Anyone built/used these? |
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njw
Old Croc Joined: 26 March 2010 Location: S. Wales Status: Offline Points: 2572 |
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Posted: 06 January 2015 at 7:06pm |
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As above, has anyone built or used these; Or this one; There are a few similar designs kicking about as well and I was wondering how they sound and what advantages/disadvantages there are with these?
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ceharden
The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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You get a slight bandpass effect which often gives slightly higher output in the upper bass region and subjectively more 'kick'. Difficult to prove but my personal belief is that you do get some benefit to combining the output of both drivers into a single radiating output, better coupling of the driver to the air.
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Thomas Hosker
Registered User Joined: 20 June 2012 Location: East Sussex Status: Offline Points: 493 |
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Would there been an increase in efficiency due the the drivers being magnet to magnet on the first design?
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WWW.T8Audio.Com
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bitSmasher
Old Croc Joined: 23 June 2012 Location: Melbourne Status: Offline Points: 2296 |
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Possibly, another option would be for "push pull" alignment to cancel even harmonics
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Saturnus
Old Croc Joined: 13 July 2010 Location: Copenhagen Status: Offline Points: 2025 |
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Possibly but not likely as that would only be the case if the driver magnet design wasn't optimized from the start which it is on the RCF drivers used here. There are other benefits of physically connecting the drivers though but I can see that it isn't the case here either as the braces on the driver baffles would not be needed if the drivers were physically connected (which makes them a perfectly dimensioned brace in themselves).
Push-pull would in this case mean there's be no sound at (or at least nearly no sound as the drivers would just cancel each other out. |
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_djk_
Old Croc Joined: 23 November 2004 Location: United States Status: Offline Points: 6002 |
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Sort out the bracing and the PPSL will work just fine (assuming you know how to wire the drivers properly).
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djk
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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not great designs - ports and bracing could be a lot better. they are high sensitivity but don't go that low - at high power they will struggle to give decent 40Hz output which I would want from large boxes. and might as well put a meatier driver in as it is going to weigh a lot anyhow. +1 what DJK says about reverse driver.
Edited by snowflake - 07 January 2015 at 4:23am |
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bitSmasher
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njw
Old Croc Joined: 26 March 2010 Location: S. Wales Status: Offline Points: 2572 |
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There is a push-pull design there; http://hornplans.free.fr/mpp246.html
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njw
Old Croc Joined: 26 March 2010 Location: S. Wales Status: Offline Points: 2572 |
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I was wondering the same, Marc O seems to have designed a lot of boxes but you don't seem to see any out in the wild? Regarding the bracing, it shouldn't be that hard to improve?
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Saturnus
Old Croc Joined: 13 July 2010 Location: Copenhagen Status: Offline Points: 2025 |
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No genuine idea but they do seem to be more concept drawings and sims than workable speaker designs to be honest. Many kinks that needs to be worked out and improved before you could call many of them finalized designs. In most cases just putting the drivers in a standard BR box with both drivers and port on the front and suitably braced gives a better and more versatile result than the more exotic designs. Boring sure but it works.
Edited by Saturnus - 07 January 2015 at 8:31pm |
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app
Old Croc Joined: 26 December 2013 Location: Finland Status: Offline Points: 2435 |
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"what!?"
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