Audio Research GSi75 User Manual
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Audio Research GSi75 User Manual

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H I G H
D E F I N I T I O N
®
GSi75
Stereo Integrated Amplifier

User Guide

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Summary of Contents for Audio Research GSi75

  • Page 1: User Guide

    H I G H D E F I N I T I O N ® GSi75 Stereo Integrated Amplifier User Guide...
  • Page 2 H I G H D E F I N I T I O N ®...
  • Page 3 Thank you for choosing the GSi75 to be a part of your high performance music listening system. Since 1970, Audio Research has been creating some of the world’s finest audio equipment. Each piece is handcrafted in Minnesota, and has been designed to provide many years of listening enjoyment.

  • Page 4: Table Of Contents

    Contents Warnings Installation Before Operating the GSi75 To Remove the Top Cover In Your System Connections Back Panel Controls and Connections Operation Input Connectors Front Panel Controls and Displays Output Connectors Start-Up IR Input Shut-Down 12 volt Trigger Break-in RS-232 Control...

  • Page 5: Warnings

    Audio Research dealer or other qualified personnel. This unit is RoHS compliant. A note about packaging... The detachable power cord on your GSi75 is equipped with a heavy gauge, 3-conductor cable and a standard Save all packaging in a dry place away from fire hazard.

  • Page 6: Installation

    GSi75 in their proper locations in the chassis. Note that the numbers written on each tube correspond to a ‘V’ number etched on the chassis next to each Note tube socket.

  • Page 7: In Your System

    The special non-marring elastomer feet provide Do not stack components or other objects directly on top adequate spacing and stability only on a smooth, of the GSi75. hard surface, and also assist to isolate the amplifier from spurious vibrations. For upright stability and best performance, never operate the unit while it is sitting on a soft surface such as a thick rug or carpet.

  • Page 8: Connections

    Connections Back Panel Connections Speaker Speaker Terminals Terminals (right channel) (left channel) A.C. Mains Connector Input Fuse Phono and Digital Analog Inputs Inputs RS-232 Connector...

  • Page 9: Input Connectors

    IR Input this case, SE3 should only be connected to a component The IR input can be used to link the GSi75 to an IR repeater with a volume control (such as a home theater system with a standard mono 1/8” connector.

