.

Good, like i said, never seen the inside I'm just guessing. I was impressed with the ones I've heard so thought i would see if i could come up with something similar. its a series-tunes bandpass / horn hybrid. The bandpass part is easy enough to design and so is the horn but i have no idea how they would work together. hopefully someone could point me in the right direction?

something nice and complicated for when i cant sleep at 7 in the morning!

Thanks Johan. i've never used Akabak though, everything i've done so far has been with winisd, bassbox pro and hornresp (still trying to get my head around hornresp tbh). maybe its something i should look at before attempting this. still relatively new to speaker design in general too but i think im picking it up quite quickly.

this is what i have so far, different internal ports though.

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

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

Looks very "X" 
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)

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

staiper wrote: 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

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