reduce the back volume of a mid horn |
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Angelow
Registered User Joined: 17 March 2010 Location: italy Status: Offline Points: 199 |
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Posted: 24 August 2018 at 2:47pm |
I would like to reduce the back volume of an old medium to horn to make the trapezoidal case (smaller to carry). How much should be the minimum volumw for the 12 "cone? |
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Conanski
Old Croc Joined: 26 January 2006 Location: Ottawa, Canada Status: Offline Points: 2515 |
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Do the 12's have an attached back chamber or are they sealed back drivers? If either of those you could shrink wrap the case around the drivers or even just eliminate the case altogether and just mount the horns on a baffle. If the driver is a convention open back and has no top hat on it then you can still reduce the enclosure size as much as you want, I bet these are crossed pretty high above 15 mid/bass or similar so low frequency response is of no concern.
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Angelow
Registered User Joined: 17 March 2010 Location: italy Status: Offline Points: 199 |
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to tell the truth I do not know how much they should be cut! they have no technical documentation! only a 3-way analogue crossover.
They were mounted on a single 18 w-bin!
everything is just a closed box, the volume reaches the sides of the horn, but the part with the tweeter is separate.
Edited by Angelow - 26 August 2018 at 2:05am |
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Conanski
Old Croc Joined: 26 January 2006 Location: Ottawa, Canada Status: Offline Points: 2515 |
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Pull out one of the mid/horn assemblies and post a picture of it.
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Angelow
Registered User Joined: 17 March 2010 Location: italy Status: Offline Points: 199 |
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Conanski
Old Croc Joined: 26 January 2006 Location: Ottawa, Canada Status: Offline Points: 2515 |
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Nice pics... but you forgot the most important part.. the driver.
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Angelow
Registered User Joined: 17 March 2010 Location: italy Status: Offline Points: 199 |
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the driver is old rcf l12p11 wl, but they have the coil burnt, I think I will use the model rcf mb12n351 that I already have at home, or the eigheensound 12nd610.
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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You should stick with the default membrane shape. Also 12n351 has high mms. So efficiency will drop.
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Angelow
Registered User Joined: 17 March 2010 Location: italy Status: Offline Points: 199 |
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so do you advise me to stay low as mms?
I have 12pr300 of faital and 12hpl64 but they are low power, but could be more efficient? or I buy the 12nd610 which are pure mid bass?
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mobiele eenheid
Old Croc Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1568 |
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I couldn't find the L12P11 WL but could find the L12P11 W (Fs: 55 Hz, Qes 0.18, Vas 75 L) Apart from having a similar cone shape, I would look at a driver that firstly has similar Fs, Qes and Vas and secondly similar Le and Mms, thirdly a voice coil between 3" - 4". I wouldn't rule the MB12N351 out for having a high Mms, especially since the Fs, Qes and Vas are a clear fit. Le and Mms are a bit higher, so you're probably trading extra power handling,for extended frequency response up high. If I would have both drivers laying around I would first try the 12ND610 as it looks closest to the original overall. But considering you already have the MB12N351 and it would be my second choice on the list of all the drivers mentioned, I would try them first. |
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Angelow
Registered User Joined: 17 March 2010 Location: italy Status: Offline Points: 199 |
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in fact I did not find any news with that acronym, but it is a woofer produced in 1985 perhaps you should completely redesign the room with a new cone ..
Edited by Angelow - 27 August 2018 at 2:51pm |
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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I suggest img editing software with occlusion.
Edited by gen0me - 27 August 2018 at 4:19pm |
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