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Single 21" reflex plans?

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krazyneil View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote krazyneil Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2017 at 9:14pm
I think tony did a Q21 for somebody might be worth asking bee if he still has the plans
GOD TOLD ME TO DO IT !!!!!
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Father-Francis View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Father-Francis Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2017 at 9:05pm




So some 21" Pd's landed from Andy , prototype box cut and am putting it together
Ready for testing from Sunday , will let you know how it sounds .
Music is the strongest form of magic.(+45 31879997)blakmanpro@gmail.com
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Father-Francis Quote  Post ReplyReply Direct Link To This Post Posted: 11 February 2017 at 7:13pm

So will be testing tomorrow, will keep you updated
Music is the strongest form of magic.(+45 31879997)blakmanpro@gmail.com
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AndersB View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AndersB Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2017 at 10:09am
I have built a total of 12 boxes, using 21" drivers ,,,, but a little higher and deeper than  60 60 60 ..... 

= 61 wide, 90 height, to make room for long bottom ports, and 73 deep, for added volume, and better internal ratio (no square design, of inside measurements.)

construction foam and bitumen sheets inside as dampening. two round ports at 20cm diameter.

They can be a bit smaller, in volumen, but i would also say 60 60 60 is too small, considering ports should be (very) large....

I used 18mm birch plywood, with dual front 36mm,,,  .... and one crosssection of 3 stiffeners going from front/back - top/bottom - and side/side, meeting in the middle ....



Accoustically, when i put the setup as 2x4 boxes, they are able to play so deep, that your stomach really turns, hard to describe otherwise, i have not heard anything like it... i used 4 amps at 2500w (4000w peak), 4 ohm. and a record player! ... digital songs dont play as deep...

the force of 21" inch really shows in this ported design...: A 18" driver would not be able to go higher than 400-500 w, due to excursion limits - it's around 13-15 mm at this power lvl, when you look at excursion around the 30 Hz ....  meaning a 18" ported design really is meaningless for highest output. ...  --- when 21" is used, excursion max is more like 1300-1500 watts at 30 hz ...


only drawback to using 21", is that the big enclosure, makes the box have a rather long echo, so i cant play the higher end bass (100-120 hz) very precisely... (compared to e.g. a tight punch from a 15" JBL 2226) ... but if highest and deepest possible bass output is required, you are on the right track. --- nothing compares to 21" port reflex :))


https://www.dropbox.com/sc/1cwipl3we6gdjsv/AACErnbIkQWkSpc_A21pykz1a
https://www.dropbox.com/s/9temmlasmlpdr11/2013-10-22%2020.36.08.jpg?dl=0
https://www.dropbox.com/sc/bk8ojpwoc2xykvq/AAB-h6gbji1Z-qTLyPyg9Xaaa
https://www.dropbox.com/sc/9v3b2h3fwztt90x/AAAccqLvx1HMovEAQ8A-a4uia
https://www.dropbox.com/sc/u7v3gw2uckk02ui/AAA3Yx_QBI3j5bHK66j7jdLra
https://www.dropbox.com/s/dju4oxy1xl0lx9p/IMG_20170213_113914.jpg?dl=0


1:1 wave / full range horn - low-cut-off 69Hz (=> flat to 75-80 hz)... : 
https://www.dropbox.com/s/m5o5f8t40q0zs3y/2013-04-30%2018.55.29.jpg?dl=0
https://www.dropbox.com/sc/8cg55rf1iqbg812/AACEvkEcpcco7uX5lyqvwRjEa
https://www.dropbox.com/sc/ijl74ifg1j2zf8v/AACvjHJ-ewPXsCl7d3oz2F9Ka
https://www.dropbox.com/s/jplinwcc41zno51/11892146_10155995361270574_2751972599658977769_n%20%281%29.jpg?dl=0


...the top four is flipped upside down, when playing :) ...: 
https://www.dropbox.com/sc/y2z1ai6sqon0cg4/AADIIyPKVfxOswi-Lr0yvw44a



Edited by AndersB - 13 February 2017 at 11:42am
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Father-Francis View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Father-Francis Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2017 at 10:59am
Originally posted by AndersB AndersB wrote:

I have built a total of 12 boxes, using 21" drivers ,,,, but a little higher and deeper than  60 60 60 ..... 

