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LIVE SOUND Specific  Tapped Horn thread...
LIVE SOUND Specific  Tapped Horn thread...
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Old 21st January 2016, 04:03 PM   #761
carneoleon is offline carneoleon  Netherlands
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Would you have space for 400-450L external each?

Something like 50cm * 100cm * 90cm (20" * 39" * 35")

I'm thinking horn!!

BTW, I have listened to some music from a "dance hall reggae music" playlist on spotify while watching the spectrum.
There is quite a lot of content between 40-70hz as well.

Last edited by carneoleon; 21st January 2016 at 04:23 PM.
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Old 21st January 2016, 05:27 PM   #762
GM is offline GM  United States
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OK, good to know, but at what SPL referenced to the 80 -160 Hz range?

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Old 21st January 2016, 05:51 PM   #763
carneoleon is offline carneoleon  Netherlands
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On average, I would say about the same level. I haven't seen peaks higher than 6dB in the songs I listened.
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Old 21st January 2016, 06:21 PM   #764
GM is offline GM  United States
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OK, thanks! 'Sounds' like he needs a serious bass system ~ flat down to 40 Hz/2pi then.

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Old 21st January 2016, 07:47 PM   #765
Brian Steele is offline Brian Steele  Grenada
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Quote:
Originally Posted by weltersys View Post
Eight years ago yesterday designed a dual 15" tapped horn sub for Peavey Low riders for a friend, named it the "B-Low Rider", as it can do the low B on a 5 string bass justice.
For chuckles I tried to map your design into my THAM (LOL) spreadsheet and came up with the following (see image). The spreadsheet has a computational error in it because I assumed that Panel I would always overlap Panel H, which doesn't happen in your layout. As a result the path length predicted by the current version of the spreadsheet (as well as L34) will be a bit too long. I might update the spreadsheet to correct that later when I get the time.

Otherwise it looks pretty decent, with a smooth expansion (forget about between H and I - see note about the computation error above). Mouth looks slightly small by about 213 cm^2, but maybe I got one or more of the dimensions slightly wrong.
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File Type: png 2016-01-21 (1).png (226.9 KB, 307 views)
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Old 22nd January 2016, 02:44 AM   #766
Brian Steele is offline Brian Steele  Grenada
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...and here is the correct version. The path length is now being correctly calculated. And while adjusting the spreadsheet, I found another minor bug in how it was calculating S4, which is now fixed. Looks like a pretty close to optimal fold, if the calculations in my spreadsheet are correct.
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File Type: png 2016-01-21 (4).png (123.5 KB, 283 views)
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Old 22nd January 2016, 02:45 PM   #767
weltersys is offline weltersys  United States
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Originally Posted by Brian Steele View Post
...and here is the correct version. The path length is now being correctly calculated. And while adjusting the spreadsheet, I found another minor bug in how it was calculating S4, which is now fixed. Looks like a pretty close to optimal fold, if the calculations in my spreadsheet are correct.
Well, a pair of the 2x15" B-Low Riders kept up well with four 2x15" +2" cabinets for the outdoor snowboard crowd of 1200 or so on their first gig.
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Old 22nd January 2016, 07:04 PM   #768
Brian Steele is offline Brian Steele  Grenada
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Originally Posted by weltersys View Post
Well, a pair of the 2x15" B-Low Riders kept up well with four 2x15" +2" cabinets for the outdoor snowboard crowd of 1200 or so on their first gig.
Hah, at 50 cu.ft. in total it better keep up .

Anyway, just out of curiousity's sake, I tweaked the internal panels a bit and ended up with a slightly longer path length but also a larger mouth, so the change in FR turned out to be negligible...
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File Type: png 2016-01-22 (1).png (28.5 KB, 99 views)
File Type: png 2016-01-22 (2).png (137.2 KB, 91 views)
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Old 2nd February 2016, 04:32 PM   #769
DJFROSS345 is offline DJFROSS345  Cayman Islands
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hi guys,

got kind of discouraged after last post

please take your time with me guys

what do you think about the low max driver for peavey

18 inch
Revc (ohms) 6.10
Sd (Square Meters) 0.1237
BL (T/M) 25.51
Znom (ohms) 8
Vas (liters) 294.7
Cms (uM/N) 135.6
Mms (gm) 167.9
QMS 8.741
Qes 0.330
Net weight lb. / kg: 33.5 lbs. / 15.2 kg
Qts 0.318
Voice coil material: Polyimide coated copper ribbon wire Polyimide-impregnated fiberglass former Nomex® stiffener Solderless diffusion welded OFHC copper leads
Xmax (mm) 8.25
Voice coil diameter: 4.0" / 100 mm
Le (mH) 0.751
Cone: Kevlar® impregnated cellulose
SPL (1W 1m) 97.1
Usable freq. range: 30 Hz ~ 500 Hz
No (%) 3.21%
Sensitivity: 97.1 db
Vd (cu. in. / ml) 128.7 / 2110
Power capacity: 4800 W Peak, 2400 W Program, 1200 W Continuous
Pmax (Watts pgm.) 2400
Impedance 8 ohm
Disp (cu. in. / ml) 284 / 4655
Fo (Hz) 33.5
Weight Unpacked: 21.94 lb(9.95 kg)
Weight Packed: 24.14 lb(10.95 kg)
Width Packed: 20.079"(51.00066 cm)
Height Packed: 20.866"(52.99964 cm)
Depth Packed: 8.268"(21.00072 cm)
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