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[Project] Parabolic speaker
[Project] Parabolic speaker
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Old 14th May 2020, 10:45 PM   #51
JLoDoesIT is offline JLoDoesIT  France
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Join Date: Apr 2020
So @MattStat, I've followed your advice and tried to equalize using the miniDSP, audiotools on android and the mic you recommended.
I manage to enhance a lot the initial response curve from peaky between 1500Hz-10KHz to rather flat 500Hz-15KHz.
But the I listen to the music I know from other sound system and it's super bassy (let's say strong lower medium) so I had to minimize a lot my changes to find back something that sounds natural.
Have you got any explanation why that could occur? Am I doing the things wrong (especially trying to reach a flat sound pressure curve)?
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Old 15th May 2020, 12:25 AM   #52
mattstat is offline mattstat  United States
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Join Date: Oct 2009
Are you using an RTA or one of the impulse response modules?

If RTA, are you using pink noise as your test signal?

How are your mic and speaker set up? How are you holding the mic? Distances to nearby large reflective things (walls, floor, ceiling)?

Most people find a totally flat curve a little bright, so if things are working right, you shouldn't be having the impression you are.
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Old 15th May 2020, 06:59 AM   #53
JLoDoesIT is offline JLoDoesIT  France
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Join Date: Apr 2020
Quote:
Originally Posted by mattstat View Post
Are you using an RTA or one of the impulse response modules?
I was using RTA at first to make a draft tuning, trying to obtain a flatter curve.



Quote:
Originally Posted by mattstat View Post
If RTA, are you using pink noise as your test signal?
I was using white noise as a test signal.



Quote:
Originally Posted by mattstat View Post
How are your mic and speaker set up? How are you holding the mic? Distances to nearby large reflective things (walls, floor, ceiling)?
Speaker is toward the ground at a 1m70cm height.
Measure was done at the center of the skirt opening at 1m20cm height microphone in upward position.
Of course the whole system I'm measuring is a reflection factory as you know.



Quote:
Originally Posted by mattstat View Post
Most people find a totally flat curve a little bright, so if things are working right, you shouldn't be having the impression you are.
Ok I will try pink noise calibration and listen to how it fits my needs, tell me if you have any other idea.


cheers !
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Old 15th May 2020, 09:43 AM   #54
JLoDoesIT is offline JLoDoesIT  France
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Join Date: Apr 2020
pink noise => much better, thanks !
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Old 15th May 2020, 03:13 PM   #55
mattstat is offline mattstat  United States
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Join Date: Oct 2009
I'm glad the noise signal was the issue. That was the easiest one to fix.

For what you are doing, sticking with RTA and pink noise may give you what you need.

Impulse measurements are more involved and have more problems with reflections from nearby objects. They offer higher resolution under the right conditions, but for most people those conditions are difficult to achieve indoors at low midrange frequencies and below. More judgment and decisions are involved in setting them up and interpreting the results. I'm not trying to discourage you from pursuing them, just letting you know there's a learning curve involved, and that you can get good results with RTA for things like general equalization.
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Old 18th May 2020, 03:07 PM   #56
JLoDoesIT is offline JLoDoesIT  France
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Join Date: Apr 2020
I have found a 2nd hand support for my parabolic sound shower, it's really cool to see it materializing
WhatsApp Image 2020-05-18 at 12.38.12.jpeg


Still waiting for the amplification, the Chinese choice was not the good one.
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Old 23rd May 2020, 02:57 PM   #57
JLoDoesIT is offline JLoDoesIT  France
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Join Date: Apr 2020
So I did assemble my class A mono amplifier + a box to hold it
WhatsApp Image 2020-05-23 at 13.01.48.jpeg
WhatsApp Image 2020-05-23 at 13.41.12.jpeg
I get powerful sound now :-)
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Old Yesterday, 04:03 AM   #58
mattstat is offline mattstat  United States
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Join Date: Oct 2009
Mounted to the support, the reflector's look is less imposing than I expected. It has the vibe of a lamp, which is good for a home.

Nice to see the Nakamichi logo. I always liked that one.
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Old Yesterday, 09:00 PM   #59
JLoDoesIT is offline JLoDoesIT  France
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Join Date: Apr 2020
Yep, definitely not an issue in my living room
WhatsApp Image 2020-05-23 at 23.42.09.jpeg
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