Try to tune it to 18-20hz

[soloxp]

Hey guys. I'm a little new to HT. I have been building seal boxes for over 10yrs...But never builded a ported box and never use a program to build boxes. I have been in car audio for 14yrs and only used kicker subs.....because they put out some deep bass. I builded a box which is external dimensions (H-22) (W-25) (D-17) to get internal volume of 4.3 cu ft. I made it down firing with 4" 13" long port. I need help tuning it to 18-20 Hz. It shakes the whole house damn nice. I went to fry's this weekend and pickup a Velodyne DLS-5000R. Man...I must have gotten a bad one...because my sub blows it away. And I have this amp from partsexpress 300-796



Thanks

[richie00boy]

For 20Hz with a 4 inch vent in that size box your vent needs to be 17.64 inches long.

[soloxp]

Sorry i for got to put what sub i'm using. It's a Kicker comp15" 2005
Here the info...http://www.kicker.com/06/tech-suppor...b%20Manual.pdf

I tryed to edit but i didn't see it.

[Cal Weldon]

The edit button is at the bottom of every post you make but is active for about 1/2 hour only. After that you have to ask us. This one's fine.

[soloxp]

Wow that was quick guys. Thanks for the quick reply richie00boy. I will give that a try as soon as i get home today. Also what you think about this amp from O Audio. http://www.oaudio.com...was thinking about picking 1 up Friday. I like that it has (Room mode control parametric equalization) and Selectable low end EQ/subsonic filter.

[simon5]

If you can put the port on the 25" side or 22" side, I would use this, you don't cut it, keep it full length :

http://www.partsexpress.com/pe/showd...number=268-352

You would get less port noise, and get 20 Hz tuning point too.

BTW, with which software do you calculate port length richie00boy ?

BTW, your link doesn't work soloxp. Oaudio seems to make good amps afaik.

[soloxp]

Sorry about the link....here it is.
I made the port 4" 17.64 long and it did make a big diff.
Hey simon5 so should i make it 22" long instead of 17.64".
I took back the Velodyne and got a new one...but know diff.
This thing will kill the Velodyne DLS-5000R.

http://www.oaudio.com

Also here is the box that i built and amp.

http://home.austin.rr.com/soloxp/images/pic/2.JPG
http://home.austin.rr.com/soloxp/images/pic/4.JPG

[simon5]

No no, the port I recommended using is 18" long, but flared so it's acoustically 17" long.

I just wanted to say that you couldn't install it on the side measuring 17" deep.

You will have less port noise with a flared port like that one.

BTW, I wanted to add that your box is a bit small for the C15 in a home environment. A better box would be 8 cu.ft tuned to 20 Hz. Huge, I know.

[richie00boy]

Originally posted by simon5
BTW, with which software do you calculate port length richie00boy ?

Simon I use the vent designer program I wrote, on my website www.readresearch.co.uk in the utilities section The length formula is one I have seen used in a number of places.

[soloxp]

Hey simon5..I was thinking about that when i was building the box....but i would got kick out the house. Thats the port i have now. I cut it in 1/2. Now it's like a L shap then put the end back on.

I still need to know if this amp is a good one to get. Or is there somthing better then this around the same price.
http://www.oaudio.com


Thanks