User manual CREST AUDIO CKI SERIES

[. . . ] CKi Amplifier Owner's Manual On Off Remote Protect ACL ACL Status Active Ch A Signal Ch B CKi 800s Signal Professional Power Amplifier Intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. Intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product. WARNING:To prevent electrical shock or fire hazard, do not expose this appliance to rain or moisture. Before using this appliance, read the operating guide for further warnings. Este símbolo tiene el propósito, de alertar al usuario de la presencia de "(voltaje) peligroso" sin aislamiento dentro de la caja del producto y que puede tener una magnitud suficiente como para constituir riesgo de descarga eléctrica. [. . . ] Address Amp ID Gain Temperature AC Voltage Ethernet Data Link A Fault Mute B + -10 -6 -10 -3 -15 -1 -30 dB -6 -3 -1 dB O n Co m O ff O n Co m O ff 3. 3 In V p G ut nd N /O Co m N /C A Stereo -15 -30 Parallel - Active In Out In Out Output - Class 2 Wiring Bridge Protect IGM ACL Signal B Ch A Ch B + + x20 (. 775V) 0dB x40 Mode Ch A Ch B Input Gain CV Line Ch. A + Removable Attenuator Knobs The attenuator knobs can be removed and replaced with plugs that are shipped with the amplifier. The procedure for attenuator knob removal is as follows: 1. With a small knife, remove the gray key cap of the attenuator knob revealing the inside nut. Using needle nose pliers or an appropriately sized nut driver, loosen the nut. Insert a regular screwdriver in the slotted end of the shaft and adjust attenuation to the desired level. Insert the blank plugs into the attenuator holes. Ch. A - Knob still attached Ch. B - Knob replaced with plug -10 -15 -30 llel -6 -10 -3 -15 -1 -30 dB -6 -3 -1 dB Ch A Ch B p. 18 Operation 5 Gain Select Switch The 3-position gain select switch on the rear panel to sets the overall gain of the amplifier. The left and right switch positions set the amplifier for constant gain of x20 (26 dB) or x40 (32 dB) respectively. The center position sets the amplifier for constant sensitivity. In this position, a 0dBu (0. 775 VRMS) input signal will produce maximum power at the amplifier's output. The standard factory setting is for x40 (32dB). The specifications for a specific CKi models in Appendix A contain more gain/sensitivity information. (. 775V) 0dB x20 x40 Gain Signal Ground Lift Switch The signal source equipment should share the same AC ground as the amplifier(s). In some cases, however, particularly if an amplifier is being installed in an existing system, this may result in a ground loop, creating excessive 60Hz hum at the amplifier's output. If this happens, slide the ground lift switch on the amplifier's rear panel to the "open" (left) position. In this position, the signal ground is lifted from the chassis ground and is clamped to ± 0. 6V. Do not lift the ground if the amplifier and the signal source equipment are not on the same AC ground!In a properly designed system, the amplifier should receive its ground from the AC line cord to ensure safety and minimize noise. Sequential Turn On/Off (STO) CKi amplifiers come standard with Sequential Turn-On/Turn-Off (STO) circuitry. When the amplifier front power switch is set to "remote, " a single SPDT toggle switch or two SPST momentary switches can be used to turn the amplifier on and off. Using the same switch(es), additional amplifiers can be turned on/off sequentially by daisy chaining the STO "Out" terminals of one amplifier to the STO "In" terminals of a subsequent amplifier. The standard turn-on delay time between amplifiers is approximately 100ms; turn-off delay time is 200ms. When using NexSys control with an amplifier equipped with an NxEthernet or NxCobraNet module, these standard turn-on and turn-off delay times may be modified in the control software. The shield on a balanced input line should be grounded at one end only (usually the sending end), and it must never be relied on to supply AC ground to the amplifier. a Standard Sequential Turn-On/Turn-Off Wiring For non-NexSys remote turn-on, a single SPDT toggle switch or two SPST momentary switches can be used. In either case, the switch(es) are wired to the "STO In" connector on the amplifier's rear panel and the amplifier's front panel power switch must be set to "Remote. " The switch(es) should be wired to close a connection between "Com" and "On" pins for turn-on, and between the "Com" and "Off" pins for turn-off. The diagram below illustrates the circuit: Sequential Turn-On V-In Fault When using NexSys control, hardwiring for manual switch closure between amplifiers should be used cautiously. If the switch closure output is wired up, it WILL cause the next amp to switch, regardless of which source (hardware switch or NexSys STO command) has initiated the command. + + + Active In Out In Out Output - Class 2 Wiring On Off O n Co m O ff O n Co m O ff 3. 3 In V p G ut nd N /O Co m N /C p. 19 5 Operation STO Daisy Chaining Any number of CKi amplifiers can be daisy-chained together for sequential turn-on. Wiring two amplifiers for STO is as simple as connecting the "On, " "Com" and "Off" pins of the "STO Out" connector on the first amplifier to the corresponding pins on the "STO In" connector on the second amplifier. Repeating this wiring scheme with subsequent amplifiers allows entire systems of CKi's to be wired for STO. Designed and manufactured i Crest A Fair La www. c AB A Sequential Turn-On V-In Fault + + + Active In Out In Out Output - Class 2 W O n Co m O ff O n Co m O ff 3. 3 In V p G ut nd N /O Co m N /C Designed and manufactured i Crest A Fair La www. c Modules CKi amplifiers come standard with a blank panel fixed over the module bay. When a NexSys module is installed in this bay, connection to a network is made via a standard RJ-45 connector and CAT Ethernet cable. [. . . ] If the channel has been muted by NexSys, the first press of either the increment or decrement will bring the channel out of mute and return its previous value. Subsequent presses will adjust the gain value. Once the gain has been adjusted, pressing the "Edit" button again will lock in the value and the display will stop flashing. Gain values are listed in dB, from 0 (unity) to ­80. The setting of the amplifier's attenuators will also affect the overall gain. The attenuators are positioned after the NexSys gain control in the amp's gain structure resulting in an additive attenuation value. [. . . ]