Nad C 720 BEE Brochure

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NAD Electronics International reserves the right to change specifi cations or features without notice. NAD is a registered trademark of NAD Electronics International. All rights reserved. No part of this publication may be reproduced, stored, or tr ansmitted in any form whatsoever without the written permission of NAD Electronics International. © 12/04 NAD Electronics International. www.NADelectronics.com The C720BEE also incorporates NADs acclaimed switchable Soft Clipping circuit, which signifi cantly reduces the risk of damage to loudspeakers due to prolonged high power operation. Design: PowerDrive : NAD takes a stance to the overblown power ratings quoted by many competitors, which dont give a realistic indication of an amplifi ers true capabilities. NADs Full Disclosure Power ratings give the guaranteed minimum continuous power output under the worst case loading of 4 Ohms and 20Hz to 20kHz with both channels driven simultaneously, as well as the more meaningful in actual use dynamic power ratings. The C720BEE benefi ts from NADs proprietary PowerDrive topology, this further refi nement of Power Envelope and ISC, is now well established and used throughout the NAD product range. PowerDrive endows the C720BEE with tremendous dynamic power and low impedance drive capability, seemingly contradictory traits to be found in a single amplifi er. This is accomplished by using a multistage power supply with a very sophisticated analog computer determining whether to switch in a high voltage or a high current rail depending on the specifi c operating condition. This optimization is fully automatic and utterly transparent in operation; the result is that the C720BEE sounds far larger and more powerful than its continuous power rating would suggest. PowerDrive is a practical approach to enable an amplifi er to easily deal with musical dynamics and diffi cult speaker loads. Most impressive are the C720BEEs dynamic capabilities; up to 220 Watts into 2 ohms and up to 50 amps peak current capability! Performance: The C720BEE features many circuit refi nements trickled down from NADs award winning amplifi ers including active current sources and common base current followers in the power amp section. This dramatically reduces dynamic intermodulation distortion between music signal components in different frequency ranges, and between the music signals and the power supply ripple and distortion components. In measurement terms, both static and dynamic IM distortion are reduced by between 10dB to 20dB. (to between -90dB and - 100dB.) In audible terms this improves defi nition, purity and resolution, hence imaging. Compared to its predecessor the C740, we have improved the accuracy of the tone controls, increasing their boost/cut range by 1.5dB and have specifi ed a better quality volume control. While some of these are small improvements in and of themselves, there is an additive effect that results in a more refi ned and authoritative sound, building on the strengths of the already very good design of the C740 and making it the equal of the C320BEE. The sensible Tone Control characteristics, sonically transparent relay input switching, and Pure Class A modular preamp stages and power amp driver stages, are directly carried over from the C320BEE. So are the patented power amp output stages, unique low resistance binding post design, copper bus bars for high-current paths, and low-noise discrete regulators. Pre-Amp Section Line level inputs Input impedance (R+C) Input sensitivity, rated power Frequency response (-3dB - 70kHz)* Line level outputs Output impedance Record Out/Zone 2 Maximum output level Pre-Out Tone Controls Treble Base Remote Control Power Amp Section Continuous output power † Rated distortion (THD 20Hz-20kHz) Clipping power ‡ IHF dynamic headroom at 8Ω IHF dynamic power at 8Ω IHF dynamic power at 4Ω IHF dynamic power at 2Ω Damping factor (ref. 8Ω, 50Hz) Line level inputs Input impedance Input sensitivity (for rated power into 8Ω) Frequency response; 20Hz-20kHz Signal/noise ratio; ref 1W (A-weighted) Signal/noise ratio; ref rated power Tuner Section Usable input sensitivity; FM mono 50dB Quieting sensitivity; FM stereo Harmonic distortion; FM mono Harmonic distortion; FM stereo Signal/noise; mono Signal/noise; stereo Channel separation at 1kHz Frequency response; ± 1.5dB Physical Specifi cations Dimensions (W x H x D) Net Weight Shipping Weight 200kΩ / 320pF 220mV ±0.3dB 220Ω Source Z + 1kΩ Zone 2 out >10V >12V ±5dB at 10kHz ±5dB at 100Hz SR-5 / ZR-3 2nd Zone 50W (17dBW) 0.03% 68W (18dBW) 3.4dB 100W (20dBW) 145W (21.6dBW) 180W (22.5dBW) >60 20kΩ/ 470pF 630mV +/-0.3dB 100dB 117dB 16.1dBf 36.1dBf 0.25% 0.5% 60dB 55dB 40dB 30Hz - 15Hz 17 1/8 x 5 3/16 x 13 3/4 (435 x 132 x 350mm) 14.33 lbs (6.5kg) 16.98 lbs (7.7kg)