Krell Industries KAV280p manuale d’uso

Instructions for Use Owner ’ s Reference THE LEADER IN AUDIO ENGINEERING KA V– 280p Remote Control Preamplifier[...]

Krell Industries, Inc. 45 Connair Road Orange, CT 06477-3650 USA TEL 203-799-9954 F AX 203-891-2028 E-MAIL krell@krellonline.com WEBSITE http://www .krellonline.com This product complies with the EMC directive (89/336/EEC) and the low-voltage directive (73/23/EEC). Do not place the preamplifier where it could be exposed to dripping or splashing. Th[...]

Krell KA V–280p iii Contents Page INTRODUCTION 1 DEFINITION OF TERMS 2 UNP ACKING 3 PLACEMENT 4 AC Power Guidelines 4 FRONT P ANEL DESCRIPTION 6 BACK P ANEL DESCRIPTION 9 REMOTE CONTROL DESCRIPTION 12 Battery Installation and Removal 12 Remote Control Functions 12 CONNECTING THE KA V–280p TO YOUR SYSTEM 15 Connection Steps 15 OPERA TING YOUR KA[...]

iv Krell KA V–280p Illustrations FIGURE 1 The KA V–280p Front Panel 5 FIGURE 2 The KA V–280p Back Panel 8 FIGURE 3 The KA V–280p Remote Control 1 1 Page[...]

Krell KA V–280p 1 Introduction Thank you for your purchase of the Krell KA V–280p Remote Control Preamplifier . The KA V -280p uses current mode and sur- face mount technologies derived directly from the state-of-the-art Krell KCT Preamplifier . The Class A direct-coupled design of the KA V–280p means that the signal path is fully balanced fr[...]

Definition of T erms OPERA TION Following are the definitions of key terms used in your owner ’s ref- erence manual. Theater Throughput Theater Throughput is a Krell configuration option that allows the signal from a surround preamp/processor to pass through a Krell preamplifier or integrated amplifier with no gain, for integrated vol- ume and ba[...]

Definition of T erms, continued Krell Current Mode A proprietary Krell circuit topology in which the audio gain stages of a component operate in the current rather than voltage domain. This unique technology provides the component with exceptional speed and a wide bandwidth. Surface Mount T echnology (SMT) SMT allows individual circuit elements to [...]

4 Krell KA V–280p Placement Before you install the KA V–280p into your system, review the fol- lowing guidelines to choose the location for the KA V–280p. This will facilitate a clean, trouble-free installation. The KA V–280p does not require any type of special rack or cabinet for installation. For the dimensions of the KA V–280p, see Sp[...]

Figure 1 The KA V–280p Front Panel MUTE TAPE POWER STAND-BY KA V–280p 3 1 2 4 5 B– 1 S– 1 S– 2 S– 3 7 11 6 9 10 8 Mode Indicators 8 Mute Button 9 Mute LED V olume Adjustment Functions 10 Level Knob 11 Front Panel Display Power 1 Power Button 2 Power LED 3S tand-by LED 4 Infrared Sensor Analog Devices 5 S-1, S-2, S-3, and B-1 Buttons and[...]

6 Krell KA V–280p The front panel of the KA V–280p accesses power on and off, analog input selections, volume control, and mute. The front panel display shows the volume and balance levels, and Theater Throughput status. 1 Power Button Use this button to switch the KA V–280p between the stand-by and the operational modes. 2 Power LED The blue[...]

Krell KA V–280p 7 Front Panel Description continued 8 Mute Button Use this button to interrupt the signal from the active source you have selected. When the red mute LED (9) on the KA V–280p is illuminated, there is no signal output. To unmute the signal from the active source, press the mute but- ton again. The red mute LED extinguishes. 9 Mut[...]

Figure 2 The KA V–280p Back Panel 50/60 Hz OUT R MAIN OUT MAIN OUT L L R L R L Preamplifier TAPE OUT R L R L TAPE IN R L R L R MADE IN USA IN 12V NO USER SERVICEABLE PARTS INSIDE B– 1 S– 2 S– 3 RC–5 IN KAV– 280p 12 13 14 16 17 18 20 19 21 15 Analog Inputs 12 Left and Right Balanced Analog Inputs 13 Left and Right Single-ended Analog Inp[...]

Back Panel Description See Figure 2 on page 8 Krell KA V–280p 9 The KA V–280p back panel provides connections for all inputs and outputs, power on/off, and additional remote connections. 12 Left and Right Balanced Analog Inputs The KA V–280p is equipped with one pair of balanced (B-1) inputs via XLR connectors. 13 Left and Right Single-ended [...]

Back Panel Description, continued 10 Krell KA V–280p 17 12 VDC In The KA V–280p is equipped with an input that receives 12 VDC (12 V trigger) power on/off signals from other Krell components and other devices that incorporate a 12 V trigger . This allows you to turn the KA V–280p on or off, or to and from stand-by , from other components. The[...]

