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View Full Version : Port back vs up: The horse is still alive.



gckless
02-07-2013, 10:46 AM
Doing two 15's (built by Zeuslicious, http://www.caraudio.com/forums/subwoofer-classifieds/563401-15-modded-3hp-sub-w-green-ti-basket-long-beefy-coil-tc-spaced-spiders-dd-cf-cap.html) in a Blazer. Comparing sub up/port back to sub up/port up. Couple questions. Slot would be about a 4"x35.5" port, for a tuning of 30Hz. Not sure on port WxH relationship, my numbers may very well be off.

For port back, how far from the rear hatch would the box need to be? I have heard double the port height. Space is somewhat limited, so I need as much as I can get. How does space needed between the box and the hatch compare in a slot vs. aeros?

For port up, the box would be butted up against the rear hatch, like this:

http://i723.photobucket.com/albums/ww236/gckless/DSC03814_zpsbf2c719f.jpg

How would this sound vs. port back? I'm looking for it to sound good, meaning minimizing rattles, no cancellation issues, digging deep, etc. Not too worried about it being loud, I'm not chasing numbers and it should get loud enough either way. I want it to sound as good as possible.

Buck double 07 pro-rabbit TaylorFade

pro-rabbit
02-07-2013, 11:40 AM
It will sound just fine, you just have to tune differently is all. That setup pictured would be louder with port back in 99% of most cases though(to the ear and meter).

wickedwitt
02-07-2013, 11:42 AM
It will sound just fine, you just have to tune differently is all. That setup pictured would be louder with port back in 99% of most cases though(to the ear and meter).

This, all day, every day.

Port back and you will have a great little wind machine.

brandon_s0854
02-07-2013, 11:43 AM
Agreed. I would do port up as pictured.

wickedwitt
02-07-2013, 11:45 AM
Agreed. I would do port up as pictured.

You just said agreed, then disagreed w/ both of us :uhoh:

double 07
02-07-2013, 11:49 AM
I totally agree with the other guys....port back seems to play quite loud and if tuned correctly will slam the lows like nobodys business......If will not sound bad either way but if it was mine I would do port back....

brandon_s0854
02-07-2013, 12:12 PM
You just said agreed, then disagreed w/ both of us :uhoh:

My bad. Sometimes I think one thing and type another! :typing:

gckless
02-07-2013, 12:20 PM
Hmmm, alright. Will make fitting the size box in there I want a little difficult, and I'll have to deaden the crap out of the hatch, but thanks for the input. Looks like port back is the way to go.

wickedwitt
02-07-2013, 12:23 PM
Hmmm, alright. Will make fitting the size box in there I want a little difficult, and I'll have to deaden the crap out of the hatch, but thanks for the input. Looks like port back is the way to go.
Get you some sheet metal and weld it to the hatch. Problem solved.


Otherwise, 2-3 layers of deadner.

hispls
02-07-2013, 12:32 PM
I've had better luck getting loud in my Jeep porting to the side (into a corner is optimum on the meter). My best sounding box to date ported up (but on a side). Many people seem to have good luck firing to the rear though.

The only way to know for sure is to buy a meter, build both boxes, and experiment with position and aiming. Way too many variables to guess if someone doesn't have the exact same gear in the exact same ride and has already tested all options.

gckless
02-07-2013, 12:36 PM
I've had better luck getting loud in my Jeep porting to the side (into a corner is optimum on the meter). My best sounding box to date ported up (but on a side). Many people seem to have good luck firing to the rear though.

The only way to know for sure is to buy a meter, build both boxes, and experiment with position and aiming. Way too many variables to guess if someone doesn't have the exact same gear in the exact same ride and has already tested all options.

PR has the exact same vehicle :up2somet:
Don't know how much testing he's done though.

What Jeep do you have?

tdford5
02-07-2013, 12:36 PM
what about in a s10 extended cab..is that the 1% rabbit..lol

pro-rabbit
02-07-2013, 12:38 PM
what about in a s10 extended cab..is that the 1% rabbit..lol

Well we are talking about blazers here lol...

If you fire your port back in a S10...well you have other issues :nerd:

k_schutte
02-07-2013, 12:39 PM
Only experience I have with this is my durango. Had slot port up like pictured doing 149's. Ended up switching to three 6" aeros facing back, about 4"-6" from the hatch and did 152.8 sealed. Only thing thatchanged was the port, that was an 18" BTL on a DD Z1. Could have done better too as that was just dropped in, no testing at all and it was actually oozing glue cuz I literally built the box on the back on the way to the competition.

gckless
02-07-2013, 12:42 PM
Only experience I have with this is my durango. Had slot port up like pictured doing 149's. Ended up switching to three 6" aeros facing back, about 4"-6" from the hatch and did 152.8 sealed. Only thing thatchanged was the port, that was an 18" BTL on a DD Z1. Could have done better too as that was just dropped in, no testing at all and it was actually oozing glue cuz I literally built the box on the back on the way to the competition.