  • Page 10: A.c. Power Connection

    Connections A.C. Power Connection The GSi75 uses a grounding system that does not require It is important that the GSi75 be connected via its a ground-lifter adapter plug on the A.C. power cord to supplied 20 amp IEC 12-gauge power cord to a minimize hum.
  • Page 11 H I G H D E F I N I T I O N ®...
  • Page 12 Operation Front Panel Controls and Displays Input Volume Select Control Power Function On/Off Buttons side panel Headphone Output Menu Button DAC and Bias Function Indicators Indicators...
  • Page 13 Operation Start-Up Shut-Down • Secure all rear-panel connections between GSi75, input • Activate ‘MUTE’ function. sources, and speakers. • Press Power switch to ‘off’. • Plug three-prong power cord from rear of chassis • Turn off input sources. into grounded A.C. wall outlet. The Power switch defaults to ’off’...
  • Page 14 Operation Front Panel Controls Menu The GSi75 has two microprocessor-driven rotary controls The menu button enters the setup menu of the GSi75 to and five buttons (Power, Menu, Mono, Speaker Off, and allow customizing certain settings of the integrated Mute).
  • Page 15 ‘Phono’ input; this following additional features of the GSi75. feature only operates when the ‘Phono’ input is selected. To match the impedance of the GSi75 with your Display Brightness Adjustment cartridge, refer to the specifications included The front panel display has six brightness settings, as with your phono cartridge.
  • Page 16 The Balance control adjusts the output from center Sample position to the left or right channels, which in The sample button will switch the DAC in the GSi75 turn will shift the center point of the sonic image. between native rate sampling (whatever the bit rate...
  • Page 17 Operation Settings Menu While a menu item is displayed, rotating the volume The GSi75 has been designed with a simple, intuitive knob on the front panel, or using the volume up/down menu to allow you adjustment of several features of buttons on the remote, will adjust the settings of that the amplifier.
  • Page 18 Operation Settings Menu continued... Processor On/Off The SE3 input of the GSi75 can be selected as a standard, Auto Shutdown volume-controlled input like the other inputs, or it The GSi75 is equipped with an auto shut-off feature, can be set as a ‘unity gain’ processor input. This is...
  • Page 19 ‘CONFIRM?’: Tube Hours The tube hours display shows the accumulated time the GSi75 has been powered on. This is useful Then press ‘MUTE’ a second time to reset the counter. for determining the number of usage hours of the installed vacuum tubes.
  • Page 20 To use the headphone output, locate the ¼” headphone feature in the event you are concerned about accidental jack on the right side of the GSi75 (when looking at excessive volumes from a previous listening session. the front panel). Connect headphones, and on the...
  • Page 21 Class AB1, and will satisfy the most critical listener. each tube; this is normal. Though the output tubes For best results, operate and adjust the GSi75 at the of your amplifier are carefully matched before voltage specified for your unit. Adjustment must be...
  • Page 22 Gain the remote control. The current setting is displayed. The GSi75 offers two levels of gain; which one is best for you will depend on the output voltage of your cartridge. For the high gain setting, usually the best sound performance occurs when the high gain setting is used for cartridges below 1 mV.
  • Page 23 GSi75. Use the input knob on the front panel, or the upsampling process. Signals of 44.1 kHz and its direct input buttons on the remote, to select the multiples will upsample to 352.8 kHz, and signals of...
  • Page 24 Operation Windows Software Installation Double-click or ‘run’ the program. The next window will To utilize the USB connection on the GSi75, the connected begin the installation process: computer must have driver software installed. Note: if you are using an Apple computer running Mac OS, you do not need to install any software.
  • Page 25 Operation The GSi75 will proceed through the install process, If you do not connect the GSi75, the installer will prompt and the dialog box on the screen will keep you you again to connect the unit to complete installation. updated on the progress. Once installation is...
  • Page 26 GSi75 is connected and operating properly. Please note that in order for the computer to see the GSi75, the unit must be powered on. Open up the Control Panel on your computer, and click on ‘Device Manager’ to expand: ‘DAC USB Device’...
  • Page 27 Operation To set the USB DAC as the default player for Windows Media Player, open up Control Panel and click on ‘Sound’. Select ‘DAC Out 1/2’ and choose ‘Set Default’: Note Windows Media Player will only support sampling frequencies up to 192 kHz and 24 bit. Windows To change the sampling rate (if using Windows Media and iTunes will not automatically switch Media Player or another non-ASIO media...
  • Page 28 Operation Configuring JRiver Media Center for Windows If you plan to play back native DSD files, select Follow these instructions for a simple configuration ‘DSD’ under ‘Bitstreaming’. If you will not of JRiver Media Center for Windows. be playing any DSD files, select ‘None’: Once you have installed JRiver Media Center on your computer, open ‘Player’...
  • Page 29 Configuring the DAC for Mac OS Configuring JRiver Media Center for Mac Connect the GSi75 to the USB port of your Mac. Power on Follow these instructions for a simple configuration the GSi75. In ‘System Preferences’, click to open ‘Sound’: of JRiver Media Center for Mac.
  • Page 30 Configuring JRiver Media Center for Mac continued Configuring Signalyst HQPlayer for Mac Signalyst HQPlayer will support native DSD playback without PCM conversion on a Mac. Once you have installed HQPlayer on your computer, open ‘Preferences’ and select the USB DAC as the output device: In the options window, please select ‘DSP &...
  • Page 31 Set ‘Channels’ to 2, ‘Channel Offset’ to 0, Before beginning playback of PCM content, select ‘PCM’. ‘SDM Pack’ to DoP, tick the ‘2wire’ option, If a DSD file is played when PCM is selected, HQPlayer and select ‘DAC Bits’ to default: will convert the DSD output to PCM in its software.

  • Page 32: Maintenance

    Department of Audio Research Corporation at service@audioresearch.com or call 763-577-9700. To dispose of this electronic product, do not place To initiate a service request, visit the Audio Research in landfill. In accordance with the European Union website (www.audioresearch.com) and select ‘Service Waste Electrical and Electronic Equipment (WEEE) Repair’...

  • Page 33: Warranty

    Warranty Audio Research Corporation products are covered by a The specific terms and remedies for fulfillment of 3-Year Limited Warranty or a 90-Day Limited Warranty the Limited Warranty may vary from country to (vacuum tubes). This Limited Warranty initiates from country.

  • Page 34: Specifications

    Specifications Power Output: 75 watts per channel continuous from 20Hz to 20kHz. 1 kHz total harmonic distortion typically 1.5% at 75 watts; 0.1% at 1 watt. (PEAK). Approx- imate actual power available at “clipping” 63 watts RMS (1kHz). (Note that Digital Signal Inputs: SPDIF: TOS, RCA(BNC);...
  • Page 35 Specifications AMPLIFIER OUTPUT STAGE Tubes Required: 2-Matched pair KT150-Power Output; 2 -6H30 driver. Output Polarity: Non-Inverting (any input). Dimensions: Width 19.0” (48.3 cm) Height 10.37” (26.3 cm) Output Taps: 8 ohms, 4 Ohms. Depth 20.41” (51.8 cm) Output Regulation: Approximately 2dB; (from 8 Ohm load to open circuit Weight: 55 lbs (25.0 kg) Net.;...
  • Page 36 D E F I N I T I O N ® 3900 Annapolis Lane North Plymouth, MN 55447 www.audioresearch.com Specifications subject to change without notice. ©2015 Audio Research Corporation. Reproduction of this document in part or whole is expressly forbidden without written consent from Audio Research Corporation.

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