Tapped Horn TH-121 build

[ZivkoF]

Now days as there is more and more 21-inch drivers on the market would be nice to have some Tapper Horn build with it. I have one RCF LF21N451 driver and looking for Tapped Horn build with this driver in the box W 24-inch x H 60-inch x D 30-inch which is 1/2 size of DSL TH-221, horn path should be 18 foot long any suggestions how the inside of the box should look like and if you help me with Hornresp simulation. Thanks!

 

[ZivkoF]

Wood will be 18mm BB

RCF - LF21N451

 

[epa]

thats a +700 ltr cab.
hornpath 5.4 mtrs sugesting a flat to 16 hz horn?
what are you looking for ,in terms of output ,f3?

 

[epa]

 

[olsound]

Eric
Design a tapped horn with this driver for me but to exxpensive to buy and shipped.
[URL="http://www.diyaudio.com/forums/subwoofers/189551-r-evenge-c-omes-f-orce.html

 

[ZivkoF]

Thanks epa for your help . I will try to sketch three folds in the TH today as far I have now datas for S1 (364,24 cm2), S2 (476,09 cm2), S3 (1790,78 cm2) and S4 (3556,32 cm2)..

 

[epa]

1 a compresion ratio 3.5 to 1 ,is to much,especialy for a 21 driver.
2 the areas you sugested give an odd fr responce.
if you tell us what freq range you are looking for,we can be of better asistence.

 

[ZivkoF]

Hi epa, just instaled new Hornresp Version 29.00 my old didnt worked good. I need TH from some 18 Hz - 60 Hz ! I have 2 FLHs from 35 Hz - 140 Hz. Some new datas: S1=364,24; S2=476,09; S3=1032,48; S4=1493,37; S5=3556,32; and L12 Con=34,00; L23 Exp=200,00; L34 Con=190,00; L45 Con=120 which means Horn lenght is 544,00 cm.

 

[epa]

remeber the system volume,you have to add 25 to 35% extra volume for pannels and corner losses.
ie if the sym says 400 ltr the box wil be close to 600 ltrs in real live.
if you have a sim i can (try)convert it to a model.

 

[m R g S r]

Josh Ricci has a horn designed around the B&C 21" monster, and I mentioned the RCF you have listed, and he said it didn't sim nicely in his horn...

With that much surface area from the 21" driver, are you sure a Bass reflex tuned to 15hz or so wouldn't be enough?

 

[ZivkoF]

Some Freq. and SPL(dB) informations at input 2,83V for TH-121

Freq SPL (dB)
10.00 66.56
10.14 67.05
10.29 67.55
10.44 68.04
10.59 68.54
10.74 69.03
10.90 69.53
11.05 70.02
11.21 70.52
11.37 71.02
11.54 71.51
11.70 72.00
11.87 72.50
12.04 72.99
12.22 73.49
12.39 73.98
12.57 74.48
12.75 74.98
12.94 75.47
13.12 75.97
13.31 76.47
13.50 76.96
13.70 77.46
13.89 77.96
14.10 78.46
14.30 78.96
14.50 79.46
14.71 79.96
14.92 80.47
15.14 80.97
15.36 81.48
15.58 81.98
15.80 82.49
16.03 83.00
16.26 83.52
16.50 84.03
16.73 84.54
16.98 85.06
17.22 85.58
17.47 86.11
17.72 86.63
17.97 87.15
18.23 87.68
18.50 88.21
18.76 88.74
19.03 89.27
19.31 89.80
19.59 90.33
19.87 90.86
20.15 91.38
20.44 91.90
20.74 92.42
21.04 92.92
21.34 93.42
21.65 93.90
21.96 94.36
22.28 94.81
22.60 95.23
22.92 95.62
23.25 95.98
23.59 96.30
23.93 96.59
24.27 96.83
24.62 97.03
24.98 97.19
25.34 97.31
25.70 97.40
26.07 97.44
26.45 97.45
26.83 97.44
27.21 97.40
27.61 97.34
28.00 97.26
28.41 97.17
28.82 97.07
29.23 96.96
29.65 96.85
30.08 96.73
30.51 96.62
30.95 96.50
31.40 96.38
31.85 96.27
32.31 96.16
32.77 96.05
33.25 95.95
33.72 95.85
34.21 95.75
34.70 95.66
35.20 95.58
35.71 95.49
36.22 95.42
36.75 95.35
37.28 95.28
37.81 95.22
38.36 95.17
38.91 95.12
39.47 95.07
40.04 95.03
40.62 94.99
41.20 94.96
41.79 94.94
42.40 94.92
43.01 94.91
43.63 94.90
44.26 94.89
44.89 94.89
45.54 94.90
46.20 94.91
46.86 94.93
47.54 94.95
48.22 94.98
48.91 95.02
49.62 95.06
50.33 95.11
51.06 95.16
51.79 95.22
52.54 95.29
53.30 95.37
54.07 95.45
54.84 95.55
55.63 95.65
56.44 95.77
57.25 95.90
58.07 96.04
58.91 96.19
59.76 96.36
60.62 96.55
61.49 96.76
62.38 97.00
63.28 97.25
64.19 97.55
65.11 97.87
66.05 98.25
67.00 98.67
67.97 99.16
68.95 99.73
69.94 100.39
70.95 101.17
71.97 102.09
73.01 103.17
74.06 104.42
75.12 105.78
76.21 106.99
77.30 107.48
78.42 106.82
79.55 105.34
80.69 103.67
81.85 102.15
83.03 100.89
84.23 99.93
85.44 99.23
86.67 98.77
87.92 98.54
89.19 98.48
90.47 98.57
91.78 98.79
93.10 99.11
94.44 99.51
95.80 99.97
97.18 100.47
98.58 101.01
100.00 101.57
101.44 102.14
102.90 102.73
104.38 103.32
105.89 103.90
107.41 104.46
108.96 105.00
110.53 105.50
112.12 105.94
113.74 106.32
115.38 106.62
117.04 106.83
118.72 106.95
120.43 106.97