= 61 wide, 90 height, to make room for long bottom ports, and 73 deep, for added volume, and better internal ratio (no square design, of inside measurements.)

construction foam and bitumen sheets inside as dampening. two round ports at 20cm diameter.

They can be a bit smaller, in volumen, but i would also say 60 60 60 is too small, considering ports should be (very) large....

I used 18mm birch plywood, with dual front 36mm,,,  .... and one crosssection of 3 stiffeners going from front/back - top/bottom - and side/side, meeting in the middle ....



Accoustically, when i put the setup as 2x4 boxes, they are able to play so deep, that your stomach really turns, hard to describe otherwise, i have not heard anything like it... i used 4 amps at 2500w (4000w peak), 4 ohm. and a record player! ... digital songs dont play as deep...

the force of 21" inch really shows in this ported design...: A 18" driver would not be able to go higher than 400-500 w, due to excursion limits - it's around 13-15 mm at this power lvl, when you look at excursion around the 30 Hz ....  meaning a 18" ported design really is meaningless for highest output. ...  --- when 21" is used, excursion max is more like 1300-1500 watts at 30 hz ...


only drawback to using 21", is that the big enclosure, makes the box have a rather long echo, so i cant play the higher end bass (100-120 hz) very precisely... (compared to e.g. a tight punch from a 15" JBL 2226) ... but if highest and deepest possible bass output is required, you are on the right track. --- nothing compares to 21" port reflex :))

hvor er du fra, er du fra havnen
Music is the strongest form of magic.(+45 31879997)blakmanpro@gmail.com
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AndersB Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2017 at 11:11am
oprindelig fra Herlev :) ,,, har boet på nørrebro i ca 10.... Vi hilste helt kort på hinanden, inde på stengade,,, for ca. 6-7 år siden ca,,, tiden går... :)

højtalerne står lidt stille for tiden, men dejligt der sker noget :) ... de 8 af dem er solgt. har fire tilbage, som måske kommer ud og lufter til sommer....

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Father-Francis View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Father-Francis Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2017 at 11:18am
jeg bor ved forum, we should hook up boss
Music is the strongest form of magic.(+45 31879997)blakmanpro@gmail.com
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AndersB View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AndersB Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2017 at 11:49am
Fedt... Det vil jeg gerne ... de sidste 3 højtalere er kun 90 pct færdige, så det kunne være en god lejlighed til at få de sidste klar, og jeg har pt kun 1 digi amp, (med dsp) ...

Jeg kan smide noget af det på en trailer, så kan vi høre det? ... du kan bare skrive når det passer dig. no rush fra min side i hvert fald :)


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audiomik View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote audiomik Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2017 at 12:13pm
Originally posted by krazyneil krazyneil wrote:


I think tony did a Q21 for somebody might be worth asking bee if he still has the plans


Have full set of plans for the Q21 but will need time to extract them from an old PC.

Otherwise do a search on here for Q21 as there is a dedicated thread on it

Mik
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bee View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bee Quote  Post ReplyReply Direct Link To This Post Posted: 14 February 2017 at 8:34pm
@ Audiomik, the plans have been taken out of the public domain, I'm still happy to give them away, as long as a donation is made to the british heart foundation in Tonys Memory... the q21 plans were only ever shared to a very few people, to my knowledge the only ones every built were the ones muckerbarns had cnc cut. These were then sold and I have them in the workshop. Ill get some pics posted.
https://www.elements-audio.com
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bee View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bee Quote  Post ReplyReply Direct Link To This Post Posted: 14 February 2017 at 8:43pm
this is a pic of the current 21" reflex cabs I'm running. Something I knocked up....
 
https://www.elements-audio.com
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Post Options Post Options   Thanks (0) Thanks(0)   Quote patryk1305 Quote  Post ReplyReply Direct Link To This Post Posted: 14 February 2017 at 9:45pm
Originally posted by bee bee wrote:

this is a pic of the current 21" reflex cabs I'm running. Something I knocked up....
 

Bet they shift some air LOL What drivers are those?
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