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That would be awesome. I guess I could make that request. I have already generated some cosine-gated CEA test tones with GoldWave using the instructions from Linkwitz's site.


Working on tabulating the thresholds. I think I can actually do this with Excel and the SPL measurement tools I have already if I can get a FRD-style text dump of a spectrum measurement.


Edit - and--- it looks like I can from REW.


Will post results as soon as I get this sorted.
 

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Discussion Starter #443
Good luck Mike but I am not sure how close the results would be. There has been significant differences shown between even the "official" setup used by different parties. I tried to use ARTA and a peak hold setup to capture something similar previously and that was just not the same. Some of the results were quite close and others were way off between the 2 different ways. If you want to try I would suggest getting the signal correct first. Good luck!
 

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Ricci what kind of Hpas would be needed for this sub if used in a home with a Pi18?


I doubt anyone would ever need a Hpas in a home environment but I wanted to ask. I have been looking at maybe getting a pair of the Pi18's and building a monster like this would be a good way for me to finally be able to hear which I would like to have. (Pi18 sealed or TH)


And should I send you a PM for the plans when closer to a build?


Thanks
 

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Quote:
Originally Posted by lilmike /forum/post/0


Done.


We'll see if this goes anywhere.

How will you track tonebursts with the spectrum function? Is there a peak hold that can be used as the tonebursts play?


For steadystate tones, this ROCKS.


All we need now is to be able to track distortion components in REW like HolmImpulse can....


JSS
 

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Discussion Starter #447

Quote:
Originally Posted by maxmercy /forum/post/21341206


For steadystate tones, this ROCKS.


All we need now is to be able to track distortion components in REW like HolmImpulse can....


JSS

Agreed. I mentioned this to John long ago. If he can get harmonic distortion measurements during the sweeps implemented that would be huge for me. I use ARTA for that now. STEPS is great but way too brutal for high power. The other thing that I asked him about was beefing the generator up even further and allowing multiple sine wave output. Similar to NCH tone generator. Also the ability to do ascending or descending sweeps for measurements would be cool. REW has come a long, long way already.
 

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Discussion Starter #448

Quote:
Originally Posted by chrapladm /forum/post/21340709


Ricci what kind of Hpas would be needed for this sub if used in a home with a Pi18?


I doubt anyone would ever need a Hpas in a home environment but I wanted to ask. I have been looking at maybe getting a pair of the Pi18's and building a monster like this would be a good way for me to finally be able to hear which I would like to have. (Pi18 sealed or TH)


And should I send you a PM for the plans when closer to a build?


Thanks

Something near 14Hz and 18 or 24dB octave roll off would be recommended.


Sure.
 

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Here is the Akabak script...The max input on this thing should be about 130V short term without clanking the cone into the spider landing. I will be putting a steep 14 to 15hz hpf on it. Cone excursion hits clankity levels with 130v in at about 14.5hz and is close at the excursion maxima above the corner.








I actually ran out of sections on this.


|COMMENT:LMS5400 ULTRA 18hz 45x45x24 TH 020411 FINAL, no dead space, straight throat, with constriction, big mouth(LMS obstructs roughly 613cm2)

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

|REQUIRED AKABAK SETTINGS:

|File > Preferences > Physical system constants:

|Sound velocity c = 344m/s
|Medium density rho = 1.205kg/m3

|Sum > Acoustic power:

|Frequency range = 10Hz to 20kHz
|Points = 533
|Input voltage = 1.97V rms
|Integration = 2Pi-sr
|Integration steps = 1 degree ... 1 degree
|Integration method = Cross

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

Def_Const |Input Parameter Values
{
|Length, area and volume values converted to metres, square metres and cubic metres:

