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Old 28th September 2012, 06:04 AM   #31
schmeet is offline schmeet  United Kingdom
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Quote:
Originally Posted by mrkennyk View Post
I just downloaded the latest version and I can not enter Qts, Vas, etc. They are grayed out. What went wrong?
At the minute , you enter the other parameters and these are then calculated. I think I will try and change this so you can enter the more 'conventional' parameters and the others are calculated. Haven't decided quite how it will work yet though..
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Old 28th September 2012, 06:05 AM   #32
NEO Dan is offline NEO Dan  United States
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Quote:
Originally Posted by schmeet View Post
Pete,

In the Amplifier window, you set the input power (in watts). It then uses the Re of the driver to calculate the input voltage sqrt(Re x Power).
Oh, now that will throw you out of whack with most other models out there. I recommend input boxes for Voltage, Nominal Impedance, & Power, enter any two.
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Old 28th September 2012, 06:06 AM   #33
PB2 is offline PB2  United States
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Quote:
Originally Posted by schmeet View Post
Pete,

In the Amplifier window, you set the input power (in watts). It then uses the Re of the driver to calculate the input voltage sqrt(Re x Power).
I see, it would be very helpful to have the computed RMS input voltage displayed somewhere or both as I said earlier. Most plot for 2.83 Vrms in, just to show the
standard voltage sensitivity, but power is fine also.
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Old 28th September 2012, 07:51 AM   #34
schmeet is offline schmeet  United Kingdom
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Thanks for the suggestions guys.

Version 2.3 has just been uploaded (as before you can update from the about window).
I have added units to the enclosure window, as well as the calculated internal volume.
I have also adjusted the driver t/s inputs so you enter the more conventional inputs. i will try and do an option to change between which set of parameters you enter.

I will also give you the option of voltage or power when I get round to it. Do you think it is worth giving another option for impedance, even though this is specified in the T/S parameters?

Got to do some real work now, I'll check back in a bit!

Pete
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Old 28th September 2012, 08:56 AM   #35
NEO Dan is offline NEO Dan  United States
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Conventionally speaking power is calculated based on the nominal impedance of the system as opposed to Re of the voice coil.

Thanks for your hard work Pete!
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Old 28th September 2012, 09:49 AM   #36
schmeet is offline schmeet  United Kingdom
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Yeah, that does make sense. i guess Znom should be a T/S parameter to enter at the driver input screen
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Old 28th September 2012, 11:35 AM   #37
schmeet is offline schmeet  United Kingdom
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Version 2.4 just uploaded.

Added Znom as a driver parameter.
Amplifier window has changed to allow entry of either Voltage or Power (using Znom).
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Old 28th September 2012, 12:16 PM   #38
PB2 is offline PB2  United States
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Actually, Pete if I am remembering correctly T&S did use Re for calculating input Pe when displaying power limited output. It is just a rough worst case approximation, but I think it is better than using Znom which can be anything. Znom is not a T&S parameter, don't think I've seen it on a data sheet but if it is there it is a marketing parameter.
T&S Papers online:
http://www.readresearch.co.uk/articles.php

Last edited by PB2; 28th September 2012 at 12:24 PM.
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Old 28th September 2012, 12:46 PM   #39
schmeet is offline schmeet  United Kingdom
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Hmm.

Yeah I got my formulas from their papers, which is why i used Re in the first place. Isn't Znom more of an average resistance as the resistance changes with frequency?

Looking at MJKs stuff, he uses Re too. Maybe i should go back to that...
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Old 28th September 2012, 01:24 PM   #40
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by schmeet View Post
Hmm.

Yeah I got my formulas from their papers, which is why i used Re in the first place. Isn't Znom more of an average resistance as the resistance changes with frequency?

Looking at MJKs stuff, he uses Re too. Maybe i should go back to that...
Suggestion. Copy this approach:

Hornresp

b
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