Taperssection.com

Gear / Technical Help => Battery Boxes, Preamps, Mixers, ADCs, and Processors => Topic started by: Liquid Drum on October 31, 2007, 11:51:21 AM

Title: Edirol R-09 Impedance? (for roll-off settings...)
Post by: Liquid Drum on October 31, 2007, 11:51:21 AM

Been searching a bit and can only find info for DAT, Iriver, can't find any info for edirol r-09.

Just wondering how each roll-off setting really works when going line-in using a battery box.


Thanks,
Simon.

P.S. Am I explaining it correctly?

Title: Re: Edirol R-09 Impedance? (for roll-off settings...)
Post by: hi and lo on October 31, 2007, 03:05:19 PM

http://www.edirol.net/products/en/R-09/specs.html

Input Impedance   Mic input: 20 k ohms, Line input: 17 k ohms

Title: Re: Edirol R-09 Impedance? (for roll-off settings...)
Post by: Liquid Drum on November 01, 2007, 06:18:47 AM

Quote from: hi and lo on October 31, 2007, 03:05:19 PM

http://www.edirol.net/products/en/R-09/specs.html

Input Impedance   Mic input: 20 k ohms, Line input: 17 k ohms

Thanks, can't beleive I'm stupid enough not to look at the specs first, lol.

+t

Title: Re: Edirol R-09 Impedance? (for roll-off settings...)
Post by: Liquid Drum on November 01, 2007, 10:41:27 AM

Sorry for yet another goofy question, just wondering now what the roll-off will actually be on each setting? I'm not sure how its worked out, I found a thread that said you need to divide by 5 times less to get the real setting...

Title: Re: Edirol R-09 Impedance? (for roll-off settings...)
Post by: hi and lo on November 01, 2007, 03:47:19 PM

The Magic formula is:

f=1/(2*pi*RC)

f = frequency desired (in Hz)
pi = 3.1415927......
R = Input impedence of your recorder (in Ohms)
C = Capacitor value (in Farads)

Title: Re: Edirol R-09 Impedance? (for roll-off settings...)
Post by: Liquid Drum on November 03, 2007, 01:35:24 PM

Quote from: hi and lo on November 01, 2007, 03:47:19 PM

The Magic formula is:

f=1/(2*pi*RC)

f = frequency desired (in Hz)
pi = 3.1415927......
R = Input impedence of your recorder (in Ohms)
C = Capacitor value (in Farads)

Now I'm really confused... lol  ???

Never was any good at maths.  :-\

Title: Re: Edirol R-09 Impedance? (for roll-off settings...)
Post by: guysonic on November 03, 2007, 04:07:32 PM

Quote from: Liquid Drum on November 03, 2007, 01:35:24 PM

Quote from: hi and lo on November 01, 2007, 03:47:19 PM

The Magic formula is:

f=1/(2*pi*RC)

f = frequency desired (in Hz)
pi = 3.1415927......
R = Input impedence of your recorder (in Ohms)
C = Capacitor value (in Farads)

Never was any good at maths.  :-\

Now I'm really confused... lol  ???

Very handy javascript calculation pages are available for this.  One for you to simply plug in capacitance and ohms (desired reactance= deck input ohms) is at http://ourworld.compuserve.com/homepages/Bill_Bowden/XLC.htm (http://ourworld.compuserve.com/homepages/Bill_Bowden/XLC.htm)

With R-09, if mic power is OFF, then stated specs are accurate, but if mic power is turned ON, then expect input impedance ohms to drop to ~2,000 ohms.  This can be handy if wanting more bass reduction using same capacitor value by turning on mic power in the menu.