S1 = 82.90855e-4; |Horn segment 1 throat area (sq cm)
S2 = 308.14365e-4; |Horn segment 1 mouth area and horn segment 2 throat area (sq cm)
S3 = 453.98375e-4; |Horn segment 2 mouth area and horn segment 3 throat area (sq cm)
S4 = 226.85056e-4; |Horn segment 3 mouth area and horn segment 4 throat area (sq cm)/ brace area
S5 = 249.88796e-4; |Horn segment 4 mouth area and horn segment 5 throat area (sq cm)/ brace area
S6 = 513.6456e-4; |Horn segment 5 mouth area and horn segment 6 throat area (sq cm)
S7 = 729.21504e-4; |Horn segment 6 mouth area and horn segment 7 throat area (sq cm)
S8 = 517.6522e-4; |Horn segment 7 mouth area and horn segment 8 throat area (sq cm)
S9 = 254.60955e-4; |Horn segment 8 mouth area and horn segment 9 throat area (sq cm)/ brace area
S10 = 278.2318e-4; |Horn segment 9 mouth area and horn segment 10 throat area (sq cm)/ brace area
S11 = 570.7141e-4; |Horn segment 10 mouth area and horn segment 11 throat area (sq cm)
S12 = 846.68843e-4; |Horn segment 11 mouth area and horn segment 12 throat area (sq cm)
S13 = 579.57232e-4; |Horn segment 12 mouth area and horn segment 13 throat area (sq cm)
S14 = 795.34572e-4; |Horn segment 13 mouth area and horn segment 14 throat area (sq cm)
S15 = 587.76034e-4; |Horn segment 14 mouth area and horn segment 15 throat area (sq cm)
S16 = 628.4965e-4; |Horn segment 15 mouth area and horn segment 16 throat area (sq cm)
S17 = 894.92785e-4; |Horn segment 16 mouth area and horn segment 17 throat area (sq cm)
S18 = 637.70438e-4; |Horn segment 17 mouth area and horn segment 18 throat area (sq cm)
S19 = 908.89994e-4; |Horn segment 18 mouth area and horn segment 19 throat area (sq cm)
S20 = 647.05796e-4; |Horn segment 19 mouth area and horn segment 20 throat area (sq cm)
S21 = 684.16633e-4; |Horn segment 20 mouth area and horn segment 21 throat area (sq cm)
S22 = 1014.9946e-4; |Horn segment 21 mouth area and horn segment 22 throat area (sq cm)
S23 = 694.67089e-4; |Horn segment 22 mouth area and horn segment 23 throat area (sq cm)
S24 = 955.76983e-4; |Horn segment 23 mouth area and horn segment 24 throat area (sq cm)
S25 = 704.47613e-4; |Horn segment 24 mouth area and horn segment 25 throat area (sq cm)
S26 = 728.39915e-4; |Horn segment 25 mouth area and horn segment 26 throat area (sq cm)
S27 = 1037.1547e-4; |Horn segment 26 mouth area and horn segment 27 throat area (sq cm)
S28 = 739.10769e-4; |Horn segment 27 mouth area and horn segment 28 throat area (sq cm)
S29 = 1019.4091e-4; |Horn segment 28 mouth area and horn segment 29 throat area (sq cm)
S30 = 749.69967e-4; |Horn segment 29 mouth area and horn segment 30 throat area (sq cm)
S31 = 964.5552e-4; |Horn segment 30 mouth area and horn segment 31 throat area (sq cm)
S32 = 1367.7644e-4; |Horn segment 31 mouth area and horn segment 32 throat area (sq cm)
S33 = 989.80404e-4; |Horn segment 32 mouth area and horn segment 33 throat area (sq cm)
S34 = 1038.2765e-4; |Horn segment 33 mouth area and horn segment 34 throat area (sq cm)
S35 = 1428.0236e-4; |Horn segment 34 mouth area and horn segment 35 throat area (sq cm)
S36 = 1058.7029e-4; |Horn segment 35 mouth area and horn segment 36 throat area (sq cm)
S37 = 1060.4949e-4; |Horn segment 36 mouth area and horn segment 37 throat area (sq cm)
S38 = 1509.5979e-4; |Horn segment 37 mouth area and horn segment 38 throat area (sq cm)
S39 = 1075.8948e-4; |Horn segment 38 mouth area and horn segment 39 throat area (sq cm)
S40 = 532.2565e-4; |Horn segment 39 mouth area and horn segment 40 throat area (sq cm)/ brace area
S41 = 682.62005e-4; |Horn segment 40 mouth area and horn segment 41 throat area (sq cm)/ brace area
S42 = 1413.3813e-4; |Horn segment 41 mouth area and horn segment 42 throat area (sq cm)
S43 = 2501.1503e-4; |Horn segment 42 mouth area and horn segment 43 throat area (sq cm)
S44 = 2065.1744e-4; |Horn segment 43 mouth area and horn segment 44 throat area (sq cm)
S45 = 2067.7094e-4; |Horn segment 44 mouth area and horn segment 45 throat area (sq cm)
S46 = 1505.2217e-4; |Horn segment 45 mouth area and horn segment 46 throat area (sq cm)/ (1505.2217 with driver restriction, 2118.2217 without)
S47 = 2167.5538e-4; |Horn segment 46 mouth area and horn segment 47 throat area (sq cm)
S48 = 2237.6765e-4; |Horn segment 47 mouth area and horn segment 48 throat area (sq cm)
S49 = 2611.6741e-4; |Horn segment 48 mouth area (sq cm)


