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Multi-Way Conventional loudspeakers with crossovers

Suitable midrange cone, for bandpass mid in Unity horn.
Suitable midrange cone, for bandpass mid in Unity horn.
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Old 28th November 2013, 09:45 PM   #1411
chrapladm is offline chrapladm  Australia
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Sorry to hear also. I will have to wait 3 more weeks to get my M10's. Then about late January I should be able to get my CD's. So watching and learning from others gets me by.

So maybe both our projects will be done about the same time.
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Old 29th November 2013, 11:32 AM   #1412
JLH is offline JLH  United States
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Quote:
Originally Posted by nc535 View Post
That is very disappointing to those of us standing on or looking over your shoulders. Funny though that PE doesn't show it as out of stock; usually they do.
Yeah, I think they are trying to play the Just-In-Time inventory game with B&C. Although, I've always referred to this as the Just-Too-Late inventory game.
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Old 29th November 2013, 06:55 PM   #1413
JLH is offline JLH  United States
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Since my project is stuck on hold I just wanted to drop this script here for you guys to look at. I feel pretty good about it. This will be a 3-way paraline Synergy when I'm done. I have not added the woofers to the script yet. Just have the compression driver and mid with crossovers figured out. I've got plenty of time to figure out which woofers and their crossover.


System 'Paraline_Synergy'
Def_Driver 'CompDriver' | B&C DE120 compression driver
Sd=10.178cm2
Bl=8.2Tm
Cms=3.45E-05m/N
Rms=0.18Ns/m
Fs=1900Hz
Le=0.14mH
Re=7.5ohm
ExpoLe=0.618

Def_Driver 'MidDriver' |Eminence Alpha-6CBMRA 6" mid
Sd=126.7cm2
Bl=7.86Tm
Cms=1.97E-05m/N
Rms=3.29Ns/m
fs=406.98Hz
Le=0.38mH
Re=5.26ohm
ExpoLe=0.618


Def_Const | Unit is cm
{

FcPortMid_Len=0.2e-2; | Mid Enrty Port length
FcPortMid_dD=0.88705e-2; | Mid Entry Port diameter

Rg=0.50; |Amplifier output impedance (ohms)

R1Comp = 39; |compression driver Crossover R1 Resistor (Ohms)
R2Comp = 15; |compression driver Crossover R2 Resistor (Ohms)
R3Comp = 12; |compression driver Crossover R3 Resistor (Ohms)
C1Comp = 8.2e-6; |compression driver Crossover C1 capacitor (Farads)
C2Comp = 27e-6; |compression driver Crossover C2 capacitor (Farads)
C3Comp = 1.0e-6; |compression driver Crossover C3 capacitor (Farads)
L1Comp = 0.68e-3; |compression driver Crossover L1 inductor (Henries)
L2Comp = 0.068e-3; |compression driver Crossover L2 inductor (Henries)

R1Mid = 2.7; |Mid Crossover R1 Resistor (Ohms)
R2Mid = 25; |Mid Crossover R2 Resistor (Ohms)
C1Mid = 27e-6; |Mid Crossover C1 capacitor (Farads)
L1Mid = 1.2e-3; |Mid Crossover L1 inductor (Henries)


S1 = 1.1975e-4; |WG1 throat area & Comp phase plug (sq cm)
S2 = 5.1006e-4; |WG2 mouth area & horn segment 2 throat area & compression driver exit (sq cm)
S3 = 12.3e-4; |WG3 mouth area & horn segment 3 throat area & Mid tap point (sq cm)
S4 = 46.62e-4; |WG4 mouth area & horn segment 4 throat area (sq cm)
S5 = 1881e-4; |WG5 mouth area & horn segment 5 throat area (sq cm)


L12 = 3.9e-2; |WG1 axial length(cm)
L23 = 2.4e-2; |WG2 axial length(cm)
L34 = 9.3e-2; |WG3 axial length(cm)
L45 = 42e-2; |WG4 axial length(cm)


VrcComp = 0.08e-3; |compression driver Rear chamber volume (litres)
LrcComp = 0.84e-2; |compression driver Rear chamber average length (cm)
VtcComp = 0.75e-6; |compression driver Throat chamber volume (cc)
AtcComp = 15.520e-4; |compression driver Throat chamber cross-sectional area (sq cm)

ArcComp = VrcComp / LrcComp; |Conversions for CompDriver
LtcComp = VtcComp / AtcComp;
Sd=126.7E-02;

}
Duct 'CompRearChamber' Node=30=31
SD={ArcComp} Len={LrcComp} Visc=0
Driver 'D1' Def='CompDriver' Node=0=13=31=32
Duct 'CompFrontChamber' Node=32=140
SD={AtcComp} Len={LtcComp} Visc=0

