My SMT212 CP755TI / SN12B |
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wafflesomd
Young Croc Joined: 21 September 2007 Status: Offline Points: 811 |
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I do plan on porting them. I was talking to a friend of mine, and he stated that buy design, the cabinet will resonate at 400-500hrtz. I guess I'm going to hold out until I get some proper drivers. I'd like to see some measurements with some Delta's, or other drivers. I really can't stand resonance at all. I havn't purchased any new drivers yet. Seems like the only driver that has been proven to work well is the p.audio sn12b. That driver is far to expensive. I can't find another driver with even close specs. It seems like the x12 might be a better solution for me. I'm not looking to spend huge amounts of money on drivers.
Edited by wafflesomd - 06 November 2008 at 8:32am |
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Tekasis
Old Croc Joined: 03 July 2006 Status: Offline Points: 6492 |
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You tried looking at the Celestion Truvox series ?
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A home without books is like a body with no soul. |
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wafflesomd
Young Croc Joined: 21 September 2007 Status: Offline Points: 811 |
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I'm not sure how well those would work. The specs are close the Emeinence beta and delta.
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Deadbeat
Old Croc Joined: 12 March 2008 Location: Singularity Status: Offline Points: 3167 |
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wafflesomd - you also need to look at polars, FR graphs, etc to determine breakups and beaming and is essential in selecting xover point. This gives you a clearer picture.
' I was talking to a friend of mine, and he stated that buy design, the cabinet will resonate at 400-500hrtz. I guess I'm going to hold out until I get some proper drivers. I'd like to see some measurements with some Delta's, or other drivers. I really can't stand resonance at all. ' What was he talking about? Any reasoning you could enlighten us with?
Edited by Deadbeat - 06 November 2008 at 8:38pm |
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Away on extended leave.
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wafflesomd
Young Croc Joined: 21 September 2007 Status: Offline Points: 811 |
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He based this on the fact that the bottom, and piece F are parrellel and don't expand. I probably said that wrong.
Do emeinence have polar measurements? Edited by wafflesomd - 06 November 2008 at 8:49pm |
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Deadbeat
Old Croc Joined: 12 March 2008 Location: Singularity Status: Offline Points: 3167 |
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Haha. In that case all our speakers are flawed.
Anyway. Tell your friend that he is right in noticing standing waves in a cabinet caused by parallel sides. The distance from Piece F to the bottom is 680mm. This is the wavelength of 500hz - he's done the math right. Unfortunately, the driver's chassis and cone are in the way of nary a standing wave . Besides - any standing waves formed would be chased away if you stuffed and lined the boxes properly when finished.
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Away on extended leave.
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wafflesomd
Young Croc Joined: 21 September 2007 Status: Offline Points: 811 |
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Neato.
So how would I go about stuffing and lining these?
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Deadbeat
Old Croc Joined: 12 March 2008 Location: Singularity Status: Offline Points: 3167 |
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An average 12" begins to start being directive (beaming) at 1k2. Most manufacturers will give you polar plots at several frequencies. I don't think eminence do. If you wanted to be absolutely sure any standing waves were absorbed - I'd staple a thin layer of closed cell to the top and bottom of the chamber. Edited by Deadbeat - 06 November 2008 at 8:55pm |
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Away on extended leave.
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wafflesomd
Young Croc Joined: 21 September 2007 Status: Offline Points: 811 |
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The rear chamber, the waveguided section, both?
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Deadbeat
Old Croc Joined: 12 March 2008 Location: Singularity Status: Offline Points: 3167 |
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Just the rear chamber where your friend is mortally afraid of resonance. Top and bottom. Closed cell. Thin layer. Staples.
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Away on extended leave.
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wafflesomd
Young Croc Joined: 21 September 2007 Status: Offline Points: 811 |
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Thanks for the help.
Now it just comes down to driver selection. Using a 3 way design would be the most cost effective thing to do. Most 2" are very, very expensive, and the horns are as well.
Edited by wafflesomd - 06 November 2008 at 9:09pm |
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Deadbeat
Old Croc Joined: 12 March 2008 Location: Singularity Status: Offline Points: 3167 |
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What's your budget for the whole lot?
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Away on extended leave.
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