[dan711]

I've made a decision on my setup. I'm going to use a 18w x 20h x 52L enclosure (approx 10.5 cu ft) to house a Tempest-X2 15". I want to configure the driver in a downfiring position which should be ok because the box will sit on 6"-8" legs. I will take the slot port starting from the bottom-up about 16" or so and then a right turn down the length of the box.

Is it ok to have a downfiring sub 6-8 inches off a carpeted floor?

How do I configure the slot port length?

dan

 

[dyohn]

What's your desired tuning frequency? How large an opening are you willing to use for the port exit?

 

[dan711]

What's your desired tuning frequency? How large an opening are you willing to use for the port exit?

The port opening can be as large as needed. Not sure what tuning frequency to shoot for; 17-18hz?

 

[dyohn]

I haven't modeled the Tempest X2 yet but you should be able to tune to 17Hz in 10.5 cuft. So let's see... Your proposed enclosure is 18" W, so assuming your side baffles are 0.75" MDF, that means you could leave an opening 16.5" wide. If you make the port 3" tall, then to hit 17Hz you'll need the length to be about 38 inches.

 

[dan711]

I haven't modeled the Tempest X2 yet but you should be able to tune to 17Hz in 10.5 cuft. So let's see... Your proposed enclosure is 18" W, so assuming your side baffles are 0.75" MDF, that means you could leave an opening 16.5" wide. If you make the port 3" tall, then to hit 17Hz you'll need the length to be about 38 inches.

Thanks, David.

I plan on leaving a 16.5" wide opening-3" tall-which will travel up about 17"-then take a right turn for another 21". That sound good? What if the port is longer(say 4-6") what effect might it have?

 

[Mike P.]

4" longer will tune it to 16.25hz, 6" longer will tune it to 16 hz.

 

[dan711]

4" longer will tune it to 16.25hz, 6" longer will tune it to 16 hz.

How will tuning it lower affect overall sound and performance? Tuning it lower starts to affect spl's at the lower range, correct?