A little test with an open 15P80ND. Quite good 40 to 20k with just three EQs.
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Pondering a 950 LR4. Just that 2.2k dip.
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In REW there is a camera icon with the word Capture underneath it. Press that to take a screenshot including all your scales etc. If you set the Horizontal width to 800 pixels it can be put inline without making the window too big.
Taking screen snips without the scales makes it difficult to know what you are looking at 🙂
Taking screen snips without the scales makes it difficult to know what you are looking at 🙂
Have you tried anything to address the 2.2k dip? Is it a floor reflection ... horn reflection? Does putting in a piece of foam help?
It's a good way to get the time alignement right. I also believe that it will reveal diffraction issues.
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Does this spectrogram time alignment differ some how looking by phase response?
yeah, seems to do something. looking by my old random file where was some polarity check made
yeah, seems to do something. looking by my old random file where was some polarity check made
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Two drivers can have overlapping phase response, and at the same not be properly time aligned. Spectrogram is also a good way to show resonanses. You could probably use the combined phase response to determine if the time alignement is good, but i think the spectrogram is a very good visualization.
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phase from same file.
There is many sort of diy people and i try to let all flowers bloom.
i myself phase match but sure there is impulse matching people and some tape measure distances. People can do what ever they finds best from themselves.
In good measuring conditions, i find it easier to see if the low\mid frequency range is time aligned with high frequency range, and if not, then by how much is it off in ms instead of degrees.
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not real problem in home audio since you have to setup it once. pro´s uses dual channel FFT like smaart and it is 10times faster than rew.
Just a machined ring with M6 tapped holes in the back. M6 x 40mm bolts from the back of the baffle.
First images
200Hz LR4 high pass only
30 degrees off-axis, no EQ
caveats
- used the D2 Audio HDK dsp & amps
- in a factory setting
- used 50mm GK acoustic panels on the floor
200Hz LR4 high pass only
30 degrees off-axis, no EQ
Second images
200Hz LR4 high pass only
0 degrees off-axis, no EQ200Hz LR4 high pass only
caveats
- used the D2 Audio HDK dsp & amps
- in a factory setting
- used 50mm GK acoustic panels on the floor
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200Hz LR4 high pass only, no EQ, approx 7degs per line.
caveats
- used the D2 Audio HDK dsp & amps
- in a factory setting
- used 50mm GK acoustic panels on the floor
Waveguide looks like it performs as it should off-axis.
caveats
- used the D2 Audio HDK dsp & amps
- in a factory setting
- used 50mm GK acoustic panels on the floor
Waveguide looks like it performs as it should off-axis.
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Let me know what range in X and Y you would like to see. I'll set up again next week and also improve upon my test area at work. Failing that, these guys are only a few miles from me. Wonder what their day rate is...
Trent Sound Testing - Trent Instruments
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