4th order bandpass wall or port back? - Car Audio Classifieds!
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Old 01-21-2015, 01:38 PM
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Default 4th order bandpass wall or port back?

So I was getting ready to start my cuts for my 4th order in a 1999 Tahoe, was going to do a C-pillar box and retain the rear seats, but then......Go big or go home right? So now I have plenty of room to play with. The box will be for 2 18" Sundown Zv.4's. I have heard a few walls in my day but it has been some years now, over the years I seemed to prefer the sound of rear firing boxes in large vehicles and I cant tell you if thats because those boxes were designed better than the walls I heard or if there is an actual change in sound with a large cabin area of a rear firing box. Now that the seats are getting tossed i'll probably be looking for something in the range of 3:1 - 4:1 for the box and would like to hear what you guys think?

Thanks
RB
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Old 01-21-2015, 01:44 PM
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Not an option to do 4 18 flat wall? Or even 4 18"s in a 3:1 4th?
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Old 01-21-2015, 01:45 PM
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2 or 4 door?
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Old 01-21-2015, 02:32 PM
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4th orders acoustically filter alot of the noises that you usually hear in flat walls. It'll going to sound "cleaner" than a flat clamshell with a big port would subjectively. If you could do a 4th from the c pillar, that would even give you some distance between you and the drivers as well as the 4th order bandpass filter..
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Old 01-21-2015, 11:52 PM
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After hearing some options, I believe I will end up with a C-pillar wall, it's got many things going for it that are pluses for me. I'll post up a little info as I get Further into the design.
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Old 01-22-2015, 12:10 AM
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what are your goals.
meaning
numbers on the term lab - and being able to show out real fancy like at a car show demo area
or
are you wanting to enjoy the sounds of your music that are pleasing to you at medium to moderate levels - and have the ability to crank up to demo here and there but mostly its built for your skilled ears to hear the amazing in music - not just pure spl loud

i say this because i just did a c pillar 4th in a burb. yes it filters out mechanical noise and other bits that a flat wall is not capable of but
the air space in the cabbin that is left once you build will be either your sonic enjoyment or your frustration in trying to score on the meter.

b pillar builds take away so much air space from the preasurized areas of the cabbin - its almost impossible to not float shirts in the windows and hair trick on b pillar builds - but same build just further back in c pillar has so much more cubic air space in the cabbin of the viechle to preasurize its much harder to score big numbers on the tl and or also hair trick / float shirts in open windows... bla bla bla - but the sound from the c pillar build will most likely be more enjoyable at reasonable listning levels to the users inside the viechle as there is still sub imaging and some space for the sound waves to travel before they hit you.

either way - your roof will be your biggest enemy. flex and ugly noise will need to be dealt with before building the wall - as once the wall is in - your stuck with whatevers up there and cant get to it.
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Old 01-22-2015, 08:21 AM
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Thanks for the info,my overall goal is not what one would probably expect from someone in there 40's but I want, stupid loud, part of the reason of going with a large ratio 4th order BP, the efficiency gain. To be perfectly honest I do very little listening at low to moderate levels, my morning's and evening's are spent commuting, not overly far but normally At 5 mph and my only sanity comes from my stereo at high volume. For me there is something primal about bass, I absolutely love it. In my original post I mentioned that the walls I'd heard were not as pleasing sound wise as large cabin vehicles which odds why I was contemplating a port back setup. I do believe that I will end up with a C-pillar wall as it just has the most things going for it. I don't care about numbers on the Term lab, I used to do DB Drag back in the day but now it's for commuting and giving a demo to friends and whoever from time to time. I have a very narrow bandwidth in which I listen which in a way is nice, I can have a large ratio BP and still have it musical to me because of my preference to the Hz I enjoy.
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