"speakers angled facing" theories |
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_Natty_
Young Croc Joined: 01 April 2007 Status: Offline Points: 663 |
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Posted: 07 September 2017 at 1:04pm |
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can anyone try to explain to me what is the principles for having 2 speakers like in this mid cab, is not based on "push pull" principles or I wrong? |
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Conanski
Old Croc Joined: 26 January 2006 Location: Ottawa, Canada Status: Offline Points: 2515 |
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In this case it's all about packaging.. more drivers equals more output simple as that. At the frequencies those woofers operate at the angled baffle has no acoustic effect.. positive or negative.
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1647 |
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Sorry if this seems rude (especially if you're typing in a second language), but what you've written doesn't really make it clear what you want to know. You ask about 2 drivers, but there's 6 in the cab. So, I'll answer based on my best guess what you meant ;-) The cab as shown does not use push pull; all 4 low-mid drivers are facing the same way and being fed signal with the same polarity.Theoretically mounting one side's drivers reversed and flipping polarity on their connections would give some reduction in distortion, but it would introduce one or two other complications, which is presumably why Mackie didn't. First, it looks like there's not a lot of space for the backside of the HF driver as-is - it would never fit if the backside of one of the 12's was sticking out rather than in, so they'd need to redesign the cab or make it even bigger to get around that. Similarly, I don't think there's enough space to do the flip on both of the bottom 12's, as their magnets would foul each other. Secondly, (depending on how high the crossover to the high-mid is), reversing mid drivers could result in sound quality and or dispersion problems if sound waves reflected badly off the outward facing magnet. (Probably not that big a deal in this case, as they'd also interact in the same way with the rear surface of the HF horn, but it's a principle to be aware of.) Thirdly, Mackie are very sensitive to customer expectations and like to try and present their manuals etc in an accessible manner. Deploying drivers in a less common layout would give them more work to to do explain themselves and avoid having people think there was something "wrong" with the speakers as a result. HTH, David.
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Crashpc
Registered User Joined: 26 February 2008 Location: Czech Republic Status: Offline Points: 463 |
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Right now I'm in the decision mode for new tops, and I wonder if this alignment (V shaped mids and horn in the middle is doable for two 8"s setup with 1" or 1,4" crossed at 1500Hz.... That would be good compromise between conventional designs and coaxial drivers in 10" size....
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Nikon and Canon people should not be married to each other. Why did you let this happen?
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dlyxover
Old Croc Joined: 14 June 2007 Location: Liverpool Status: Offline Points: 1508 |
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Just coming to completion on a 12v cab.
Rather happy with the outcome Edited by dlyxover - 09 September 2017 at 9:11pm |
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In the Truth there is no news, and in the News there is no truth
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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even though the baffle is angled I think it will behave as a manifold to some extent giving up to 3dB extra sensitivity at the low end.
http://fulcrum-acoustic.com/assets/pdf/whitepapers/loudspeaker-manifolds-high-level-concert-sound-reinforcement-1986.pdf |
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matty w
Young Croc Joined: 27 August 2008 Status: Offline Points: 798 |
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Which Mackie cab is this ?
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Black to black , red to red , blue to bits ....
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BJtheDJ
Young Croc Joined: 28 November 2012 Location: Bristol Status: Offline Points: 884 |
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Mackie Fussion 3000 https://forum.speakerplans.com/mackie-fussion-3000_topic18521.html if the above doesn't work then try https://www.youtube.com/watch?v=8ehORyArkKw Edited by BJtheDJ - 09 September 2017 at 7:42am |
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If your vaccinations were mandatory and nobody in your class had measles,
then you know that you're not a Millenial kid.</f |
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_Natty_
Young Croc Joined: 01 April 2007 Status: Offline Points: 663 |
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Hi to all,
and thanks for all the replies... sorry for the late reply but I was away for a little time! I try to put some order...
Wich are this frequencies where this cab working?
yes david, apologize for my poor eng! and yes thanks u guess right... honestly i didnt see the other 2 drivers up (ive seen just 2) and I choose this pic just because i'd like to understand what type of loading is that one and looking in what are based and for what... at least the name of the loading type! If I well understud we talks about a normal sealed or reflex (i cant see in deep the box if its open in the middle of the angle) for optimize spacing and number of driver/speakers! it seems that u know well this cab... so how its sound in the mid-woofer part? Im looking for a solution from 200 to 800-1000hz...
this is exactly my goal too! but about 12" and 2" !
Are sealed or open in the middle? nice design!
thanks a lot for the link! ill check it carefully! |
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markie
Old Croc Joined: 31 October 2005 Location: Sunny Liskeard. Status: Offline Points: 4570 |
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One of my many unstarted projects is for 4 x VOLT 10" studio bass drivers (B250.2s). I was thinking of making 2, 2x10 cabs and was planning to use a V baffle as above. My reasoning was simply to make the cabinets deeper, thus more stable for pole mounting some 8" tops.
But I would also like to know if there is any acoustic benefit for doing this? |
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If it's got wheels or tits it's gonna cost a fortune
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Conanski
Old Croc Joined: 26 January 2006 Location: Ottawa, Canada Status: Offline Points: 2515 |
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Any time there is more than 1 driver in a pass band you get mutual coupling at frequencies below where the the wavelength is equal to the driver diameter, for an 8" driver that is about 1.5khz so as long as your crossover is there or below you are good. That means a 1.4" driver crossed a bit lower would work better especially of this is a high output application. Edited by Conanski - 13 September 2017 at 4:05pm |
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FrederikMA
Registered User Joined: 19 July 2017 Location: Copenhagen Status: Offline Points: 76 |
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+1 Conanski
You can, with a bit of simple geometry and some trial and error if needed, benefit from the destructive interference to match directivity through crossover passband between the comp horn and the lowmid section . Best regards, Fred |
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