Okay I didn't get chance to do half the things I intended to tonight but I did manage to run a couple of sine waves through the new tube. Its obvious I've got a couple of deep holes in the response due to the room but I knew that before since the old sonosub showed the same "problems"
These numbers were obtained by running a cable from my soundcard to the sub input on the Denon 3300's external 6 channel input. I calibrated it to 70 dB with white noise (91 dB at 1KHz) and then started feeding the tube short durations from 100Hz down to 15Hz and writing down the result. The SPL meter was placed 1 meter away from the center of the tube and was flat on the carpet. The sub doesn't fit in the far corner so it was left beside the entertainment unit and against the wall. There is a opening immediatly to the left which goes down a hall way and a short wall beside that so its corner loaded minus the doorway. I then entered the values into an excel spread sheet and corrected them for the known errors the RS SPL meter has. Here are those corrected values. I intend to do some more testing and keep in mind this driver isn't yet broken it at all.
Hz dB*
15 73
18 81
20 86
25 90
30 91
35 94
40 96
45 95
50 86
55 90
60 99
65 87
70 95
75 92
80 96
85 95
90 91
95 92
These numbers were obtained by running a cable from my soundcard to the sub input on the Denon 3300's external 6 channel input. I calibrated it to 70 dB with white noise (91 dB at 1KHz) and then started feeding the tube short durations from 100Hz down to 15Hz and writing down the result. The SPL meter was placed 1 meter away from the center of the tube and was flat on the carpet. The sub doesn't fit in the far corner so it was left beside the entertainment unit and against the wall. There is a opening immediatly to the left which goes down a hall way and a short wall beside that so its corner loaded minus the doorway. I then entered the values into an excel spread sheet and corrected them for the known errors the RS SPL meter has. Here are those corrected values. I intend to do some more testing and keep in mind this driver isn't yet broken it at all.
Hz dB*
15 73
18 81
20 86
25 90
30 91
35 94
40 96
45 95
50 86
55 90
60 99
65 87
70 95
75 92
80 96
85 95
90 91
95 92
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