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darkmatter View Drop Down
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    Posted: 08 February 2010 at 12:55pm
Yeah I thought you would have meant it like that mate, I just meant that as soon as you start tweaking the layout above the lengths and therefore the alignment would change. Def the best way to go about it though I reckon.
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mykey View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mykey Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2010 at 4:39pm
Originally posted by darkmatter darkmatter wrote:

Mykey - I think that'd be a great way to do it and would allow you to tweak the tuning as required. However, the difficulty is working out a way to do it that's tweakable while still keeping the port output aligned with the horn mouth, as it seems the crucial bit in this sort of design is the phase alignment between port output and horn output.
don't take the sketch  literally, you can bend the whole thing into a 'U' shape, so the port ends up in line with the horn mouth

 


Edited by mykey - 05 February 2010 at 4:58pm
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char355 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote char355 Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2010 at 3:22pm
I'm sure they have nothing to worry about.

brilliant idea mykey.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote subbass Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2010 at 2:31pm
looks a bit stasys Xish to me Tongue
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darkmatter View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote darkmatter Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2010 at 1:10pm
Mykey - I think that'd be a great way to do it and would allow you to tweak the tuning as required. However, the difficulty is working out a way to do it that's tweakable while still keeping the port output aligned with the horn mouth, as it seems the crucial bit in this sort of design is the phase alignment between port output and horn output.
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mykey View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mykey Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2010 at 11:25am
Originally posted by staiper staiper wrote:

Originally posted by mykey mykey wrote:

did you do the cabinet like a schematic layout staiper?


Not .. same system (front horn + two chambers - serial tuned , like on that schematic) but different internal folding / chamber volumes.  .. not big philosophy , theory is same Big smile
No, I meant build it on a bench with a schematic layout like this

....easier? harder? more fun?

then the best part is fitting it in to the space required, IE: cabinet


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char355 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote char355 Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2010 at 11:14am
was just thinking about going to get some chipboard to mess around with, but oh yea, i need some drivers too! might see what i can do with some 15s without changing it too much.
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staiper View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote staiper Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2010 at 11:11am
Originally posted by mykey mykey wrote:

did you do the cabinet like a schematic layout staiper?


Not .. same system (front horn + two chambers - serial tuned , like on that schematic) but different internal folding / chamber volumes.  .. not big philosophy , theory is same Big smile
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mykey View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mykey Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2010 at 10:53am
did you do the cabinet like a schematic layout staiper?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote staiper Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2010 at 10:46am
Looks very "X" Smile
I have tested one with similar system but a bit different folding schema  (but single driver version, chipboard - for test only)
Works like charm, SPL+ depth + rapid kick .
Thought that cabinet is pretty messy for DIY-ing.
Planned to test double version (all panels already cut prepared out of 15mm ply .. but unfortunately no more adequate 18" drivers for test .. so to will wait some better times as pile of panels :)

In my opinion those are nice hybrid of FLH and DTBR-s ...gives excellent "one compact bass box for all" solution.  However if space/stacking is not problem big stack of standard horns will give you ~ same extension and higher SPL .. but than tradeoff is size.

Those hybrids seems to give nice LF extension and superb kick even from single pretty compact cabinet. Ofcourse , stacking in multiples will improve thing even more (but not as much as standard horns benefit in big stack)


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char355 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote char355 Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2010 at 9:58am
Thanks. I'm playing around with making the rear chamber larger but don't want to make the horn shorter or the overall size larger. think I'm in over my head with this design though, I'm still learning a lot of the basics. maybe someone else might be interested in the design and do some work for me! Wink
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mobiele eenheid View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mobiele eenheid Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2010 at 9:41am

Def_Const
{
S1  =      555e-4; 
S2  =     4200e-4; 

L12 =       90e-2; 

Vtc =    40000e-6;
Atc =     2550e-4;

Vrc =      165e-3;
Lrc =       30e-2; 

Lpt =       15e-2;
Ap  =      555e-4; 

Vpc =       55e-3;
Lpc =       12e-2;

Lpt2 =      25e-2;
Ap2  =     555e-4; 

|Parameter Conversions:

Sd  = 1225.00e-4; 

Arc = Vrc / Lrc;

Apc = Vpc / Lpc;

Ltc = Vtc / Atc;
}
|=====================================================================================

|Network node numbers for this horn-loaded vented-box system:

|                                                                     0-Voltage-1
|                                                                                      |
|Radiator(1)-99-Port-2-Chamber-3-Port-4-Chamber-5-Driver-6-Chamber-7-Segment-8-Radiator(2)

|=====================================================================================

Def_Driver 'Driver'
  Sd=1225.00cm2
  Bl=24.73Tm
  Cms=1.39E-04m/N
  Rms=4.89Ns/m
  fs=31Hz 
  Le=2.30mH
  Re=5.00ohm
  ExpoLe=1

System 'System'
  Driver Def='Driver''Driver'
    Node=1=0=6=5
  Radiator 'Port outlet'
    Node=99
    SD={Ap2}
    Label=1
  Duct 'Port tube 1'
    Node=3=4
    SD={Ap}
    Len={Lpt}
    Visc=0
  Duct 'Rear chamber 1'
    Node=4=5
    SD={Arc}
    Len={Lrc}
    Visc=0
  Duct 'Throat chamber'
    Node=6=7
    SD={Atc}
    Len={Ltc}
    Visc=0
  Waveguide 'Horn segment 1'
    Node=7=8
    STh={S1}
    SMo={S2}
    Len={L12}
    Conical
  Radiator 'Horn mouth'
    Node=8
    SD={S2}
    Label=2
 Duct 'Port Chamber'
    Node=2=3
    SD={Apc}
    Len={Lpc}
    Visc=0
  Duct 'Port tube 2'
    Node=99=2
    SD={Ap2}
    Len={Lpt2}
    Visc=0

 
With the script highlighted: Sum: Acoustic Pressure: In these tabs, voltage 2,83 V for 1W/1m, showing phase gives a good idea of the final tuning.
 
With the script highlighted: Inspect: Excursion: In these tabs, select driver (diaph) driver, range ordinate say 0 - 2,5 cm and 90 V input voltage roughly equals 1000 W (into 8 ohm, see Hornresp guide in the newby-section for details).
 
Best regards Johan


Edited by mobiele eenheid - 05 February 2010 at 9:51am
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