Film-Tech Forum ARCHIVE: A question for D2 owner

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Posted by Antonio Marcheselli (Member # 373) on 03-20-2005, 09:01 AM:

Hi

I need to know if the ISO curve that is shown in the D2 curve for stage channels has the 10.000Hz Rolloff or not.
If I remember correctly (I saw it once) it was the classic ISO curve with the 3dB rolloff at 40Hz, then 3dB per octave at 2.000Hz and then... how many dB per octave after 10.000Hz?

Thanks a lot!!

Antonio

Posted by Gilbert Travin (Member # 2138) on 03-23-2005, 04:05 AM:

Hi Antonio !

Just a question what does "D2" mean ?
I know "Bode diagram", slope of X dB per decade, but not "D2" !
I can help you if I know the kind of filter you call "D2" ! [Big Grin]

Posted by Antonio Marcheselli (Member # 373) on 03-23-2005, 08:34 AM:

Hi Gilbert

Sorry for the confusion, the D2 is the new THX spectrum analyzer that has been made after the R2! I need to know the ISO curve that is displayed on the WinRTA software!!!

Bye
A

Posted by Gilbert Travin (Member # 2138) on 03-23-2005, 10:00 AM:

OK Antonio [Big Grin]

Sorry, I don't know this analyser and this software [Frown]

Generally with analog low-pass filters, we have slopes at -6 dB, -12 dB or -18 dB per octave (resp. -20db, -40 dB and -60 dB per decade).
With software filters "anything" is possible ! But a too much important slope generate signal amplitude oscillations and important phase rotations, it is not good .
Bye

Posted by Gordon McLeod (Member # 33) on 03-23-2005, 08:17 PM:

Since it is designed to do THX recerts it should show the same parameters as the R2 and it is the standard ISO curve

Posted by Antonio Marcheselli (Member # 373) on 03-24-2005, 04:04 PM:

Thank you Gordon

Has anyone a shoot of the screen of WinRTA?

Bye
A

Posted by Brad Miller (Member # 2) on 03-24-2005, 07:16 PM:

Only for you Antonio.

click here

Posted by Antonio Marcheselli (Member # 373) on 03-24-2005, 08:44 PM:

THANK you Brad!

Ciao

Antonio

Posted by Mark Gulbrandsen (Member # 72) on 03-25-2005, 08:12 AM:

So Brad, Did you actually purchase one?

Mark

Posted by Brad Miller (Member # 2) on 03-25-2005, 03:13 PM:

Yup, been very pleased with it. [thumbsup]