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Multi-Way Conventional loudspeakers with crossovers

Freq measurements and Hypex Filter Design adjustments
Freq measurements and Hypex Filter Design adjustments
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Old 16th September 2019, 07:03 PM   #201
Steve2111 is offline Steve2111
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Default Freq measurements and Hypex Filter Design adjustments

Attached farfield Tweeter HighPass LR4 at 1KHz. Still not good enough if the final XO at 2.5KHz? Does begin to slope down around 2KHz

If at this stage I'm not going to take into consideration off axis responses, should I now start to measure in HFD? Would I then be able to design filters easier in the graphic screen?
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File Type: jpg FARFIELDLR4HighPassNoOther filters.JPG (204.8 KB, 106 views)
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Old 16th September 2019, 07:19 PM   #202
Steve2111 is offline Steve2111
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Default Freq measurements and Hypex Filter Design adjustments

What is Step Response used for?
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Old 17th September 2019, 04:56 AM   #203
YSDR is offline YSDR  Europe
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Quote:
Originally Posted by Steve2111 View Post
Attached farfield Tweeter HighPass LR4 at 1KHz. Still not good enough if the final XO at 2.5KHz? Does begin to slope down around 2KHz

If at this stage I'm not going to take into consideration off axis responses, should I now start to measure in HFD? Would I then be able to design filters easier in the graphic screen?
If you saved that measurement then please generate a target response overlay to it, like be seen in the following picture, and you can check yourself or post that overlayed response. Optimally, the target response and your tweeter's response would be exactly the same.
1kHz_HP_LR4.png

Last edited by YSDR; 17th September 2019 at 05:02 AM.
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Old 17th September 2019, 08:00 AM   #204
Steve2111 is offline Steve2111
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Default Freq measurements and Hypex Filter Design adjustments

I cannot overlay but can note down curves.
By the way, with target curve high pass, I didn't think that lower crossover freq would make a difference. Only high crossover freq. It actually does affect the curve if you enter a different lower crossover freq???? For the purposes of this exercise I entered high crossover freq 1000 and lower crossover freq 1000 too

Natural curve of tweeter acording to manufacturer
Starts sloping at 2KHz
at 700Hz = -10dB
at 400Hz = -20dB

Target curve with LR4 at 1KHz (though final XO will be at 2.5KHz)
Starts sloping at 2 to 3KHz
at 800Hz = -10dB
at 600Hz = -20dB

My measured curve with LR4 at 1KHz
Starts sloping at approx 2KHz
at 900Hz = -10dB
at 650Hz = -20dB

Measured is a bit steeper than Target and natural, I suppose because natural and crossover are summed?
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Old 17th September 2019, 08:52 AM   #205
YSDR is offline YSDR  Europe
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So we still do not know what is your tweeter's natural response in your situation. It looks different than in the published datasheet, even if we consider your 1kHz LR4 highpass filter.
If you want "better" crossover than your previous passive, it would be great to know your tweeter's response, or you need to learn how to generate target response in ARTA. In HFD you need to flatten the response first (without crossover) because it doesn't have target response generator.
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Old 1st October 2019, 09:32 AM   #206
Steve2111 is offline Steve2111
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Default Freq measurements and Hypex Filter Design adjustments

Will Farfield measurement of tweeter with LR4 at 500Hz be OK for "natural response? I guess that the final XO freq will be 2.2K to 2.5K
Should I measure in ARTA or HFD?
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Old 1st October 2019, 10:39 AM   #207
YSDR is offline YSDR  Europe
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Hi Steve!

LR4 at 500Hz would be ok for an xo point 2kHz and up.

You can measure either with ARTA or with HFD. ARTA have more options measurement wise (averaging, using overlay etc.), but with HFD you can more easily visualize the response shaping.

You still don't have to do the measurement too loud, you can measure the frequency response well below normal listening levels.

Last edited by YSDR; 1st October 2019 at 10:42 AM.
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Old 1st October 2019, 12:13 PM   #208
AllenB is offline AllenB  Australia
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Quote:
Originally Posted by Steve2111 View Post
Will Farfield measurement
Measuring far-field is not ideal, if that's what you mean.
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Old 1st October 2019, 12:59 PM   #209
Steve2111 is offline Steve2111
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Default Freq measurements and Hypex Filter Design adjustments

Quote:
Originally Posted by AllenB View Post
Measuring far-field is not ideal, if that's what you mean.
Hi
How do you suggest it's measured?
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Old 1st October 2019, 01:20 PM   #210
AllenB is offline AllenB  Australia
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I assume you want to get away with one measurement per driver, so I would start by calculating the difference in the driver distances at the listening position, then find a spot around 1m away from the speaker that keeps that difference. I'd start with a measurement at 20 degrees off-axis, and I'd position it in the room so I could gate the measurement to remove the room. Then when listening, I'd position the speaker to reduce the room effect, and rotate it to set the tonal balance.

This of course, is highly oversimplified.
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