Instruction/ maintenance manual of the product 21K Knoll
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21K S tereo am plifier speci ficati ons Inputs: Gold RCA jacks with adjustabl e gain Input impedance: 50k ohms Outputs: 5 way gold insul ated binding posts Output power: 90 watts RMS per chan nel (8 o.
Important Safet y Instructi ons: 1) Read these instructions. 2) Keep these instructions. 3) Read all warnings. 4) Follow all instructions. 5) Do not use this apparatus near water. 6) Clean only with dry cloth. 7) Do not block any ventilation openings.
Do not use thi s amplifier near water includin g near a bathtub, swimming pool or hot tub . This unit should be i nstalled so that its locati on does not interfere with proper v entilation.
Hum and noi se In most cases, one of th e following suggestions should help you solve a hum noise in your system. Please try th ese steps in the order shown; proceedi ng from one step to the next if the prior suggestion does not elim inate the problem.
Getting to know the rea r panel A. Audio Inputs Use the INPUT jacks to conne ct the outputs of a preamplifier, receiver wi th pre-out connecti ons, CD player, or other control devices. B. Inp ut Gain Controls Use these to adjust the i nput gain of each chan nel.
turn off, check your speake rs to verify that they are operating properly. If all other pot ential sources of troubl e check out properly, contact Knoll for further assistance. Knoll System s se rvice informati on The 21K ampli fier does not contain any user servi ceable parts inside.
speaker cones will be moving in, whil e others move out. This will cause indi stinct or confusing imaging, and muddled and cloudy sounds. To avoi d incorrect phasing or polarity, be sure to use wire that has disti nct marking s, colors, stripes, wording, or grooves on each si de of the speaker cable.
When installin g, make sure the 21k front panel power swit ch is in the out or “OFF” positi on. Plug the DC adapte r into a switched outlet on the source devi ce that will be activat ed when you want to have the ampli fier turn on. This may be the swi tched outlet at the rear of an AC recei ver or other audi o equipment.
An important point after buying a device Knoll 21K (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Knoll 21K yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Knoll 21K - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Knoll 21K you will learn all the available features of the product, as well as information on its operation. The information that you get Knoll 21K will certainly help you make a decision on the purchase.
If you already are a holder of Knoll 21K, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Knoll 21K.
However, one of the most important roles played by the user manual is to help in solving problems with Knoll 21K. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Knoll 21K along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
