2 Attachment(s)
RTA #3 Contour filter off/on N800F
For these tests I reverted to 2-way using the stock N-800F crossover. I was only able to test one speaker, but I believe previous tests indicate the drivers are close. I set the HF pot to “2” because that is the factory ref. and also happens to be a spot which is not intermittent. I used a dummy load when removing drivers as previously. One set of readings with the stock crossover, another with contour filter added (6.2uF+8Ohm paralleled in series with 902 as shown.) I also reversed the phase of the 902 for comparison.
I used a distance of 3ft, mic positioned to center of 811B horn (this works out to approx. 3ft high,) excepting the woofer nearfield reading which is 3in., same as last time.
Listening impressions:
First thing I noticed was that the pink noise output sounded softer, I didn’t need muffs this time, though I wore them anyway. (I kept amp level and pink noise output exactly as before.)
Unfortunately there was no extra time to listen much, but I rigged mono signals to both the 2 and 3 ways. No time to listen with contour filter. The 2 way sounded great compared to the 3 way. Much more balanced mids, highs were actually better, less smearing there. Sounded well extended too. The 3 way was horn forward and “pointy” in that range. Sounded like it had less bass, and rather irritating in comparison.
This was a listening test which I did during cleanup, about 15 mins, but the change is large and easy to hear. Sorry I did not have time to listen with contour in. But to my eye, the measurements don’t show an enormous change with it in, though there is clearly an effect.
I was amazed to see how high the 902 goes. And I thought to myself, especially after listening, “why did I want to change this?” Well, please remember that previously I had loading caps on the 902s, and never heard this system in 2way with the bigger back covers on. I believe that is one factor. Another is the relative auditioning. The comparison to the 3 way which is not optimized. (I went back to look at the 3 way RTA and found it looks smoother overall, hmmmm.) One thing is for sure -- hearing this monitor 2 way for 15 mins has excited me again about the potential it has.
I’m still reading. Eager to hear all your comments and absorb the expertise. I’m definitely willing to experiment much further in pursuing the maximum potential from the 9844s. Zilch I know you’ve helped a lot and I don’t want to be presumptuous.
Pics below, and I think I can take the plastic off the DEQ2496 now....