The little "EVIL" cameras (Electronics Viewfinder Interchangeable Lens) like that Olympus and my Sony NEX7 are real convenient sizes for quick stuff, but in general the small sensors they have limit noise performance and above ISO800 they get a bit grainy- that's the diplomatic description, I think.
I just got my daughter an NEX6 for XMAS, which seems like a good set of tradeoffs, most of the good user features of the NEX7, plus a real mode wheel, BUT 2/3 of the resolution with the same size sensor, so noise performance is better.
Back to business - I did get distracted by some other tasks and activities today, but did finally finish the important stuff- new measurements!
These are gated measurements in room, with long enough gates to show some of the room modes (35H and 170 Hz dips), but still OK for development, in my opinion.
The Aurasound NS12-513-4A
An on-off axis series for the Accuton C173-6-90; 0 deg, 15 deg, 30 deg, 45 deg
An on-off axis series for the Jantzen JDT-1024. Also at 0 deg, 15 deg, 30 deg, 45 deg. Looks like they made some fairly decent design decisions with their diffusor dot; this is about the best performance off axis I've measured for a hard dome. :T
And of course, checking distortion on the JDT-1024 out of curiosity - I'd say it's fairly decent, in the high end Seas/Scanspeak range above 1500 Hz. Third order is very low, 2nd order fairly reasonable. I was NOT trying to do super quiet distortion measurements, just took SPL test data in Fuzzmeaure and did a distortion analysis- ambient noise was higher than I'd like for this test.
Well, time for some dinner, then exporting FRD files and seeing how things look in LspCAD! :B
I just got my daughter an NEX6 for XMAS, which seems like a good set of tradeoffs, most of the good user features of the NEX7, plus a real mode wheel, BUT 2/3 of the resolution with the same size sensor, so noise performance is better.
Back to business - I did get distracted by some other tasks and activities today, but did finally finish the important stuff- new measurements!
These are gated measurements in room, with long enough gates to show some of the room modes (35H and 170 Hz dips), but still OK for development, in my opinion.
The Aurasound NS12-513-4A
An on-off axis series for the Accuton C173-6-90; 0 deg, 15 deg, 30 deg, 45 deg
An on-off axis series for the Jantzen JDT-1024. Also at 0 deg, 15 deg, 30 deg, 45 deg. Looks like they made some fairly decent design decisions with their diffusor dot; this is about the best performance off axis I've measured for a hard dome. :T
And of course, checking distortion on the JDT-1024 out of curiosity - I'd say it's fairly decent, in the high end Seas/Scanspeak range above 1500 Hz. Third order is very low, 2nd order fairly reasonable. I was NOT trying to do super quiet distortion measurements, just took SPL test data in Fuzzmeaure and did a distortion analysis- ambient noise was higher than I'd like for this test.
Well, time for some dinner, then exporting FRD files and seeing how things look in LspCAD! :B
Comment