Questions and Answers

Q. Should I leave my Full Power Balanced amplifier on at all times?

A.For maximum amplifier performance, leave the back panel power breaker switch on at all times. This places the amplifier in stand-by mode. Full Power Balanced amplifiers are designed to be powered on and off from stand- by, using the front panel power button. This eliminates “cold start” degradations. The ampli- fier will operate at full performance within min- utes.

Q.When I turn on the amplifier there is a loud hum through the speakers. What should I do?

A.When a new component is introduced, a low frequency hum may occur in one or both speak- ers. Check all input and output connections and cables, making sure they are of sound con- struction. See How to Troubleshoot System Noise, on page 17. If the interconnects and cables are sound, you may be experiencing a ground loop. This can often be easily eliminat- ed. Please contact your authorized Krell dealer, distributor, or Krell for suggestions on how to solve this problem.

Q.My system includes multiple pairs of speak- ers. Can I connect them to my Full Power Bal- anced amplifiers through a speaker selector box?

A.No. Most speaker selector boxes use a com- mon ground scheme. The differential circuitry in Full Power Balanced amplifiers prohibits the use of these devices. Do not connect a Full Power

Balanced amplifier to a speaker selector

device that employs a common ground scheme, as it may short-circuit the amplifier output.

Q.My speakers have only one pair of binding posts, but my Full Power Balanced stereo amplifier has two pairs. Which pair of speaker binding posts should I use, the upper or the lower?

A.The upper and lower pair of speaker bind- ing posts on Full Power Balanced stereo ampli- fiers are identical. You can use either the upper or lower pair; they work and sound the same. See Connecting the Full Power Balanced Amplifier to Your System, on page 13.

Q.My speakers are rated for 150 Watts. Are the Full Power Balanced 400cx or 700cx mod- els too powerful for them?

A.No. A speaker seldom is damaged from overdriving. More often, damage occurs when an amplifier that lacks sufficient power is asked to handle heavy demand situations such as high playback levels. These amplifiers may have very high 8 Ohm power ratings, but in heavy demand situations they can be driven into clipping (in which DC current goes to speakers due to loss of amplifier power). Clip- ping can damage speakers. Avoid damage to your speakers by reviewing your speaker’s specifications and exercise caution in heavy demand situations.

Krell Full Power Balanced X Series Power Amplifiers

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Krell Industries 700cx, 400cx, 300cx, 750Mcx, 450Mcx, 350Mcx manual Questions and Answers
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700cx, 400cx, 300cx, 750Mcx, 450Mcx, 350Mcx, 700cx, 400cx, 450Mcx, 350Mcx specifications

Krell Industries is renowned for its high-performance audio equipment, particularly its line of powerful amplifiers that deliver premium sound quality. Among these, the 450Mcx, 700cx, 400cx, 350Mcx, and 750Mcx models stand out for their robust capabilities and advanced technologies, making them popular choices for audiophiles.

The 450Mcx is a class AB power amplifier capable of delivering an impressive 450 watts per channel into 8 ohms. This model is equipped with Krell's signature current-mode topology, which ensures a high level of linearity and a dramatic reduction in distortion. With a heavy-duty construction, including a massive power supply, the 450Mcx offers deep bass response and engaging midrange clarity.

Next in line is the 700cx, which pushes boundaries with 700 watts per channel. This amplifier features Krell's Advanced Power Supply (APS) technology, enabling it to maintain stability even under the most demanding speaker loads. The result is explosive dynamics and captivating detail, delivering a listening experience that is both immersive and exhilarating.

The 400cx is designed for versatility, providing 400 watts per channel in a compact form. This model utilizes Krell's patented CAST technology, which minimizes signal degradation, ensuring that the audio signal retains its integrity from input to output. It is ideal for both home theater and stereo applications, allowing users to enjoy a rich sonic palette.

The 350Mcx, while delivering a powerful 350 watts per channel, is designed with a focus on reliability and heat dissipation. The dual-transformer design and sophisticated thermal management system ensure consistent performance, even during prolonged usage. It embodies Krell's commitment to sound fidelity and performance longevity.

The 750Mcx takes performance to the next level with remarkable output capabilities. This amplifier is built with multiple output devices in a high-current configuration, designed to drive even the most challenging loudspeakers. Its refined circuitry contributes to a soundstage that is both wide and deep, enriching the listening experience.

In addition to these models, Krell also offers the 300cx and the 350Mcx, both designed to cater to a variety of audio preferences and configurations. Each unit is meticulously engineered to deliver ultrasensitive dynamics and a transparency that brings recordings to life.

These Krell amplifiers not only emphasize power and performance, but they also showcase luxurious design and durability. The combination of advanced technologies, such as current mode and APS, ensures that users receive a premium audio experience that stands the test of time. Whether for professional use or high-end home listening, Krell amplifiers are truly an investment in quality sound.
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