Suitable midrange cone, for bandpass mid in Unity horn. - Page 142 - diyAudio
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Old 19th November 2013, 10:26 AM   #1411
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Location: Mumbai
Quote:
So the patented shape of the BMS - a ring - is a clever way of having your cake and eating it too. It has the same voice coil diameter as a dome, but the size of the radiator is reduced.
As i understand the Bms patent is for the phase plug and not the ring radiator diaphragm , though the patent paper goes to lengths describing the benefits of the ring radiator when used along with the - phase plug

Fane and many others have used ring radiators over a long period of time

Yes Bms is the first to use the surface area of the radiator + phase plugs earlier designs used just a radial part , fixed with a phasing / wave guide arrangement comoonly refered to as bullet tweeter

Now Faital Pro , Jbl D2 are some of the drivers with Non fancy material diaphragms using the ring radiator in a similar fashion with good success .

The BMS drivers success is in its motor design , the magnet is neo but not N grade as mostly used , when matched to the steel alloy developed and used in their motor structure optimised over the other properties that define a magnet mkakes it a much superior driver / than designed by the fea tools we are using . (BMS refers to this as superior grade Neo Magnets for light weight etc,)

Suranjan
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Old 27th November 2013, 09:46 PM   #1412
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JLH did you ever build a horn and use your Visaton M10's?

I keep hearing bad and good things about them. Makes me nervous as to what I am buying is all. Also curious to see what you came up with.
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Old 28th November 2013, 11:11 AM   #1413
JLH is offline JLH  United States
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Quote:
Originally Posted by chrapladm View Post
JLH did you ever build a horn and use your Visaton M10's?

I keep hearing bad and good things about them. Makes me nervous as to what I am buying is all. Also curious to see what you came up with.
One of the B&C Speakers DE120 drivers I ordered was defective (open voice coil). Parts Express covered it no questions asked, but B&C is telling them no stock until April 2014. Everything is delayed until then.
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Old 28th November 2013, 03:29 PM   #1414
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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.
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Old 28th November 2013, 08:45 PM   #1415
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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, 10:32 AM   #1416
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, 05:55 PM   #1417
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 05:57 PM.
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Old 29th November 2013, 09:42 PM   #1418
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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, 10:31 PM   #1419
tinitus is offline tinitus  Europe
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just want to tell there is a new 6" Celestion, TF0615

I don't know, but it's cheap
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Old 29th November 2013, 11:38 PM   #1420
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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