B&C S218AN

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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

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al_mighty Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 13 February 2011 Location: Leipzig/Germany Status: Offline Points: 2	Post Options Post Reply Quote al_mighty Report Post Thanks(0) Quote Reply Topic: B&C S218AN Posted: 13 February 2011 at 4:50pm
	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

Jez_3phaze Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 31 August 2009 Location: Derby UK Status: Offline Points: 162	Post Options Post Reply Quote Jez_3phaze Report Post Thanks(0) Quote Reply Posted: 13 February 2011 at 6:58pm
	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

MarjanM Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7816	Post Options Post Reply Quote MarjanM Report Post Thanks(0) Quote Reply Posted: 13 February 2011 at 7:06pm
	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

al_mighty Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 13 February 2011 Location: Leipzig/Germany Status: Offline Points: 2	Post Options Post Reply Quote al_mighty Report Post Thanks(0) Quote Reply Posted: 18 February 2011 at 4:58pm
	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?

Jez_3phaze Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 31 August 2009 Location: Derby UK Status: Offline Points: 162	Post Options Post Reply Quote Jez_3phaze Report Post Thanks(0) Quote Reply Posted: 19 February 2011 at 2:21pm
	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. B&C 18NW100: If i've simmed it correctly. 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

Dub Specialist Sound Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 15 November 2013 Location: Smethwick Status: Offline Points: 4873	Post Options Post Reply Quote Dub Specialist Sound Report Post Thanks(0) Quote Reply Posted: 19 May 2016 at 6:31pm
	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...