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Old 10-14-2009, 06:07 AM
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Default Need Advice for box design and specs in Quad Cab Ram with 1 18" RD Heavyweight GP

I'm looking for opinions, recommendation and advice on what would be the best box for me in my truck using 1 18" RD HW GP dual 2 ohm. It will be powered by a RD 3250 amp running at 1ohm.

First let me say its an 05 Ram Quad cab, and has a splitting 60/40 rear seat. I am removing the entire 60% seat, while leaving the 40% side for a passenger.

My max space available is 38" wide x 22" deep x 22" tall (could go taller if needed but prefer 22" as it allows for the seat to recline well.

Based on what I found, these subs tend to like 5-5.75 cu. ft. and tuned anywhere from 30~ish on up. A post I read Steve said he personally liked around 5.25 cubes at 31hz. I've been toying around with sketchup and th RE visual box calculator and The two sketchs I have I think will be fairly close to that. Both my sketch box's are a little big and just a hair lower than my desired fs, but they are not including sub displacement. I am hoping that the displacement will them a hair closer to my desired freqency.

My questions are this....

1. Does it look the port sizing is correct and adequate? I don't really understand fully how to figure out sq. inches or port and this is the best I could do.

2. Should the subs displacement which is not taken into account for on the sketch's raise the fs and reduce the internal cu. ft of the box enough?

3. And this is a big question for me. What would be the best placement of the sub and port? My two sketch's show 1 sub up/ port up with the sub in the center of truck, and the other shows port up/ sub facing forward center of the truck. Both show the port facing up on the pass. side of the box.

Let me state that I'm not going for an extreme spl setup, more of a "shake shit loose/ flex shit" setup, while still sounding somewhat decent with higher 60~ish hz.

If that info helps, which box is a better setup? Maybe they are both crap and you have a better idea? Like I said all advice is appreciated.

Thanks for reading and thanks for the help!
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File Type: jpg port up sub up.jpg (44.8 KB, 17 views)
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Old 10-14-2009, 06:09 AM
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And I just noticed but in both my sketch's I forgot to add my port width. Both sketch's are 4" wide ports. I think all the other measurements are there.
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Old 10-15-2009, 02:54 AM
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Can anyone help me out at all?

I'm really only wondering about sub and port placement, which would be louder, etc.
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Old 10-15-2009, 03:04 AM
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tune more towards 35hz. will get plenty low, and will be much more "musical" because more rap is closer to that frequency. the heavyweight isn't gonna like tuning that low, and no rap is really close to 28hz, i'd definitely go higher. sub placement roughly in the middle from port to the other edge. sub up port up in a truck, lots of testing says that's loudest. could be diff. in your truck, but generally speaking it'll give u consistently the best results. you'll need 60-70sq inches of port, and it'll be very musical.

hope that helps
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Old 10-15-2009, 03:06 AM
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I would suggest sub up/port up.

5.25ft^3 tuned to 31hz with 76.87in^2 of port

32.5"w x 22"d x 22"h external dimensions including a double top baffle.

This does not include any bracing but I would suggest adding some.

This does take into account all port and sub displacement.
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Old 10-15-2009, 03:08 AM
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I would do port up sub forward
5.7ft tuned to 35hz with 75" of port
if you want it to get lower have box sit up against front seat and fire sub back towards cab wall
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Old 10-15-2009, 03:22 AM
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Quote:
Originally Posted by SPY View Post
I would suggest sub up/port up.

5.25ft^3 tuned to 31hz with 76.87in^2 of port

32.5"w x 22"d x 22"h external dimensions including a double top baffle.

This does not include any bracing but I would suggest adding some.

This does take into account all port and sub displacement.

in a quad cab truck? lol louder port up sub forward man!
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Old 10-15-2009, 03:29 AM
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thats the way it was in mine as well
port up sub forward
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Old 10-15-2009, 05:46 AM
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Thanks very much for the great help guys! I think I decided to do the sub forward, port up box.
I made another sketch and I made it a hair big b/c the sub displacement and double front face are not factored in. Also the Fs is also a hair low, but again I'm hoping the sub, etc, will bump it up a hz or two. I calculated 74" of port area. I also decided to decrease the depth from 22 to 20, to make fully sure I have plenty of room for the sub to fire forward and not interfere with anything.

I just have a couple simple questions for you yet.

(.Will the sub displacement bump up the Fs a couple Hz?
(.The sub displ will lower the internal cu. ft of the box around .3 cubes?
(.Is the placement of the sub towards the right side of the face Ok? I usually center them but if its toward the right, the sub will be centered in the vehicle.


Let me know what you think and if there's anything I should change.

Thanks very much again guys.
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Old 10-15-2009, 06:33 AM
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i dont think you're gonna hit 60-70hz to well though if tuned at 35hz... it will hit it, but not to hard
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