Figure 3 The KA V–280p Remote Control Krell KA V–280p 11 22 23 25 24 26 27 28 Power 22 Power Key 23 Pre Key Analog Functions 24 Analog Input Keys 25 T ape Key Output Control Functions 26 Mute Key 27 V ol (V olume) Keys 28 Bal (Balance) Keys Note The remote control keys listed above function with the KA V–280p. Other keys on this remote contro[...]

Remote Control Description See Figure 3 on page 1 1 12 Krell KA V–280p The KA V–280p remote control uses one CR2025 lithium battery , which is included with the shipment. To open the battery compartment on the back of the remote control: 1. Place the remote face down on the table. 2. Use your thumbnail or a small jeweler ’s or eyeglass screw-[...]

Remote Control Functions continued Krell KA V–280p 13 23 Pre Key Use this key to activate the KA V–280p remote and access other pre- amplifier commands. Y ou can then access preamplifier commands until you press a different activation key , for example the CD key to access commands for a Krell compact disc player . T o return to the preamplifie[...]

Remote Control Functions continued 14 Krell KA V–280p To access and display balance, push either the “L” or the “R” bal- ance key on the remote. The front panel display indicates the bal- ance setting. After 3 seconds of inactivity or after a volume adjust- ment, the front panel display reverts to the volume setting. The front panel displ[...]

Krell KA V–280p 15 Krell recommends using balanced interconnect cables. Balanced interconnect cables not only can minimize sonic loss but are also immune to induced noise, especially with installations using long cables. Balanced connections have 6 dB more gain than single- ended connections. When level matching is critical, keep this gain value [...]

16 Krell KA V–280p Pin 1 Shield (ground) Pin 2 Non-inverting (hot) (0°) Pin 3 Inverting (cold) (180°) RC-5 IN This input accepts baseband RC-5 input commands. It facilitates custom installations by allowing the KA V–280p to be controlled via hard-wired signals from various remote devices. 12 VDC REMOTE POWER IN / OUT The input accepts 12 V ol[...]

Krell KA V–280p 17 This section provides information about operating the KA V–280p. The KA V–280p provides basic input selection and volume control operation from the front panel. The remote control includes addi- tional preamplifier functions as well as CD transport and amplifier controls. See Remote Control, on page 12, for more information[...]

18 Krell KA V–280p The KA V–280cd has a discrete tape input and output. The tape output is used to send an input signal from S-1, S-2, S-3, or B-1 to a recording device or processor . Y ou can use the tape feature in three ways: 1. Use this button to playback pre-recorded tapes. 2. Use the tape input to compare the output signal of a three- hea[...]

Krell KA V–280p 19 To simplify the integration of an audio/video surround sound processor into your system, set any input on the KA V–280p (S-1, S-2, S-3, or B-1) to operate as a unity gain stage. Krell calls this configuration Theater Throughput. When you configure a KA V–280p input for Theater Throughput, the KA V–280p volume and balance [...]

20 Krell KA V–280p AC grounding becomes critical when connecting high performance audio components. When you mix and match audio components, each with its own ground potential, a low frequency hum may occur in one or both loudspeakers. This sometimes occurs when introducing a new component into a system. If a low frequency hum emanates from the l[...]

Krell KA V–280p 21 Q. Should I leave my KA V–280p on all the time? A. Krell recommends leaving the amplifier in the stand-by mode, ready to play music. If you are not going to play music for a long time, you may disconnect the amplifier from AC power supply . Q. When I turn on the amplifier there is a loud hum through the loudspeakers. What sho[...]

22 Krell KA V–280p This Krell product has a limited warranty of five years for parts and labor on circuitry . Should this product fail to perform at any time during the warranty , Krell will repair it at no cost to the owner , except as set forth in this warranty . The warranty does not apply to damage caused by acts of God or nature. The warrant[...]

Krell KA V–280p 23 Return Authorization Procedure If you believe there is a problem with your component, please con- tact your dealer , distributor , or the Krell factory to discuss the problem before you return the component for repair . T o expedite service, you may wish to complete and e-mail the Service Request Form in the Service section of [...]

FREQUENCY RESPONSE 20 Hz-20 kHz +0 dB, -0.04 dB 0.2 Hz-300 kHz +0, -3 dB SIGNAL TO NOISE RA TIO >98 dB “A” weighted >90 dB wideband TO TA L HARMONIC DISTORTION (THD) 20 Hz-20 kHz <0.004% GAIN 6.2 dB single-ended output 12.3 dB balanced output OUTPUT 9 V rms single-ended output 18 V rms balanced output INPUT IMPEDANCE 43 kOhms single-en[...]