L12 = 23.64486e-2; |Horn segment 1 axial length (cm)
L23 = 54.00802e-2; |Horn segment 2 axial length (cm)
L34 = 8.93572e-2; |Horn segment 3 axial length (cm)brace area
L45 = 47.001684e-2; |Horn segment 4 axial length (cm)
L56 = 3.214878e-2; |Horn segment 5 axial length (cm)
L67 = 3.504946e-2; |Horn segment 6 axial length (cm)
L78 = 3.563112e-2; |Horn segment 7 axial length (cm)
L89 = 2.418334e-2; |Horn segment 8 axial length (cm)brace area
L910 = 48.208438e-2; |Horn segment 9 axial length (cm)
L1011 = 2.373376e-2; |Horn segment 10 axial length (cm)
L1112 = 4.11353e-2; |Horn segment 11 axial length (cm)
L1213 = 4.7655988e-2; |Horn segment 12 axial length (cm)
L1314 = 4.3843448e-2; |Horn segment 13 axial length (cm)
L1415 = 3.827526e-2; |Horn segment 14 axial length (cm)
L1516 = 40.694864e-2; |Horn segment 15 axial length (cm)
L1617 = 4.298442e-2; |Horn segment 16 axial length (cm)
L1718 = 4.9505108e-2; |Horn segment 17 axial length (cm)
L1819 = 4.9652428e-2; |Horn segment 18 axial length (cm)
L1920 = 4.418838e-2; |Horn segment 19 axial length (cm)
L2021 = 37.065458e-2; |Horn segment 20 axial length (cm)
L2122 = 4.912106e-2; |Horn segment 21 axial length (cm)
L2223 = 5.5748428e-2; |Horn segment 22 axial length (cm)
L2324 = 5.1532028e-2; |Horn segment 23 axial length (cm)
L2425 = 4.58724e-2; |Horn segment 24 axial length (cm)
L2526 = 35.401758e-2; |Horn segment 25 axial length (cm)
L2627 = 4.999228e-2; |Horn segment 26 axial length (cm)
L2728 = 5.6479948e-2; |Horn segment 27 axial length (cm)
L2829 = 5.4557168e-2; |Horn segment 28 axial length (cm)
L2930 = 5.119624e-2; |Horn segment 29 axial length (cm)
L3031 = 47.806102e-2; |Horn segment 30 axial length (cm)
L3132 = 6.366002e-2; |Horn segment 31 axial length (cm)
L3233 = 6.6675e-2; |Horn segment 32 axial length (cm)
L3334 = 32.559498e-2; |Horn segment 33 axial length (cm)
L3435 = 6.745478e-2; |Horn segment 34 axial length (cm)
L3536 = 6.860286e-2; |Horn segment 35 axial length (cm)
L3637 = 1.203452e-2; |Horn segment 36 axial length (cm)
L3738 = 7.239254e-2; |Horn segment 37 axial length (cm)
L3839 = 7.780782e-2; |Horn segment 38 axial length (cm)
L3940 = 1.651254e-2; |Horn segment 39 axial length (cm)brace area
L4041 = 51.303936e-2; |Horn segment 40 axial length (cm)
L4142 = 3.48996e-2; |Horn segment 41 axial length (cm)
L4243 = 12.146026e-2; |Horn segment 42 axial length (cm)
L4344 = 10.563352e-2; |Horn segment 43 axial length (cm)
L4445 = 1.200658e-2; |Horn segment 44 axial length (cm)
L4546 = 23.711916e-2; |Horn segment 45 axial length (cm)
L4647 = 23.490936e-2; |Horn segment 46 axial length (cm)
L4748 = 33.151826e-2; |Horn segment 47 axial length (cm)
L4849 = 6.847332e-2; |Horn segment 47 axial length (cm)

Vtc = 3500.00e-6; |Throat chamber volume (cc)
Atc = 1465.00e-4; |Throat chamber cross-sectional area (sq cm)

|Parameter Conversions:

Sd = 1194.60e-4; |Diaphragm area (sq cm)

