This is the actual measured spin of the speaker outdoors using an 8ms gate and near field merged response. The power response peak looks worse than it is, around 2db and not very audible in listening at all. Tried a dip on axis which brought the PR peak down a little but it also sounded a little worse to me. Low frequency roll off is high but thats no issue as these are crossed at 80hz LR4 to subwoofer. Extremely pleased with the results so far, can't wait to build the second and listen in stereo. I've also attached distortion measurements, however these were done indoors with a 5ms gate so the data below 300hz isn't useful. Nice low distortion however even at 100db, pleased to see its also mostly 2nd Harmonic too. I'm very surprised how robust the SB26ADC is even at a 1200hz crossover.
Attached is on axis, power response, DI, listening window. Distortion at 90, 95 and 100db, and Step and Impulse response without windows.
Attached is on axis, power response, DI, listening window. Distortion at 90, 95 and 100db, and Step and Impulse response without windows.
Attachments
If these mikes show nonlinearities most of the times the highs are recorded too loud. I think the EMM comes closer to a linear response too, but at the same time wonder because the Umiks are supposed to have a good correction file.
Btw nice results. I can image they sound just right.
Btw nice results. I can image they sound just right.
The linearity issue was present at various different levels. I'm not too bothered about the UMIK, I only really use it for my subwoofer integration, I trust the EMM6, especially with the factory calibrated graph in the box and the fact it tracks almost exactly to the measured response of the WG from augerpro.
Curious also on how it looks at the listening sweet spot planned. 2 or 3 m at home? But alas the gating to measure the bass is also about the heigth of the rodes you can measure the cabinet on... the one of your garden seems high though.
How much hz is 2 meters WL?
Although for the bass you can lie the cabinet sided on the garden soil with the mic as well.
How much hz is 2 meters WL?
Although for the bass you can lie the cabinet sided on the garden soil with the mic as well.
I should’ve been more clear, the VituixCad measured response is with nearfield bass sliced at 300hz, using an 8ms gate outside. The distortion measurements were done inside due to the wind outside, and so have around a 4ms gate so not useful below about 300hz.
monty: this is nice project. Looking at spinorama and power response bump, I also think this may not be as harmful as it looks. You mentioned Fc is 1200Hz, right? General approach nowadays is to cross over as low as possible. When I see the power response and DI, I think higher Fc would be better as could mitigate power response bump (power response dip coming from verticals could mitigate the bump). I mean Fc ~2000Hz. I do not know if it lead to better sound though.
The response of the 8NDL51 drops off pretty rapidly above 1.5khz. I tried an XO between 1800-2000 and it looked and sounded way worse. I’m very happy with the sound at the moment, and definitely prefer a lower XO frequency. Like you say, the Power Response bump looks worse than it is, it’s around a 2db bump.
Preference rating is 8.4 with sub, linearity is 2.5db. I’m happy!
Preference rating is 8.4 with sub, linearity is 2.5db. I’m happy!
