Rolls GCi404 User manual

GCi404
Audio Computer Interface
OWNERS MANUAL
ROLLS CORPORATION
SALT LAKE CITY, UTAH
4/02
LIMITED WARRANTY
This product is warranted to the original consumer purchaser to be free
from defects in materials and workmanship under normal installation, use and
service for a period of one (1) year from the date of purchase as shown on the
purchaser’s receipt.
The obligation of Rolls Corporation under this warranty shall be limited
to repair or replacement (at our option), during the warranty period of any part
which proves defective in material or workmanship under normal installation,
use and service, provided the product is returned to Rolls Corporation, TRANS-
PORTATION CHARGES PREPAID. Products returned to us or to an authorized
Service Center must be accompanied by a copy of the purchase receipt. In the
absence of such purchase receipt, the warranty period shall be one (1) year from
the date of manufacture.
This warranty shall be invalid if the product is damaged as a result of
defacement, misuse, abuse, neglect, accident, destruction or alteration of the
serial number, improper electrical voltages or currents, repair, alteration or
maintenance by any person or party other than our own service facility or an
authorized Service Center, or any use violative of instructions furnished by us.
This one-year warranty is in lieu of all expressed warranties, obligations
or liabilities. ANY IMPLIED WARRANTIES, OBLIGATIONS, OR LIABILI-
TIES, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE,
SHALL BE LIMITED IN DURATION TO THE ONE YEAR DURATION OF
THIS WRITTEN LIMITED WARRANTY. Some states do not allow limitations
on how long an implied warranty lasts, so the above limitation may not apply to
you. IN NO EVENT SHALL WE BE LIABLE FOR ANY SPECIAL, INCI-
DENTAL OR CONSEQUENTIAL DAMAGES FOR BREACH OF THIS OR
ANY OTHER WARRANTY, EXPRESSED OR IMPLIED, WHATSOEVER.
Some states do not allow the exclusion or limitation of special, incidental or
consequential damages so the above limitation or exclusion may not apply to
you. This warranty gives you specific legal rights, and you may also have other
rights which vary from state to state.
INPUT LEVEL LEVEL
INPUT INPUT
LEVEL INPUT
PHAN PWR DUCKING
BAL
STEREO
INPUT
GCi 404 Audio - Computer
Interface
pwr
L R
ground
on off on off
MICROPHONE
INSTRUMENT
LINEPHONO
DUCKING
DEPTH REL
POWER 12 VDC
R gnd L
CD
INPUT
R gnd L
LINE
OUTPUT
LINE
OUTPUT
STEREO
OUTPUT
+12 +5

INTRODUCTION
Thank you for your purchase of the GCi404 Audio Computer Interface.The GCi404
mixes a balanced XLR Microphone signal with a 1/4”Instrument signal and a group
of stereo Line Input signals to connect to any standard computer sound-card.
A ducking feature has been included in the GCi404 which, when engaged and a
signal is present at the microphone, will duck the remaining input signals under the
micsignal.
Usesforthe GCi404include commercialaudio production, produce yourown“com-
mercial” on your computer, phonograph record to computer recording, etc.
FEATURES:
• Microphone input with 12 volt phantom power
• Instrument input
• RCA Line Input, Stereo 1/8" Line Input, RCA Phono Input with Ground post and
RIAA equalization and Rumble Filter
• Individual Level controls for Mic, Instrument and Line Inputs
• Switchable automatic "Ducking" or talkover feature for Mic Input
• Stereo RCA, 1/8"TRS stereo, or 4-pin header connector Outputs
INSPECTION
1.Unpack and inspect the GCi404 box and package.
Your GCi404 was carefully packed at the factory in a protective carton.Nonethe-
less, be sure to examine the unit and the carton for any signs of damage that may
have occurred during shipping.If obvious physical damage is noticed, contact the
carrier immediately to make a damage claim.We suggest saving the shipping
carton and packing materials for safely transporting the unit in the future.
2.Please complete the Warranty Registration Card and return it to the factory.
