Topic: Edirol R-09 Impedance? (for roll-off settings...)

[Liquid Drum]

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?

[hi and lo]

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

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

[Liquid Drum]

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

[Liquid Drum]

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...

[hi and lo]

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)

[Liquid Drum]

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. 

[guysonic]

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

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.