An interesting looking modern design.
Lii Audio H1502
Is it a tea strainer or a pepper grinder in the middle?
Comes with crossover with adjustments which is a big plus.
https://www.google.com/url?sa=t&rct...usg=AOvVaw1A-7WVArJuLL3Hkl_7_f4E&opi=89978449
Lii Audio H1502
Is it a tea strainer or a pepper grinder in the middle?
Comes with crossover with adjustments which is a big plus.
https://www.google.com/url?sa=t&rct...usg=AOvVaw1A-7WVArJuLL3Hkl_7_f4E&opi=89978449
I don't live in the Matrix 😉
Tell me how (without room modes & reflections) a symmetrical dual concentric driver
can be anything other than a point source.
Many ways, for example the cone 'waveguide' moves. Also the waveguide diffracts, as does the edge of the driver and the box. Also the dome changes it's acoustic size at higher frequencies.
Nonsense, it is still centralized to a (realistic) central point.
I'm not talking about distortion!
I'm not talking about distortion!
Allen is not talking about HD either. Without a proper xover, you can have a coax that does not behave as a point source. This is not simply given by geometric means alone.
Nothing so devious I'm afraid, I'm assuming a good crossover. Keep in mind I've merely been discussing semantics, but nothing a designer wouldn't already consider when designing any speaker.
As you are now expanding the scope of this, let's ask the question whether there is a benefit or whether it's necessary to achieve real point source behaviour for good sound. Additionally, can it be achieved with non coaxial or non-coincindent drivers?
KEF says - "a point source is an energy source with negligible dimensions".. so when planet10 strives to lower a crossover frequency to reduce the centre spacing in wavelengths when designing a 'wideband and woofer' conventional crossover, he is aiming for point source like behaviour out of non-coaxial drivers.
KEF says - "single apparent source loudspeaker" when referring to their speaker. They are implying that imaging is good when perceived by humans.. not that point source like behaviour is strictly necessary for good imaging.. it is not. They do not claim their product is wholely point source by strict definitions.
KEF says - "A co-axial speaker is not a good point source", perhaps in recognition of their understanding of the issues. It does not mean that coax is a bad thing.
There are some things mentioned in the link which should probably be better qualified, since some readers may read more into it than they reasonably should.. but I've chosen to begin with the more standard definitions.
KEF says - "a point source is an energy source with negligible dimensions".. so when planet10 strives to lower a crossover frequency to reduce the centre spacing in wavelengths when designing a 'wideband and woofer' conventional crossover, he is aiming for point source like behaviour out of non-coaxial drivers.
KEF says - "single apparent source loudspeaker" when referring to their speaker. They are implying that imaging is good when perceived by humans.. not that point source like behaviour is strictly necessary for good imaging.. it is not. They do not claim their product is wholely point source by strict definitions.
KEF says - "A co-axial speaker is not a good point source", perhaps in recognition of their understanding of the issues. It does not mean that coax is a bad thing.
There are some things mentioned in the link which should probably be better qualified, since some readers may read more into it than they reasonably should.. but I've chosen to begin with the more standard definitions.
I beg to differ, as it is a reasonable 'means to an end'.
Basically (ex low frequency) minimizing audio output to the smallest size point is the point.
Realistic constraints must obviously be taken into account, but there is a distinct difference
between the dispersion pattern of a coax. and spread-out drivers.
PS.
My main L/R speakers are 2 meter tall dipolars, so this is not a personal 'axe to grind'.
We still differ on our definitions of what point source means, so I'm finding myself unable to see a common point of reference, and struggling to continue.
Have you noticed that in astrophysics, an entire galaxy can be seen as a point source of light if it is far enough away.. even though it is immensely greater in diameter than a wavelength?
Have you noticed that in astrophysics, an entire galaxy can be seen as a point source of light if it is far enough away.. even though it is immensely greater in diameter than a wavelength?
Who can say what the most correct source is in a room. None are perfect. A floor to ceiling line source in a corner might offer a particularly long time to first reflection with minimal diffraction..?
My practical experience with fullrange speakers shows opposite.
One test can be seen at
it is in russian language but images and sound are self explaining.
Here are my measurements of fullrange, green line is 10 kHz+70Hz signal both about 0.5 W, purple only 10 kHz.
@carlmart Sorry but no.
@kaameelis If you’re going to refute my source I’m afraid you’re going to have to do better than a russian youtube clip and a graph.
@kaameelis If you’re going to refute my source I’m afraid you’re going to have to do better than a russian youtube clip and a graph.
Couldn't find it when I tried. 12" Tannoy Gold, ~2.5 kHz on the tweeter and ~30 Hz on the woofer. Maybe 3/4" peak-peak excursion. Absolutely no change down to the noise floor in the tweeter's harmonic distortion profile with the woofer driven or not. I was tensioning the tweeter diaphragm screws for minimum THD and got into the 0.15% range so it should have been pretty sensitive. Granted, it was on-axis only.
If you look at green line in my measuremet, it has similar shape as digital signal jitter, only 70 dB or more higher than worst device jitter
https://www.audiosciencereview.com/...nd-like-jitter-test-tracks.41428/post-1466904