone was much more than previous subs. The sub was just cruising along during the high volume levels.
Is the last pic to show the GD drank all your beer?
The GD drank all my beer and still wanted more!
Judging by your description with the PB13 being nearfield behind the firest row of seats was it disconnected for your tests with the GD? Also what were your xover points for the 888s and the GD?
See above explanation. We did run with Pb13 connected later on but didnt run the subs at ref levels. I will try to integrate the two and see how it works out.