Related Manuals for Bandwidth Audio Aurora One
Summary of Contents for Bandwidth Audio Aurora One
- Page 1 Aurora One – Line Preamplifier & Buffer Owner’s Manual www.bandwidthaudio.com sales@bandwidthaudio.com...
- Page 2 CONTAINS LETHAL VOLTAGES High voltage can be lethal. Do not remove cover while preamplifier is connected to the Mains power source. For service, contact Bandwidth Audio. HIGH VACUUM TUBE TEMPERATURES Vacuum tubes can get extremely hot with bulb temperatures capable of reaching 200ºC. Do not touch or attempt to remove the tubes while they are hot.
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Page 3: Table Of Contents
Aurora One Connections and Setup ..................... 4 Preamplifier Placement ............................. 4 Mains AC Grounding ............................4 Powering ON & OFF ............................5 Input Connections ............................... 5 Output Connections ............................5 Gain Selection ............................6 Manual Controlled Gain ........................... 7 Pre-Programmed Gain ............................ 10 2.1.1. -
Page 4: Aurora One Connections And Setup
1.0 Aurora One Connections and Setup From the factory, the Aurora One is configured in High Gain Mode for all inputs, unless the front gain and bypass toggle switches are used. To learn about selecting and programming the gain modes, see section 2.0 •... -
Page 5: Powering On & Off
This removes the chance of any pop and noise during power on and off. The Aurora One can be turned on and off without any need for power sequencing with other equipment. The “Active” indicator on the front panel shows the status of the power-on sequence. -
Page 6: Gain Selection
2.0 Gain Selection The Aurora One is designed with 3 gain level modes to improve volume level matching between audio source. This reduces the need for constant volume control adjustments when changing the input source. The 3 Gain levels are: Bypass: 0dB •... -
Page 7: Manual Controlled Gain
Manual Controlled Gain The Aurora One’s preamp gain can be manually selected using the “Gain” and “Bypass” toggle switches located on the front of the unit. The “Gain” and “Bypass” switches each have 3 positions. Gain Toggle Switch: Down: Low Gain Mode (forced) - Page 8 * Bypass On takes priority, all gain selections are ignored Bypass On: When Bypass mode is ON, the LED next to the bypass switch will illuminate and the Aurora One will enter Bypass mode with 0dB of gain. Simultaneously, the High or Low Gain LED (whichever was selected) will turn off. This is to remind The Aurora One the user that Bypass mode takes priority over the gain setting when Bypass is on.
- Page 9 High Gain: When the Gain mode is set to “High Gain”, the “High Gain” LED will illuminate and the Aurora One will have a gain of 14dB. This is only true if the Bypass toggle is forced Off or if the Bypass in the pre-programmed setup is also off (bypass has priority).
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Page 10: Pre-Programmed Gain
Pre-Programmed Gain The Aurora One’s preamp gain can be pre-programmed for each audio input (1 through 6) using the DIP switches located on the back of the unit. The gain setting is then automatically recalled when the desired input is selected using the “Input” knob on the front. -
Page 11: Setting The Dip Switches
(1 through 6). The left-most switch controls input 1. The right- most switch controls input 6. Input 1 Input 6 Figure 2: DIP Switches for Pre-Programmed Gain Control There are 2 banks of switches: Bypass: On and Off Gain: Low and High Aurora One Rev 1.0... - Page 12 Bypass mode has 0dB of gain. The gain selection is therefore irrelevant. For example, if input 2 is set to Bypass “On” and input 2 is also set to “Low Gain”, the Aurora One will automatically go into Bypass mode regardless of the gain setting whenever input 2 is selected, Bypass switches set “Off”:...
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Page 13: Gain Setting Examples
2.2.2 Gain Setting Examples The examples below show various pre-programmed gain settings for the Aurora One. Bypass Final Gain Setting Based on Switch Positions Input Mode Low Gain Bypass Gain Bypass Low Gain High Gain Bypass High Figure 3: Pre-Programmed Gain Example... -
Page 14: Controls And Layout
LED is off, indicating the unit is held in an automatic mute. Approximately 25 seconds after power-on, the LED will illuminate indicating the preamplifier is active and ready to use. 3. Volume Controls the overall volume of outputs 1 & 2 simultaneously. Aurora One Rev 1.0... - Page 15 Used to mute the Output 2 of the preamp. The switch is active in the up position. LED indication will show when mute is active. 9. Power Used to turn the amplifier on and off. On is in the up position, Off in the down position Aurora One Rev 1.0...
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Page 16: Back Features
5x20mm glass cartridge. The Maines Fuse in series with the mains input to protect the user and amplifier from a short circuit failure. 3. Bypass Switches Pre-programs Bypass Mode “ON” or “OFF” for each input (1 through 6). Aurora One Rev 1.0... - Page 17 Bypass is set “OFF” for the input of interest. 5. Inputs 6 Left/Right pairs of RCA inputs. 6. Output 2 Left/Right pairs of RCA Outputs. Outputs are individually buffered with separate mute controls for outputs 1 and 2. Aurora One Rev 1.0...
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Page 18: Typical Specifications
Less than 10Hz and above 175KHz Input Referred Nosie (A-weighted) 1.9uV / -112.2dBu (High Gain) 3.5uV / -106.9dBu (Low Gain) 8.1uV / -99.6dBu (Bypass) SNR 2V RMS Output (A-weighted) -106dB (High Gain) -107dB (Low Gain) -108dB (Bypass) Aurora One Rev 1.0... - Page 19 Power Consumption 70 Watts Dimensions (Includes faceplate and feet) 17.5” x 14.25” x 4.5” Due to the open loop design of this preamplifier, actual performance will vary depending on vacuum tube quality. Specifications subject to change. Aurora One Rev 1.0...
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Page 20: Notes
Input: 1 _____________ 2 _____________ 3 _____________ 4 _____________ 5 _____________ 6 _____________ Note: __________________________________________________________________________________________ _________________________________________________________________________________________________ Gain Settings Input: 1 _____________ 2 _____________ 3 _____________ 4 _____________ 5 _____________ 6 _____________ General Notes: __________________________________________________________________________________ _____________________________________________________________________________________________________ _____________________________________________________________________________________________________ _____________________________________________________________________________________________________ _____________________________________________________________________________________________________ Aurora One Rev 1.0...