2x12 PPSL anyone?
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Category: Plans
Forum Name: New Projects Forum
Forum Description: Forum for new speakerplans projects, in memory of Tony Wilkes, 1953 - 2014
URL: https://forum.speakerplans.com/forum_posts.asp?TID=55730
Printed Date: 27 March 2026 at 8:46am
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Topic: 2x12 PPSL anyone?
Posted By: pfly
Subject: 2x12 PPSL anyone?
Date 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" rel="nofollow - http://dl.dropbox.com/u/9726318/212pp/212pp.skp |
Replies:
Posted By: VentureSound
Date Posted: 12 August 2011 at 9:05pm
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What's the calculated f3? Looks about 38Hz from the graph? |
Posted By: loonie
Date Posted: 01 September 2011 at 5:46am
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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! ------------- Team DB |
Posted By: pfly
Date Posted: 01 September 2011 at 8:23am
| They are not. Sorry, totally different thing. |
Posted By: MarjanM
Date Posted: 01 September 2011 at 4:58pm
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Need more details. ------------- Marjan Milosevic MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
Posted By: loonie
Date Posted: 01 September 2011 at 5:02pm
*Continues to wait patiently  ------------- Team DB |
pfly wrote:Posted By: pfly
Date Posted: 01 September 2011 at 5:29pm
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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. |
Posted By: pfly
Date Posted: 01 September 2011 at 5:33pm
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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? |
Posted By: _djk_
Date Posted: 01 September 2011 at 10:16pm
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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 |
Posted By: Wrek0ne
Date Posted: 02 September 2011 at 12:05am
Do tell more ...  ------------- Poll this! |
Posted By: pfly
Date Posted: 02 September 2011 at 12:56am
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. |
Posted By: hmaudio
Date Posted: 21 July 2012 at 1:59pm
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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. |
Posted By: Sheggy
Date Posted: 21 July 2012 at 2:28pm
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Nice! I'm a little confused why the efficiency isn't better in your sim of the 2x12 - the BMS neo driver is 97 dB/W so should these not come out a bit louder? Also, how could your design be altered to give a little low extension (but y'ynow it is very good for the size). S |
Posted By: pfly
Date Posted: 21 July 2012 at 4:14pm
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In short; it is not 97dB. In frq range it is usually used, in optimum reflex box it is about 93dB at best. the sim is done with shared one watt between two drivers, so it shows only the gain you could maybe expect from two diaphgrams exciting the same air mass, not from doubled power rating or lower nominal impedance. Put two of these boxes side by side and you begin to reach sensitivity figures of good quality 2x18" box I did not tune it lower because excursion starts getting out of hand. from box that small I'd rather have slight sensitivity increase at 50hz than trying to reach as low as possible and in worst case lose more linearity. Ports could be extended few cm if lower frequencies were wanted. It may come at a cost though.
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Posted By: mykey-
Date Posted: 22 July 2012 at 4:43am
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C4-S long lost brother
------------- BbbBBRAAAAPppBBBBbgushhhhhhhhssshhhhhGrAbRAAAAAAPPPPPp = Dubstep |
Posted By: nomad
Date Posted: 03 August 2012 at 10:54pm
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hi , it remind me design of 18 sound kit dual 18 : http://www.eighteensound.com/staticContent/applications/kits/kit18dual.htm it's push pull , not manifold? ------------- In Bass We Trust!! IBWT!! |
Posted By: Wrek0ne
Date Posted: 21 September 2012 at 10:45pm
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Also what is the 18" horn length? ------------- Poll this! |
Posted By: Wrek0ne
Date Posted: 08 October 2012 at 6:22pm
Did you ever build and test one, I can see that with the extra length in the horn and smoother expansion this would completely outplay the Invader. Do you have any interest in sharing more info about the design? Iv been thinking about squeezing extra horn length into the smaller boxes, 'snail shell' is one of the best way to get the extra length but keeping the expansion smooth. ------------- Poll this! |