small Dual-Bandpass 18 sub

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   Hi Friends

I need the help of the specialists here , i want built a pair of sub boxes for a pair of eminence kappa 18A-1 drivers  but i have sizes limitations to put inside my HT furniture, the max sizes that i can use are: Width 45cms High 60 cms deep 60cms.

I was thinking in a bandpass or a dual bandpass boxes because I cannot direct reflex box because the width of the driver is 45cms  so to put in a direct box need at least 5 cms more.

something similar to poweraudio HP15SW , Small X1 , or to selenium BP6AP1, Or Beyma B04/3. 

I will aprecciate all yours help.

PD : I built almost 2 years ago a 12" box similar to X1 with an Audiopipe TXX-F12 1200Watts driver and receive the support to built here from some users here but specialty form LunchieTey . The sound of tha box is good the box offer a good frecuency respond behind 30Hz but the SPLs are low and is not enough for me that is the reason because i go with the 18 drivers i want now more spls instead frecuency respond with 30 to 40Hz i think that is enough for me.

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csijo Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 28 March 2005 Location: Venezuela Status: Offline Points: 102	Post Options Post Reply Quote csijo Report Post Thanks(0) Quote Reply Topic: small Dual-Bandpass 18 sub Posted: 16 July 2006 at 8:01pm
	Hi Friends I need the help of the specialists here , i want built a pair of sub boxes for a pair of eminence kappa 18A-1 drivers but i have sizes limitations to put inside my HT furniture, the max sizes that i can use are: Width 45cms High 60 cms deep 60cms. I was thinking in a bandpass or a dual bandpass boxes because I cannot direct reflex box because the width of the driver is 45cms so to put in a direct box need at least 5 cms more. something similar to poweraudio HP15SW , Small X1 , or to selenium BP6AP1, Or Beyma B04/3. I will aprecciate all yours help. PD : I built almost 2 years ago a 12" box similar to X1 with an Audiopipe TXX-F12 1200Watts driver and receive the support to built here from some users here but specialty form LunchieTey . The sound of tha box is good the box offer a good frecuency respond behind 30Hz but the SPLs are low and is not enough for me that is the reason because i go with the 18 drivers i want now more spls instead frecuency respond with 30 to 40Hz i think that is enough for me.
	Audio Fanatics, Bass lover

_djk_ Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 23 November 2004 Location: United States Status: Offline Points: 6002	Post Options Post Reply Quote _djk_ Report Post Thanks(0) Quote Reply Posted: 17 July 2006 at 2:27am
	Sell the drivers and buy one for the application.
	djk

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: 17 July 2006 at 4:33am
	Yes you can make two badpass boxes of that dimensions. Google and download WINISDpro and calculate the boxes

csijo Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 28 March 2005 Location: Venezuela Status: Offline Points: 102	Post Options Post Reply Quote csijo Report Post Thanks(0) Quote Reply Posted: 17 July 2006 at 9:26am
	Hello I use winisd to try design but the sizes that give me are too bigs not the i need , and winisd thell me that not handle dual bandpass designs
	Audio Fanatics, Bass lover

Dave Slater Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 28 February 2004 Location: United Kingdom Status: Offline Points: 373	Post Options Post Reply Quote Dave Slater Report Post Thanks(0) Quote Reply Posted: 19 July 2006 at 3:04pm
	it can handle them but you have to do the work manually (which you should be doing on other types of cabinet anyway as the result is only a guide and not nesesssarily the best for your application) to echo _djk_ though if this is for home cinema and you want to get the lows required then pro audio drivers are not the best for the job you need something with a low Fs and a compliant suspension but this will add weight and therefore decrease the efficiency meaning a higher wattage is needed everything is a compromise but for HT duties you need sub frequencies not bass frequencies and pro audio drivers will not give you this something like the adaire tumult is more what you should be after

JD01 Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 23 August 2004 Status: Offline Points: 819	Post Options Post Reply Quote JD01 Report Post Thanks(0) Quote Reply Posted: 19 July 2006 at 5:30pm
	I think a bandpass design isn't suitable at all for small rooms (like your HT room). It will make room modes worse and it won't couple too well with your cabs for lowmids/mids/highs. A sealed design is the most suitable design in the 'conventional range'. If you like the sound of your bandpass, just build another one of them. This will give you 6dB more output. You will need the low frequencies (below 40Hz) for Home Theater.... To go low (40Hz in this case) in a bandpass 6th order with the Kappa18 you need giant cabs.

Dave Slater Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 28 February 2004 Location: United Kingdom Status: Offline Points: 373	Post Options Post Reply Quote Dave Slater Report Post Thanks(0) Quote Reply Posted: 20 July 2006 at 9:20am
	meant to add that about sealed cabs JD01 a sealed box has a 12dB per octave roll off and the average room has a 12dB per octave bass gain essentially meaning that the two together sum to give a flat response because of the cushion of air in the box they will also give you more control leaving you with a more defined bass and no boom