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Old 20th June 2010, 11:51 PM   #11
Sheldon is offline Sheldon  United States
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Quote:
Originally Posted by Patrick Bateman View Post
[center]Click the image to open in full size.
I was thinking something a little different (maybe). Hard to tell, but that waveguide looks to be less than 90 degrees. I envisioned that the waveguide has an insert at the apex, that fits into the compression driver mouth, and swages it down from 90 to say 60 degrees. In this way, the midrange cone does not form part of the waveguide. It is instead radiating into a separate chamber that has entry holes into the waveguide, ala Unity style. This would allow the entry holes to be placed near the apex. Of course a more elaborate tapped horn setup could be used too.

Sheldon
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Old 21st June 2010, 12:25 AM   #12
soho54 is offline soho54  United States
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It's like this:
Click the image to open in full size.

86 are the ports from the Mid Chamber into the waveguide.

Last edited by soho54; 21st June 2010 at 12:28 AM.
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Old 21st June 2010, 06:14 AM   #13
soho54 is offline soho54  United States
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This is the WIP Akabak script I have going. It is built off of Mavo and JLH's old Unity scripts. It follows the tree I put up in post #10.

All inputs are placeholders, but it should streamline working them out. Maybe.

The makeup of the coaxial is in question, so there may be another chamber to add on the compression side. Also, I do not know if the Low Driver taps are tapered. They don't appear to be, but if they are the ducts will have to be switched to WGs. NBD.

Seems sound to me, but I have been looking at it for too long.

System 'Trial A'

Def_Driver 'CompDriver' | (temp)BMS 4552ND compression driver
Sd=15.52cm2
Bl=6.21Tm
Cms=140E-06m/N
Rms=0.40Ns/m
Fs=850Hz
Le=0.09mH
Re=6.20ohm
ExpoLe=0.618


Def_Driver 'MidDriver' |(temp)Misco Speakers Model KCN5FD 5" mid

Sd=63.62cm2
Bl=5.85Tm
Cms=1.28E-03m/N
Rms=0.27Ns/m
fs=101.336Hz
Le=0.42mH
Re=7.2ohm
ExpoLe=0.618


Def_Driver 'LowDriver' |(possible:check parameters)Faital Pro Model 8PR200 8" woofer

Sd=199.0cm2
Bl=17.11Tm
Cms=0.21E-03m/N
Rms=0.27Ns/m
fs=70.0Hz
Le=0.55mH
Re=5.1ohm
ExpoLe=0.618


Def_Const | Unit is cm
{
Mc_Len=0.865e-2; | Front Mid Chamber length
Mc_Dia=9.0e-2; | Front Mid Chamber diameter
Mp_Len=0.635e-2; | Mid Chamber Port length
Mp_Dia=1.38e-2; | Mid Chamber Port diameter

Lc_Len=1.5; | Front Low Chamber length
Lc_Dia=1.9; | Front Low Chamber diameter
Lp_Len=.2; | Low Chamber Port length
Lp_Dia=2; | Low Chamber Port diameter

Encl_Len=25; | Low Driver Enclosure length
Encl_Vol=10; | Low Driver Enclosure volume (liters)
Encl_Area = Encl_Vol / Encl_Len;


Rt_Len=5; | Low Rear Tap length
Rt_Dia=2.5; | Low Rear Tap diameter


Rg=0.08e-0; |Amplifier output impedance (ohms)


CD_XO = .5; |Comp Driver Crossover

MD_XO = 11.8e-6; |Mid Driver Crossover

LD_XO = 1.0e-3; |Low Driver Crossover


S1 = 1.552e-4; |WG1 throat area Waveguide Bridge(sq cm)
S2 = 5.07e-4; |WG1 mouth area and horn segment 2 throat area Mid Chamber Tap point(sq cm)
S3 = 99.01e-4; |WG2 mouth area and horn segment 3 throat area Low Chamber Tap point(sq cm)
S4 = 1038.48e-4; |WG3 mouth area and horn segment 4 throat area Rear Tap point(sq cm)
S5 = 2141.93e-4; |WG4 mouth area and horn segment 5 throat area Horn Mouth(sq cm)


L12 = 2.25e-2; |WG1 axial length(cm)
L23 = 7.0e-2; |WG2 axial length(cm)
L34 = 20.25e-2; |WG3 axial length(cm)
L45 = 7.93e-2; |WG4 axial length(cm)


CDRC_Vol = 0.08e-3; |Comp Driver Rear chamber volume (litres)
CDRC_Len = 0.84e-2; |Comp Driver Rear chamber average length (cm)
CDTC_Vol = 0.75e-6; |Comp Driver Throat chamber volume (cc)
CDTC_Area = 15.52e-4; |Comp Driver Throat chamber cross-sectional area (sq cm)

CDRC_Area = CDRC_Vol / CDRC_Len; |Conversions for CompDriver
CDTC_Len = CDTC_Vol / CDTC_Area;
}
Driver 'D1' Def='CompDriver' Node=10=0=51=52

Duct 'CompRearChamber' |Comp Driver rear compression chamber
Node=50=51
SD={CDRC_Area}
Len={CDRC_Len}
Visc=0

Duct 'CompFrontChamber' |Comp Driver front throat chamber
Node=52=110
SD={CDTC_Area}
Len={CDTC_Len}
Visc=0


