QSC LF-4215 manual

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A good user manual

The rules should oblige the seller to give the purchaser an operating instrucion of QSC LF-4215, along with an item. The lack of an instruction or false information given to customer shall constitute grounds to apply for a complaint because of nonconformity of goods with the contract. In accordance with the law, a customer can receive an instruction in non-paper form; lately graphic and electronic forms of the manuals, as well as instructional videos have been majorly used. A necessary precondition for this is the unmistakable, legible character of an instruction.

What is an instruction?

The term originates from the Latin word „instructio”, which means organizing. Therefore, in an instruction of QSC LF-4215 one could find a process description. An instruction's purpose is to teach, to ease the start-up and an item's use or performance of certain activities. An instruction is a compilation of information about an item/a service, it is a clue.

Unfortunately, only a few customers devote their time to read an instruction of QSC LF-4215. A good user manual introduces us to a number of additional functionalities of the purchased item, and also helps us to avoid the formation of most of the defects.

What should a perfect user manual contain?

First and foremost, an user manual of QSC LF-4215 should contain:
- informations concerning technical data of QSC LF-4215
- name of the manufacturer and a year of construction of the QSC LF-4215 item
- rules of operation, control and maintenance of the QSC LF-4215 item
- safety signs and mark certificates which confirm compatibility with appropriate standards

Why don't we read the manuals?

Usually it results from the lack of time and certainty about functionalities of purchased items. Unfortunately, networking and start-up of QSC LF-4215 alone are not enough. An instruction contains a number of clues concerning respective functionalities, safety rules, maintenance methods (what means should be used), eventual defects of QSC LF-4215, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the QSC service. Lately animated manuals and instructional videos are quite popular among customers. These kinds of user manuals are effective; they assure that a customer will familiarize himself with the whole material, and won't skip complicated, technical information of QSC LF-4215.

Why one should read the manuals?

It is mostly in the manuals where we will find the details concerning construction and possibility of the QSC LF-4215 item, and its use of respective accessory, as well as information concerning all the functions and facilities.

After a successful purchase of an item one should find a moment and get to know with every part of an instruction. Currently the manuals are carefully prearranged and translated, so they could be fully understood by its users. The manuals will serve as an informational aid.

Table of contents for the manual

  • Page 1

    *TD-000141-00* Cinema Loudspeaker Sy stems User Manual LF-4215 and LF-4215-8 Low Frequenc y Loudspea kers Introduction The LF-4215 dual 15” (381mm) low frequency enclosure is designed specific ally for cinema applications. Meeting cinema requirements for extended low frequency response differentiates the LF-4215 from more conventional “rock-and[...]

  • Page 2

    Connections Normal Connecti on The LF-4215 has barrier strip screw termi- nals for connection. The terminals accept up to #10 AWG stranded loudspeaker wir- ing. Use the largest wire size and shortest wire length possible for a given installa- tion. Observe the polarity markings and keep polarity consistent throughout the system for best performance[...]

  • Page 3

    LF-4215 Specifications (subject to change w ithout notice) Frequency Range: 38 - 1300 Hertz (±3 dB) 30 - 1400 Hertz useable range (-10 dB) Nominal Coverage: 100° horizontal X 55° vertical at 600 Hertz Maximum Output: 134.5 dB SPL calculated peak, 1 met er , half spac e, at rated rms power with 6 dB crest f actor pink noise input , 25 - 25 0 Hert[...]

  • Page 4

    Warranty (USA only; ot her countries, see your dealer or distributor) Disclaimer QSC Audio Products, Inc. is not liable for any damage to amplifiers, or any other equipment that is caused by negligence or improper installation and/or use of this loudspeaker product. QSC Audio Products 3 Y ear Limited Warranty QSC Audio Products, Inc. (“QSC”) gu[...]