duanebrow

I would say that should be fine.

Go to Facebook and find their page. You can dl a windows 7 version there.

With WinISD you need to let it calculate most of the specs. Just enter re, SD, qes, qms, fs, and Vas. You can also enter xmax and pe.

I found out why Hornresp showed a higher db number. I was modeling in 1/8 space. (this is for corner loaded horns.) So the numbers were off.

Even at 1500 watts 2x 11"x4.5" by 13.7" ports (tuning to 30 hz) you shouldn't have any noise or compression issues. Smaller sized ports would allow making a flange, making it easier to support changeable ports. I used the box volume of 15cf. I don't really trust the modeling software with this size of box - so I highly suggest making a removable port system. I did look at higher tuning, but unless your SW peaks at 50 hz it doesn't look like it will help much.

Bandpass like bigger boxes with this sub. Can you tell me more about what loading issues you would have?

Ports look like 20" long. If you go with single thick walls, accounting for bracing and subs. 30 Hz tuning. I would use plywood and heavy bracing over two layer walls.

wow that is a tight fit! LOL I will see what I can come up with for port size.

For a box this size internal distance could be an issue. Please give dimensions of your box and the layout of the wall. Also you should plan on making the port removable so you can fine tune the box.

Depends on the specs of the subs. You won't get near as much cabin gain in a house as your car. If you need to use what you have you need to be able to use software like WinISD to get a good FR for your house. If you want to step it up a bit more then you can use LIMP (part of ARTA) to measure T/S specs of the subs you have.

It will be ok.

yep, no need to spend more money. what did you come up with for the box?

I would port it. I think they mean use 2" PVC 7" long. Don't forget to subtract the port and driver displacement.

That is for 2. I have not tried to actually fit this design in a drawing. I think it could be a challenge to make the subs fit. I have found that splitting one of the chambers helps. (normally the ported one.) Then you can face the subs toward each other. This will need to be modeled to get the correct port size and tuning if you do.

I modeled the band pass box in Hornresp. It is more advanced than WinISD. It came out about the same.... The biggest difference is that Hornresp said the box was about 8db more efficient! I think I might have messed up somewhere. But if not that would be awesome!

Ok this is what I have for Bandpass:

Just replace the rear deck with a speaker grill.

The size could make noise at max output below ~33hz. I normally just make an L shape. I picked the size so that you can use the sides of the box as 3 sides of the port. (I have not done any calculations as to port displacement. So the length could be a bit off. It is modeled at 4.5cf net.) Here is what I modeled (I didn't include the 34 hz tuning) I added a 4th order band pass model also. Notice how it looks more like the sealed box than the ported. It should sound about the same also - just louder. Size is about the same as the ported box. If you want the specs on a bd type box just let me know. Please under stand that this is just a tool. These models are what the box will output while sitting outside. You will get louder in a car, but the gain is not a nice even thing. If you can measure the fr of your current box then you could see better how these designs would improve the sound... or not.

I will check on the air speed @ 1700 watts. I don't think that it will be a big deal. Going with a 3" wide port will require about an extra 5" of port length. This should fit fine. Do you know how low you want to go? I was aiming at 30 Hz when I modeled the lower tuned box. It should be fine down to about 25 Hz. If you want to go lower, tuning should be lower.

Just use the smaller of the two. For round ports just use the port diameter.

I'm on my phone, but that looks right. When you add cabin gain the sealed will be the flattest. But if you like that or ported is a matter of opinion. As far as the ported box I like the the lower tuned one better. If you will be listening to anything that goes down to 30 Hz I would go with that one. As far as the port area I used 1200 watts rms as the system power. With this much power the ports are big enough. If you go with a lot more power then you might get some port compression.

Using your max box size I came up with 4.5cf net. I would suggest using this size box. Tuning to 34hz (15.5 x 3 x 18L) gives you a nearly 5db boost in the low 40's. This could make the box sound boomy. I like the look of a lower tuning for this sub. Tuned to 29 hz (15.5 x 2.75 x 24L) lowers the boost at 40 to 3db and it is only 2db below that peak at 30 hz.

I will help you get WinISD going. The specs you need to enter are - re (just enter 4 in this case.), SD, qes, qms, fs, and Vas. (WinISD will calculate all the other specs for you at this point.) Then you should also enter xmax and pe.

http://www.incrimina...udio.com/li.htm I found T/S specs here. I don't know if they are correct. Is this the model you have? Ok that is old. I found them at SSA. Anyway 12x4 port would be about 31.5" long in a 3cf box. See if you can get move space after you subtract the port. That is plenty of port area if you are giving them 1200watts total. Also for the latest version of WinISD: http://www.facebook.com/WinISD

Now you see why people just pay someone to design a box for them. Don't forget that you must subtract the port from the box volume. As far as port size/area it depends on how much air will be moving through the port. This will change with how much power is applied. I am a big fan of winISD, if you can list the specs you have for the drivers I will see what I can do to find the rest. Modeling the enclosure will show you how the tuning and box size will change your output. This can be directly compared to your current sealed box. I think this will go a long way to help you understand what is going on with the different enclosures. This will help you to be able to build better ones in the future.