Qts and qms

[hdorre]

It's old school, but i like WinISD beta. It's basic and free, which works.

Same here. Its my go-to when figuring out things like ports.

[zanekeimigdesigns]

Okay, so what if my manufacture doesnt supply me with all the t/s parameters that the program asks for?

[Quiet]

There are devices you can get that will help you get T/S params..

Dayton Audio DATS will do it. http://www.parts-express.com/dayton-audio-dats-v2-computer-based-audio-component-test-system--390-806

[Triticum Agricolam]

Okay, so what if my manufacture doesnt supply me with all the t/s parameters that the program asks for?

With WinISD at least, you don't need everything it asks for. It can auto-calculate some parameters from others. Also some parameters just aren't as important.

So what do you have for parameters so far?

[Quiet]

Okay, so what if my manufacture doesnt supply me with all the t/s parameters that the program asks for?

With WinISD at least, you don't need everything it asks for. It can auto-calculate some parameters from others. Also some parameters just aren't as important.

So what do you so far?

That's true, all you really need is Qts, Vas, and Fs to get a curve going.

[zanekeimigdesigns]

Spl, pe, bl, z, le. And do i have to convert everything over to metric to enter in to winlsd?

[Triticum Agricolam]

Spl, pe, bl, z, le. And do i have to convert everything over to metric to enter in to winlsd?

You can click on the unit designation next to a field in WinISD to change what units its in. If you don't have the newest version of WinISD, you can get it here, its much better: http://www.linearteam.org/download/winisd-07x.exe

So you don't have any QTS/QES/QMS or Vas parameters? That's going to make it tough.

WinISD is very picky about how parameters are entered into it. Here is the best way to do it:

1. Enter Mms and Cms

This gives fs. If either is not available, then enter fs and other parameter.

2. Enter Sd, Bl and Re

Now, you should get all but Qms (and Qts), Vas. Please note that Vas may not match exactly what is specified by manufacturer, because exact value of Vas depends on environmental parameters. See FAQ.

3. Enter Rms or Qms.

Either one will do, although I tend to prefer Qms over Rms, because it can usually be measured in driver measurement procedures.

4. Enter Hc, Hg and Pe.

If Hc or Hg or either is available, then enter Xmax and optionally either Hc or Hg if available.

5. Enter number of voicecoils.

This procedure is most accurate. Also note that it also calculates true SPL (1W/1m) value. So it might not match the marketing SPL value, which is generally somewhat vague. Not in all cases, though.

6. Correct Znom, if necessary.

If there are several voicecoils, then you must be careful when entering parameters in that case, because many manufacturers give Bl in voice coils in series, because it yields double value for Bl against parallel connection. If driver manufacturer gives Qes, Bl and Cms or Mms, then you can check how Bl is specified. For that, you can enter following parameters to calculate Re: Qes, Fs, Mms or Cms and Bl. Connection mode can be changed by changing the combobox selection. The driver editor then converts Bl and Re values accordingly.

Equivalently, you can check for Bl by entering:

Qes, Fs, Mms or Cms and Re (for desired connection mode).

If you enter resistance for parallel connection and get about half of advertised Bl, then you know, that Bl was specified that way.

Like in Driver-tab in project window, you'll probably noticed the driver icon in bottom of the driver editor window. you can drag the driver object into some project by just dragging the icon.

[zanekeimigdesigns]

I meant to say i dont have, Spl, pe, bl, z, le.

[Triticum Agricolam]

Oh you should be fine then.

[Quiet]

Spl, pe, bl, z, le. And do i have to convert everything over to metric to enter in to winlsd?

You can click on the unit designation next to a field in WinISD to change what units its in. If you don't have the newest version of WinISD, you can get it here, its much better: http://www.linearteam.org/download/winisd-07x.exe

So you don't have any QTS/QES/QMS or Vas parameters? That's going to make it tough.

WinISD is very picky about how parameters are entered into it. Here is the best way to do it:

1. Enter Mms and Cms

This gives fs. If either is not available, then enter fs and other parameter.

2. Enter Sd, Bl and Re

Now, you should get all but Qms (and Qts), Vas. Please note that Vas may not match exactly what is specified by manufacturer, because exact value of Vas depends on environmental parameters. See FAQ.

3. Enter Rms or Qms.

Either one will do, although I tend to prefer Qms over Rms, because it can usually be measured in driver measurement procedures.

4. Enter Hc, Hg and Pe.

If Hc or Hg or either is available, then enter Xmax and optionally either Hc or Hg if available.

5. Enter number of voicecoils.

This procedure is most accurate. Also note that it also calculates true SPL (1W/1m) value. So it might not match the marketing SPL value, which is generally somewhat vague. Not in all cases, though.

6. Correct Znom, if necessary.

If there are several voicecoils, then you must be careful when entering parameters in that case, because many manufacturers give Bl in voice coils in series, because it yields double value for Bl against parallel connection. If driver manufacturer gives Qes, Bl and Cms or Mms, then you can check how Bl is specified. For that, you can enter following parameters to calculate Re: Qes, Fs, Mms or Cms and Bl. Connection mode can be changed by changing the combobox selection. The driver editor then converts Bl and Re values accordingly.

Equivalently, you can check for Bl by entering:

Qes, Fs, Mms or Cms and Re (for desired connection mode).

If you enter resistance for parallel connection and get about half of advertised Bl, then you know, that Bl was specified that way.

Like in Driver-tab in project window, you'll probably noticed the driver icon in bottom of the driver editor window. you can drag the driver object into some project by just dragging the icon.

I meant to say i dont have, Spl, pe, bl, z, le.

Oh you should be fine then.

Holy shit LOL

I knew this was gonna get out of hand quick lol

If you click on the unit of measurement right after each field, it will change it from metric to US and vise-versa. Just enter in the parameter as you received in the unit type you received and it will convert it automatically.

Forget all the other T/S, just use what you got, it'll get you started.