User manual THETA DIGITAL CITADEL

[. . . ] THETA DIGITAL C O R P O R A T I O N Citadel Owner's Manual PREFACE CONGRATULATIONS You have just acquired one of the most advanced and versatile components for the amplification of audio ever to have been developed. IMPORTANT Save all packaging in a dry place away from fire hazards. Your Citadel is a precision electronic instrument and should be properly packaged any time shipment is made. In the unlikely event that you have to return your Citadel to the factory or dealer for service or updating, the original packaging will best protect the unit from shipping damage. In order to achieve the fullest flexibility and enjoyment from your Citadel, we at Theta recommend that you read this manual in full before connecting the unit to your audio system. [. . . ] SINGLE-ENDED/BALANCED input selector switch. Activates either the single-ended or balanced input jack. This is used only if the optional DAC board is installed. Disconnects AC to all circuits except optional DAC. It is recommended that this be left ON at all times during regular use with the exception of whenever cables are connected/disconnected or when the unit is not going to be used for an extended period of time. If necessary, replace with same type and rating only. If necessary, replace with same type and rating only. Main amplifier AC POWER INPUT. Figure 4 ­ Rear Panel Layout showing most options installed 19. Used only if the optional DAC board is installed and used. 6 OPERATION Before turning on the Citadel, ensure that all precautions and warnings have been carefully reviewed and adhered to. Damage to the Citadel caused by improper operation, wiring and/or ventilation will not be covered under warranty and Theta will not be liable for any consequential damage or loss. Connecting the Citadel With both of the Citadel's rear panel main power switches turned off, connect the signal outputs of the preamp/processor to either the single-ended or balanced input of the Citadel. Connect the output to the input of the speaker that is intended to be driven. Set the rear panel SINGLE-ENDED/BALANCED switch to the appropriate position, depending on which analog input is being used. If the Citadel has a second binding post output connector, this is to be connected to the second speaker input terminal. If the Citadel has an optional DAC board installed, connect the digital output of the preamp/processor to the appropriate digital input of the Citadel. Please Note: The Citadel is a balanced bridge amplifier, thus the negative speaker terminal is NOT a ground, and cannot be connected to a ground or a loudspeaker system with a common ground. Consult your speaker manufacturer to ensure that any speaker in your system that will be connected to the Citadel does NOT have internal circuitry with a common ground. Connect a 12V pulse trigger source to the STANDBY trigger input of the Citadel, if it is desired to be taken in and out of standby via another device. Connect a 12V pulse trigger source to the INPUT SELECT trigger input of the Citadel if it is desired to have an external trigger source select between the analog and digital input of the Citadel. If the Citadel's functionality is to be controlled from a remote controller via RS232, connect the RS232 cable between the Citadel and the controller, using either the DB9 or RJ45 RS232 connector on the Citadel. Setup and Operation Turn the output volume of the preamp/processor, or other source device, down all of the way. Turn on the MAIN POWER ANALOG switch, located on the rear panel. If the optional DAC is to be used, also turn on the MAIN POWER DIGITAL switch. When first turning on the rear panel power switch, the red STANDBY LED on the front panel will illuminate, indicating that the Citadel is in standby mode. [. . . ] If the purchaser registers the unit with Theta by mailing in the warranty card, together with a copy of the bill of sale, within 14 days of the date of purchase, said purchaser will be registered for an extended service contract. The extended service contract extends the 90 days to a period of 5 years from the date of purchase by the original purchaser or no later than 7 years from the date of shipment to the authorized Theta dealer, whichever comes first. CONDITIONS This warranty is subject to the following conditions and limitations. The warranty is void and inapplicable if the product has been used or handled other than in accordance with the instructions in the owner's manual, abused or misused, damaged by accident or neglect or in being transported, or if the defect is due to the product being repaired or tampered with or modified by anyone other than Theta or an authorized Theta repair center. [. . . ]