Amplifier Operation

SystemNoise Considerations

It is easyto understandthe operationof the

ACgroundingbecomescritical whencon-

nectinghigh performanceaudiocomponents.

KAV-250aamplifier. However,great care

Whenmixing and matching audio compo-

needsto be exercisedwhenoperatinga sys-

nents,eachwiththeir owngroundpotential,a

temthat includes the KAV-250a,becauseof

low frequencyhummayoccurin oneor both

the amplifier's enormouspoweroutput.

speakersThis. oftenoccurswhenintroducing

Switchingbetweenactive sourceswithout

mutingthe preamplifier output, or bump- ¯ a newcomponentinto a system.

ing/miscuinga cartridge, cangeneratelarge

If there is a low frequencyhumemanating

transients at low frequencies.TheKAV-250a from the speakers when the KAV-250aamplifier maygenerateenoughpowerwith amplifier is placedinto the system,follow thesetransients to damagemostloudspeak- thesesimpletrouble-shootingsteps before

ers. All switchingof sourcesshouldbe done contactingyourauthorizedKrell dealer,dis-

withthepreamplifierlevel eithermutedor fully

tributor,or Krell®:

attenuatedDo.notchangeinputsto the ampli-

1. Checkall input andoutputconnections,

fier whiletheamplifieris On.

NOTE:Care must be taken whensetting

makingsure they are of soundconstruc-

tion. Withthe amplifier Off, removethe

high playback levels. Becauseof their

interconnectwiringandturn the amplifier

tremendousreserve of clean power,Krell

On.If the humdisappears,turn the ampli-

amplifierscansafelydrive speakersto high-

fier Off andreinsertoneof theintercdn-

er soundpressurelevels than other ampli-

nectcables.Thenturn the amplifier back

fiers. Alwaysturn the level downat thefirst

On.If the humreappearswith oneor both

sign of speakerdistress.

interconnectsreinserted,there maybe a

 

defective cable. Havethe interconnect

On~OffandStandbyOperation

cablingcheckedbeforeproceeding.

2. If the interconnectsproveto besound,

Whenpoweringup any system,amplifiers

youmaybe experiencinga groundloop.

shouldalwaysbeturnedonlast andturnedoff

Thiscanoftenbeeasily eliminated.Con-

first.

tact yourauthorizedKrell dealer,distribu-

 

1. Pressthe powerbuttononthe front panel

®.tor, orKrell

of theamplifier.Youwill heara click. The amplifieris readyfor operation.

2. Withthepreamplifierin theMuteposition, or 'the volumecontrol fully attenuated, select a source.Turnthe volumecontrol upto thedesiredlisteninglevel.

3. Whenturning the systemoff, lower the volumeof the preamplifiercompletelyor placeit into the Muteor Stand-byposi-

tion. Switchthe amplifier to Stand-byby pressingthe powerbutton.It is nowsafe to turn off therest of thesystem.

®

English Page7 of 12KRELL KAV-250a

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Krell Industries KAV-250a manual Amplifier Operation, SystemNoise Considerations

KAV-250a specifications

Krell Industries has long been synonymous with high-fidelity audio equipment, and the KAV-250a amplifier stands as a testament to the company's dedication to producing premium sound solutions. This powerful amplifier is engineered to deliver exceptional performance, making it a sought-after component for audiophiles and home theater enthusiasts.

The KAV-250a is a solid-state amplifier, featuring Krell's renowned fully complementary circuit topology. This design principle ensures that both positive and negative signal paths are treated equally, resulting in a cleaner and more precise audio output. With a power rating of 250 watts per channel into 8 ohms, and an impressive 500 watts per channel into 4 ohms, the KAV-250a can easily drive a wide range of loudspeakers, from efficient models to more demanding ones.

One of the standout characteristics of the KAV-250a is its sophisticated power supply. It incorporates a massive toroidal transformer and large reservoir capacitors, which not only enhance dynamic range but also contribute to the amplifier's ability to reproduce transient sounds accurately. This robust power supply design allows for impressive control over the speakers, resulting in tight bass response and a more engaging listening experience.

The KAV-250a also features Krell's proprietary Cast technology, which is designed to minimize distortion and maximize signal fidelity. This balanced differential circuit helps maintain the integrity of the audio signal throughout the amplification process, ensuring that listeners experience music exactly as the artist intended. Additionally, the amplifier is designed with both balanced XLR and single-ended RCA inputs, providing flexible connectivity options for various audio sources.

Thermal management is another key consideration in the KAV-250a's design. The amplifier incorporates a sophisticated heat sink system that efficiently dissipates heat, ensuring reliable performance even during extended listening sessions. This attention to cooling not only protects the internal components but also contributes to the overall longevity of the unit.

In summary, the Krell KAV-250a amplifier embodies the pinnacle of audio innovation and engineering excellence. Its powerful performance, advanced technologies, and high-quality build materials position it as a leading choice for those seeking to enhance their audio system. Whether for critical listening or immersive home theater applications, the KAV-250a delivers an unparalleled audio experience that truly reflects Krell's legacy in high-end audio.