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Multi-Way Conventional loudspeakers with crossovers

Beautiful Swingin' Speaker
Beautiful Swingin' Speaker
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Old 23rd January 2010, 07:16 PM   #21
mige0 is offline mige0  Austria
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Originally Posted by event horizon View Post
Much like a dog the tail gets the whole dogs body moving,..
Yeah - good point - consequently he would need to suspend the bass too.
This way there is some isolation in "energizing" the floor too.

Michael
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Old 23rd January 2010, 08:07 PM   #22
mige0 is offline mige0  Austria
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The mid unit of the "PrimaLuce" looks interesting - anybody seen measurements of the Hertz HV-1600 or used it ?

Michael
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Old 24th January 2010, 07:53 AM   #23
StigErik is offline StigErik  Norway
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I knew that you would build something like this! Great work, and great inspiration for all of us!
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Old 24th January 2010, 08:11 AM   #24
mige0 is offline mige0  Austria
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Originally Posted by StigErik View Post
I knew that you would build something like this! Great work, and great inspiration for all of us!




########


With *your* thread you show and encourage us to consequently follow our ideas to the very bottom end – I'm really thankful for the great fun we all have had there !

I'm looking forward with which final rig you'll come up with.


Michael
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Old 25th January 2010, 12:33 AM   #25
CLS is offline CLS  Taiwan
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Good job, and thanks a lot for sharing

Quote:
Originally Posted by mige0 View Post
...

Beautiful Swingin' Speaker


Beautiful Swingin' Speaker

...
I got 2 questions:

1. Smart and clean solution for woofer! How is the acoustical effect of the gap? Is there any detectable 'leak' on LF?

2. The top-bottom walls of dipole horn seem horizontal and parellel. Would there be internal reflection? (Worrying about the non-flatness of wavefront... )

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Old 25th January 2010, 09:11 AM   #26
mige0 is offline mige0  Austria
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Quote:
Originally Posted by CLS View Post
I got 2 questions:

Two good questions but no "real" answer, I'm afraid


Quote:
Originally Posted by CLS View Post
1. Smart and clean solution for woofer! How is the acoustical effect of the gap? Is there any detectable 'leak' on LF?
Thanx for your kind words.
I have not measured – so I cant tell the accurate difference.
From listening I'd say there isn't too much a difference – I still have my active turn down shelving (!) around 45 -80 Hz in place – otherwise there's simply too much bass (well, in that room)
Also – there still is this physical sensing of the bass through the floor by my feet. Given the exceptional good isolation of swings regarding leakage path through the structure, this tells me at least something

This physical sensation through the floor I like a lot and is something I'm always after – its not that the carpet builds up in waves – but it has to be there – even at moderate levels.



Quote:
Originally Posted by CLS View Post
2. The top-bottom walls of dipole horn seem horizontal and parellel. Would there be internal reflection? (Worrying about the non-flatness of wavefront... )
Yes, top and bottom plate of *this* dipole horn are in parallel to simplify building and to keep inter driver distance low.

If we assume ideal flat wave front to exit the NEO3 and enter the horn – well, all vertical pressure points are in perfect balance to each other – so no reflection = "bouncing between top and bottom plate" should occur IMO.
On the other hand, with such a design, there is always the issue of "in-adequate termination" = extreme bending of the wave front = sharp 180deg diffraction - where the top and bottom plate ends.

This issue could be treated either in applying the horizontal contour in the vertical direction too – making up for a standard horn – or by figuring out a lip that provides smoothing the same way as rectangular OB provides smoothing over a circular OB.

As a standard horn isn't an option for me right now (I encourage everybody to give it a try !) I did some investigation in optimizing the lip with reasonable results – in *FR measurement* at least:


NEO3-W in Gaussian Min Phase horn with optimised lips:

Beautiful Swingin' Speaker



NEO3-W in Gaussian Min Phase horn with straight lips:

Beautiful Swingin' Speaker




sadly these improvements in FR measurement do not correlate with sonic impression.
Or maybe I should put it more precisely – flatter FR here is a trade off to increasing group delay – which is not handled easily with simple passive XO.

Bottom line – the straight cut at the end of the horn sounds really good to me – though it measures not as perfect as I would have liked.


Just for comparison
below the Neo3-PDRW (the one with the two inner felt stripes at each side) in the same Gaussian Min Phase horn with straight lips:

Beautiful Swingin' Speaker




Michael

Last edited by mige0; 25th January 2010 at 09:21 AM.
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Old 25th January 2010, 10:05 PM   #27
Moondog55 is offline Moondog55  Australia
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Default Love it

This is thinking a little outside the box

Great stuff and looks like it was good fun too
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Old 26th January 2010, 02:23 AM   #28
LineSource is offline LineSource  United States
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Quote:
Originally Posted by mige0 View Post
This issue could be treated either in applying the horizontal contour in the vertical direction too making up for a standard horn or by figuring out a lip that provides smoothing the same way as rectangular OB provides smoothing over a circular OB.

Michael
Hi Michael,

Have you sketched out any HORN LIPs which use the contours you have been working on? 90 x 40 constant directivity horns are popular for 1" compression drivers since they mate well with 10" midbass cone speakers.
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Last edited by LineSource; 26th January 2010 at 02:27 AM.
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Old 26th January 2010, 04:20 PM   #29
mige0 is offline mige0  Austria
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Originally Posted by LineSource View Post
Have you sketched out any HORN LIPs which use the contours you have been working on?
I possibly will - once I do a more refined version - but don't hold your breath on that as I might go into other variants first - anyway, its nice balanced in effort versus outcome as it is right now, IMO

Michael
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Old 21st February 2010, 12:47 AM   #30
Inductor is offline Inductor  Portugal
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