WinISD

[SpeakerBoy 64]

I just downloaded WinISD and am trying to figure out what length i need for my port, but my driver is not listed, and i don't know the t/s parameters

Driver is a bose 201 6.5" its fairly old, early or mid 90's. External dimensions are 6"x9.5"x12" using 1/2" mdf. port will be 2" pvc pipe, and the port will be external.

[///M5 2,833]

port length and driver are independent

The T/S parameters will affect the box size, not the port

[SpeakerBoy 64]

port length and driver are independent

The T/S parameters will affect the box size, not the port

I though t/s affected the overall. What i am specifically looking for is the length of the port i need for a given tuning, i already have the peices cut to make the box, so dimensions are set.

[///M5 2,833]

Then choose that box size and port area and you will be fine.

The T/S do have an effect on the overall enclosure, but that is of course because if you change the size of the box everything else changes.

[KU40 173]

Right. Driver does not affect port dimensions. The only things that affect port length are net box volume, port area, and tuning frequency. Notice here what the inputs are: http://mobile.jlaudio.com/support_pages.php?page_id=165

Whenever I'm using winISD and just want a port length I just choose the default driver, which I think is A/D/S something or other, for quickness's sake. Doesn't matter what driver you use.

[SpeakerBoy 64]

Right. Driver does not affect port dimensions. The only things that affect port length are net box volume, port area, and tuning frequency. Notice here what the inputs are: http://mobile.jlaudi...php?page_id=165

Whenever I'm using winISD and just want a port length I just choose the default driver, which I think is A/D/S something or other, for quickness's sake. Doesn't matter what driver you use.

Well i got most of it sorted out, but my port length is coming out to be really long; i think it was fifty something inches and when i change a few things, it jumps between that, and a few hundred inches. I am using 2"pvc, and i have 2ft of it, but i can use maybe 4" to the elbow and 6" sideways for a total of 10". i might be able to pull off a little more with another elbow.

Why doesnt Polyfill work in a vented box? I've seen it done, but never questioned it.

Edited December 3, 2009 by DeepSubBoy

[///M5 2,833]

Welcome to the world of small boxes, they always equal long ports.

As for the Polyfill in a vented box, it isn't that it doesn't work it just adds more variables that aren't helpful. A better question is why do you want to add it?

*note I am not referring to lining the walls of the enclosure, but stuffing

[SpeakerBoy 64]

Welcome to the world of small boxes, they always equal long ports.

As for the Polyfill in a vented box, it isn't that it doesn't work it just adds more variables that aren't helpful. A better question is why do you want to add it?

*note I am not referring to lining the walls of the enclosure, but stuffing

I am just trying to get the best lowend i can out of a 6.5". No world records, but something that is decent. I was noobish when i built the first two, and destroyed them by clipping and beating on them. I want a clean sound, down to at least 35hz. I have 12v/160ca/12ah of power to work with and i might even double that. I need to take my battery to autozone, for them to put the acid in it (i have never done it before). I am going to pick up a jigsaw blade soon, to cut the baffle, and port hole. Then i can screw, clamp and glue. if i have ~.35cuft with 12 inches of 2" port what should that come out to?

If i lined the box with polyfill, as opposed to stuffing, would it benefit me to do so?

[jcarter1885 995]

Basically what he is saying that there will be no 6.5" speaker that should be in a box tuned that low. Either rethink drivers or rethink your goals.

[///M5 2,833]

.35cuft and ported is going to be a RIDICULOUSLY long port, even for 40Hz. Nothing you can do will get tons of output down that low out of such small surface area. And no I wouldn't worry about lining as you aren't going to meet your goals anyways.

Pretty sure you aren't realistic on what 35hz actually is...