Limiters and HPF were not engaged for either Cap Pro nor for CHT 18.T products through the INuke. The only thing engaged for both subs were the parametric EQ settings exactly as shown in post #3. The screenprints you see are the exact dsp configs we used verbatium I had saved them prior to meet day (Cap Pro 15hz tune saved in December 2011, CHT Config created and saved Friday Jan 13, 2012) -- we simply loaded the config on meet day. I double and tripple checked the amp configs to make sure I had the right config loaded in both cases. Since there is still question what exactly audyssey might have done to the CHT products, I will post our retest information from Sunday now.
The most complete information I have on exactly what Audyssey did for the subs comes from Sunday's restest with Tesseract and Luke. Points of note - the room was different on meet day. We used 12 chairs to plot omnimic frequencies instead of one central location. We took Audyssey calibration from five positions on meet day (and a 'wider' bubble.), versus 3 positions in a narrower bubble for Sunday. The room was full of subs on meet day, but on sunday for this retest data it only had my Yamah CW218V subs (2x18"), the HSU subs (2x15"), my Captivator Pro subs (2x18") and a Infinity HPS 1000 sub in the room (3x15"). So maybe about half as many subs. The folding chairs and so forth used for the audition had been removed from the room by then and my berkline recliners replaced - which is where we did the measurements from. The subs were positioned in the exact same places for retesting however. The Audyssey calibration for both the Sunday test on the CHT subs and the HSU subs was taken from my normal seating arrangement's positions. We placed the primary Audyssey sweep data gathering on the arm reset in between the two primary center listening seats, and follwed up with the two centermost recliner seat positions at ear level (using a tripod) to get our 3 data point Audyssey runs completed for the retest. We mimicked the exact standardized volume and AVR configuration settings from the meet however for every retest. Those steps include adding +3dB to each sub output (or in the case of a single sub out utilized like the dayton - adding +6dB to the single sub out) (this has be done to account for my AVR's flavor of MultiEQ XT issue where both subs are calibrated by Audyssey to 75dB individually so if you are running two subs you'll be hotter in the room than just running one sub. Summarily Dayton got +6dB to one sub out to make it match levels while the Inuke got +3dB to 2 sub outs just like on meet day with all contenders --- we followed this course for the MFW-15 amp as well on meet day
). We also changed crossovers to 100hz for mains and 120hz for sub, and we turned off Dynamic EQ for these tests --- just like we did on meet day.
Here are the timestamps of our testing.CHT RetestingHSU Retesting
To start we hooked up the Dayton amp and turned off everything Audyssey in the receiver, setup the the CHT subs in the same configuration used for the meet and saved a frequency response graph using the omnimic from the armrest between the two chairs in the main listening position. We ran the same test with the Dayton 25hz bass boost on and off. Here are those two graphs.
Then we ran Audyssey as described above and remeasured the frequency changes that Audyssey had applied. You'll see those two measurements here with the Dayton 25hz bass boost on and off. Ironically as you've seen now in two instances. The Dayton 25hz bass boost is not a 25hz bass boost at all - it just basically turns up all the bass - and appears at least on tesseracts amp to simpley be the equivalent of turning up the gain a bit. So here are the graphs for the Dayton and CHT 18.T with the Audyssey enabled and with and without the "25hz bass boost" applied.
When you put all the Dayton graphs together you see this
^ You'll also note that the graph between using the Dayton with bassboost and no Audyssey EQ is very similar to running the Datyon with no bass boost and Audyssey EQ. Turning on 25hz bassboost just seems to run everything a bit hotter.
We did some limited listening tests to the meet's demo clips with the Dayton amp after doing this setup and I agree we didn't hear any bad noises on the clips we tested for the short duration tested. However, the tactile bass was nearly competely gone in my room on the Dayton without the 4dB of boost at 20hz that the Inuke provided us, not tactile from the main listening positions which would be about the equivalent of the back row during our auditions.
Here are the results for the Inuke.
Both graphs are with our DSP filter shown in the 3rd post applied. For one FR graph all Audyssey settings turned off, for the second graph, Audyssey was run over the top of the DSP, and then the standardized changes were made again post Audyssey. Keep in mind we ran the exact DSP settings on Sunday we ran for the meet. This just shows what Sunday's retesting of Audyssey did to those DSP settings. Again all standardized settings from the meet were followed for every single one of these retests. (Both sub outs were turned up +3 db, Audyssey Dynamic EQ turned off, and crossover points set to 100hz for mains and 120hz for subs). You'll note that Audyssey actually trimmed our 4dB bump at 20hz dsp parametric EQ down just a bit.
When the Inuke was hooked back up the bass was much more tactile and present but the 100hz -20hz clip began making the noise at the lower end of the spectrum again (no amp clipping), though bass I love you never made any bad noises and was very tactile. I think the sweep must be mixed hot. The most intense movie scenes we tested on the inuke did prove the amp was clipping and the sub was indeed making bad noises on Jericho missle and Skadoosh.
Finally here are all six graphs shown together. No adjustment of any sort has been made to these graphs. These are exactly as measured on Sunday, the exact same DSP was applied on Sunday as was applied on Saturday during the actual meet, as was created and tested on Friday night.
About the time Tesseract67 had to leave for the day, Luke came over. We did the exact same thing with his HSU subs and tested how Omnimic adjusted the frequency response for the HSU's as well. Here are the results with his HSU subs. The first measurement is with all Audyssey EQ off in my room. The second measurement is with the standardized meet settings applied after an Audyssey run. Remember - just like we did for the CHT subs, the Audyssey sweeps were only taken from 3 positions (armrest of two center recliners, and two center listening positions chairs), and the omnimic readings for the retest were taken from the first position (armchair) in every instance.
Following the HSU tests we ran some of the demo tests and heard no bad noises coming from the HSU subs from any demo material tested in our short duration including the 100hz to 20hz sine sweep which we tested several times on both CHT and HSU subs on Sunday.
Here is the final retest data comparison for the Audyssey settings used during the Sunday's Jan 15 retest for both the HSU VTF-15H pair and the CHT 18.T pair on the INuke DSP3000 (with the DSP applied used on meet day).
For what it's worth (anything?) here are the two configs as set by Audyssey in five wide positions and measured by omnimic avereaged inside the bubble for the 12 positions for the blind audition for meet day vs. the two configs as set by Audyssey in 3 narrow positions and measured by omnimic (at the intial audyssey calibrated position only) for Sunday's retest.
As mentioned keep in mind all the variables, room changes, average mic changes for both omnimic and Audyssey, etcMeet Day FR vs Retest Day FR -
Gray for CHT and Black for HSU for meet day Jan 14
Red for CHT and Blue for HSU HSU for retest day on Jan 15