WinISD auto calculations w/ WR125

[edjosh23]

The other day when modeling different drivers for my next project I looked back and modeled the WR125. What I didn't realize is that winISD automatically calculates the best box size and tuning frequency, I'm not sure how I didn't realize that. But winISD recomended box size for the wr125 is 26.6 litres and tuned to 42hz. I tuned my box to 50hz (I think).

Why is winISD recomending tuning frequencies so much lower than the Fs?

I was thinking about building a pair of boxes this weekend using the recomended volume and tuning frequency. Would that be a wait of time?

Thanks,

Josh

[Audist]

WinISD can calculate the optimal box, but what the type of the box system that you choose?

BB4 / QB3 / C4 ... ?

I like use with BB4 tuning, for my opinion is the best sounding.

[planet10]

Originally posted by edjosh23
What I didn't realize is that winISD automatically calculates the best box size and tuning frequency,

It might be better to say that WinISD, calculates whatever the author used for his idea of what optimal is. I'd think that this would end up as a receipe for not very optimal most of the time.

I spent quite a bit of time playing with BR for the similar FR125 and ended up with 13 litres tuned to 52 Hz (true thou that i also intend to push it toward aperiodic)

dave

[edjosh23]

I've got I think 2 other software to help with box design, but I like winISD because it very user friendly and you can easily compare different drivers and different enclosures. The boxes that the wr125s are in now are poor quality, ugly, cheap ($15 of materials, I had a bit), and will never be finished.

I like the new FR125s, they would be great instead of this hi-vi tweeter, which I like just because it is an easy addition to any speaker to see how a little top end would sound. I haven't looked a the t/s parameters for the fs125 but I thought Tim said they were very similar, and if they are very close I'd love to drop them into these enclosures.

Well here is a graph comparing your box Dave to mine, from winISD and I might try to model the boxes in diffent software. I also have to try this out in MathCAD now that it is working on my computer .

I'm going to try out these boxes and if they don't sound as good as what they are in now I'll just have to rebuild them. But what you don't think I'll be waisting my time on these boxes?

Thanks,

Josh

[edjosh23]

Dave,

I modeled both enclosures in unibox. Your enclosure is much smoother and doesn't really peak much, while mine peaks in the 40-45hz range and then levels out smooth, actually a bit smoother than yours. In yours from about 50hz -100hz the responce is +3db, similar to the plot from winISD. The unibox for my box is similar to the winISD plot, but when it peaks at 40hz it is +3db and then levels out at 50hz, in the winISD plot it peaks then decreases, which does not happen in unibox.

I think I'm going to buy some wood tomorrow and build myself some real boxes, finally. How does electric blue sound? I'm hoping the color will make it sound better

Thanks,

Josh

[Stocker]

If you have the time, supplies, money and motivation, go for the different boxes. You may be pleasantly surprised. Build just one and do a comparison with what you currently have. The +/- 1, 2, maybe 3dB differences, most people are pretty unlikely to hear, especially during actual music.

[planet10]

Originally posted by edjosh23
Your enclosure is much smoother and doesn't really peak much, while mine peaks in the 40-45hz range and then levels out smooth, actually a bit smoother than yours. In yours from about 50hz -100hz the responce is +3db,

And with my close to aperiodic ports -- inspired by the solo 103 -- i hope to convert that slight rise into a smooth fall-off and a bit slower dive as things reach cutoff. ie somewhere between the BR response & sealed response.

dave

[edjosh23]

Well I work 50 hours a week, but I'm hoping to build both boxes this weekend. Sanding and painting will end up taking a very long time, but I can handle that. I'm craving more bass.

Dave, I must say, my aperiodic boxes didn't sound the best, but they weren't bad, but I had no clue what I was doing. I'm sure you can make them work really well though.

I'll update tomorrow hopefully with pictures too.

Thanks,

Josh

[planet10]

Originally posted by edjosh23
my aperiodic boxes didn't sound the best, but they weren't bad, but I had no clue what I was doing. I'm sure you can make them work really well though.

At this point there isn't a whole lot of science behind the aperiodic box... experience, feel, cut & try are the tools... (i'm guessing the MJK model could be extended to model them, perhaps some day...)

dave

[edjosh23]

I've done a little work in MathCAD and I've figured out I need a lot of stuffing. The total length is 49.5" and the vent is 2x6 and is 15.84" long. The woofer is 6" from the top and the stuffing is going to be about a .5 lbs per foot thoughout the cabinet except in the vent. Does this sound like a good plan or should I change something?

Thanks,

Josh