G Sub in Bass Box pro
Printed From: Speakerplans.com
Category: Plans
Forum Name: Ported Enclosures
Forum Description: Post all your reflex and bandpass and 'other' boxes with holes in stuff here...
URL: https://forum.speakerplans.com/forum_posts.asp?TID=91585
Printed Date: 27 March 2026 at 11:10am
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: G Sub in Bass Box pro
Posted By: MRT
Subject: G Sub in Bass Box pro
Date Posted: 16 April 2015 at 8:45pm
| I'm trying to simulate g sub in bassbox pro to compare it to my own double 18" design. I think I got the measures just right but I get an f3 at 41.62 hz (with PD 186 and Fane the same) It should be lower shouldn't it ?,in the plan it says 36.9 hz. I wonder what Im doing wrong, I have 280 litres Vb. |
Replies:
Posted By: nickyburnell
Date Posted: 16 April 2015 at 8:53pm
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Yep, differences in software sims all over the place. Cab is too small anyhow ------------- It's everything, not everythink! |
Posted By: patryk1305
Date Posted: 16 April 2015 at 9:04pm
| I think your 280 figure is a bit low from looking at the plan. Try simulating with hornresp and compare. |
Posted By: nickyburnell
Date Posted: 16 April 2015 at 9:09pm
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Lot of bracing in there, ports, drivers, I came to the conclusion 290 ages ago ------------- It's everything, not everythink! |
Posted By: MRT
Date Posted: 17 April 2015 at 11:00am
| Yes, G sub is actually quite a small box. I would assume that f3 at 36.9 hz is measured from the actual output? Simulation in Bassbox gives 40.95 f3 with 290 liters, thats 4hz higher than the actual output, just wondering what this means when designing boxes in Bassbox, should I presume that the actual f3 in other designs is lower too, or is this just a margin of error? |
Posted By: Elliot Thompson
Date Posted: 17 April 2015 at 12:17pm
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If you look at the graph listed on the plans, it easily shows the -3 dB mark is within the 40 Hz range. As you use Bass Box Pro it should be quite easy for you to match the plans graphical results to your simulated results since, the graph results derived from Bass Box Pro. Best Regards, ------------- Elliot Thompson |
Posted By: MRT
Date Posted: 17 April 2015 at 12:46pm
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OK, so the -3db stated in the plan is actually from Bassbox simulation? To me it looks like -3db is at 36.9 hz also in the graph. 
I'm using the driver specs from the Bassbox database, could that be the reason for different results?
|
Posted By: odc04r
Date Posted: 17 April 2015 at 12:53pm
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I wouldn't worry too much about sims being more accurate than about about 5Hz. Real world effects of design on port termination etc will likely account for that in error when you build it. |
Posted By: DMorison
Date Posted: 17 April 2015 at 1:16pm
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I don't have it on this computer, but my recollection from modelling in WinISD was that it ended up with Vb ~ 289l (depending on exact style of handle) and Fb about 38-39Hz. Depending on driver used that tends to yield an F3 of 38-40ish Hz, so as ocd4r says, well within the realm of reasonable real world variation. I posted one sim for a chap asking about a different driver in it a while ago here: http://forum.speakerplans.com/g-subs_topic87831.html" rel="nofollow - http://forum.speakerplans.com/g-subs_topic87831.html Note this exposes my propensity to get a litte too invested in the small details - there's probably no real need to worry about setting HPF/EQ frequencies to tenths of a Hz etc, as real world variation will likely swamp that. Hope this helps, David.
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Posted By: MRT
Date Posted: 17 April 2015 at 1:48pm
| Thanks for the info, good to learn about your thoughts on the accuracy of simulations. Im still wondering though, if the actual graph in the plan is from Bassbox, how come my results are different? |
Posted By: MRT
Date Posted: 17 April 2015 at 2:03pm
| Fb in my simulation is 40.73 hz |
Posted By: Elliot Thompson
Date Posted: 17 April 2015 at 3:31pm
The G Sub was designed for the FANE 18 XB with the other drivers (Precision Devices second & RCF third) suggested being another option. The G Sub was designed before Speakerplans came about. At the time of desigining the G Sub, FANE was more popular amongst loudspeaker designers than Precision Devices in the 1990s. The Precision Devices was the second option with the RCF being third (port depth 118 mm) When the FANE 18 XB was discontinued, Rog swapped the FANE 18 XB to third, RCF as second and Precision Devices as first. The lesson to learn here is for all who are looking for pin point accuracy. Instead of building ready made plans, build your own design from scratch using the driver you have at your disposal. Best Regards, ------------- Elliot Thompson |
MRT wrote:Posted By: nickyburnell
Date Posted: 17 April 2015 at 6:29pm
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When the XB was discontinued??? ------------- It's everything, not everythink! |
Posted By: +/-3dB
Date Posted: 17 April 2015 at 6:38pm
| PD186 exist in two versions. Which one are you simming? |
Posted By: MRT
Date Posted: 17 April 2015 at 8:04pm
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I don't know which version it is of PD186, there is only one in Bassbox database. Now this is getting really strange, I'm simulating Fane 18XB (1998) in gsub, I have two designs open, with exactly same drivers, exactly same box specs, but the output is different??? The other one has f3 40.95hz and the other one 44.64hz. What am I missing here? One way to spend friday evening…..  |
Posted By: Elliot Thompson
Date Posted: 17 April 2015 at 8:10pm
I am referring to the 600-watt version that was introduced in the late 1980s and popular in the 1990s. The FANE 18 XB offered today is not the same one as the 600-watt FANE 18 XB designed in the late 1980s from a TS Parameters perspective. Best Regards, ------------- Elliot Thompson |
Posted By: Dub Specialist Sound
Date Posted: 17 April 2015 at 9:28pm
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Many many say that the 600w XB is a better driver/sub/tone ect than the one today... ------------- Musical Roots Reggae Vibration is Life! for music is sound...sound is vibration...vibration is energy... and energy begets life. Therein lies my passion!...MUSIC IS LIFE... |