B&C S218AN
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=48603
Printed Date: 27 March 2026 at 5:30am
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: B&C S218AN
Posted By: al_mighty
Subject: B&C S218AN
Date Posted: 13 February 2011 at 4:50pm
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Heyho, i just checked the new speaker designs on bcspeakers.com and found this: http://www.bcspeakers.com/PDF/SUGG/SGG_55.pdf It´s a BR cabinet for 2x 18" Subs with 2 seperated chambers. The upper chamber is like 30% smaller than the lower one. Also they have different length reflex channels. Has enyone ever seen (or ever heard) an attempt like that? Why are they doing that? I don´t suppose, they intend the user to split the frequencies between the 2 speakers, do they? How about the bass reflex delay? Will it still match inspite of the different sizes? All my live I´ve lived by the golden rule to never stack different Subs on the same freq. band. was i wrong? Thanks for input, Al |
Replies:
Posted By: Jez_3phaze
Date Posted: 13 February 2011 at 6:58pm
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I maybe wrong but I'm pretty sure both chambers are tuned around 39 htz. The lower chamber is bigger but has a smaller port, also there is approx 4.5 Ltrs of wheel space to deduct!
so...including ports:
Vb top = approx 133
Vb Bottom = approx 170
I had already simmed the bottom part of this cab for a single cab project.
The plot for each chamber superimpose each other.
Regards...J
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Posted By: MarjanM
Date Posted: 13 February 2011 at 7:06pm
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All of the new high power drivers have a dip at around 70Hz so maybe they tuned them diferently to compensate this. ------------- Marjan Milosevic MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
Posted By: al_mighty
Date Posted: 18 February 2011 at 4:58pm
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Okay, thanks for the input. So all in all, do you think it makes sense? The lower chamber woul probably have stronger infra bass response. Does the upper chamber then deliver a better kickbass? Up to what frequency would you drive these babies? Can i possibly abandon my 15" midbasses, when using those subs? |
Posted By: Jez_3phaze
Date Posted: 19 February 2011 at 2:21pm
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B&C don't seem to say much about this design, other than it's a "Subwoofer"!
B&C FAQ:
Does B&C offer design assistance for speaker cabinets? Sorry, but we do not offer design support beyond the simple speaker
cabinet designs available in the “Resources” section of our web site.
 Red top/Blue Bottom chamber. Ports calculated using cross sectional area and length. Combined sub & kick cab bi-amped, is an interesting idea!
I'm just looking at the the sub atm.
Regards...J |
Posted By: Dub Specialist Sound
Date Posted: 19 May 2016 at 6:31pm
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Anyone have the cut-sheet for this plan and willing to share thanks ------------- 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... |