Not another bleeding omni FFS!

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Cressy Snr
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#1 Not another bleeding omni FFS!

Post by Cressy Snr »

:|
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#2 Re: Not another bleeding omni FFS!

Post by IslandPink »

What are you doing next ... what's in the pipeline ... ? :)
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#3 Re: Not another bleeding omni FFS!

Post by pre65 »

It will save me having to go to HFS to keep up with your excellent work. :)
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#4 Re: Not another bleeding omni FFS!

Post by Cressy Snr »

IslandPink wrote: Mon Jul 17, 2017 10:13 pm What are you doing next ... what's in the pipeline ... ? :)
Well apart from sitting here listening to my flabby arsed, sucked out, limp-wristed, weedy little, spray sound anywhere except at the listener, loudspeakers, there is something else "stirring in the undergrowth" :wink:
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#5 Re: Not another bleeding omni FFS!

Post by pre65 »

The one with the 12" driver looks interesting. More so because I have a couple of 12" units in the loft waiting for a home. :)
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#6 Re: Not another bleeding omni FFS!

Post by Cressy Snr »

pre65 wrote: Mon Jul 17, 2017 10:30 pm The one with the 12" driver looks interesting. More so because I have a couple of 12" units in the loft waiting for a home. :)
Those are a bit of a comedown from your 18" dustbin lids Phil :lol:
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#7 Re: Not another bleeding omni FFS!

Post by pre65 »

Cressy Snr wrote: Mon Jul 17, 2017 10:32 pm
pre65 wrote: Mon Jul 17, 2017 10:30 pm The one with the 12" driver looks interesting. More so because I have a couple of 12" units in the loft waiting for a home. :)
Those are a bit of a comedown from your 18" dustbin lids Phil :lol:
Who knows Steve ?

Got to keep busy over the winter. :lol:
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#8 Re: Not another bleeding omni FFS!

Post by Cressy Snr »

OK!
The idea is a semi omni, once more based on the work of the late great Roy Allison. I am flying in the face of the modern way of presenting a loudspeaker. It is wider than deep, in the grand tradition of the 50s, 60s and 70s and uses sealed box (infinite baffle) loading.
Designed to be flat against a wall, ie domestically acceptable.

Image

The speaker comes in two parts; a top sealed cabinet, containing the up-firing midrange and front firing tweeter. This sits atop a 3 cubic foot bass box, again sealed and appropriately braced, with an LF driver, coupled to the floor boundary.

Takes me back to my speaker designing youth (oh the nostalgia) :D

Cables enter at the bottom of the bass box, with connections to the top cabinet made with an umbilical and Neutrik connectors.
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#9 Re: Not another bleeding omni FFS!

Post by Cressy Snr »

Here's a fun, retro possibility for them:

Image
All Rexine and Tygan at the front. :mrgreen:
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#10 Re: Not another bleeding omni FFS!

Post by Nick »

Rexine and Tygan
Isn't that the names Beyoncé gave to her twins?
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#11 Re: Not another bleeding omni FFS!

Post by Cressy Snr »

Should have been. :D
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#12 Re: Not another bleeding omni FFS!

Post by shane »

Given that these are omnis, would there be any advantage to putting them on short legs and firing the bass unit downwards?
The world looks so different after learning science. For example, trees are made of air, primarily. When they are burned, they go back to air, and in their flaming heat is released the flaming heat of the Sun which was bound in to convert air into tree.
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#13 Re: Not another bleeding omni FFS!

Post by Cressy Snr »

That's one possibility. The Larson Pyramid fired its 8" bass driver at the floor. Only problem with that is that using a bass driver firing downwards instead of a just a port, means you are slot loading it by a gap governed by the length of the legs, which is another can of worms.

It's certainly possible. Most separate subs use the down-firing method to shake the floorboards. :D
Whether you'd want to shake the floor depends on your tastes.
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#14 Re: Not another bleeding omni FFS!

Post by Cressy Snr »

8 ohm, 10 inch bass driver under test with 2nd order, low pass filter at about 180Hz -3dB

Image

I also tested a Doc modded 12 inch driver a few days ago.
Nice even responses from the both of them in free air.
The pair of them can shift plenty of air, that's for sure.
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#15 Re: Not another bleeding omni FFS!

Post by IslandPink »

Ah, sealed - very good !
Which is the 10" bass driver ?
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