Radiator 'Diaphragm1' Node=100 SD={Sd} Label=1
Driver 'D2' Def='MidDriver' Node=42=0=100=120
Enclosure 'E1' Node=120=130 Vb=116.87cm3 Lb=3.5cm |Mid front chamber volume
Duct 'DuMid_BP1' Node=130=160 dD={FcPortMid_dD} Len={FcPortMid_Len}
Duct 'DuMid_BP2' Node=130=160 dD={FcPortMid_dD} Len={FcPortMid_Len}
Duct 'DuMid_BP3' Node=130=160 dD={FcPortMid_dD} Len={FcPortMid_Len}
Duct 'DuMid_BP4' Node=130=160 dD={FcPortMid_dD} Len={FcPortMid_Len}
Duct 'DuMid_BP5' Node=130=160 dD={FcPortMid_dD} Len={FcPortMid_Len}
Duct 'DuMid_BP6' Node=130=160 dD={FcPortMid_dD} Len={FcPortMid_Len}
Duct 'DuMid_BP7' Node=130=160 dD={FcPortMid_dD} Len={FcPortMid_Len}
Duct 'DuMid_BP8' Node=130=160 dD={FcPortMid_dD} Len={FcPortMid_Len}
Duct 'DuMid_BP9' Node=130=160 dD={FcPortMid_dD} Len={FcPortMid_Len}
Duct 'DuMid_BP10' Node=130=160 dD={FcPortMid_dD} Len={FcPortMid_Len}
Duct 'DuMid_BP11' Node=130=160 dD={FcPortMid_dD} Len={FcPortMid_Len}
Duct 'DuMid_BP12' Node=130=160 dD={FcPortMid_dD} Len={FcPortMid_Len}

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

Resistor 'R1Comp'
Node=2=10
R={R1Comp}

Resistor 'R2Comp'
Node=12=13
R={R2Comp}

Resistor 'R3Comp'
Node=13=0
R={R3Comp}

Capacitor 'C1Comp'
Node=2=10
C={C1Comp}

Capacitor 'C2Comp'
Node=10=11
C={C2Comp}

Capacitor 'C3Comp'
Node=12=0
C={C3Comp}

Coil 'L1Comp'
Node=10=0
L={L1Comp}
Rs=0.4ohm

Coil 'L2Comp'
Node=11=12
L={L2Comp}
Rs=0.15ohm


Resistor 'R1Mid'
Node=41=42
R={R1Mid}

Capacitor 'C1Mid'
Node=2=40
C={C1Mid}

Coil 'L1Mid'
Node=40=41
L={L1Mid}
Rs=0.6ohm


Waveguide 'WG1'
Node=140=150
STh={S1}
SMo={S2}
Len={L12}
Conical

Waveguide 'WG2'
Node=150=160
STh={S2}
SMo={S3}
Len={L23}
T=1

Waveguide 'WG3'
Node=160=170
STh={S3}
SMo={S4}
Len={L34}
Conical

Waveguide 'WG4'
Node=170=180
STh={S4}
SMo={S5}
Len={L45}
Conical

Radiator 'Horn mouth'
Node=180
SD={S5}
x=0
y=0
z=0
HAngle=0
VAngle=0
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Ah, how beautifully the orchestra sounds before a rain! In a dry sunny day there is no way for the instruments to sound this way!

Last edited by JLH; 29th November 2013 at 06:57 PM.
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Old 29th November 2013, 10:42 PM   #1414
nc535 is offline nc535
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Default basic questions about akabak

Thanks, JHL. I'm looking at your script while I'm learning Akabak so I have a couple of basic questions.

Exporting a script from a HornResp. I was surprised to see that the HornResp SPL matched the Akabak acoustic power graph. Researching HornResp help, I found that HornResp assumes constant directivity and "the constant directivity SPL respsonse is the acoustic power response". I suppose I should have known that. I see then why one needs to move from HornResp to Akabak. (is the following correct?) HR gives you the general shape of the response and puts the peaks and nulls in the right places but its exported SPL shouldn't be used to develop a crossover (which I had just done)

You've explained in other posts that the rising response seen in the SPL simulation is compensated by the falling response of the CD horns being simulated but not why the simulations don't take that into account. Can you explain why the simulations don't or can't take that into account so that the target SPL would be flat?.

Thanks.
Jack
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Old 29th November 2013, 11:31 PM   #1415
tinitus is offline tinitus  Europe
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Suitable midrange cone, for bandpass mid in Unity horn.
just want to tell there is a new 6" Celestion, TF0615

I don't know, but it's cheap
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Old 30th November 2013, 12:38 AM   #1416
JLH is offline JLH  United States
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In Akabak the acoustical pressure graph shows you the rising response in the model. The Acoustical power graph shows the response with the horn's CD taken in consideration.
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Old 30th November 2013, 04:09 AM   #1417
nc535 is offline nc535
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so I had it backwards, the HornResp output is fine so long as I'm modeling a CD horn. I just can't get as detailed in HR.

I see the Paraline in your script. S2- S4 expand slowly. That must be it. S4-S5 looks like a conventional conical segment. You appear to be doing the mount the mid over the CD trick with all those ducts from the mids front chamber down into the WG at the tap point. Now we know why you wanted such a small CD...
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Old 30th November 2013, 08:44 AM   #1418
tinitus is offline tinitus  Europe
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Suitable midrange cone, for bandpass mid in Unity horn.
btw
regarding one pair of bigger mids, sidemounted

it seems to me like they are easy to get very closer to the throat than multiple smaller drivers
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Old 30th November 2013, 12:23 PM   #1419
chrapladm is offline chrapladm  Australia
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I thought the problem with using large mids was trying to keep velocity in check. Smaller mids is easier. But I could be wrong.
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Old 30th November 2013, 02:28 PM   #1420
tinitus is offline tinitus  Europe
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Suitable midrange cone, for bandpass mid in Unity horn.
yeah, you are probably right about that
needs bigger ports (lower xo point)
bigger tweeter that can be crossed lowish
(thinking about trying the low compression BMS4555)

and, there might be a serious problem having bigger port holes very close to tweeter throat

it's always like a can of worms
I'm not interested because I think it makes sense
just curious to hear how it works, and it might be fun
and ... I only need to build one, for my bass guitar
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