Enclosure 'E2' Node=60 Vb=1.8L Lb=5cm

Driver 'D2' Def='MidDriver' Node=0=20=60=61

Duct 'Mid_Chamber' Node=61=62 dD={Mc_Dia} Len={Mc_Len}

Duct 'Mid_Port1' Node=62=120 dD={Mp_Dia} Len={Mp_Len}

Duct 'Mid_Port2' Node=62=120 dD={Mp_Dia} Len={Mp_Len}

Duct 'Mid_Port3' Node=62=120 dD={Mp_Dia} Len={Mp_Len}

Duct 'Mid_Port4' Node=62=120 dD={Mp_Dia} Len={Mp_Len}


Duct 'E3' Node=70=81 SD={Encl_Area} Len={Encl_Len} |Low Drivers Rear Enclosure

Duct 'Rear_Tap1' Node=81=140 dD={Rt_Dia} Len={Rt_Len}

Duct 'Rear_Tap2' Node=81=140 dD={Rt_Dia} Len={Rt_Len}

Duct 'Rear_Tap3' Node=81=140 dD={Rt_Dia} Len={Rt_Len}

Duct 'Rear_Tap4' Node=81=140 dD={Rt_Dia} Len={Rt_Len}

Driver 'D3a' Def='LowDriver' Node=30=31=70=71

Duct 'Low_ChamberA' Node=71=73 dD={Lc_Dia} Len={Lc_Len}

Duct 'Low_PortA1' Node=73=130 dD={Lp_Dia} Len={Lp_Len}

Duct 'Low_PortA2' Node=73=130 dD={Lp_Dia} Len={Lp_Len}

Driver 'D3b' Def='LowDriver' Node=31=0=70=72

Duct 'Low_ChamberB' Node=72=74 dD={Lc_Dia} Len={Lc_Len}

Duct 'Low_PortB1' Node=74=130 dD={Lp_Dia} Len={Lp_Len}

Duct 'Low_PortB2' Node=74=130 dD={Lp_Dia} Len={Lp_Len}


Resistor 'Amplifier Rg' |Amplifier output impedance
Node=1=2
R={Rg}

Resistor 'CD_XO'
Node=2=10
R={CD_XO}

Capacitor 'MD_XO'
Node=2=20
C={MD_XO}

Coil 'LD_XO'
Node=2=30
L={LD_XO}


Waveguide 'WG1'
Node=110=120
STh={S1}
SMo={S2}
Len={L12}
Conical

Waveguide 'WG2'
Node=120=130
STh={S2}
SMo={S3}
Len={L23}
Conical

Waveguide 'WG3'
Node=130=140
STh={S3}
SMo={S4}
Len={L34}
Conical

Waveguide 'WG4'
Node=140=150
STh={S4}
SMo={S5}
Len={L45}
Conical

Radiator 'Horn mouth'
Node=150
SD={S5}
x=0
y=0
z=0
HAngle=0
VAngle=0

Last edited by soho54; 21st June 2010 at 06:35 AM.
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Old 21st June 2010, 04:13 PM   #14
soho54 is offline soho54  United States
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You will want to add the "e-2" back to length/diameter, and "e-3" to volume in the woofer section. Don't know where it went to in this version.

It was late.

You may also want to use SD instead of dD in some of the ducts. I didn't feel to compelled to get to super user friendly with it at this point.

Last edited by soho54; 21st June 2010 at 04:19 PM.
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Old 21st June 2010, 04:36 PM   #15
Sheldon is offline Sheldon  United States
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Quote:
Originally Posted by soho54 View Post
It's like this:
Click the image to open in full size.

86 are the ports from the Mid Chamber into the waveguide.
Thanks. That's what I thought from the diagram, but didn't have time to read all the descriptions.

As I understand the tapped horn, there is a chamber around the back of the cone, and that chamber is connected via ports to the waveguide, in order to extend LF response. So the version in the figure is not a tapped horn, but a regular unity. No?

Sheldon
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Old 21st June 2010, 04:57 PM   #16
soho54 is offline soho54  United States
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Sheldon,

Fig.7 would be a 2way Synergy horn like say the SM-60M. A 3way like the SM-60F, would add a set of woofers with the enclosure interior tapped into the waveguide.

They are a step above the Unity design. There are a few small design parameter changes, and additions compared to the original patent. The end result is an emphasis on phase coherency in the Synergy horns.
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Old 21st June 2010, 11:15 PM   #17
JLH is offline JLH  United States
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There is no “Tapped Horn” per se in those new Synergy horns. In figure 7 the highs come from the compression driver and the mids come from the cone of the coax. The extra woofers tap into the horn just like all the other Synergy horns and are bass reflex loaded back into the horn.

The term tapped horn is used loosely in the fact that a Unity/Synergy horn is a form of tapped horn because it taps into the side of the horn and not at the throat. I believe nothing was made into something and got carried away.
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Old 4th September 2010, 04:49 AM   #18
Ibex is offline Ibex  Austria
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Cheers!
Just found something that could be of interest for you, a type of tapped horn combined with an unity, maybe you have already seen, take a look:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Unfortunately I have no more information about these designs, but probably someone of you could tell us more about those great builds?!
Would be interesting to know what drivers have been used to run these unity/tapped horn!?
gzg
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Old 4th September 2010, 06:48 AM   #19
jeno is offline jeno  Norway
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These are not builds. Just images made by a guy with a computer.
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Old 4th September 2010, 10:55 AM   #20
Ibex is offline Ibex  Austria
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What a pitty that these are just rendering creatures!
At the AVS forum there's a bit more info on it:
Unity/Synergy'ish DIY AkAbak Scripts - AVS Forum
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