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2x12 PPSL anyone?
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pfly View Drop Down
Old Croc
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    Posted: 12 August 2011 at 5:53pm
Some time ago I sketched slot loaded push & pull design for two BMS 12S330/12N630. Around 70-75 litres tuned to 38hz, at least should be. Slot is just big enough to load those drivers with some 9mm between them when loading. Structure is pretty much self bracing with driver baffles and ports, extra bracing should not create two different chambers. Feel free to try if you're brave enough. Excursion hits 10mm with 1000 watts at 50hz




predicted 2pi / 2v / 4ohm without slight gain/filter in upper bass that slot may cause


http://dl.dropbox.com/u/9726318/212pp/212pp.skp



Edited by pfly - 12 August 2011 at 5:58pm
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VentureSound View Drop Down
Young Croc
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Points: 950 		Post Options Post Options   Thanks (0) Thanks(0)   Quote VentureSound Quote  Post ReplyReply Direct Link To This Post Posted: 12 August 2011 at 9:05pm
What's the calculated f3? Looks about 38Hz from the graph?

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loonie View Drop Down
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Am I right in saying these are the "extended/doubled" 12" Hybrid Horn plans?

If so, you've made me a very happy man indeed.

Many thanks Pfly!


Edited by loonie - 01 September 2011 at 5:47am
Team DB
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pfly View Drop Down
Old Croc
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They are not. Sorry, totally different thing.
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MarjanM View Drop Down
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Need more details. 
Marjan Milosevic
MM-Acoustics
www.mm-acoustics.com
https://www.facebook.com/pages/MM-Acoustics/608901282527713
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loonie View Drop Down
Old Croc
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Originally posted by pfly pfly wrote:

They are not. Sorry, totally different thing.


*Continues to wait patiently Smile
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pfly View Drop Down
Old Croc
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Sketchup is free software, anyone who wants to try out this design can download it and measure plans from the .skp

I am not sure if I ever release 2x12" hybrid design. I have moved on from there.
Concept seems to be working nicely. I am working on 2x15" version that shares many aspects with Martin 215 mk3 and F2B, on pure coincidence looks pretty much like Martin MLX and is almost exactly the same size as Arcline X. I tell you, without space age materials of Arcline X it is amazingly tight fit to cram horns, ported chambers and 2x15" drivers into that space.
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pfly View Drop Down
Old Croc
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Points: 2828 		Post Options Post Options   Thanks (0) Thanks(0)   Quote pfly Quote  Post ReplyReply Direct Link To This Post Posted: 01 September 2011 at 5:33pm
Another thing: would anyone be interested in Psycho bin sized Front Loaded Horn meant for usual suspects, PD.1850 and V18-1000 with 230cm horn path and Martinesque letterbox -throat?
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_djk_ View Drop Down
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"Continues to wait patiently"
 
If you liked the performance graph for the posted design, why not build the design?
 
It will go lower than a similar sized horn, and have less distortion.
djk
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Originally posted by pfly pfly wrote:

Another thing: would anyone be interested in Psycho bin sized Front Loaded Horn meant for usual suspects, PD.1850 and V18-1000 with 230cm horn path and Martinesque letterbox -throat?


Do tell more ... Big smile
Poll this!
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pfly View Drop Down
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Here it goes...




PD.1850 0,5pi / 1,41v and 2pi / 2,83v

Dimensions are 122x84x63,6cm

Nice smooth folding and expansion. Models around the same as Nineleave's Invader but in reality it has more horn length and to my eyes perhaps nicer expansion. Different character it will definitely have. I am also sucker for Martin's letterbox throat because it creates definitive throat such as compression drivers and mid horns have and it almost minimizes the size of compression chamber, it really makes horn act as a horn in most classic way.

Problem is it either need side access panels like LAB and Punisher or then something like I drew in that model and what Mykey did in one of his designs.
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hmaudio View Drop Down
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[QUOTE=pfly]Here it goes...




PD.1850 0,5pi / 1,41v and 2pi / 2,83v

Dimensions are 122x84x63,6cm

Nice smooth folding and expansion. Models around the same as Nineleave's Invader but in reality it has more horn length and to my eyes perhaps nicer expansion. Different character it will definitely have. I am also sucker for Martin's letterbox throat because it creates definitive throat such as compression drivers and mid horns have and it almost minimizes the size of compression chamber, it really makes horn act as a horn in most classic way.

Problem is it either need side access panels like LAB and Punisher or then something like I drew in that model and what Mykey did in one of his designs.
[/QUOTE/

more info on this please it looks very promising! did you ever take this any thurveR? 

cheers
Adam
Nottingham based cab builder. https://www.facebook.com/HMAudio-154352667920145/?ref=bookmarks
This account is used by 2 people.
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