Kick Bin Design Idea B&C 15ndl76 |
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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Turn's out I have 38.9 L to remove volume wise from my chamber, which is a massive waste of space!
If I was to fill the chamber I would need to fill this amount! |
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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With the MR8XT roughly modelled to check for clearance. Planing on putting my the 1" comp in the horn mouth.
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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So I have been playing around with the horn a fair bit and it's certainly been challenging.
Here's a few pictures of the different iterations of the cabinet, last one being most recent. |
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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Still need to reduce the volume of the rear chamber to 17L.
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mobiele eenheid
Old Croc Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1568 |
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Why?
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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When I increase the chamber size my frequency response graph become very logarithmic, with big peaks and dips. By keeping the chamber to 17l it allows me to have a lower HPF and higher LPF.
As a plus it also seems to control the excursion.
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FrederikMA
Registered User Joined: 19 July 2017 Location: Copenhagen Status: Offline Points: 76 |
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Have you changed your hornresp values upon realizing what the directivity does to your response? As I understand, you are having problems trying to reduce front chamber volume to maintain high frequency extension, while the directivity response indicates too much high frequency energy?
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FrederikMA
Registered User Joined: 19 July 2017 Location: Copenhagen Status: Offline Points: 76 |
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The perfectly rigid boundery condition in hornresp can cause unrealistic peaks. If the rear volume affects your response in a weird way, try moddeling it with stuffing (lined).
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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Thanks for the tips! I'm now able to get the same response on axis with 20mm of lining at an FR of 4000, I do have a 4-5db peak off axis between 10-30 degrees between 200hz and 500hz. Not sure If this needs to be resolved or not?
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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My most recent attempt, 8 litre chamber plus 2.5l for the volume of the driver.
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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Unfortunately the small chamber is causing some serious displacement issues.
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