TABLE OF CONTENTS
Introduction 1
Features 1
Inspection 1
Table of Contents 1
Description 2
Front Panel
Rear Panel
Connection 3
Operation 4
ComputerMounting
Signal Level Adjust.
Ducking
Specifications 5
Schematic 6
Warranty Back cover
SCHEMATIC
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L I N E O U T S

DESCRIPTION
FRONT PANEL
MICROPHONE
INPUT: Balanced XLR
jack for connection to low imped-
ance dynamic or condenser
microphone.
LEVEL: Adjusts the amount of signal in the microphone preamp.
PHANTOM PWR: Header connector - connects the 12VDC phantom
power for the XLR Microphone Input.
BAL: Varies the relative amount of microphone signal sent to the Right
and Left Outputs.
INSTRUMENT
LEVEL: Adjusts the amount of signal in the instrument circuitry.
INPUT: 1/4”unbalanced jack for connection to instruments such as
guitars, keyboards, etc.
PHONO/LINE
LEVEL: Adjusts the level of all deviced connected to the Phono or Line
Inputs.
INPUT (Phono):Two RCA jacks for connection specifically to the output of
a phono turntable.
INPUT (Line):Two RCA jacks for connection to line or consumer product
outputs such as a CD or cassette player.
STEREO INPUT: 1/8”(3.5mm) TRS stereo jack for connection to a stereo line
source such as a portable CD player or MP3 player.
GROUND: For connection to the grounding cable of a phono tuner.
DUCKING: Header connector - connects the Ducking function.
PWR: Indicates the GCi404 is properly connected to a power source.
REAR PANEL
POWER:12VDC, 150mA.2.1 x
5.5mm barrel jack and header port -
for connection to the Rolls PS27 AC
adapter, or to the computer’s 3 1/2
inch floppy drive power cable.
DUCKING
DEPTH: Adjusts the amount of LINE signal allowed to pass to the Outputs
when ducking is occuring.
RELEASE:The amount of time taken for the ducked LINE signal to return
to its normal level after the sigal at the Mic Input stops.
CD INPUT Port: 4-pin header for connecting to a CD rom output port. A CD Rom audio
cable is required.
LINE OUTPUTS:
STEREO OUTPUT: (1/8”(3.5mm) jack)
LINE OUTPUT (RCA):
LINE OUTPUT (Header Port):
Each of these outputs contain the Right and Left output signals.
SPECIFICATIONS
MIC INPUT
InputImpedance: 10K 9bal, unbal.
Max Input Level: +4 dBV XLR bal, +10 dBV unbal.
Max Gain: 60 dB/XLR, 54 dB 1/4"
EIN: -108 dB max.
THD: <.01%
PhantomPower: +12Volts, 6 mA
INSTRUMENT INPUT
InputImpedance: 50k 9
Max Gain: 30dB
LINE INPUTS
InputConnectors: RCA, 1/8"TRS Stereo
Input Sensitivity: 30 dB gain @ 1kHz, 47k 9Input Z
InputImpedance: 50k 9
PHONO PREAMP
InputImpedance: 50k 9
Equalization: RIAA, +/- 2dB
Ref.Gain: +20 dB @ 1 kHz
LINE OUTPUTS
OutputImpedance: 100 9
Max Output Level: +12 dB
Frequency Response: + / - 1.5dB 15 Hz - 30 kHz
THD: .02% @ 1KHz
S/N Ratio: >80 dB unweighted
OutputConnectors: RCA, 1/8"TRS - Stereo, 4-pin hdr.
Dimensions: 1.7"H x 5.9" W x 3.7" D
Weight: 1 lb.
Power: 12VDC (Rolls PS27 Incl.)
2
5
INPUT LEVEL LEVEL
INPUT INPUT
LEVEL INPUT
PHAN PWR DUCKING
BAL
STEREO
INPUT
GCi 404
Audio - Computer
Interface
pwr
L R
ground
on off on off
MICROPHONE
INSTRUMENT
LINEPHONO
DUCKING
DEPTH REL
POWER 12VDC
R gnd L
CD
INPUT
R gnd L
LINE
OUTPUT
LINE
OUTPUT
STEREO
OUTPUT
+12 +5

4
CONNECTION
Shown here is an example of
possible input connections to the
GCi404.
