THE LEADER IN AUDIO ENGINEERING Full Power Balanced X Series Power Amplifiers 700cx, 400cx, 300cx Stereo 750Mcx, 450Mcx, 350Mcx Monaural with Krell CAST II Technology Instructions for Use Owner’s Reference
Full Power Balanced X Series Power Amplifiers 700cx, 400cx, 300cx Stereo 750Mcx, 450Mcx, 350Mcx Monaural with Krell CAST II Technology Krell Industries, Inc. 45 Connair Road Orange, CT 06477-3650 USA TEL 203-799-9954 FAX 203-891-2028 E-MAIL krell@krellonline.com WEBSITE http://www.krellonline.com v 02.0 This product complies with the EMC directive (89/336/EEC) and the low-voltage directive (73/23/EEC).
Contents Page INTRODUCTION 1 DEFINITION OF TERMS 1 REVOLUTIONARY KRELL CAST and CAST II TECHNOLOGY 3 UNPACKING 4 PLACEMENT AC Power Guidelines 4 5 FRONT PANEL DESCRIPTION 700cx, 400cx, and 300cx Stereo Power Amplifiers 750Mcx, 450Mcx, and 350Mcx Monaural Power Amplifiers 8 8 8 BACK PANEL DESCRIPTION 700cx, 400cx, and 300cx Stereo Power Amplifiers 750Mcx, 450Mcx, and 350Mcx Monaural Power Amplifiers 11 11 12 CONNECTING THE FULL POWER BALANCED AMPLIFIER TO YOUR SYSTEM Input and Output Connectio
Illustrations Page FIGURE 1 Full Power Balanced Stereo Amplifier Front Panel 6 FIGURE 2 Full Power Balanced Monaural Amplifier Front Panel 7 FIGURE 3 Full Power Balanced Stereo Amplifier Back Panel 9 FIGURE 4 Full Power Balanced Monaural Amplifier Back Panel iv 10 Krell Full Power Balanced X Series Power Amplifiers
Introduction Definition of Terms The Full Power Balanced X Series consists of three stereo amplifiers, the Full Power Balanced 700cx, 400cx, and 300cx Stereo Power Amplifiers and three monaural amplifiers, the Full Power Balanced 750Mcx, 450Mcx, and 350Mcx Monaural Power Amplifiers. Installation, connection, and operation of all amplifiers in the Full Power Balanced series are identical; however, a pair of Full Power Balanced Monaural amplifiers are required for stereo operation.
Definition of Terms, continued Single-ended A two-wire input or output circuit. Use care when using single-ended connections as the ground connection is made last and broken first. Turn the system off prior to making or breaking single-ended connections. Singleended connections are not recommended for connections requiring long cable runs. OPERATION Off When the power switch on the back panel is placed in the down position and the blue power LEDs turn off, the component is off.
Revolutionary Krell CAST and CAST II Technology Current Audio Signal Transmission, termed CAST, is a revolutionary method of connecting analog audio components for unparalleled sonic performance. CAST circuitry, and the CAST circuitry update, Krell CAST II, combine innovative engineering with existing Krell Current Mode technology to create entire CAST systems that reproduce music with incredible range, tonality, and precision.
Unpacking Placement Two people are needed to remove the Full Power Balanced amplifier from its shipping box safely and easily. Before you install the Full Power Balanced amplifier into your system, please follow the guidelines in this section to choose its proper location. This will facilitate a clean, trouble-free installation. 1. Open the shipping box and remove the top layer of foam.
Placement, continued AC POWER GUIDELINES The Full Power Balanced 300cx and 350Mcx amplifiers need to be operated from a dedicated AC power line rated at a minimum of 15 amps. The Full Power Balanced 700cx, 750Mcx, 400cx, and 450Mcx amplifiers need to Krell Full Power Balanced X Series Power Amplifiers be operated from a dedicated AC power line rated at a minimum of 20 amps.
FIGURE 1 FULL POWER BALANCED STEREO AMPLIFIER FRONT PANEL 1 2 3 1 Power Stand-by LED 2 Bias LED 3 Power Button 6 4 5 6 4 Infrared Sensor 5 Krell CAST LED 6 Regulator LED Krell Full Powered Balanced X Series Power Amplifiers
FIGURE 2 FULL POWER BALANCED MONAURAL AMPLIFIER FRONT PANEL 7 8 9 7 Power Stand-by LED 8 Bias LED 9 Power Button Krell Full Powered Balanced X Series Power Amplifiers 10 11 12 10 Infrared Sensor 11 Krell CAST LED 12 Regulator LED 7
Front Panel Description The front panel accesses power on/stand-by and infrared sensor (remote control) functions. The power stand-by, bias, regulator, and Krell CAST LEDs, arranged in a triangle on the front panel above the power button, illuminate to indicate amplifier status.
FIGURE 3 FULL POWER BALANCED STEREO AMPLIFIER BACK PANEL 19 13 14 15 16 17 13 Left and Right Speaker Binding Posts 14 Krell CAST Inputs 15 Back Panel Power Breaker Switch Krell Full Powered Balanced X Series Power Amplifiers 18 16 14 13 19 16 Left and Right Balanced Inputs 17 Krell Link Out/In 18 AC Mains Power Cord 19 Handles 9
FIGURE 4 FULL POWER BALANCED MONAURAL AMPLIFIER BACK PANEL 20 21 22 20 Handle 21 Speaker Binding Posts 22 Krell CAST Input 23 Balanced Input 10 23 24 25 26 24 AC Mains Power Cord 25 Krell Link Out/In 26 Back Panel Power Breaker Switch Krell Full Powered Balanced X Series Power Amplifiers
Back Panel Description The back panel provides connections for all inputs and outputs, power on/off, and remote control links. The back panel also has handles that allow you to safely and easily move the amplifier.