 

[ZivkoF]

Freq. & SPL(dB) chart is in 2,0 x Pi space.

 

[epa]

huge cab zivkof !
top is yours
bottem red sugestion vs yours.

edit/ added 1 more simpler

 

[ZivkoF]

Thanks epa for sugestion, it is OK and I might use it, I will see how complex the build will be, yes it is not small but it is more in the height H where I have more place as W or D. I have full horn system from 2-way Hi/Mid speakers with sensitivity 110 dB @1w/1m to low FLHs with sensitivity 108 dB @ 1w/1m and TH-121 willl be for sub low frequency!

 

[epa]

i would suggest xco1's or jbell ss15 fold,you can easely extend vertical to get the lengt desired.
if you need any help modeling something ,let me know.

 

[ZivkoF]

i would suggest xco1's or jbell ss15 fold,you can easely extend vertical to get the lengt desired.
if you need any help modeling something ,let me know.

Yes would need some help. How you model L12 (0,01) in the last Schematic Diagrame Volume of 702.009 Litres, where to face the front of the driver. I am thinking for smaller foot print 24-inch x 24-inch x 60-inch high or 71-inch high.

 

[epa]

Yes would need some help. How you model L12 (0,01) in the last Schematic Diagrame Volume of 702.009 Litres, where to face the front of the driver. I am thinking for smaller foot print 24-inch x 24-inch x 60-inch high or 71-inch high.

that one uses a chamber.
in case of a chamber or ported entrance of the horn system ,s1=s2.

your 70"version is 670 ltr!
as i explaned a couple of posts back ,if the hr sim is 700 ltr(system volume)
the real volume would become closer to 900 ltrs.!!
if you sym for 670 ltr cab(70" version) the sym must end up something like ~500 ltrs.>you end up with 93 db @2.83 v from 20 to 60 flat

 

[ZivkoF]

that one uses a chamber.
in case of a chamber or ported entrance of the horn system ,s1=s2.

your 70"version is 670 ltr!
as i explaned a couple of posts back ,if the hr sim is 700 ltr(system volume)
the real volume would become closer to 900 ltrs.!!
if you sym for 670 ltr cab(70" version) the sym must end up something like ~500 ltrs.>you end up with 93 db @2.83 v from 20 to 60 flat

Thanks epa, it will be 61cm x 61cm x 180cm sym for 670 ltr with real some 540 ltr. It will look like the below picture, is S1, S2, S3, S4 and L12, L23, L34 right?

 

[epa]

Thanks epa, it will be 61cm x 61cm x 180cm sym for 670 ltr with real some 540 ltr. It will look like the below picture, is S1, S2, S3, S4 and L12, L23, L34 right?

pretty much.
you should take the center of the hornpath for the l value's

 

[ZivkoF]

pretty much.
you should take the center of the hornpath for the l value's

Hi epa,


just change my plan I am making now Tapped Horn with 18-inch driver, 21-inch was to big. TH will be W 22.83 x H 49.21 x D 30.00 and the horn path will be some 15.47 feel long and for wood will use Marine plywood which is lighter weight than BB and it is first class wood any experience with Marine plywood.