Complex numbers can be expressed as real and imaginary parts (vector) or as magnitude and phase (polar).
Right.If anyone here is concerned that the LRS will be shown to be lacking "measurement-wise", I'd suggest worrying more about the distortion results we'll see below 200-300 hz....even at 86db....I'm betting it won't be pretty...
Where did you get that idea?
I don't think I will have enough time for such extensive testing but if so, yes.Would you consider to do the test with Dirac on these LRS speakers, @amirm?
It is not the same issue for Dirac as it is not trying to compute the soundfield like NFS is.The problem is that if they're difficult to measure for knippel, they're hard to measure for dirac. And if your measurement is inaccurate, so is the correction. I don't know the theoretical answer, I'm just trying to think about it logically.
It is not the same issue for Dirac as it is not trying to compute the soundfield like NFS is.
It certainly presents a different response to it. How well it handles that, I don't know until I try it.And do you think correction for the near + far field responses for the LRS, or indeed any dipole speaker, might be a tough task for Dirac, ARC, etc., etc., ?
And do you think correction for the near + far field responses for the LRS, or indeed any dipole speaker, might be a tough task for Dirac, ARC, etc., etc., ?
Because of the back wave any far-field response is hugely dependent upon the room placement and treatment. Not sure trying to correct for measurements is worth the effort.
The biggest problem room correction programs seem to have IME is the reflected wave can be fairly large and introduces comb filtering room correction programs will try to correct. Sometimes they go overboard; another reason to restrict correction to the bass region.
At 215 Hz the LSR308 still radiates omnidirectional. If it's at the same location you should expect a similar dip.I see a dip at 215Hz in the Martin Logan response that I attribute to the wall behind the speakers:
View attachment 81815
It surprised me to see a similar dip (Red) in the measure of the JBL LSR 308 (located next to the ML)
View attachment 81819
Maybe its different because it’s a dipole, but for monopole speakers the SBIR from the front wall will occur at 1/4 the wavelength (measured at the baffle), so 46” would be ~70Hz.I see a dip at 215Hz in the Martin Logan response that I attribute to the wall behind the speakers: The speakers are about 46" from the wall behind.
Maybe its different because it’s a dipole, but for monopole speakers the SBIR from the front wall will occur at 1/4 the wavelength, so 46” would be ~70Hz.
Maybe its different because it’s a dipole, but for monopole speakers the SBIR from the front wall will occur at 1/4 the wavelength (measured at the baffle), so 46” would be ~70Hz.
My speaker baffles are ~2ft from the front wall and I indeed have a dip ~140Hz.