Back Panel Description, continued FULL POWER BALANCED 750Mcx, 450Mcx, AND 350Mcx MONAURAL POWER AMPLIFIERS 24 AC Mains Power Cord All Full Power Balanced amplifiers are equipped with a permanently attached AC power cord. See Figure 4 on page 10 25 Krell Link Out/In Full Power Balanced amplifiers are equipped with Krell Link Remote out/in connectors that allow the remote control to operate a linked amplifier configuration. See Krell Link Connections, on page 13 for more information.
Connecting the Full Power Balanced Amplifier to Your System INPUT AND OUTPUT CONNECTIONS Krell recommends using its proprietary Krell CAST system for unparalleled sonic performance between the Full Power Balanced amplifiers and other CAST-equipped components and the KPS 25sc Krell Playback System. Full Power Balanced amplifiers also offer balanced operation.
Connecting, continued 4. Connect the other end of the MIDI cable to the Krell Link in connector on the next component. To link another component, connect a second MIDI cable to the Krell Link out connector on the back panel of the second component. Connect the remaining end of the MIDI cable to the Krell Link in connector on the back panel of a third component. 5. Link additional components, if desired, as described in Steps 3 and 4. The components are now ready for operation with Krell Link.
Amplifier Operation Full Power Balanced amplifiers are easy to install and operate. However, it is important to exercise care during operation, due to the amplifiers’ enormous power output. Switching between active sources (such as a CD player, tape monitor, or VCR) without muting the preamplifier output, or bumping or miscuing a source can generate large transients at low frequencies. Full Power Balanced amplifiers may generate enough power with these transients to damage loudspeakers.
Remote Control Operation Full Power Balanced amplifiers are compatible with the remote controls included with Krell preamplifiers, the Home Theater Standard 7.1, and the KPS 25sc Krell Playback System. Please contact your authorized Krell dealer, distributor, or Krell to purchase a remote control for Full Power Balanced amplifiers.
Amplifier Troubleshooting HOW TO TROUBLESHOOT SYSTEM NOISE 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 speakers. This often occurs when introducing a new component into a system.
If the course of action listed in the table below does not correct the situation, please contact your authorized Krell dealer, distributor, or Krell.
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 standby, using the front panel power button. This eliminates “cold start” degradations. The amplifier will operate at full performance within minutes. Q.
Warranty 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.
Return Authorization Procedure If you believe there is a problem with your component, please contact your dealer, distributor, or the Krell factory to discuss the problem before you return the component for repair. To expedite service, you may wish to complete and e-mail the Service Request Form in the Service Section of our website at: www.krellonline.com To contact the Krell Service Department TEL 203-799-9954 Monday-Friday 9:00 AM to 5:00 PM EST FAX 203-799-9796 E-MAIL service@krellonline.
Specifications Full Power Balanced 300cx, 400cx, 700cx Stereo Amplifiers FPB 300cx FPB 400cx FPB 700cx 20 Hz to 20 kHz +0 dB, -0.05 dB 20 Hz to 20 kHz +0 dB, -0.05 dB 20 Hz to 20 kHz +0 dB, -0.05 dB 0.1 Hz to 240 kHz +0 dB, -3 dB 0.1 Hz to 240 kHz +0 dB, -3 dB 0.1 Hz to 240 kHz +0 dB, -3 dB 113 dB 117 dB 120 dB GAIN 26.4 dB 26.4 dB 26.4 dB TOTAL HARMONIC DISTORTION (THD) 1 kHz <0.03% 20 kHz <0.16% 1 kHz <0.03% 20 kHz <0.16% 1 kHz <0.03% 20 kHz <0.
Specifications Full Power Balanced 350Mcx, 450Mcx, 750Mcx Monaural Amplifiers FPB 350Mc FPB 450Mc FPB 750Mc 20 Hz to 20 kHz +0 dB, -0.05 dB 20 Hz to 20 kHz +0 dB, -0.05 dB 20 Hz to 20 kHz +0 dB, -0.05 dB 0.1 Hz to 240 kHz +0 dB, -3 dB 0.1 Hz to 240 kHz +0 dB, -3 dB 0.1 Hz to 240 kHz +0 dB, -3 dB 114 dB 118 dB 121 dB GAIN 26.4 dB 26.4 dB 26.4 dB TOTAL HARMONIC DISTORTION (THD) 1 kHz <0.03% 20 kHz <0.16% 1 kHz <0.03% 20 kHz <0.16% 1 kHz <0.03% 20 kHz <0.
Krell Industries, Inc. 45 Connair Road Orange, CT 06477-3650 USA TEL 203-799-9954 FAX 203-891-2028 E-MAIL krell@krellonline.com WEB SITE http://www.krellonline.com Full Power Balanced X Series Power Amplifiers 700cx, 400cx, 300cx Stereo 750Mcx, 450Mcx, 350Mcx Monaural with Krell CAST II Technology v 02.
