Jump to content
BOBO123

PORT TUNE and BOX SIZE

Recommended Posts

I am about to pay for my RP-i 12 " sub so it can be shipped. I want to build a ported box and tune it to 25hz. I will be pushing 600wRMS to it. What size box would be best? Also feel free to offer any other suggestions. Thanks

Share this post


Link to post
Share on other sites

are u getting a rl-i or an rl-p?

if it's the rl-i...i'd suggest about 1-1.25ft^3 with 25in^2 of port tuned to 34hz...

if it's the rl-p, i'd aim for 1.5-1.75ft^3, same port and tuning...

why such a low tuning?

wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee :slayer:

Share this post


Link to post
Share on other sites

that is quite low of a tuning...

i was also under the impression that one should keep the rli 500 and below and 800 and below for "best" reliablity...

Share this post


Link to post
Share on other sites

An RL-i series driver should not be ported with 600wrms of power.

The voicecoil is too small for the amount of thermal stress that could ensue.

However, the RL-i does thrive with low low tuning, and for an RL-i12, I would suggest 3 cu ft, tuned to 22-25 Hz, with 35 sq inches of port area.

Now so far as an RL-p, 600wrms will be right in the sweet spot and mrray's rec's are right on target.

Share this post


Link to post
Share on other sites

wow that is really low tuning :ohsnap:

Share this post


Link to post
Share on other sites

I would prefer the low port tuning because I listen to music that reaches as low as 17 hz and I would like a very flat response curve going down to the 20 hz range. I want the port to be able to control the sub at very low HZ. Plus I lack a sub sonic filter. Add your toughts on performance at 25 hz as compared to 32 hz?

Share this post


Link to post
Share on other sites

Ah, the RL-p12.. in that case listen to mrray's suggestion of 1.5-1.75 cu ft net volume and 25 sq in of port area, tuned to 30-34 Hz. You can go ahead and tune lower, but increase your port area if you do.

For a tuning of 25 Hz, I would suggest at least 30-35 sq in of port area.

Share this post


Link to post
Share on other sites

Thanks Mike. Last question and I will be out of your hair. Will SQ suffer with this tunning of 25 hz? Will their be a flat response curve?

Share this post


Link to post
Share on other sites

Usually, the lower the tuning, the better the SQ, since the"hump" in the frequency response is at a lower frequency. Since it is so much lower, you'll get that loud low bass which is great for home theater but not always the best in-car(to some people) since most music doesn't hit that low.

Share this post


Link to post
Share on other sites
Usually, the lower the tuning, the better the SQ, since the"hump" in the frequency response is at a lower frequency. Since it is so much lower, you'll get that loud low bass which is great for home theater but not always the best in-car(to some people) since most music doesn't hit that low.

i agree with bg...

IMO, in car tuning that low is almost a waste as u lose quite a bit on the upper end. unless u have real strong midbass to pick it up...

personally, i'd keep tuning in the 32-34 hz range. plenty of sq, plenty of low end and the box will peak later so as too keep up one the upper end of the freq response.

wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee :slayer:

Share this post


Link to post
Share on other sites

I think ill tune to 30 hz. I have access to a 12db per octave subsonic filter. What should I set it to ( 20hz 25hz 30hz 35hz)?

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×