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Anyone built/used these?

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njw View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote njw Quote  Post ReplyReply Direct Link To This Post Topic: Anyone built/used these?
    Posted: 06 January 2015 at 7:06pm
  
     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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Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2015 at 7:16pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Thomas Hosker Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2015 at 9:38pm
Would there been an increase in efficiency due the the drivers being magnet to magnet on the first design?

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Post Options Post Options   Thanks (0) Thanks(0)   Quote bitSmasher Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2015 at 11:26pm
Possibly, another option would be for "push pull" alignment to cancel even harmonics
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Saturnus Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2015 at 11:59pm
Originally posted by Thomas Hosker Thomas Hosker wrote:

Would there been an increase in efficiency due the the drivers being magnet to magnet on the first design? 

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).  

Originally posted by bitSmasher bitSmasher wrote:

Possibly, another option would be for "push pull" alignment to cancel even harmonics

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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Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2015 at 2:44am
Sort out the bracing and the PPSL will work just fine (assuming you know how to wire the drivers properly).
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Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2015 at 4:16am
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote bitSmasher Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2015 at 4:38am
Originally posted by snowflake snowflake wrote:

not great designs - ports and bracing could be a lot better
Without trying to be nasty, I've seen that posted a few times about Marc.O's boxes. Does he develop these beyond a sketch/sim and test them?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote njw Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2015 at 8:19pm
Originally posted by bitSmasher bitSmasher wrote:

Possibly, another option would be for "push pull" alignment to cancel even harmonics
  
 
  There is a push-pull design there;
  http://hornplans.free.fr/mpp246.html 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote njw Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2015 at 8:23pm
Originally posted by bitSmasher bitSmasher wrote:

Originally posted by snowflake snowflake wrote:

not great designs - ports and bracing could be a lot better
Without trying to be nasty, I've seen that posted a few times about Marc.O's boxes. Does he develop these beyond a sketch/sim and test them?
   
 
   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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Saturnus Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2015 at 8:27pm
Originally posted by bitSmasher bitSmasher wrote:

Originally posted by snowflake snowflake wrote:

not great designs - ports and bracing could be a lot better
Without trying to be nasty, I've seen that posted a few times about Marc.O's boxes. Does he develop these beyond a sketch/sim and test them?

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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Post Options Post Options   Thanks (0) Thanks(0)   Quote app Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2015 at 8:37pm
Originally posted by Saturnus Saturnus wrote:

Originally posted by bitSmasher bitSmasher wrote:

Originally posted by snowflake snowflake wrote:

not great designs - ports and bracing could be a lot better
Without trying to be nasty, I've seen that posted a few times about Marc.O's boxes. Does he develop these beyond a sketch/sim and test them?

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.


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