Wow, good to know. How did each way sound on music though, or were you only doing burps? It's my DD, so I want it to sound as good as possible.

macsdad
02-07-2013, 12:54 PM
I have a rf t2 12 in a 2cuft box ported at 33hrtz, sub up port back in a hatchback, and i have the box as close to the hatch as possible without it hitting it when i close it. It fuqn pounds, tried it everywhere in the hatch, this placement was the best. ssteele built the box.

wickedwitt
02-07-2013, 12:54 PM
If you want it to sound good you need AT LEAST 6 horns under the frame, so everyone in SA can hear you.

pro-rabbit
02-07-2013, 12:55 PM
If you want it to sound good you need AT LEAST 6 horns under the frame, so everyone in SA can hear you.

obviously you have not been to heatwave.... that setup would still not be loud enough down there :crap:

gckless
02-07-2013, 12:58 PM
If you want it to sound good you need AT LEAST 6 horns under the frame, so everyone in SA can hear you.

I was thinkin atleast 6 per side.


obviously you have not been to heatwave.... that setup would still not be loud enough down there :crap:

That's how it is around here huh? What a shame. I haven't heard anything like that yet though driving around here.

wickedwitt
02-07-2013, 12:59 PM
obviously you have not been to heatwave.... that setup would still not be loud enough down there :crap:

I have. I said sound good, not get loud. He needs 24-30 horns to demo at heatwave.

---------- Post added at 10:59 AM ---------- Previous post was at 10:58 AM ----------


That's how it is around here huh? What a shame. I haven't heard anything like that yet though driving around here.
Drive around downtown for a bit, you'll find some gangstas

stevew007
02-07-2013, 01:15 PM
sorry but 2 15's do not sound good (sq) in any way.my second thought is if you are not worried about numbers you should worry about looks then! with port back you loose a lot of usable room,you cant do nice trim panels the rear gate will rattle like crazy no matter what you do (with in reason).if you go port back you need alot of room between the port and the hatch to get a good wave and air movement. i can keep going on why not to port back but im sure you get the idea

wickedwitt
02-07-2013, 01:18 PM
sorry but 2 15's do not sound good (sq) in any way.

http://images.wikia.com/theamazingworldofgumball/images/0/0c/GTFO.png

stevew007
02-07-2013, 01:26 PM
http://images.wikia.com/theamazingworldofgumball/images/0/0c/GTFO.png

and i bet that system in your sig "sounds good" hahaha dont get but hurt over it.how many SQ vehicles run 15's? my idea of sounding good and others ideas are far apart. the last system i had that sounded good (FAR FROM SQ) was my wifes eclipse with DD 9510 ported and Memphis big belle turn down the gain for a good even sound.

dbeez
02-07-2013, 01:33 PM
Hello. Just thought I would swing by

wickedwitt
02-07-2013, 01:35 PM
and i bet that system in your sig "sounds good" hahaha dont get but hurt over it.how many SQ vehicles run 15's? my idea of sounding good and others ideas are far apart. the last system i had that sounded good (FAR FROM SQ) was my wifes eclipse with DD 9510 ported and Memphis big belle turn down the gain for a good even sound.

I don't remember him saying this was an SQ competition system. Yes, they sound wonderful, they are musical. They reproduce the sounds without distortion at high volumes. That's all I ask of them. Size of the driver doesn't automatically tint the reproduction of the sound... Smaller drivers simply take less motor and less power to be accurate. That is the only real difference. Soft part weight has little to do with actual sound. Size under high excursion does offer more chances for cone contortion, which is where the illusion of "big subs can't sound good" comes from. Well designed soft parts will reproduce the same sound in larger cones as they do in smaller.

EDIT: As a matter of fact, I can displace the same amount of air with less excursion than your 9510 did, therefore my subs would be less subject to tonal anomalies.

gckless
02-07-2013, 01:40 PM
I don't remember him saying this was an SQ competition system. Yes, they sound wonderful, they are musical. They reproduce the sounds without distortion at high volumes. That's all I ask of them. Size of the driver doesn't automatically tint the reproduction of the sound... Smaller drivers simply take less motor and less power to be accurate. That is the only real difference. Soft part weight has little to do with actual sound. Size under high excursion does offer more chances for cone contortion, which is where the illusion of "big subs can't sound good" comes from. Well designed soft parts will reproduce the same sound in larger cones as they do in smaller.

