Over the weekend I was able to meet up with Jazzi and get a little one on one with him over my system. Even though it wasn't up to par, not the point, I was able to get some helpful pointers getting me onto the right path as far as the fundamentals go. I'm making this thread so I can post up my measurements and get pointers from others (I looking to learn be it fundamentals, strategies, guidance. Not looking for cut here and there to fix that freq response. It's not the point of this thread)
Here is my setup:
Pioneer 4100NEX > 360.3 > PDX V5 > TM6.5's ported and Audible Physics RAM 3a in sealed pods on dash
While talking with Jazzi and talking about the goals of my system and what I didn't like about the sound. Said that there is a piercing/annoying feeling from my setup and we went through were I thought the freq range was and figured out it was really within the 2k-4k range and then he mentioned to me about the distortion graph, which I never thought to pay attention to honestly. So I pulled up the most recent measurements from the night before:
BTW these have no smoothing
Here is the Passenger Side FR showing the distortion tab on REW
Bout gave Jazzi a heart attack so we pulled up the driver side next
Driver Side FR
Needless to say its all jacked up. From what Jazzi told me when looking at the distortion graph you want the most amount of distance between the Black THD line and your fundamental line as possible. It should gradually follow your fundamental line and then should have a sharp increase. Neither of mine are doing that. Driver side was better than passenger side but still has a issue between the 1k and 2k range.
Now the sub was looking great:
It follows the fundamental and doesn't really so anything out of the ordinary
Ok fast forward to today.
1) I was told to look into seeing if the FR pods had any kind of dampening inside them. Well they did not so I added some poly fill to hopefully dampen some as that could cause the distortion issue.
2) Added the rest of the screws to the pods as the drivers themselves could not be fully sealing against the pods. In fact they were not.
3) Gains could be a issue here so I readjusted them to make sure nothing was out of wake.
4) Recalibrated the 360.3's inputs as it was way out of wake to begin with.
At this point I decided to give a test to see if any of these had improved anything.
Here are the results:
Passenger Side Crossover selection
MB
FR
Decided on 40hz for the HPF on the mid bass drivers as things seemed to be ok at that point. Probably will bump that up to 50hz though from now on though. Also choose 400hz HPF for the full range drivers as that seemed to be a really good spot based off the graphs vs distortion. Now if I should look into others let me know on this one please
Here are the results with crossovers in place
MB
Passenger
Driver
FR
Passenger