Poweraudio Romania - MAP of speaker plans |
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kevinmcdonough
Old Croc Joined: 27 June 2005 Location: Glasgow Status: Offline Points: 3749 |
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Hey
Something that was discussed back when this first came out was adding some very basic specs on for each speaker. Obviously it is always a bit driver dependent, just seeing a very rough idea of usable frequency range for example, in addition to being able to compare the boxes size so effectively, would make the map super useful for quickly seeing what box design may meet your needs. K |
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Mircea Bartic
Old Croc Joined: 18 February 2005 Location: Romania Status: Offline Points: 2581 |
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we are preparing a new complete map of speaker plans from Poweraudio Romania
It will have a lot of new horn designs complete with cutlist. As always we will provide it for free. Most of the plans are ready at this moment. |
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general manager & head designer at nexus-acoustics research
http://www.facebook.com/nexus.acoustics.research Ex Nexus_3 |
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Tigersonics
Registered User Joined: 17 August 2014 Location: Stockport, UK Status: Offline Points: 12 |
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Here you go, these are the MKll version. Good luck with your project!
https://www.freespeakerplans.com/plans/14-plans/basscab/45-punisher-mk2 |
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glenn_2773
New Member Joined: 19 February 2015 Location: php Status: Offline Points: 1 |
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gud am!!can i ask you to activate PUNISHER design?
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patryk1305
Registered User Joined: 13 December 2012 Location: United Kingdom Status: Offline Points: 488 |
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Yeah, they did thanks :)
Sorry I completely forgot to look at the link you sent Maybe one day my "student" budget will allow me to build something similar for testing purposes! Thanks for all the help again
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1647 |
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No worries, hope they went well
Yeah, that's the thread I linked to too Have made it all the way to the end of it now; while there are a couple of fairly vague references to some extra loading from having the port exit within the front chamber, no-one seems to have provided either measured data or much of a theoretical rationale to back it up. (At least for the pics that have survived - due to age and imageshack changing their way of working, maybe some of the many blank/absent ones might have shed a bit more light at the time.) There also seem to be at least as many assertions that it makes no difference, much like my hunch above. Of the folk that actually seem to have built/used any, I'm not sure if Mircea is still active on the forum but Marjan M certainly is, you might try PM'ing him to see if he ever got to the bottom of it. All the best, David.
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patryk1305
Registered User Joined: 13 December 2012 Location: United Kingdom Status: Offline Points: 488 |
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Sorry for taking long to reply but had exams at uni today :)
I actually have no "scientific" references regarding the port ending within then horn itself. I just came across the design, so thought if there are any advantages to that and wanted to sim it. I've found a few previous threads with similar topics; This one starts to get interesting from page 5: CLICK I also found this which was not much help : CLICK I hope that others can chip in and add something to what already has been said as I am really interested |
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1647 |
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OK, fair point, hadn't thought of that. Obviously it still works for any design where the ports extend all the way to the front of the box (PWH-18SW1P etc). Honestly don't know if it makes any difference at all having the port mouth end within the front cavity - as the port output should be restricted to frequencies largely below where the front cavity would have any useful loading (due to the relatively shallow depth of the front cavity) I'd assume none TBH. Do you have any other sources on this loading type that say otherwise? Cheers, D. Edit PS: Tools>Output>Combined...>Path Length Difference might be useful to account for the depth offset in any given design. Edit 2: First 5 pages of This Thread include several references to versions having ports ending within the front chamber sounding worse due to the phase issues. I don't have time to read the rest of it, so I'd still like to hear if you have any other references regarding the effect of the ports ending within the box please?
Edited by DMorison - 20 January 2015 at 11:08pm |
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patryk1305
Registered User Joined: 13 December 2012 Location: United Kingdom Status: Offline Points: 488 |
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I thought that if you do it like that, then the port will not actually be in the "horn" itself?
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1647 |
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Sure, pretty easily. Starting at the back of the box, Vrc & Lrc are exactly as the
plan. If you double click on Fr it changes to Ap (your port cross sectional
area) and then Lpt below it is the length of the port. Vtc and Atc are both
zero. For the part in front of the drivers, S1 is the whole area
of the box (minus any port length projecting in front of the baffle), S2 is
usually exactly the same as that and the segment length is the length from
baffle to front of box. It won’t matter what profile you chose as there’s no
expansion anyway. If the port projects part way into the front section I’d
use S2=S1 = the frontal area minus the port area, then do a really short
segment with S3 = the full frontal area, with say 0.1cm length, then a third segment
with S4=S3 and again, whatever type of expansion is convenient to account for
the rest of the length. HTH, David. |
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patryk1305
Registered User Joined: 13 December 2012 Location: United Kingdom Status: Offline Points: 488 |
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Is it possible to simulate designs like these (mainly Goliath / LSW218) in HornResp or would you need akabak for that?
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shadowsforce
New Member Joined: 28 May 2010 Status: Offline Points: 4 |
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ANCHORFREE_VERSION="633161526"
AWESOME! So Much Thanks For These Great Detailed Plans.
I'm A Newbie At This, And May Sound Stupid To Some Of The More Advanced Users Of This Forum. But I Have A Question That Needs Answered. I Just Acquired (4) JBL 2242H's And Want To Build Dual-18 Boxes Similar To The JBL STX828S, Which Houses These Same Drivers And Claims To Produce Ultra Low Frequencies. I Can't Find X-Ray Plans For This Particular Box, And I'm Completely Lost When It Comes To Software Designing. Which Dual-18 Box Should I Build To Clone The STX828S? All Help Is GReatly Appreciated :)
var _AF2$ = {'SN':'HSSHIELD00US','IP':'77.242.196.26','CH':'HSSCNL000232','CT':'XX','HST':'','AFH':'hss200','RN':Math.floor(Math.random()*999),'TOP':(parent.location!=document.location||top.location!=document.location)?0:1,'AFVER':'2.25','fbw':false,'FBWCNT':0,'FBWCNTNAME':'FBWCNT_MSIE','NOFBWNAME':'NO_FBW_MSIE','B':'i','VER': 'us'};if(_AF2$.TOP==1){document.write("
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