sub/port direction

[sanguine79]

Got a 98 k1500 extended cab with a custom HCCA PSI 18 in a box at 8.75 cu ft at 32Hz. I just pulled the back seat out. Sub is currently up and port back. Behind the box where the port is there is 3.5" the wall. Is that enough area or should I go port up sub forward?

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[massivespl]

I would try sub forward port up

 

[adulbrich 5,000+ posts]

How does it sound? Why not try both and compare?

 

[FISHKILLER 10+ year member]

I have same truck almost. Past few years I have had my subs facing back with port up. Many different number and size subs. It hits very hard. I removed my rear carpet on back of cab, deadened the wall very good, covered whole wall with a piece of MDF then reinstalled my carpet. My thinking was to give the sub a nice wall to load off of.

With my ultras and pair of 2ks strapped it was very brutal very close to too painful.

I am now in the process of revamping system and thinking of going with a larger port and bigger box. SUB UP PORT UP.

 

[sanguine79]

Just tried it at real low volume. Best its ever sound but definitely peaks higher. Gonna try at high volume in a bit

 

[sanguine79]

I'll just go with the comment of test everything

 

[adulbrich 5,000+ posts]

^Lol, yes. Best way to do it. We can recommend things based on theory, but orientation is build-specific

 

[sanguine79]

Well I'm back. I did the port back for awhile. I feel like I should still be getting more from it though. Any thoughts on port forward under the front seats?

 

[sanguine79]

Has anyone run it that way? Did it sound alright?

 

[sthib 10+ year member]

I have same truck almost. Past few years I have had my subs facing back with port up. Many different number and size subs. It hits very hard. I removed my rear carpet on back of cab, deadened the wall very good, covered whole wall with a piece of MDF then reinstalled my carpet. My thinking was to give the sub a nice wall to load off of. With my ultras and pair of 2ks strapped it was very brutal very close to too painful.

I am now in the process of revamping system and thinking of going with a larger port and bigger box. SUB UP PORT UP.

The increase in sound was from you deadening and getting rid of some flex. The port is what needs to be loaded not the sub. Most of the sound comes from port in a ported box. Well pressure I guess that's the best way I can explain it.

 

[sanguine79]

Sounds like it would technically be better bouncing off the rear wall. My issue is its really choking out the port. There isn't much room back there for it to breath. I'm wanting to move more air for better hairtricks.

 

[FISHKILLER 10+ year member]

My current box is now subs up, port up. 13 cube after all displacement tuned to 32 hz with 180 inches of port. This sounds the best for me thus far. I do have my whole truck deadened good. At full tilt on heavy bass songs I can start to hear my roof which I don't like.

 

[sanguine79]

Did port forward. Got way more windshield flex, visor flex and the high notes don't **** power now. But now the lows aren't as good and the lows **** power.. But it sounds better. Not sure if I like it or not