Roland R-09 Spezifikationen PDF herunterladen (Seite 5)

Edirol/Roland R-09 Review

file:///D|/Sonicweb%20Dreamweaver%20Edition_Recent/r-09revw.htm[4/3/2010 12:50:30 PM]

MAXIMUM GAIN

The graph at left

shows low noise

external preamplifier

model PA-3SX

lowering INPUT

NOISE by up to 24

dB over R-09's

internal mic input

preamp.

R-09's internal mic

preamp noise is the

YELLOW color.

External PA-3SX

noise is the RED

color.

MIC INPUT VERSES

EXTERNAL

PREAMP LINE

INPUT

NOTE: Some have found the above comparison confusing. All test were done with 1000 ohm dummy load at the inputs of R-09 mic jack and PA-3SX

external preamplifier.

Best I can explain, the YELLOW trace is R-09 MIC input at 'HIGH" gain mode with REC level adjust setting at #21 (#30 is maximum) compared

to best signal stage external preamplifier I know to design/build set at highest gain selection (PA-3SX external preamp is the RED trace). For the

deck's preamp set in high mode and #21 REC level, both internal and external preamplifier are applying the same gain to the MIC input with REC

adjust set at #21 when external preamp is connected.

Under these conditions, if a mic was connected to either deck's mic input (the internal mic pre), or the external PA-3SX mic pre, the VU would

read the same signal strength for identical loudness acoustic sound hitting the microphone, but the electrical input background noise (the

electronics) would be MUCH LOWER using the external preamplifier.

Obviously, the external preamplifier is going into the deck's LINE input, while the internal MIC preamp of the R-09 is

working from the MIC input on the deck. In other words, for the same applied mic input gain, the RED trace shows the

recorded background noise with custom designed external preamplifier verses the yellow trace showing the background

noise of the internal R-09 mic pre with all input conditions being equal.

Even knowing much lower input noise is possible with special external preamp, the internal mic pre noise of the R-09

deck is often adequate for general purpose recording of louder or amplified musical sounds using moderately high output

microphones.

PA-3SX external preamp shown Velcro attached to R-09

PROBLEM #1 SOLUTION #1

Attaching accessories to R-09's backside with sticky-backed Velcro™ is a Secure the back panel with 0.5"

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