Vent too long for enclosure |
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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it looks to me like the KH310 uses a sealed-back mid, so it already has its own rear chamber built into the driver
google kh310 disassembly |
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7199 |
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"Now I have to find how to do that in the most efficient way possible. Do you have any advice ?" It's really quite simple. Something like this:- Or just use a plant pot! |
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Earplugs Are For Wimps!
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infrasound
Old Croc Joined: 13 May 2011 Location: Brizzle Status: Offline Points: 2276 |
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Depends how big it needs to be.. But you can use a pot or pan with epoxy, or use bolts and bracing
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ssbb1fire
Registered User Joined: 13 March 2021 Status: Offline Points: 46 |
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I've searched a lot this afternoon about that.
You're right, I have to isolate the medium for the woofer. Now I have to find how to do that in the most efficient way possible. Do you have any advice ? |
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APW
Young Croc Joined: 13 November 2012 Location: Kent, UK Status: Offline Points: 1173 |
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The pressure generated by the woofer will cause the mid into high excursion.
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ssbb1fire
Registered User Joined: 13 March 2021 Status: Offline Points: 46 |
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Don't take it personnaly, but as I never heard of such thing, I'd like to know more about it. Can you explain to me why the medium would be influenced by the woofer if they are in the same enclosure ?
Where have you learned that ? A book, youtube, video, forum ? To get some data about it. |
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7199 |
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Yes - the tweeter should be ok, as they are (usually) isolated already, but the MF driver won't. You can use something as simple as a plant pot! Anything that seals it off from the LF waves within the cabinet. |
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Earplugs Are For Wimps!
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smitske96
Young Croc Joined: 16 February 2016 Location: The Netherlands Status: Offline Points: 1085 |
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The LF driver will interfere with the MF driver.
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ssbb1fire
Registered User Joined: 13 March 2021 Status: Offline Points: 46 |
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Why does the medium and tweeted must be acoustically isolated from the woofer ? That's the first time I've heard someone tell me that.
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Conanski
Old Croc Joined: 26 January 2006 Location: Ottawa, Canada Status: Offline Points: 2515 |
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infrasound
Old Croc Joined: 13 May 2011 Location: Brizzle Status: Offline Points: 2276 |
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You can head up to 30m/s if you have well rounded edges on a round port, in my experience.
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ssbb1fire
Registered User Joined: 13 March 2021 Status: Offline Points: 46 |
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Yeah Neumann uses a sealed enclosure, and they still have an outstanding frequency response and group delay.
I'm guessing their self-made loudspeakers are just incredibly well tought to allow that. I don't have the same woofers but I can try to match their data (or even try to do better, who knows ?). I'm targeting the lowest air velocity possible of course. But I think a limit to target is 15 m/s because there will also be pressure from others drivers and that will increase air velocity (I think ?). 15 m/s is of course when the driver is exited with its maximum power (here 100 Watts). I have put the dimensions for wich the air velocity is 15 m/s as an attachement, can you see it ? [IMG]uploads/24032/air_velocity.png[/IMG] Ps : I have a problem, why does WinISD keeps setting the end correction of the vent as 0.732 ??? Changing it doesn't affect anything. |
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