Need help deciding on sub

[Inertia]

I want to spend about $300 or less on an 18" subwoofer that would sound good tuned around 20hz for home theater. Could you guys give me an idea. I can do up too 9ft3 on the size of the box before displacements. And would a port that measures 2.5" x 20" be large enough to keep the port noise down?

 

[Inertia]

How about a stereo integrity 18" What size box would I want tuned around 22hz?

 

[annunaki]

The new Dayton 18" fits in that budget range. It is fairly versatile with enclosures as well. Check to see if pierce audio products has an 18" in your range as well. The 1K series may work.

 

[ARES24]

What does the $300 have to pay for? materials/amp/driver

 

[Inertia]

The $300 is for sub only I already have an amp and will have someone make the ported box for me. And will the port be big enough at 2.5" x 20"

 

[jinjuku]

The $300 is for sub only I already have an amp and will have someone make the ported box for me. And will the port be big enough at 2.5" x 20"

You will want to model whatever driver you get...

 

[annunaki]

Don't try to figure your box and vent dimensions before deciding on a driver. In any case, your vent opening dimension is determined by balancing the vent velocity (ideally keeping it below 17m/s with the intended power levels) and the 1st vent resonance (ensuring it is not within your intended bandwidth).

So to make it easy, select a woofer first, model it, and the rest comes into view.


I would however, know what your maximum enclosure size is that you can live with, then prior to purchase model the driver to determine it will fit, after accounting for vent displacement, etc.

 

[Inertia]

I am going with the Stereo Integrity 18". Box wil be 8.6ft3 before displacements. Port will be 2.5" x 20" x 48" for a tune of 20hz. Port displacement will be 2.0ft3 and sub displacement is .25ft3 and bracing will take .35ft3 leaving me with 6ft3. Sound good?

 

[annunaki]

If it looks to model well in that enclosure, and the vent velocity is in check, I would assume it would be fine. What is the 1st vent resonance and what is your lp crossover point?

 

[Inertia]

Not sure how to do the vent velocity or thefirst vent resonance. Crossover point will be 80hz and subsonic at 20hz. All I have is winisd beta. Do I need another program to model with?

 

[annunaki]

You shod be using WinIsd Pro Alpha. Significantly better program, downloads easy, copy your driver registry and paste into the new file. Very simple. If one is not looking at these important areas during the design process they may end up with something they are not happy with

 

[lsiberian]

Not sure how to do the vent velocity or thefirst vent resonance. Crossover point will be 80hz and subsonic at 20hz. All I have is winisd beta. Do I need another program to model with?

I haven't added vent velocity to my program, but it's much easier to use than winisd IMO.

The SI 18 models very well. There was a recent 18" Dayton build TLS designed built by Ares24.

I plan to try the SI drivers once I complete my main speakers, but I can't confirm their capability yet.

 

[16hz lover]

FYI, it would take 1 and 1/2 of another of the Daytons to match the output of the Stereo Integrity driver according to the designer. Have you finished your sub yet?