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A good user manual
The rules should oblige the seller to give the purchaser an operating instrucion of Hafler SE240, 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 Hafler SE240 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 Hafler SE240. 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 Hafler SE240 should contain:
- informations concerning technical data of Hafler SE240
- name of the manufacturer and a year of construction of the Hafler SE240 item
- rules of operation, control and maintenance of the Hafler SE240 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 Hafler SE240 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 Hafler SE240, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the Hafler 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 Hafler SE240.
Why one should read the manuals?
It is mostly in the manuals where we will find the details concerning construction and possibility of the Hafler SE240 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
OWNER’S MANUAL HAFLER SE240 POWER AMPLIFIER A Division of Rockford Corporation 613 South Rockford Drive Tempe, Arizona 85281 602 - 967 - 3565 HAFLER SE240[...]
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Page 2
SPECIFICATIONS Power Rating: Less than 0.025% total harmonic distortion at any power level up to 120 watts continuous average power per channel into 8 ohms at any frequency between 20 Hz and 20 kHz with both channels driven, Continuous Power Output: Into 4 ohms, below -04% THD, 20 Hz-20 kHz, per channel: 175 watts IM Distortion (IHF): Less than 0.0[...]
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Page 3
Input Impedance: 47,000 ohms. Input Sensitivity: 1.2 volts rms for 120 watts into 8 ohms. Slew rate: 10 kHz, 60 volts peak to peak square wave: 45 v/us Damping Factor: 300 to 1 kHz into 8 ohms. 200 to 10 kHz into 8 ohms. Power consumption: 120 watts both channels into 8 ohms: 550 VA Quiescent: 120 VA Size: 5-1/4” high plus 1/2” feet, 17” wide[...]
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Page 4
INTRODUCTION The Hafler SE-240 is a two channel audio amplifier which has been engineered to meet high performance and reliability standards while maintaining affordability. The amplifier employs a sonically proven circuit topology driving MOSFET output devices. These devices provide exceptional reliability as a result of their inherent rugged- nes[...]
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Page 5
the Hafler transformers are designed to minimize this field, certain cartridges are more sensitive than others, and require separation from the amplifier. Check at a compara- tively high volume setting, swinging the tone arm through its arc. Usually a few inches of added space is all that is needed. Line Connections and Switching The SE-240 is norm[...]
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Page 6
running them parallel to power wiring to reduce the likelihood of hum pickup. OUTPUT. The wires which connect the speakers to the amplifier should be of sufficient size to preserve the SE- 240’s high damping factor. Standard #18 gauge lamp cord (zip cord) is satisfactory for up to 15 feet if your speakers are of 8 ohms or higher impedance. A heav[...]
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Page 7
Conventional Stereo Connections It is best to make all connections with the SE-240 switched off. Each of the stereo speakers connects to one horizon- tal pair of red and black outputs, as identified left or right on back of the SE-240. The input signals connect to the corresponding input jacks, and the Mono/Stereo switch should be set to Stereo. Co[...]
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Page 8
pedance is less than 8 ohms, the SE-240 can deliver more power into the lower impedance. Sound reproduction accuracy is largely a measure of your success in satisfying an illusion of the original. There are few rules for speaker placement. The shape, furnishing and acoustics of the room contribute as much as speaker choice to the overall balance wh[...]
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Page 9
Fuses The SE-240 is supplied with a 10 ampere Slo-Blo AC line fuse and four power supply fuses. If one of these fails, it is usually indicative of a fault which will require professional service. FACTORY SERVICE AND LIMITED WARRANTY If you have any difficulties or questions concerning your SE-240 amplifier, please call our Technical Service Departm[...]