•If the microphone connected to the
Mic Input is a condenser micro-
phone, move the Phantom Power
jumper to the ON position.
•The guitar signal may also be
connected to a guitar preamp or
processor before being connected
to the GCi404.
•Turntables must use all three
connections; the Right, Left, AND
the Ground terminals are required
for proper operation.
•Standard CD players may be
connected to the RCA LINE INPUT
in the same manner as the Portable
CD Player.
INPUT LEVEL LEVEL
INPUT INPUT
LEVEL INPUT
PHAN PWR DUCKING
BAL
STEREO
INPUT
GCi 404
Audio - Computer
Interface
pwr
L R
ground
on off on off
MICROPHONE
INSTRUMENT
LINEPHONO
3
Shown here is an example of possible output connections from the GCi404 to
your computer.
•The unit is
powered via the
included Rolls
PS27, or con-
nected to a 3-1/2”
floppy drive
power cable.
•The CD Input
connects via a 4-
pin connector to
your CD Rom
drive.
•The Stereo
Output connects
directly to your
sound-card Input via a stereoTip-Ring-Sleeve 1/8”(3.5mm) cable.
•The Line Output port uses a 4-pin header cable to connect to your sound-card
Input header connector (if available).
DUCKING
DEPTH REL
POWER 12VDC
R gnd L
CD
INPUT
R gnd L
LINE
OUTPUT
LINE
OUTPUT
STEREO
OUTPUT
+12 +5
ROLLS
PS27 Connect to
sound card 1/8"
(3.5mm)
input.
Connect to 3-1/2 inch
drive power supply cable Connect to CD Rom
Connect to sound card
INPUT LEVEL LEVEL
INPUT INPUT
LEVEL INPUT
PHAN PWR DUCKING
BAL
STEREO
INPUT
GCi 404 Audio - Computer
Interface
pwr
L R
ground
on off on off
MICROPHONE
INSTRUMENT
LINEPHONO
CD ROM Drive
3.5 Inch Floppy Drive
POWER
RESET
OPERATION
MOUNTING
Make sure the computer is off, and the AC power cord is unplugged.
Select the drive bay you wish to mount the GCi404 into.
Remember that you will have cords hanging down from
the unit, so below a CD Rom drive is recommended.
Remove the drive bay cover and gain access to the inside
of your computer.
Place the GCi404 into the open drive bay and secure it to
the computer’s internal mounting brackets using the
enclosed mounting
screws.
Connect all Power and
Output cables. Plug the
computer back into an
AC outlet, and start it
up.
LEVEL ADJUSTEMENT
Connect the microphone, instrument, and line/phono
sources. If the microphone being used is a condenser
type, move the Phantom Power jumper to the ON position.
Bring up the software you will be using for recording. Set
the LINE LEVEL control to approximately 12 O’Clock.
Send a signal from the line sources (CD players, turntables, cassette players etc.) first
and adjust the Recording Control levels for a maximum input signal without clipping.You
may need to refer to your operating system Help menues or owners manual for assistance
in adjusting input recording levels.
Once you have a desired signal level, send signals from your instrument and microphone
and adjust the Levels on the GCi404 front panel for appropriate levels.
DUCKING
NOTE:Adjustements for the Ducking function are made on the rear panel of the GCi404.
You will need access to the inside of the computer if it is mounted in a drive bay.
To automatically mute all signals under your microphone, move the DUCKING jumper to
the ON position.
Send program material such as music to the Line Inputs.Speak normally into the micro-
phone and adjust the DEPTH control until the desired amount of Line signal is heard
under your voice. If you want the Line signal muted completely, set the DEPTH control
fully clockwise. Set the RELEASE control for the desired amount of time taken to return
the level of Line signal back to normal after you stop speaking.When the RELEASE
control is set fully counterclockwise, the time is at its longest.As the RELEASE control is
adjusted clockwise, the release time gets shorter (faster).