Q 15 enclosure help

[appleyard 0]

Guys

finally going to start building an enclosure for my Q 15. My plan is to do something like this:

http://i161.photobucket.com/albums/t203/wy...enclosure-1.jpg

I am aiming for 3.5 cu. ft net after port displacement with port tuning of 30-33hz (does that makes much difference musically??). My question is:

1. What is the recommended port are for the Q15? I want to make the port as big as possible for more air to move out of the port.

2. Has anyone ever modelled the Q15 in WinISD as everytime I tried to key in the value either I will get some errors or different t/s value. I dont know whether my box will yield linear response.

3. Has anyone (expecially Scott or Nick) can advise on better design than this.

This is the biggest enclosure I can fit into my car (yes I own a small car).

Thanks

[tejcurrent 13]

pinned at top:

http://www.soundsolutionsaudio.com/forum/i...?showtopic=7155 enclosure recommendations.

If you like the lows tune closer to 30hz, it's a matter of personal preference to me.

1. give yourself around 56sqin of port, since that is 3.5cuftx16, and the largest recommended

2 don't like winisd- not very useful for this imo. Just follow the recommendations in that sticky.

3 what car and what dimensions are you making the box?

[appleyard 0]

1. What if i wanted a bigger ones than 56 Sq inch? Would that affect the Q perforamance. I dont mean to have port wars or SPL setup, but just wanna get low and loud.

2. I always use WinISD for port tuning and see the response. But since I'm unable to modelled the Q I have no idea on the ports. Dont ask me on doing the calculation on paper.

3. My car is something made locally (i'm not in the states) and you wouldnt ever heard of it. Just think of it like a mini SUV. I dont get you on the dimension.. but its pretty simple box clearly in the pics.

[tejcurrent 13]

by dimensions I meant the numbers I didn't see the first time I looked at the diagram of your box, my mistake

If you want the port bigger than go bigger, but everyone who stays in the recommended parameters I've talked to has been happy. I don't think you'll see much if any gain by making a larger port than 16sq per cubic foot, just tune low. Why not google 'box tuning calculator' or go to the RE website- I think they're supposed to have a decent one to calculate the length of the port.

Just out of curiosity, what type of car is it? I'm always interested in something I've never heard of, where are you located?

[appleyard 0]

my car is this

http://www.perodua.com.my/our_cars.php?sub_page=kembara

Made in Malaysia dude.

[theabunai 3]

If you mean bigger (the 3.5") i would suggest maybe +4.0 or so (port noise can be a killer)

If you mean more square inch just remember the longer the port the more area you get the lower the tune

So yes if you tune lower then the subs peak freq response it can affect performance..

[tejcurrent 13]

damn, you're right-never heard of it Interesting though. Man, Fi gets around huh?

[appleyard 0]

If you mean bigger (the 3.5") i would suggest maybe +4.0 or so (port noise can be a killer)

If you mean more square inch just remember the longer the port the more area you get the lower the tune

So yes if you tune lower then the subs peak freq response it can affect performance..

I would like to stay around 3.5 cu. ft. net after displacement with bigger ports. Going for 33hz instead cause my current box is 33hz and I like it.

I dont think I will be gaining significant result of bigger port area but hey.. I'm not into comps either. Just wanna make it low and loud for daily. I was thinking that bigger ports will allow more air to be displace via the port correct??