Live sound specific Tapped Horn thread...

[carneoleon]

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.

 

[GM]

OK, good to know, but at what SPL referenced to the 80 -160 Hz range?

GM

 

[carneoleon]

On average, I would say about the same level. I haven't seen peaks higher than 6dB in the songs I listened.

 

[GM]

OK, thanks! 'Sounds' like he needs a serious bass system ~ flat down to 40 Hz/2pi then.

GM

 

[Brian Steele]

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.

 

[Brian Steele]

...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.

 

[weltersys]

...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.

 

[Brian Steele]

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...

 

[DJFROSS345]

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)

 

[geritass]

Dr.Fross,

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.
You could just make larger speaker cut outs and scale the height up to fit your 18" (30.5" dimensions go to 36.5" or 37") and be stomping.

Art

I wonder the external size about "B-Low Rider"
EXTERNAL SIZE IS 45" X 30" X __?
(Because in the plan says Top & Bottom 40"X30")
Thanks in advance Master!

 

[weltersys]

I wonder the external size about "B-Low Rider"
EXTERNAL SIZE IS 45" X 30" X __?

Geritass
Plans are in post #750, external size using 3/4" material is 45" wide x 30" deep 32" high.

Art

 

[geritass]

Weltersys,

Thanks a lot, Take care Master!

 

[Zwiller]

Art,
Have any HR info for that 2X15 B-low? Intrigued.

 

[weltersys]

Have any HR info for that 2X15 B-low?

Sam,

Brian Steele's Hornresp inputs in #751 should be close.
The "B-Low Rider" design was from 1/17/08, I first used Hornresp 2/15/11.
Unfortunately, my PC died about a year or so ago, haven't been on Hornresp since.

Art

 

[GM]

Hmm, you weren't kidding earlier about modding it just enough to fit the 18"; inputting a single BW18 into it as built yields an acoustically identical sim of your original dual 15".

GM

 

[weltersys]

GM,

Good to hear that the dual/single 18 version would work about the same- should have more output at 9.6mm excursion (Xmax).
Curious how my measurements compare to the simulation.
Could you post the input, output and excursion sims at Xmax?

Art

 

[GM]

Greets!

Hmm, apparently my LR 18 specs are either from an earlier version or somebody's measured specs with an 8.3 mm Xmax, so with the 9.6's specs from PE, it sims a bit under-damped due to higher Qt, but the as built cab will be a bit bigger to compensate, so hopefully still good enough.

GM

 

[weltersys]

GM,

Thanks!

The Low Rider 15" TS parameters from 2002 appear to be the same as the Parts Express 2011 spec sheet, but the 18" has changed quite a bit.

 

[maxolini]

Hey, so reading a lot of threads on TH, the general consensus is that adding those 45 degree angles do not help the response and rob volume to the box
check the pic below from

runrod1948​

who built a furybox but says that there was some discrepancies on the plans
anyway, what if you remove the pieces i circled in red.

https://www.diyaudio.com/community/threads/live-sound-specific-tapped-horn-thread.131852/page-36
post# 717

 

[Speedysteve7]

Hey, so reading a lot of threads on TH, the general consensus is that adding those 45 degree angles do not help the response and rob volume to the box
check the pic below from

runrod1948​

who built a furybox but says that there was some discrepancies on the plans
anyway, what if you remove the pieces i circled in red.

https://www.diyaudio.com/community/threads/live-sound-specific-tapped-horn-thread.131852/page-36
post# 717

View attachment 1130822

I have 2.3m long tapped horns with one 180 degree bend and a 90 degree for the driver and exit.
No reflectors.
Consensus was not needed at these frequencies.
No issues with sound, freq measurements etc.
Have build square ones with more folds since and no reflectors, same comments.