What am I doing wrong in WinISD 0.50a7

[Catbug]

I've been trying to use this program and have watched a few tutorials and can't figure out why it's telling me the parameters are wrong. I checked that the Units are correct and used tab to let the program auto correct. I included below screen shots. Any help would be really great. Thank you.

Sub is a Hertz 300-d 1200 W. 4 ohm + 4 ohm. I included the technical sheet below.

Parameters

Advanced Parameters

Dimensions

Error

Click to read more...

 

[Kangaroux 5,000+ posts]

I've been trying to use this program and have watched a few tutorials and can't figure out why it's telling me the parameters are wrong. I checked that the Units are correct and used tab to let the program auto correct. I included below screen shots. Any help would be really great. Thank you.

Some T/S params can be derived by using already known params. Basically, WinISD will auto fill params as you give it information. However, if you overwrite one of the params it derived, it gets confused because the ratios should match up, but they don't.

Basically, as you're typing in the T/S into winISD and you notice some of the boxes get auto filled with blue numbers, just leave those blue ones alone. That's WinISD deriving the values internally. If you change them, it gives you an error about inconsistencies.

 

[trumpet 5,000+ posts]

Start with Qes, Qms, Fs and Vas. You don't need anything else to generate a transfer function magnitude graph. Let us know if that works.

 

[Catbug]

OK so far what you guys said worked! But I'm now having trouble making the single square port work. I get a ridiculas port length. I'll keep looking into to. Thanks for your help guys I was getting so pissed. I was not letting the program do what it wanted. I would tab then delete what it came up with and write what was on the sheet.

Sent from my XT1028 using Tapatalk

 

[wew lad 5,000+ posts]

you're going to need to take some time modifying port length and area until you get close to what you want, it automatically determines port length when you set the tuning.

definitely dont replace any numbers the program calculates automatically - the program is weird about that. it does it because there's different derivations of formulas that give the same result as long as you enter the minimum variables for it to calculate.

 

[trumpet 5,000+ posts]

Page 2 of the spec sheet has your enclosure dimensions for two bass reflex(ported) designs.

 

[Catbug]

Ok so I should get some kind of cure on my page at least when I set my airspace and desired tuning right? I thought I would get something that looks a little more normal and then you would fine tune it and get it to where you want it to be. Accept I get this lol. I'm assuming WinISD is saying ok stupid if that is what you want then here. Here is a stupid graph for your stupid self.

 

[wew lad 5,000+ posts]

check your units - volume specifically.

 

[trumpet 5,000+ posts]

I use WinISD 0.50a7. I entered Qes, Qms, Fs, Vas, Mms, BL, then saved the driver. I created a new project, 1 driver, vented, super boom box alignment. Done.

 

[Catbug]

maybe because i'm not using the super boom box? What is the difference if the box is tuned to what you want it to be? The other difference is i'm using two drivers.

 

[Catbug]

@trumpet ok did what you suggested and got a much better graph. Thank you. Mitchell0715 I adjusted my volume as well and that made a big difference. Thanks guys! First sub box I have ever built. So much to learn.

 

[trumpet 5,000+ posts]

maybe because i'm not using the super boom box? What is the difference if the box is tuned to what you want it to be? The other difference is i'm using two drivers.

WinISD defaulted to Chebyshev for the alignment. I never use that. If you want it tuned higher, and I would try that for comparison as tuning at 31 Hz is rather low, go to the tab that shows box volume and tuning frequency. Click the tuning frequency and hit the up or down arrow on the keyboard to change it and watch how the graph changes. With the enclosure in a vehicle the cabin gain will do a lot to boost the low end, so while the graph might develop a peak it doesn't necessarily mean there will be a lack of deep bass.

 

[Catbug]

OK I'll give it a shot. I think what's messing me up is the data sheet doesn't actually give me a solid volume or airspace after displacement. I brought the spec sheet to an audio install store and they said I didn't have enough info even though it's everything that hertz supplies with the sub.I'm pretty sure I left the store more confused then before I went in. But I will not pay 500 for a box...