side ported enclosures

[crunch1 0]

Ok heres the beef n chedda

In a trunk orientated system how does a (side ported) enclosure perform v/s (sub back port back) or (sub forward port forward) or (sub back port up) for SPL or SQ applications.

Example: Kicker DCVR122 v/s DIY DCVR12 enclosure in various port sub positions already mentioned.

Edited July 10, 2007 by crunch1

[JimJ 11]

Since you're not chasing numbers, it's a little less critical, but I liked hearing Loyd's Aveo with side-firing aeroports. Didn't sound lean in the subbass at all. Of course, that wasn't exactly an enclosed trunk...

[crunch1 0]

What im experiencing with a side ported enclosure in a enclosed trunk is a lack of db's at the dash, but at the same time well rounded lows that blend in well.

I was wondering what the typical sub port arangments are in enclosed trunks in relation to SPL and SQ.

[Aaron Clinton 2,372]

Some of the better street class SPL installs in SUV's and small cars are drivers side loading and rear port, and some are upward fire and passenger side port.

[crunch1 0]

hmmm just a thought what about twin 12" side firing enclosures facing each other with the ports to the rear? As for spacing in my trunk im unable to try this with the 122 kicker enclosure. I was running a idea of placing the amps in between the single 12" side ported enclosures. I mean would they cancel each other out meh just a idea lol

[mrray13 30]

loudest trunk car we did, 99 nissan maxima, involved both the subs and the ports facing the sides. one sub/port facing each side. that was a pair of s12xs and a ma audio hk4000d. that thing killed! was louder, lower and cleaner sounding (smaller box too) then a memphis 4kw on a pair of s12xs with both port and subs rear facing. that was in a 00 regal. similiar electricals as well.

side fire jsut seem to work.

wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

[stratusrt01 0]

I've done 2 trunk SPL setups. For daily driving, it's hard to beat sub back, port back or to the side.

For SPL, subs firing forward, port to the driver's side, playing with the box placement has always yielded the best numbers in my car comparitively, but also sounds like complete crap on music.

[sqguy 0]

For music I always run the sub(s) to the rear it seems. I did have a killer box a long time ago I built with the subs to the side way in back and the port was straight up in center of box. It took up the whole hatch in a little omni (yeah that long ago...). It was about the third time I changed how the box worked, it was 4cf with two 10", originally was 4 10". The port was fairly short with the box so big maybe 3dx4l, or maybe 4" tube not sure. I had to tune it by ear way back then. It was SQ, shook the car nicely, and was a real sleeper as nobody could figure out my little ugly car was the one rattling their windows. Had a flat box with 6x9 on top of it and front speakers too; could open the hatch and stand the 6x9 box up for parties...covered it up out of sight otherwise. I used those same subs IB in other stuff. That was a nice sounding box, it had good bottom. That car kind of made a horn shape from where the subs were, if that helped I don't know. After a while I actually wanted some trunk to use and stopped doing the big boxes in my cars.

[crunch1 0]

loudest trunk car we did, 99 nissan maxima, involved both the subs and the ports facing the sides. one sub/port facing each side. that was a pair of s12xs and a ma audio hk4000d. that thing killed! was louder, lower and cleaner sounding (smaller box too) then a memphis 4kw on a pair of s12xs with both port and subs rear facing. that was in a 00 regal. similiar electricals as well.

side fire jsut seem to work.

wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

ok now im thinking of making a dual ported dual 12" enclosure (one sub and port facing the drivers side and one sub and port facing the passenger side)

was the sub pointed up at say a 15% angle from the port or were they both 90%

[theabunai 3]

MMray, JimJ or DevildD NgsM, Any installer...

How would a subs up port side common chamber 4" Aero in a Hatchback sound ?

would slotted be better...

I have tried port back subs up but the box is pretty much up to the very back of the hatch and i fear that the back of the hatch is hindering the ports performance ? (i would say about a 3~4" between port and Rear of hatch)..

I have room on either side of the box.....

[TribeamConnek 0]

MMray, JimJ or DevildD NgsM, Any installer...

How would a subs up port side common chamber 4" Aero in a Hatchback sound ?

would slotted be better...

I have tried port back subs up but the box is pretty much up to the very back of the hatch and i fear that the back of the hatch is hindering the ports performance ? (i would say about a 3~4" between port and Rear of hatch)..

I have room on either side of the box.....

From what I understood, which I read years ago is that you need to give the port at least the same amount of space as its diameter.

[JimJ 11]

From an SPL perspective I don't know, but I do know there are plenty of people with downfiring ports in home audio builds that don't have 3"-4" of clearance between the bottom of the port and the floor, and they seem to work just fine

[theabunai 3]

From an SPL perspective I don't know, but I do know there are plenty of people with downfiring ports in home audio builds that don't have 3"-4" of clearance between the bottom of the port and the floor, and they seem to work just fine

wow that sounds interesting

[crunch1 0]

From an SPL perspective I don't know, but I do know there are plenty of people with downfiring ports in home audio builds that don't have 3"-4" of clearance between the bottom of the port and the floor, and they seem to work just fine

but doesnt a down firing port in home audio get diffused by having a cone in the path of the port.

[TribeamConnek 0]

I have experimented with that before and it sounds good. I would think that the sound travels different in a house though. They are normally placed like 1 1/2in off the floor and though they work well when I tried the same thing in the car the bass seemed stay in one spot. It seems like it works better in cars if you are going to be sitting real close to the enclosure. My home theater sub is front fire port down and it is loud.

[sqguy 0]

It would be interesting to take a meter and a smaller box, just move it around and see what produced more in the front seat. I know that some cars sure give more, and usually (for music, in my experience) the back of those cars/hatches make a horn type shape. The rear glass is usually sloped. But that is just me by ear and every car is different. And, might just be certain frequencies that are propagating too.

[JimJ 11]

From an SPL perspective I don't know, but I do know there are plenty of people with downfiring ports in home audio builds that don't have 3"-4" of clearance between the bottom of the port and the floor, and they seem to work just fine

but doesnt a down firing port in home audio get diffused by having a cone in the path of the port.

I'm not really sure what you mean...

[crunch1 0]

I was just referring to the port like at the bottom of this Yamaha.

well I guess you really cant call it a down firing port just the sub is my bad. heres a nice outlaw audio LFM-1 down firing ports

Edited July 13, 2007 by crunch1