User manual ELK PRODUCTS ELK-870 V.1

[. . . ] This arrangement enriches the low frequency ranges and reduces the undesirable high "tinny" frequencies. The attractive "no-grille" surface of the ELK-870 may be painted or wallpapered to match the surrounding decor. For additional coverage, up to three (3) external 8 Ohm speakers may be wired in parallel with the internal speaker. [. . . ] Remove the front cover by inserting and twisting the tip of a wide flat-blade screwdriver in the slots along the edge of the housing. Mounting holes are provided on the backplate for a standard electrical J-box as well or for direct surface mounting (hardware included). If distance exceeds 1000' use 18-20 guage. PWR IN: AUDIO IN: Connect a good quality 12 to 24 Volt A. C. ie: microphone, radio, computer sound card, telephone PBX or KEY system paging output, etc. , even an ordinary single line phone set (see diagram below). With Jumper JP1 set in the NO PREAMP position the ELK-870 is setup for an audio signal of -15 dbm to + 10 dbm. This jumper may be placed in the PREAMP position to provide +18dbm addition gain for weak audio input signals Internal speaker already connected. The ELK-870 speaker output can handle up to a maximum load of two (2) Ohms. Up to three (3) additional 8 Ohm speakers (MIN = 20 Watt (ELK-70, ELK-14, ELK-1. . . ) may be connected in parallel on these two terminals. SPKR: Recommended ELK-870 Spacing For Background Paging Applications Ambient Sound Level Quiet 50 to 65db Moderate 65 to 80db Noisy 80 to 90db Very Noisy +90cb VOLUME: PREAMP: Location Offices Light manufacturing Heavy manufacturing Speaker Spacing 120 feet (14, 400 sq. feet) Turn the volume control clockwise (CW) to increase volume. If the audio input signal is too low for proper amplification, place Jumper JP1 into the PREAMP position for an additional audio input gain of +18 dbm (8 X gain). Audio Source 12 to 24 Volts Microphone, Radio, PC Sound Card, Telephone System Paging Output AC or DC No Polarity PWR IN 12 to 24 Volts DC ONLY AUDIO IN - + 1, 000 Ohm 1/2 Watt Resistor Built-In 20 Watt Speaker MIN VOLUME MAX PWR IN AUDIO IN DO NOT CONNECT TO TELCO LINES GREEN RED ELK-870 Audio Amp PC Board SPKR EXAMPLE 1: BASIC PUBLIC ADDRESS "PA" SYSTEM (using the ELK-870 and a plain Telephone) OPTIONAL Up to three (3) additional 8 Ohm speakers may be connected in parallel Min. rating = 20 watt IE: ELK-70, ELK-14, ELK-1, ELK-44. . . FIGURE 1: WIRING HOOKUP LIFETIME LIMITED WARRANTY Elk Products, Inc. ("Manufacturer") warrants to the original purchaser (the "Customer") that the products it manufactures ("Product") shall be free from defects in material and workmanship at time of shipment. Manufacturer's obligations under this Limited Warranty shall be limited to repairing or replacing, at its option, free of charge, any product returned to Manufacturer freight prepaid. Manufacturer shall have no obligation under this Limited Warranty or otherwise if (1) the Product has been damaged by negligence, accident, mishandling, lightning or flood, or other Acts of God, (2) the Product has not been operated in accordance with its operating instructions, (3) the Product has been altered or repaired by anyone outside Manufacturer's authorized facilities (4) adaptations or accessories have been made or attached to the Product which, in Manufacturer's sole determination, have adversely affected its performance, safety or reliability. [. . . ] UNDER NO CIRCUMSTANCES SHALL MANUFACTURER BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS AND REVENUES, INCONVENIENCE OR INTERRUPTIONS IN OPERATIONS, OR ANY OTHER COMMERCIAL OR ECONOMIC LOSSES OF ANY KIND. THESE LIMITATIONS AND DISCLAIMERS ARE NOT MADE BY MANUFACTURER WHERE PROHIBITED BY LAW. SOME STATES PROHIBIT LIMITATIONS OF WARRANTIES AND THE CUSTOMER MAY HAVE ADDITIONAL RIGHTS IN THOSE STATES. [. . . ]