Accidental MLTL Technique
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
xrk971
Got Foam?
diyAudio Member

Join Date: Oct 2012
Location: Metro DC area
Quote:
 Originally Posted by picowallspeaker Tremendous changements, uh? Once you diverge from what's inside the disc... properly: an infinitesimally little changement produces an infinite grade of dissociation from what's inside the disc. What's inside the disc is axiomatically unknown
I have no idea what you are talking about here. Perhaps the general idea that mathematically, a change inside an integration boundary cannot be known, even though it causes a large change outside? In the case of a foam core speaker enclosure that vibrates, the effect can be estimated based on the difference between total output vs output from driver and vent.

xrk971
Got Foam?
diyAudio Member

Join Date: Oct 2012
Location: Metro DC area
Quote:
 Originally Posted by Philfr Here the results : Jordan MLTL Phil.
Nice result Phil. I agree that rear facing vent seems best in room boundaries.

Which size vent did you end up with here in these sims?

picowallspeaker
diyAudio Member

Join Date: Apr 2007
Quote:
 Originally Posted by xrk971 I have no idea what you are talking about here. Perhaps the general idea that mathematically, a change inside an integration boundary cannot be known, even though it causes a large change outside? In the case of a foam core speaker enclosure that vibrates, the effect can be estimated based on the difference between total output vs output from driver and vent.
Sorry for mixing or going OT, no ,well, it's still in thread
I meant that everything should be done with the intention of having the maximal intensity perceived by the listener. Talking about the speakers and not the entire system or room, or even about the disc content, the goals are...
wait: what speaker ? We were talking about procedures .
The major issue is the 'covering effect' that happens during reproduction.
It's the sound originated by, somehow, somewhere that overimposes on the
original ( which is not known) one; we could know the amount of it, or verify
how much it can differ ....
So it's not that easy; sorry again to be so pedantic
We're not talking about a ceiling speaker at the supermarket, you know...those diabolic things that inject in your brain those stupid jingles.
I had in mind the answer why it could be nice to hear those things that you made in the cornu thread...but, yes, if referring to a 10cm driver left alone to guvern under avverse conditions, in storm and rain

 17th March 2013, 03:21 PM #104 Philfr   diyAudio Member   Join Date: Dec 2012 Rport is 3 cm.. Little dips and holes between 700 and 1000 hz is create by lenght of port. With smaller value (under 14 cm), we have not, it's a straight line. Phil.
xrk971
Got Foam?
diyAudio Member

Join Date: Oct 2012
Location: Metro DC area
Quote:
 Originally Posted by Philfr Rport is 3 cm.. Little dips and holes between 700 and 1000 hz is create by lenght of port. With smaller value (under 14 cm), we have not, it's a straight line. Phil.
Is Rport the radius or diameter of the vent?

Bill poster
diyAudio Member

Join Date: Jun 2008
Location: Bangkok/London
Quote:
 Originally Posted by xrk971 Here is what I came up with: 16 liter vol with WinISD BR tuning at 44 Hz. Accidental MLTL design gives based on assumed 40 in pipe and 6 in baffle width. L=40 in Width = 6.0 in Depth = 4.0 in Vent dia = 2.0 in (round) Vent Length = 6.1 in (downward firing) Zdriver= place at 13 in from top or near top ~5 in for good height close to ear. Stuffing in top 26 in of line.
one thing i don't understand, how did you come to a 40 in line length? My calculation wd be much longer

 17th March 2013, 07:17 PM #107 Philfr   diyAudio Member   Join Date: Dec 2012 >> Is Rport the radius or diameter of the vent? R is radius.. Phil.
 17th March 2013, 08:35 PM #108 xrk971   Got Foam? diyAudio Member     Join Date: Oct 2012 Location: Metro DC area Practical consideration to get it higher up to ear level and not too long that it will tip over easily. Also, I have built them at 40 in before and it seems to work. It turns out to be about same as what others who designed it with MJK ended up using. If you make it too long, that is close to quarter wave length for fb, the mass loading will drive fb too low, below what driver may be able to do.
 17th March 2013, 09:11 PM #109 Bill poster   diyAudio Member     Join Date: Jun 2008 Location: Bangkok/London bit confused, the line length or cabinet 40 inches in height (or both)? I would always 'fold' and the baffle can be angled by a degree or 2 if needed I assumed a line frequency length just above the resonant frequency value of said drive unit was correct, same as a standard TL but maybe around 10% extra as its tapered/flared Last edited by Bill poster; 17th March 2013 at 09:23 PM.
 17th March 2013, 09:19 PM #110 xrk971   Got Foam? diyAudio Member     Join Date: Oct 2012 Location: Metro DC area You can fold but if you tune length close to just above fs of driver you do not need to mass load. The mass loading achieves both reduced line length and provides more filtering of output peaks and valleys by low pass filtering output from line. The length as I have said is mostly based on seeing other MLTL designs and their lengths.

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Site     Site Announcements     Forum Problems Amplifiers     Solid State     Pass Labs     Tubes / Valves     Chip Amps     Class D     Power Supplies     Headphone Systems Source & Line     Analogue Source     Analog Line Level     Digital Source     Digital Line Level     PC Based Loudspeakers     Multi-Way     Full Range     Subwoofers     Planars & Exotics Live Sound     PA Systems     Instruments and Amps Design & Build     Parts     Equipment & Tools     Construction Tips     Software Tools General Interest     Car Audio     diyAudio.com Articles     Music     Everything Else Member Areas     Introductions     The Lounge     Clubs & Events     In Memoriam The Moving Image Commercial Sector     Swap Meet     Group Buys     The diyAudio Store     Vendor Forums         Vendor's Bazaar         Sonic Craft         Apex Jr         Audio Sector         Acoustic Fun         Chipamp         DIY HiFi Supply         Elekit         Elektor         Mains Cables R Us         Parts Connexion         Planet 10 hifi         Quanghao Audio Design         Siliconray Online Electronics Store         Tubelab     Manufacturers         AKSA         Audio Poutine         Musicaltech         Holton Precision Audio         CSS         exaDevices         Feastrex         GedLee         Head 'n' HiFi - Walter         Heatsink USA         miniDSP         SITO Audio         Twin Audio         Twisted Pear         Wild Burro Audio

 Similar Threads Thread Thread Starter Forum Replies Last Post sprinter Music 32 21st October 2013 06:22 AM aspringv Solid State 13 22nd July 2012 09:38 AM Waterdog Introductions 9 23rd January 2012 06:31 PM InfiniteGain Analogue Source 5 30th January 2009 10:11 PM

 New To Site? Need Help?

All times are GMT. The time now is 09:55 PM.