[bladesmith]

It almost looks like a crossover network causing it.  (Imho)

(You could send a 196hz test tone into your system,  look at the db reading,  real time. Then do some adjustments,  with your system/room. Hear it in real time. Keeping the test tone running, while you tweak.)

[murphy11]

The amp crossover goes from 150 down to 30. I have it set at about 120. Turning the amp completely off and taking the crossover out of play still causes the same dip at 199.

EDIT: Actually I haven't recently measured both speakers independently in awhile. I can try that to see if one or the other speaker is significantly off.

[bladesmith]

By the way, those are some nice speakers.

[Hipper]

You may find that the null has minimal effect on your music listening.

199Hz has a wavelength of around 1.72 meters, so you could see if there is anything obvious with that length or half of it, namely 86 cm or so, from the speaker.

Real Traps do a down load of test tones which includes every frequency from 10-300 Hz:

http://realtraps.com/test-cd.htm

199 Hz is virtually 200 Hz which is one of the 1/3 octave band frequencies often used.

Your frequency response isn't that bad. Here's mine with 1/24 smoothing for left and right speakers as a result of my efforts described above. I like the sound I get but the FR is hardly perfect! Below 50Hz I don't trust the microphone measurements because of traffic noise.

Remember, this FR is what the microphone hears, not what I hear!!!

[murphy11]

Thanks guys for the feedback. I really like the mini strata speakers and the point about what your ears tell you is a good one. I listen almost exclusively to Pandora through the latest dragonfly DAC to 80's, classic alternative, pop and sometimes country. I'm not a critical listener or really serious but I do want to get the best sound I can at a reasonable price.

Depeche Mode Blasphemous Rumours digitally remastered version came on the other day when I thought I had my setup tweaked pretty well. There is a ton of movement of sound between left and right speakers in that track and it seemed to be well recorded in that it really sucked me in. I think at some points the sound moved behind me (like a helicopter fly-over in a 5.1 track)  but this was 2 channel. I could have sworn I had a 5.1 setup listening to that track - the sense of enveloping sound was incredible. Also reminded me of closed cans headphone sound.

After I make a few more measurements I am going to buy that track and listen to it more critically to point out what I hear at different places in that track. It was really cool and I have to remember that the end game is having a system that can get me really involved in the music.

[murphy11]

I think my room is slightly asymetrical and placing the speakers exactly at the same distances caused comb filtering. After placing a blanket over the couch, adding another small panel at a reflection point, and further tweaking speakers I was able to get the following measurements.

[murphy11]

Mono 1/48 smoothing - I am very happy with this after taking many hundreds of measurements. The ONIX mini strata speakers (in my experience in my room) are very sensitive to placement and spikes\forward tilt. I'm not concerned about the dip at 197 - at 71db it's only 30hz wide from 181-210 and is the best I've gotten in the last few months of measuring.  The dip at 300 at 71db is only 15hz wide from 291-306. I have not known the meaning of the term 'well enough alone' until now 

[murphy11]

OK - I don't know the meaning of well enough alone Bumped the bass levels up slightly and like the new sound and measurements. (1/48) Also, quick plug for some Ultratouch insulation I posted in the for sale forum. Worked great in my setup.