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Old 10-18-2012, 02:57 PM
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Default 4th order help

Hey everyone, my plan is to build a 4th order for two Zv3 15s, but im still trying to understand about 4th orders.
I want this to be one that can play crazy low, but i don't know how i should adjust the ratios for that. I heard that for a low playing 4th order, use big ratios, as in 4 cubes ported per 1 cube sealed. But i also heard that for a wider playing bandpass and less peaky, use a small ratio, such as 1 cube sealed to 1 cube ported. Or is it supposed to be for a low playing bandpass use big ratios but that are like 4 cubes sealed per 1 cube ported? And i think that you're supposed to tune the ported to whatever the resonant frequency of the sealed part is. I don't know how correct any of this is so any help would be super appreciated.
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Old 10-18-2012, 06:48 PM
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That's actually a pretty good understanding you have. I would highly suggest getting a program to help you out. I got WinISD and it is 99% accurate
to my current build so I am very pleased with it. There are many others, but this one was at least free.

The program will show you what happens when you mess with those ratios you are talking about. It can't hurt you to change them, it will only change the outcome.

and a general rule of thumb, make sure your subs have a Qts. greater than .5
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Old 10-18-2012, 08:23 PM
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Thanks a ton for the info. the program is pretty sweet. Should help a lot
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Old 10-18-2012, 10:19 PM
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Decide how big you rear chamber will need to be to hit peak impedance as low as you want it. Then build your front chamber as big as you can around that number. If needed, you can reduce front chamber volume with bracing or whatever. In general, matching the port on the front chamber will give you the best results for a daily driver. 40-50 hz tuning is usually advised because below that you're shifting the response down into sub-sonic areas and loosing SPL in the range that you're talking about. The goal is to make the enclosure as efficient as possible within the passband without wasting acoustical output on frequencies you don't "need".

The sealed chamber dictates low frequency extension. The front chamber dictates narrow and peaky the response will be on either side of the rear chambers tuning.
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Old 10-18-2012, 10:47 PM
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My favorite low end 4ths have been high ratio - low tuned.
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Old 10-19-2012, 10:04 AM
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Sweet thanks, this info helps a ton. But one question i still have is that if i make the sealed section larger, so it'll play lower, how badly will that effect the woofer's power handling? For instance my zv3 15 is recomended for 2 cubes sealed, but that would give an an fb of 47ish hz. and if i made the box 4 cubes it would lower the fb to 40hz. so can i do this and still have enough suspention to not reach mech limits of full power?
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Old 10-19-2012, 10:11 AM
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No need to get the sealed resonance that low, 46-47 will be good. It will play down to 20hz without an issue too. Remember, it's a sealed box so it rolls off slowly on the low end.
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