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

|Network node numbers for this tapped horn system:

| 0-Voltage-1
| |
| -Chamber-5-Driver---
| | |
|8-Segment-9-Segment-10-Segment-11-Segment-12-Segment-13-Segment-14-Segment-15-Segment-16-Segment-17-Segment-18-Segment-19-Segment-20-Segment-21-Segment-22-Segment-23-Segment-24-Segment-25-Segment-26-Segment-27-Segment-28-Segment-29-Segment-30-Segment-31-Segment-32-Segment-33-Segment-34-Segment-35-Segment-36-Segment-37-Segment-38-Segment-39-Segment-40-Segment-41-Segment-42-Segment-43-Segment-44-Segment-45-Segment-46-Segment-47-Segment-48-Segment-49-Segment-50-Segment-51-Segment-52-Segment-53-Segment-54-Segment-55-Segment-56-Radiator

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

Def_Driver 'Driver'

Sd=1194.60cm2
Bl=26.93Tm
Cms=1.19E-04m/N
Rms=8.58Ns/m
fs=20.5001Hz |Mmd = 482.71g not recognised by AkAbak, fs calculated and used instead
Le=2.80mH
Re=3.78ohm
ExpoLe=1

System 'System'

Driver Def='Driver''Driver'
Node=1=0=5=53

Duct 'Throat chamber'
Node=5=9
SD={Atc}
Len={Ltc}
Visc=0


Waveguide 'Horn segment 1'
Node=8=9
STh={S1}
SMo={S2}
Len={L12}


Waveguide 'Horn segment 2'
Node=9=10
STh={S2}
SMo={S3}
Len={L23}


Waveguide 'Horn segment 3'
Node=11=10
STh={S4}
SMo={S3}
Len={L34}

Waveguide 'Horn segment 4'
Node=11=12
STh={S4}
SMo={S5}
Len={L45}

Waveguide 'Horn segment 4B'
Node=11=12
STh={S4}
SMo={S5}
Len={L45}

Waveguide 'Horn segment 5'
Node=12=13
STh={S5}
SMo={S6}
Len={L56}

Waveguide 'Horn segment 6'
Node=13=14
STh={S6}
SMo={S7}
Len={L67}

Waveguide 'Horn segment 7'
Node=15=14
STh={S8}
SMo={S7}
Len={L78}

Waveguide 'Horn segment 8'
Node=16=15
STh={S9}
SMo={S8}
Len={L89}

Waveguide 'Horn segment 9'
Node=16=17
STh={S9}
SMo={S10}
Len={L910}

Waveguide 'Horn segment 9B'
Node=16=17
STh={S9}
SMo={S10}
Len={L910}

Waveguide 'Horn segment 10'
Node=17=18
STh={S10}
SMo={S11}
Len={L1011}

Waveguide 'Horn segment 11'
Node=18=19
STh={S11}
SMo={S12}
Len={L1112}

Waveguide 'Horn segment 12'
Node=20=19
STh={S13}
SMo={S12}
Len={L1213}


Waveguide 'Horn segment 13'
Node=20=21
STh={S13}
SMo={S14}
Len={L1314}


Waveguide 'Horn segment 14'
Node=22=21
STh={S15}
SMo={S14}
Len={L1415}


Waveguide 'Horn segment 15'
Node=22=23
STh={S15}
SMo={S16}
Len={L1516}

Waveguide 'Horn segment 16'
Node=23=24
STh={S16}
SMo={S17}
Len={L1617}

Waveguide 'Horn segment 17'
Node=25=24
STh={S18}
SMo={S17}
Len={L1718}

Waveguide 'Horn segment 18'
Node=25=26
STh={S18}
SMo={S19}
Len={L1819}

Waveguide 'Horn segment 19'
Node=27=26
STh={S20}
SMo={S19}
Len={L1920}

Waveguide 'Horn segment 20'
Node=27=28
STh={S20}
SMo={S21}
Len={L2021}

Waveguide 'Horn segment 21'
Node=28=29
STh={S21}
SMo={S22}
Len={L2122}

Waveguide 'Horn segment 22'
Node=30=29
STh={S23}
SMo={S22}
Len={L2223}

Waveguide 'Horn segment 23'
Node=30=31
STh={S23}
SMo={S24}
Len={L2324}


Waveguide 'Horn segment 24'
Node=32=31
STh={S25}
SMo={S24}
Len={L2425}


Waveguide 'Horn segment 25'
Node=32=33
STh={S25}
SMo={S26}
Len={L2526}


Waveguide 'Horn segment 26'
Node=33=34
STh={S26}
SMo={S27}
Len={L2627}

Waveguide 'Horn segment 27'
Node=35=34
STh={S28}
SMo={S27}
Len={L2728}

Waveguide 'Horn segment 28'
Node=35=36
STh={S28}
SMo={S29}
Len={L2829}

Waveguide 'Horn segment 29'
Node=37=36
STh={S30}
SMo={S29}
Len={L2930}

Waveguide 'Horn segment 30'
Node=37=38
STh={S30}
SMo={S31}
Len={L3031}

Waveguide 'Horn segment 31'
Node=38=39
STh={S31}
SMo={S32}
Len={L3132}

Waveguide 'Horn segment 32'
Node=40=39
STh={S33}
SMo={S32}
Len={L3233}

Waveguide 'Horn segment 33'
Node=40=41
STh={S33}
SMo={S34}
Len={L3334}

Waveguide 'Horn segment 34'
Node=41=42
STh={S34}
SMo={S35}
Len={L3435}

Waveguide 'Horn segment 35'
Node=43=42
STh={S36}
SMo={S35}
Len={L3536}

Waveguide 'Horn segment 36'
