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Old 04-05-2016, 11:48 PM
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Default Best sub/port location

I have a 2012 Honda CRV. I am putting four Sundown ZV4 12's in the back. I was planning to have subs up with port back. No plans for a wall. Any recommendations on best sub/port location.
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Old 04-06-2016, 05:56 AM
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I have a ford edge, and have had other hatch backs, I like the sub up port back to protect my subs, but it actually sounds very good that way.
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Old 04-06-2016, 11:33 AM
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Being that your gonna do four. Doesn't exactly leave you a ton of options. I've had good luck in suv's, firing the port out the side. 180 degrees out of phase with the woofer or woofer's. But... Having said that. You probably don't have room for that. Subs up port firing rear would be my next choice. Works great as well. Your gonna be loud with those 4 12's regardless of box orientation lol. I'm curious. do you plan on aero's or Slot port?
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Old 04-06-2016, 11:39 AM
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Obviously Zv4's are not DD's. But We did 4 6'' aeros for 4 9512's on 2 m2's in my buddy's Land cruiser last year. Subs up port back. Was uncomfortably loud. What kind of power are you going to run? More power i'd be a little conservative with port area. Less power.. More port. you could always step up 8'' or 10'' ports. Or a huge ass slut port.
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Old 04-07-2016, 06:23 AM
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What's going on people??

More power = more port and lower power = smaller port!!!!

You are controlling the compression so bigger port = lower compression, lower power = lower compression SO YOU NEED SMALLER PORT WITH SMALL POWER TO HAVE COMPRESSION!!!!!!!!!!!!!!!


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Old 04-07-2016, 11:13 AM
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Or you could have the appropriate amount of port based on the enclosure volume. Irrelevant to power. Just a thought.

And compression is not a good thing, shouldn't be something you shoot for.
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Old 04-07-2016, 11:42 AM
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You don't shoot for compression but it's your Velocity let's say, now without it it you can't have bass, too much velocity and you choke things up, that's why you need to know about your compression and everybody should understand that even with a port as big as the whole world would still compress at tuning but won't compress even .0001hz below or above tuning, that's why SPL one note wonder build the port as big as they can to fight compression at the tuning (which is their PEAK), if you want a wide bandwidth you want compression but the more you get the worse your peak would be (CHOKED UP), it's hard to really measure and best way to do it for beginners is trial and error.

So compression occurs at tuning and it makes things loud, whatever the port was it's gonna compress, but the problem is that below and above tuning you lose compression, so get big port with narrow bandwidth and peaky response or make it small to have compression above and below tuning so you get bandwidth, but it won't be as loud at tuning cuz compression gonna choke it up hard.

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Old 04-07-2016, 03:16 PM
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Fiance has a 2011 crv, I've got an ampere 15 in it on 700watts, sub up port back, 5 cubes net, 95 of Port, soon style. 146 db on my termlab.
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Old 04-07-2016, 04:51 PM
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Try and keep the woofers as far to the rear and outside as possible with the port/ports in the center. I would imagine 8-9 cubes net should do the trick depending on power and where you'd like to tune. A pair of 8" aeros if you plan to compete with a plug that reduces port area to 7" aeros would probably be prime for a daily port area with that enclosure size. Power dependant mind you, as well as tuning dependant. Sub/port placement is kinda goal specific in a way as well so are you building for music or meter score or a combination.
Also, I believe what Hael was touching on about compression was the fact that lower power will not move the cone as much in a "suggested spec" enclosure as a higher power build will therefore you will need to shrink the port to get enough compression to have a bandwidth that is flatter compared to the same enclosure with spl type port area on the same power. Without compression you basically have an IB build as you won't have a pressure differential inside the enclosure vs. outside the enclosure. Too small of a port on high power creates too much compression and beats the shyte out of soft parts from having too much internal pressure on the back side of the cone vs the cabin pressure on the outside of the cone so you lose output and basically negate the increase in power by creating more resistance on the cones movement. If you didn't want compression at all why wouldn't you just run like 40" port per cube or more?
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