assisted alignment/b6 loading

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   Hello people..
im thinking about trying this assisted alignment / b6 loading.
And thought it would be cool to do a guide with do's and dont's
But being a noob myself (fitted with a laptop, soundcard and a ecm8000)

and only having this as a guide
http://www.prosoundweb.com/article/print/the_extremes_utilizing_dsp_on_the_low_lows_and_high_highs_of_loudspeakers

can anybody bring some info to the table ?

any help appreciated.
 (especially this)
"An alternate approach to merely building and porting an enclosure is to critically tune the enclosure in conjunction with a second-order (or higher) filter, thereby creating a B6 " (whats a critically tuned enclosure?)

will post a guide when finished.

best regards

Daniel Jensen

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
el_dj Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 30 November 2007 Location: Denmark Status: Offline Points: 176	Post Options Post Reply Quote el_dj Report Post Thanks(0) Quote Reply Topic: assisted alignment/b6 loading Posted: 10 July 2014 at 12:53pm
	Hello people.. im thinking about trying this assisted alignment / b6 loading. And thought it would be cool to do a guide with do's and dont's But being a noob myself (fitted with a laptop, soundcard and a ecm8000) and only having this as a guide http://www.prosoundweb.com/article/print/the_extremes_utilizing_dsp_on_the_low_lows_and_high_highs_of_loudspeakers can anybody bring some info to the table ? any help appreciated. (especially this) "An alternate approach to merely building and porting an enclosure is to critically tune the enclosure in conjunction with a second-order (or higher) filter, thereby creating a B6 " (whats a critically tuned enclosure?) will post a guide when finished. best regards Daniel Jensen
	Old twat, with an interest in light & sound

all bass Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 11 October 2012 Location: the Netherlands Status: Offline Points: 1845	Post Options Post Reply Quote all bass Report Post Thanks(0) Quote Reply Posted: 10 July 2014 at 1:38pm
	I can't really help you on this subject but try to read the posts of the late Tony Wilkes as he used this technique on his Q series boxes. Also DJK has commented on the B6 allignment quite a few times.

bee Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4549	Post Options Post Reply Quote bee Report Post Thanks(0) Quote Reply Posted: 10 July 2014 at 2:05pm
	b6 alignment, is very good, hard to perfect, but if 100% correct works very very well, and will add 10hz to your bottom end... you need to take the box volume and port size into consideration, when using digital lms, adding slopes and filters at port tuning.... Not all drivers are suited to this type of alignment.... Edited by bee - 10 July 2014 at 2:28pm
	https://www.elements-audio.com

bee Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4549	Post Options Post Reply Quote bee Report Post Thanks(0) Quote Reply Posted: 10 July 2014 at 2:18pm
	B6 alignment B6 standing for 6th order butterworth. There was an AES paper written by Don Keele, well worth a read.
	https://www.elements-audio.com

el_dj Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 30 November 2007 Location: Denmark Status: Offline Points: 176	Post Options Post Reply Quote el_dj Report Post Thanks(0) Quote Reply Posted: 10 July 2014 at 2:48pm
	bee... when saying that not all drivers are suited... what do you mean... limited by electical conditions ? mechanical condition ? spirits in a speaker... ? :) i mean, what sets it appart other than ts data. ? real life testing ?
	Old twat, with an interest in light & sound

bee Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4549	Post Options Post Reply Quote bee Report Post Thanks(0) Quote Reply Posted: 10 July 2014 at 4:25pm
	el cheapo drivers lol... quality reflex drivers from the likes of pd, b&c, bms etc will all be fine. one point to not is, don't tune the port lower than the fs of the driver.... or add eq etc lower than the fs...
	https://www.elements-audio.com

bee Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4549	Post Options Post Reply Quote bee Report Post Thanks(0) Quote Reply Posted: 10 July 2014 at 4:32pm
	Before tony passed I was working with him on the theory of rear port alignment, with the b6 alignment rule....
	https://www.elements-audio.com

simonh Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 07 November 2010 Location: Essex Status: Offline Points: 1772	Post Options Post Reply Quote simonh Report Post Thanks(0) Quote Reply Posted: 10 July 2014 at 6:36pm
	A number of the old logic systems bins use B6 alignment. As mentioned before, DJK knows a lot about this topic as I believe he uses it on the system he built.

Keen Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 30 May 2011 Location: Brisbane, Aus Status: Offline Points: 1271	Post Options Post Reply Quote Keen Report Post Thanks(0) Quote Reply Posted: 11 July 2014 at 1:02am
	Also search for PPSL topics, they can use B6 allignment. teslaman gives a guide to dsp settings for such methods in the topic below, along with ever-valuable knowledge shared by djk. http://forum.speakerplans.com/push-pull-slot-loaded_topic54000_page3.html

Wikl109 Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 29 April 2009 Location: Yorkshire Status: Offline Points: 982	Post Options Post Reply Quote Wikl109 Report Post Thanks(0) Quote Reply Posted: 13 July 2014 at 2:15am
	My 2p worth on this, people always mention the benefits of adding this B6 Eq boost but the down sides of doing this never seem to get talked about. I used to have my system set up like this. The correct steep high pass filter and a narrow Q big boost at the port tuning frequency. What I found was that although it did give a big boost in output around the tuning frequency it also made the box sound very 'boomy' and one note. It also ate up lots of amplifier power (reducing overall system headroom) and made port noise a big problem. Sometime back I posted about how could I improve the 'kick' response of my system. The way I did it in the end was to get rid of the B6 Eq boost. It meant I had loads more headroom across the full range of output from the cab. Even though the driver is kept within it's excursion limits adding a boost like that needs lots of amp power. I'm a lot happier with the sound I get now i've gone to just using a not so harsh high pass slope and virtually no EQ boost.
	Cheers, Chris.

dlyxover Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 14 June 2007 Location: Liverpool Status: Offline Points: 1526	Post Options Post Reply Quote dlyxover Report Post Thanks(0) Quote Reply Posted: 13 July 2014 at 3:15am
	Id agree with wikl109, b6 box do sound good to a point but are easier to push over the edge i think. but a b6 assisted box works very well. By b6 assisted I more mean the eq at the tuning frequency, a narrow Q with a boost of 3-4db i think adds depth to the sound but keeping the punch and tone of the box.
	Lignum_ww@icloud.com GNKaudio@icloud.com

Wikl109 Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 29 April 2009 Location: Yorkshire Status: Offline Points: 982	Post Options Post Reply Quote Wikl109 Report Post Thanks(0) Quote Reply Posted: 13 July 2014 at 3:54am
	I think it was about 6db I was adding. It did sound good, certainly with music that needed that 'rumble factor'. It just didn't sound very natural and was clearly at the expense of overall system headroom. Another thing that I never mentioned is the dreaded group delay. Have a look at the group delay when you're adding an EQ boost like that. No doubt this was further contributing to the boomy sound I felt the B6 alignment gave.
	Cheers, Chris.