That upper treble (above 10k) response is quite something, and not in a good way. Is that tweeter breakup or just a resonance? The directivity heat maps show some strange behavior up there, too.
I can't tell if I'm seeing things or not (what smoothing is this?) but the midrange has some weird jaggedness going on in the FR. Port problems, perhaps?
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Yeah, I wasn't quite able to parse that out from the nearfield per-driver graphs. It looks like there are some resonances, but it's rather hard to tell.
Great review Erin!
Lots of port noise.Yeah, I wasn't quite able to parse that out from the nearfield per-driver graphs. It looks like there are some resonances, but it's rather hard to tell.
Excellent review like always, thank you!
I think it could be also due to the large vertical directivity rise around 500 Hz due to the all 3 woofers still active there. It can be also seen in your in room response which is too low between 300-700 Hz
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compared for example to the D&D 8c
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Imho a 2.5 way is an unnecessary compromise (especially with 3 woofers) at the price class and would be the reason for me not to buy those.
I do indeed. Let me show you my trials before producing the measurement that I showed:This makes sense. The Bass Response did look suspect to me. Is this the same problem you had with the Revel F328be? With that speaker, your measurements showed very poor bass extension, but it was obvious from the subjective listen that it was wrong. If so, do you know how to fix it?
Lots of port noise.
As I just noted, you need to have larger distance from the speaker. To the extent you have turned it sideways, you now need to have much more clearance vertically. This is not possible below the speaker due to limitations of the jig. You could try setting a much higher vertical distance to see if it helps.The speaker was measured on its side. I used the r-axis extension and the mic distance was somewhere close to 0.90 meters from the DUT. I have to send the data to Klippel to get it 'signed' via the new beta software and as part of this process I have been in talks with them to make sure the measurement data looks correct as the speaker was measured on its side. This was their feedback when they sent me the signed data file:
If you don't mind, how is this set for the NFS? Are you referring to the distance between the mic and the speaker or a setting for the farfield calculation? Or something else, like the maximum distance the measurement arm can move outwards?The issue is the distance from speaker.
but in this case, I don't think it is
Physical distance between the mic and speaker. Software optimizations, more scanning points, etc. don't help it.If you don't mind, how is this set for the NFS? Are you referring to the distance between the mic and the speaker or a setting for the farfield calculation?
Fitting error is not helpful here as you are surely in the near-field for bass frequencies. Ruben is commenting on the general scheme, not the issue I am discussing. It is the same response I received a year ago when I went to them with similar issues I had with F35 measurements.I'm not sure what the fitting error was (is) in your data (feel free to share if you'd like to do some group investigation).
As I just noted, you need to have larger distance from the speaker. To the extent you have turned it sideways, you now need to have much more clearance vertically. This is not possible below the speaker due to limitations of the jig. You could try setting a much higher vertical distance to see if it helps.
Again, I apologize bringing up this issue. After testing the F328Be, I almost regretted testing any large towers like this! Dealing with the massive speaker on top of member complaints about accuracy of the measurements was a bit much. In my case, I had even purchased the speaker myself so was stuck with the cost as well! Then again, this is one weakness of NFS (in a home setting as opposed to a large space) that you just have to learn about and figure out how to deal with (not testing such speakers, optimizing even more, etc.).
Share with them ground plane measurements and get their reaction. I showed them the Harman anechoic data and we were all puzzled by the large gap between what NFS had generated and their results.But as far as Klippel is concerned and as far as the data shows, the measurements are accurate in the LF.
Thanks for the permission. I will do that.If the people of this forum want to talk to Klippel and address their concerns with their own assessment and approval of my results then they are certainly welcome to. I, however, will trust the engineers who developed the NFS and take their input as the final word. So, you guys won't find me going in circles on this topic any longer. I've already moved on to the next set of measurements.