GLM does phase correction between speakers and genelec subs too. That is covered. That been said, no subwoofer, speaker can have min phase behavior.
Most Genelec main monitors don't look as nice as The Ones or 8xx0 speakers in frequency measurements.
The Genelec 8381 speaker cannot be considered superior to the 8351 or 8361 in terms of sound quality. In fact, some argue that it is even inferior to other models in the The Ones series. However, where the 8381 excels is in its loudness capability. These speakers are incredibly loud and have constant directivity. In fact, they are the only speakers in existence with constant directivity and the ability to reach 129dB SPL. The closest competitor in this regard is the Me Geithain 800K. Achieving a loudness of 129dB with sine waves is truly remarkable.
Just think about it. He sits maybe ~3m away from the speakers so what’s the point of having 120+ dB speakers ?
Explain the psychoacoustical perspective please.
Yeah but don't the extra midranges and bigger woofers have extra benefited other than more SPL?
Just higher output. Just look at the measurents for the 8351. Where do they need improvement?
The 8081a seems to be able to generate more directivity with a 15" woofer, a very wide traditional baffle and what is likely phase control between the front and side woofers. The directivity of the 8381a seems to reach down to below 100 hz while the 8351b "struggles" to keep directivity below 300 hz. Also, the slot loaded woofers in the 8351b create group delay up to 400 hz which needs to be DSPed out which doesn't effect the traditional woofers in the 8381a.
CD is not the same as the language Toole uses in his book. He usually writes things like "smooth directivity". Constant directivity aims for flat response not only on axis, but also off axis. Since this is really hard to accomplish in practice you end up with a sloping response that somewhere in MF/HF, say due to a waveguide, shows an abrupt change in slope. Take the KEF speaker you posted. At 4kHz, the tweeter responses suddenly transitions to flat. Charles Sprinkle (of JBL, Harman, Kali) finds CD objectionable for that reason (the change in slope).
I haven't phrased it correctly last time, let me try again: During our evolution, we have always been surrounded by objects thick enough to absorb high frequencies, which is why our hearing appreciates a room response with a downward slope more. Our hearing perceives rolled-off high treble as neutral because of this. This is Geddes' speculation
Yet he designed JBL M2 which had flat DI from 1khz to 9khz and it scored high.
basically sound power of forward firing monopole speakers is higher in low frequencies than high frequencies. That's why in room response of well designed monopole speakers exhibit a downward slope towards high frequencies.I think the main reason room responses of a flat speaker seams to slope down is wrong mic. in a highly reflective room you can't use a free field meassurement mic, but most of the cheaper ones are.
out of the box they are close to diffuse field cause of their quase omni behaviour,
but than they provide us calibrations that are meassured in a quase-anechoic room. therefore the HF will be broght down:
now, a reflective room isn't diffuse field like either. it's somewhere inbetween
narrow dispersion behavior happens mostly in high frequencies. Because high frequencies have small wavelengths, their radiation pattern tends to narrow down as the frequency goes higher. As long as the speakers are not cardioid, dipole, the woofer is not 17 meters large, or their baffle is not larger than 17 meters, bass waves are omnidirectional.(below 200hz usually but this also depends on the baffle size of the speakers) Basically if the speaker is significantly smaller the wavelengths it is playing, its radiation pattern is omnidirectional. On the other hand, high frequencies' have smaller wavelengths they have very narrow dispersion. What waveguides does it to add diffractions in a controlled way to make the radiation pattern of the speakers wider of narrower.
Toole usually writes "relatively constant or at least smoothly changing"
Many of the top Harman speakers have had what I call stairstep directivity with relatively flat DI between a few hundred and a few thousand hertz, then relatively higher but relatively flat again until 7-10 kHz, then rising after that:
www.spinorama.org
You misunderstand. In the graph what's shown is the response of a pressure microphone, which are used in specific scenarios (like closed box tests). The microphone we use for measurement are free field and do not have that kind of aberration. There's a difference in construction which accounts for the change in response. Pressure microphones are also more directionally sensitive than free field mics.I think the main reason room responses of a flat speaker seams to slope down is wrong mic. in a highly reflective room you can't use a free field meassurement mic, but most of the cheaper ones are.
out of the box they are close to diffuse field cause of their quase omni behaviour,
but than they provide us calibrations that are meassured in a quase-anechoic room. therefore the HF will be brought down:
now, a reflective room isn't diffuse field like either. it's somewhere inbetween
This is perfect CD, taken from Geddes' paper.
Unless there have been some kind of preference studies done that I'm unaware of, there are no separate target on axis curves for those speakers.
Waveguides can only ever constrain radiation. They can never make it wider. What's done for tweeters to widen radiation in the HF is inserting a phase plug. At the crossover waveguides constrain the lower range of the tweeter so it does not destructively cancel with the higher range of the woofer.