Node=43=44
STh={S36}
SMo={S37}
Len={L3637}

Waveguide 'Horn segment 37'
Node=44=45
STh={S37}
SMo={S38}
Len={L3738}

Waveguide 'Horn segment 38'
Node=46=45
STh={S39}
SMo={S38}
Len={L3839}

Waveguide 'Horn segment 39'
Node=47=46
STh={S40}
SMo={S39}
Len={L3940}

Waveguide 'Horn segment 40'
Node=47=48
STh={S40}
SMo={S41}
Len={L4041}

Waveguide 'Horn segment 40B'
Node=47=48
STh={S40}
SMo={S41}
Len={L4041}

Waveguide 'Horn segment 41'
Node=48=49
STh={S41}
SMo={S42}
Len={L4142}

Waveguide 'Horn segment 42'
Node=49=50
STh={S42}
SMo={S43}
Len={L4243}

Waveguide 'Horn segment 43'
Node=51=50
STh={S44}
SMo={S43}
Len={L4344}

Waveguide 'Horn segment 44'
Node=51=52
STh={S44}
SMo={S45}
Len={L4445}

Waveguide 'Horn segment 45'
Node=53=52
STh={S46}
SMo={S45}
Len={L4546}

Waveguide 'Horn segment 46'
Node=53=54
STh={S46}
SMo={S47}
Len={L4647}

Waveguide 'Horn segment 47'
Node=54=55
STh={S47}
SMo={S48}
Len={L4748}

Waveguide 'Horn segment 48'
Node=55=56
STh={S48}
SMo={S49}
Len={L4849}

Radiator 'Horn mouth'
Node=56
SD={S49}
@Gorilla83,

Can you use this script in your CNC?
 

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@Archaea


you probably know, but the gjallarhorn has a constant width, so all the internal panels are whatever width the cab is less the two side panels.


ricci posted the plan.
all that needs to be calculated are the panel lengths depending on which panels you want to but up against which panel at the panel intersections, though somebody who has built one may have the panel dimensions already on hand.





since it is a scale drawing, you could always 'front projector' it onto a piece of paper at 100% scale, trace it, and simply measure with an old fashioned yardstick. :)


there is also a gjallarhorn v2 if you like a center located horn exit.
 

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Discussion Starter #451 (Edited)
@Archaea, @Gorilla83

Here is the v2 template from the print. If either of you want I can just send you the print PDF or DXF if you want. If you can handle large assemblies or parts files there are all sorts of options there as well. I'd need you to pm me your email though. I have a couple of guys I need to send the plans to next time I get a chance anyway.

Also I just read back through this thread and there is some great discussion going on at the beginning. I've learned so much since then. Also realized that the Gjallarhorn version 1 is now 4 years old. Dang.
 

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Also I just read back through this thread and there is some great discussion going on at the beginning. I've learned so much since then. Also realized that the Gjallarhorn version 1 is now 4 years old. Dang.
My Gjallarhorns had their 1 year birthday a couple of months ago. I am amazed that more people haven't built them with all of the bassheads we have running around here on AVS. This has to be one of the best gifts to the DIY community - thanks again for sharing, Josh. I just bought a couple of UXL18 in case I need to build two more (probably will)
 

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My Gjallarhorns had their 1 year birthday a couple of months ago. I am amazed that more people haven't built them with all of the bassheads we have running around here on AVS. This has to be one of the best gifts to the DIY community - thanks again for sharing, Josh. I just bought a couple of UXL18 in case I need to build two more (probably will)
I believe that this is due to the difficulty & complexity of the build as compared to sealed & ported designs, I wish I have the skills to build two of each Ghorn & Othorn as well :(
 
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