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W6-2144 - Design time!!
W6-2144 - Design time!!
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Old 10th March 2019, 07:54 AM   #21
perceval is offline perceval  Taiwan
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Quote:
Originally Posted by eusubius View Post
Ok, I'm learning more about Hornresp! Installed... Finally got both records imported to compare...

Question GM; why the big peak at 40hz in your design? The other looks perfect/flat.
Did you add stuffing in LoudSpeaker Design tab?
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Old 10th March 2019, 03:01 PM   #22
eusubius is offline eusubius  Canada
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Haven't seen the loudspeaker design lab yet... I guess I'm still roaming the halls of Hornresp School??
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Old 10th March 2019, 05:14 PM   #23
perceval is offline perceval  Taiwan
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When you are on the first window called Input Parameters, go to the Tools menu, and click on LoudSpeaker Wizard.

Click no for Air Chamber Resonance, and you will get the new wizard window.

On the second drop down menu, find Filling.

Add about 400 of Tail in segment 1 and 2, and 99% for segment 1 Tail and 60% for segment 2 Tail. If you look at the Power window (first menu) you will see the 40Hz peak flatten out. To see a representation of the filling, look at the schematic in the first drop down menu.
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Old 10th March 2019, 07:16 PM   #24
eusubius is offline eusubius  Canada
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Wow, that sounds awesome!!

And to translate it to real life the schematic will be self explanatory? Just use polyfill ?
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Old 10th March 2019, 07:35 PM   #25
GM is offline GM  United States
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The huge peak is somewhat exaggerated in HR, but is due to the increased cab volume [Vb] at the same tuning [Fb] to get increased driver damping.

The sims I posted already have stuffing added, which sufficiently smooths/flattens each sim's response [as opposed to perfectly smooth that usually takes too much 'life' out of it], though again, the room's impact on its performance combined with yours and any others hearing perception may make you want more or less over time.

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Old 10th March 2019, 07:48 PM   #26
silasmellor is offline silasmellor  Denmark
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Is there any way to get a bit more information about the dimensions of the cabinet modeled?
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Old 10th March 2019, 08:00 PM   #27
eusubius is offline eusubius  Canada
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Quote:
Originally Posted by GM View Post
The huge peak is somewhat exaggerated in HR, but is due to the increased cab volume [Vb] at the same tuning [Fb] to get increased driver damping.



The sims I posted already have stuffing added, which sufficiently smooths/flattens each sim's response [as opposed to perfectly smooth that usually takes too much 'life' out of it], though again, the room's impact on its performance combined with yours and any others hearing perception may make you want more or less over time.



GM
Ok, that's what I suspected. I've been reading the Keystone sub and PAL12 subs for awhile and I recall that real world use was much smoother.

So with increased driver damping, you're getting more bass from the same excursion! That's a great idea. Makes me very tempted to build your larger version.

One thing occurred to me - you said it's 57" tall? (Haven't found the dimensions in Hornresp yet, if there are any)

So that's going to be cut lengthwise on a 48*96 sheet, almost 40" needed for one box! I doubt one sheet would even be enough for a pair smaller box design anyway. Unless I go for the pricier 5*5 sheets of BB.
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Old 10th March 2019, 08:12 PM   #28
eusubius is offline eusubius  Canada
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GM, with stuffing then, what would you expect the real world bass performance to be? More like a 3db average boost from 35-70?
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Old 10th March 2019, 10:22 PM   #29
GM is offline GM  United States
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Quote:
Originally Posted by silasmellor View Post
Is there any way to get a bit more information about the dimensions of the cabinet modeled?
It's all in the .txt file:

ID=48.20
Ang=2.0 x Pi
Eg=2.83
Rg=0.50
Fta=0.00
S1=600.00 WxD recommend a golden or acoustic ratio with depth [D] > 1.5x driver depth
S2=600.00
Con=49.82 driver offset point
F12=0.00
S2=600.00
S3=600.00
Con=92.90 rest of cab
F23=0.00
S3=600.00
S4=40.54
Con=0.01
F34=0.00
S4=40.54 vent area [Ap]
S5=40.54
Con=1.80 vent length [Lp] just a hole in ~3/4" thick panel
F45=0.00
Sd=140.00
Bl=5.59
Cms=1.24E-03
Rms=1.65
Mmd=9.13
Le=0.01
Re=6.80
OD=1
Vrc=0.00
Lrc=0.00
Fr=0.00
Tal=0.00
Vtc=0.00
Atc=0.00
Pmax=6
Xmax=3.0

As previously noted, HR can only show the vent going out the bottom, but will actually be ~47.65" i.d. down from the top. If you look at the Power/Chamber/Combined you'll see that there's a 'Path' length distance to account for this.

All dimensions are inside [i.d.], cm.

GM
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Old 11th March 2019, 02:41 AM   #30
eusubius is offline eusubius  Canada
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Thanks for the details GM. It's confusing that Con is used for multiple dimensions. Otherwise I'm sure I'll slowly get the hang of this.

Are there any dimensions for footprint? Or is height & offset the only ID's that really matter?

Can I do the front baffle 3/4", and the sides 1/2 or 3/8" with some bracing throughout?
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