EDIT: As a matter of fact, I can displace the same amount of air with less excursion than your 9510 did, therefore my subs would be less subject to tonal anomalies.

I'm not competing in anything, just want it to sound good to me. Want my install job to lend itself to make it sound good, not specifically be loud.

wickedwitt
02-07-2013, 01:43 PM
I'm not competing in anything, just want it to sound good to me. Want my install job to lend itself to make it sound good, not specifically be loud.
Don't lie, you'll be happy if you don't come across anyone louder than you...

04murdalanche
02-07-2013, 01:43 PM
hispls ; funniest avatar ive seen in a minute lmao

stevew007
02-07-2013, 01:46 PM
I'm not competing in anything, just want it to sound good to me. Want my install job to lend itself to make it sound good, not specifically be loud.

my point still stands. if you dont compete worry about looks and usable space. either way you design the box it can be made to sound good to you.

wickedwitt
02-07-2013, 01:49 PM
my point still stands. if you dont compete worry about looks and usable space. either way you design the box it can be made to sound good to you.

He will get better quarter wave response by porting back. He will get much better output by not having the subs and port on the same plane. I agree with you that the hatch is going to cause problems with noise, but that can be alleviated and would be the best option given his cabin.

pro-rabbit
02-07-2013, 02:16 PM
and i bet that system in your sig "sounds good" hahaha dont get but hurt over it.how many SQ vehicles run 15's? my idea of sounding good and others ideas are far apart. the last system i had that sounded good (FAR FROM SQ) was my wifes eclipse with DD 9510 ported and Memphis big belle turn down the gain for a good even sound.

I would bet there are more then you think actually. I know I have personally judged several in the past few years.

k_schutte
02-07-2013, 02:40 PM
That was on music. Some eminem song, something like 40hz.

stevew007
02-07-2013, 03:03 PM
I would bet there are more then you think actually. I know I have personally judged several in the past few years.

how many have won? how many champs out there run 15's? how many champs "use" more then 1k on the sub stage? when i say "use" I dont mean that they have 2k on tap.

anyways this can just go on and on and on because SQ is based on someone listening to the setup playing a certain song.so what one says "sounds good " might not sound good to another.

sorry for the thread thrashing! on with the build

wickedwitt
02-07-2013, 04:09 PM
http://cdn.memegenerator.net/instances/400x/27923015.jpg

hispls
02-08-2013, 12:41 AM
PR has the exact same vehicle :up2somet:
Don't know how much testing he's done though.

What Jeep do you have?

If PR has the same vehicle I'd suspect he has tried enough variables to have a good idea what's optimum.

I drive 97 Grand Cherokee. My old one finally died and I just got another one... this one has leather seats and I'm expecting that may change things slightly. I'm going to do more testing after I'm done sugaring this spring.

gckless
02-08-2013, 11:06 AM
If PR has the same vehicle I'd suspect he has tried enough variables to have a good idea what's optimum.

I drive 97 Grand Cherokee. My old one finally died and I just got another one... this one has leather seats and I'm expecting that may change things slightly. I'm going to do more testing after I'm done sugaring this spring.

That's what I'm thinking as well. I've been discussing some options with him.

And leather seats changing things? Man, **** SPL. Lol.

hispls
02-08-2013, 11:16 AM
That's what I'm thinking as well. I've been discussing some options with him.

And leather seats changing things? Man, **** SPL. Lol.








Not even sure that's what I'm going for this year, but if i do, supposedly leather seats gain. I expect having newer gaskets on doors and windows and no cracked body panels will help as well. If all it does is shift my peak freq by a couple cycles, my usual strategy for sounding good should work well enough.

gckless
02-09-2013, 11:44 AM
Not even sure that's what I'm going for this year, but if i do, supposedly leather seats gain. I expect having newer gaskets on doors and windows and no cracked body panels will help as well. If all it does is shift my peak freq by a couple cycles, my usual strategy for sounding good should work well enough.

That's just too much to think about for me. I'll stick to my daily systems.

pro-rabbit
02-09-2013, 11:49 AM
Not even sure that's what I'm going for this year, but if i do, supposedly leather seats gain. I expect having newer gaskets on doors and windows and no cracked body panels will help as well. If all it does is shift my peak freq by a couple cycles, my usual strategy for sounding good should work well enough.

In the blazer I gained when we switched to leather seats..but the 24 10" tahoe build lost almost a full db when he switched.