tell me what do you think

[LION SQUAD SOUND]

Ok guys ya'll been a big help so I finally came up with some information what do you guys think. I will be building 21 inch hog scoop with 18sound 21LW1400 driver.

 

[freddi]

fwiw, here's what I got from your input screen. It looks to be designed for kick duty, tuned ~64Hz and would have pretty good output at nominal 1500w peaks

(would you have a link to its plan?)

 

[Brian Steele]

A 21" speaker kick-bin?

Seems like a waste of a driver....

 

[freddi]

@LION SQUAD SOUND - as an alternative you might ask Matthew Morgan J either at Diyaudio - or on Facebook at The High Order Quarter Wave Society for a Paraflex option to a scoop

High Order Quarterwave Society (DIY Bass A-Z) Public Group | Facebook

 

[freddi]

Hi LION SQUAD SOUND - is your intent to build a kick-bin? - or a speaker which can play below 70Hz relatively flat? How high must it play? What are its size constraints?

 

[LION SQUAD SOUND]

A kick bin wasn’t what I was going after. I wanted to build a 21 inch hog scoop. But the problem that I am having is what is a hog scoop is it a TL design TH design or a rear loaded horn design.

 

[freddi]

the speaker described in your input screen has a "short" 1.25 meter path. With the speed of sound ~343M/s its quarter wave is 343/(1.25*4) ~69Hz.

Below is the input for an 18" driver hog scoop and its path is roughly twice of your input

Can you post a drawing or link to a drawing of the cabinet you want to examine with hornresp ?

 

[LION SQUAD SOUND]

Google Image Result for https://www.freespeakerplans.com/images/stories/articles/hog_scoop/hog_scoop.jpg Basically this is the plans but scale it for a 21

 

[freddi]

thanks - If one scaled that by 1.17X to fit a 21" then the result would be awfully big and cumbersome https://i.imgur.com/7tXFqaq.png

Look at this Speakerplans discussion from a few years back on developing a practical 21" scoop

If you're able to move it or its stationary then you or someone can make a hornresp model and
see how it looks with the 21LW1400

21'' HOG SCOOP desing help - Speakerplans.com Forums - Page 1

 

[LION SQUAD SOUND]

And that is why I see 21 in super scoops. Yeah I will stick with the super scoops since I my sound system will be mobile.

 

[snappyturtle]

i dont recall any of the scoops from speakerplans reaching much, if at all, below 50hz. not sure what advantage theyre giving, but youre sacrificing extension.

 

[LION SQUAD SOUND]

With good tuning and building the box to that speaker specs you can reach below 50hz

 

[GM]

Basically this is the plans but scale it for a 21

It's a TH.

GM

 

[LION SQUAD SOUND]

Ok so now it make sense

 

[freddi]

scaled 1.17:1, I get about a 2.8->2.85M path for a 21" version - roughly a 30Hz 1/4 wave.

one the model is established, 21LW1400 can be plugged into hornresp along with the scaled cabinet's width - then one can use a "wizard" (!) to examine the effects upon response from narrowing the whole cabinet - it may look better in some instances

 

[GM]

FWIW, did a quickie 18sound 21LW1400 parabolic TH tuned to ~40 Hz to 'hit/slam' at 50 Hz [or does it need to be higher], so considerably smaller than the 18" at ~237 L net and of course won't play as loud.

Note: driver may not physically fit, so S1 may need to be bigger.

GM

 

[freddi]

GM - that's a fat little hog lots of punch - should handle 1500W peak with ~11mm @~56Hz movement. How would it translate to wood for LION SQUAD SOUND ? How might it sound?

21LW1400 would kinda work in a Karlson (lol) - scaling Acoustic Control's 115BK by 1.4
makes a K-coupler about the size of GM's parabolic TH - but tuning is somewhat below 40Hz
so needs to be tuned higher for punch

 

[GM]

Dunno, don't have Excel loaded to use Brian's folding SS, but being parabolic will be simpler than the expos.

GM

 

[Brian Steele]

GM - that's a fat little hog lots of punch - should handle 1500W peak with ~11mm @~56Hz movement. How would it translate to wood for LION SQUAD SOUND ? How might it sound?

Semi-inductance is going to change the response of that horn a bit. I've modified the sim to include some semi-inductance parameters I derived from the published impedance curve for the driver. They're not totally accurate (deriving them using ZMA data would be much better), but better than not using them at all.

 

[freddi]

Hi Brian and GM - I was looking at scaling the posted hog scoop schematic by 1.17:1 for OP's 21LW1400 but goofed and entered things "ND-wise"

might you re-arrange this expansion for proper TH sim ?

that lossy LE sag looks right - (this is a 4.5" coil ?)