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HD15 Measurements

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JulianDA View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JulianDA Quote  Post ReplyReply Direct Link To This Post Posted: 12 April 2021 at 8:20pm
Hey Kalle,

We just used the original plans from this website and approximated the curve with 3 straight sections. There was no wadding inside the chamber and no other modifications.
If you want more HD15 drop me a message, we want to sell our 6 boxes unloaded for a relatively small amount of money ;)
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Kalle76 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kalle76 Quote  Post ReplyReply Direct Link To This Post Posted: 13 April 2021 at 5:52pm
Thanks for your offer, but i have some on my own :D

But maybe someone else could explain me why my measurement of the HD15s looks like this...

I uses a Scarlett Solo in combination with the ECM8000 Mic. All my other measurements look quite normal so i assumed its the cabinets fault. I used 5 angled pieces to approximate the curvature and built in the pd.154

https://imgur.com/a/HdqJOZd - https://imgur.com/a/HdqJOZd


Edited by Kalle76 - 13 April 2021 at 5:59pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 13 April 2021 at 6:07pm
How was your setup exactly? Outside/Inside?, walls, etc?
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Kalle76 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kalle76 Quote  Post ReplyReply Direct Link To This Post Posted: 13 April 2021 at 7:30pm
I measured it in 2Pi free fiel outside but it was standing on my SBH. Could this make such a difference?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 13 April 2021 at 9:58pm
Yes that probably is the cause of the dip around 140-200Hz.
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Kalle76 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kalle76 Quote  Post ReplyReply Direct Link To This Post Posted: 14 April 2021 at 5:35pm
Ok thank you, a measurement on the ground made u huge difference.
But i mean if i cant use them on my SBHs they are virtually useless for me... what can i do to make them run properly in this case? Are there other cabins for a pd.154 that work better?
I thought of the BPH-238 maybe. 

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Kalle76 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kalle76 Quote  Post ReplyReply Direct Link To This Post Posted: 25 April 2021 at 1:15pm
Hi again, i tried to measure them again a few times with different positionings but this dip at about 150Hz is still occuring. Maybe anyone of you could explain me that because i have no idea....
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JulianDA View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JulianDA Quote  Post ReplyReply Direct Link To This Post Posted: 25 April 2021 at 2:44pm
Are you measuring with the mic laying on the ground or do you have it somewhere above the ground? You should measure low frequencies with the mic on the ground so you dont get cancellations due to pathlength differences between the direct sound and the sound that gets reflected on the ground between your box and the microphone ;)
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