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A good user manual
The rules should oblige the seller to give the purchaser an operating instrucion of JAMO 650, 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 JAMO 650 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 JAMO 650. 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 JAMO 650 should contain:
- informations concerning technical data of JAMO 650
- name of the manufacturer and a year of construction of the JAMO 650 item
- rules of operation, control and maintenance of the JAMO 650 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 JAMO 650 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 JAMO 650, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the JAMO 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 JAMO 650.
Why one should read the manuals?
It is mostly in the manuals where we will find the details concerning construction and possibility of the JAMO 650 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
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Page 1
Technical Description Jamo SUB 250, 300, 550, 650[...]
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Page 2
General Descripti on With this d edicated subwoofer line u p fr om Jamo we wa nted to achieve several goal s. We wanted a subwoofer line up with th e best ever performance per $ and we wanted it to be able to mat ch a variet y of different speaker solutions on the market, including Jamo of cou rse. Making a dedicat ed subwoofer lin e up, inst ead o[...]
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Page 3
Because of the flat frequency response all the way to 150Hz, SUB 250 is the ideal match for small satellite spea kers, since it allows you to integrate it seamlessly without missing the important middle bass area . Many su bwoofers fa ll of ve ry dra sti cally above 100Hz (o r some even under, see picture 2) making them very hard to integrat e with[...]
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Page 4
Since SUB 550 reaches very l ow, it features a B ound ary G ain C ompensatio n switch, which further helps to keep a flat frequency response, as BGC compensates for the room infl u ence at low frequencies. The level control is pla ced on the front of the subwoofer, elegantly integrated in the design, with a soft blue li ght indicating the volume se[...]
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Page 5
Electronics The im port ant th ings on su bwoof er am plif iers a re the ability to deliver high power – especially peak burs t are impo rtant to rep roduc e e.g. an explosion or a bass drum with full fidelity. This has to be done wi th a minimum of distortion and a very ti ght c ontrol of the woof er. Due to the nature of a norm al class AB ampl[...]
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Page 6
Most of to day’s sub woofers have an auto o n/standby feature where by the subwoofer switches itself on if it sen ses a signal and switches in standby mode again a certain time after it has last se nsed a signal. Ho wever, in mo vies (or typically classical music) with relatively quie t passages t he subwoofer can switch to standby mode thereby ?[...]
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Page 7
In/ Out put s All the subwoofers features speaker level inpu ts if there is lack of a line leve l/LFE level output on the amplifier/receiver. All sub woofers also have both left and ri ght line le vel input in case of st ereo sources and a loop through capability, i. e case the sign al needs to be r outed through to a secon d subwoofer. The SUB 650[...]
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Page 8
In normal setup, the po rt is radiat ing towards t he rear wall, giving an even higher efficiency at very low frequencies.[...]
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Page 9
Technical Specifications Speaker name SUB 250 SUB 300 SUB 550 SUB 650 System Slotted Bass re flex Port Slotted Bass refle x P ort Slotted Bass reflex Port Closed Cabinet Woof er 8” down firing 10” down firing 10” down firing 12” front firing Peak po we r [W ] 250 300 550 650 Freq u enc y rang e [H z] 30-15 0 + 3dB 28-150 + 3dB 26-150 + 3dB [...]