NAD 7240PE User Manual

7240PE Stereo Receiver
Date of manufacture : ? - Nov 89
Please note that this document contains the text from the original product brochure, and some technical statements may now be out of date
The 7240PE receiver consists of the 3240PE integrated amplifier, with its vast reserves of clean, solid
power for the the wide dynamic range of modern recordings, plus an exceptionally sensitive digital
tuner.
Power Envelope design
While the 7240PE is rated at 40 watts/channel of steady-state power, its +6 dB of IHF dynamic
headroom means that its dynamic power for musical transients exceeds 160 watts/channel at 8 ohms
and 200 watts/channel at 4 or 2 ohms. Even with long 200-millisecond tone-bursts, representing the full
duration of musical notes and chords, the 7240PE produces an impressive 100 watts per channel.
High-current output stage
The 7240PE de-livers up to 25 amperes per channel to ensure precise electromagnetic control of the
speaker’s voice-coil, even with impedances as low as 2 ohms.
Impedance selector
This rear-panel switch lets you optimise the amplifier’? operation to drive either low impedances (2 to 6
ohms) or a single set of speakers with a true 8-ohm (or higher) impedance.
Soft Clipping™
When the amplifier is driven beyond its rated power, NAD’s famous Soft Clip-ping™ M circuit gently
limits the waveform and prevents the harshness that occurs in other receivers when the output
transistors arc driven into saturation.
Low-noise phono preamplifier
NAD’s phono pre-amp circuits feature accurate RIAA equalisation, correct interfacing with the complex
impedance of the phono cartridge, very low noise and plenty of headroom to accommodate the
highest-level peaks without distortion.
Digital-ready inputs
With overload-proof line inputs and low-noise circuits for volume and tone control, the 724OPE
accommodates a dynamic range greater than 100 dB, preserving the transparent clarity of the finest
analogue and digital recordings.
Bass EQ with infrasonic filtering
The equalisation circuit boosts the deepest bass by 6 d B providing the sort of authentic bass “feel” that
might otherwise require a costly separate subwoofer system. At the same time, a sharp infrasonic filter
prevents excessive woofer-cone motion and minimises the bass-muddying effect of turntable rumble,
warps and tone arm/stylus resonances.
Musically Effective Tone Controls
Ordinary bass and treble control circuits intrude on the midrange; boosting the bass, for instance, makes
vocals thick and boomy. In NAD receivers, the bass and treble controls do what their names imply: they
vary the strength of the bass (the solid foundation, the musical beat) and the treble (the crisp detail the
airy brilliance) while preserving a neutral, accurate midrange response.

NAD 7240PE Specifications

General

Total Harmonic Distortion	0.03%
Frequency Response	20Hz to 20kHz
Damping Factor	50
Input Sensitivity	2.5mV (MM), 150mV (line)
Power Output	40 watts per channel
Speaker Load Impedance	4Ω to 16Ω
Channel Separation	50dB (line)

Summary

NAD 7240PE Stereo Receiver Features

Power Envelope Design

Explains dynamic power exceeding rated power for transients, up to 160W/200W at 8/4/2 ohms.

High-Current Output Stage

Delivers up to 25 amperes per channel for precise voice-coil control, even with 2-ohm loads.

Impedance Selector

Rear-panel switch to optimize amplifier operation for low (2-6 ohm) or high (8-ohm) impedance speakers.

Soft Clipping

Gently limits waveform beyond rated power to prevent harshness from output transistor saturation.

Low-Noise Phono Preamplifier

Features accurate RIAA equalization, low noise, and high headroom for distortion-free peak handling.

Digital-Ready Inputs

Overload-proof line inputs and low-noise circuits handle dynamic range >100dB for analogue and digital recordings.

Bass EQ with Infrasonic Filtering

Boosts deep bass by 6dB and filters infrasonic frequencies to prevent woofer motion and rumble.

Musically Effective Tone Controls

Bass/treble controls adjust strength without affecting midrange, preserving neutral response.

Digital Tuning and Design Philosophy

Precise Digital Tuning

Describes sensitive front-end, linear-phase IF circuit, quadrature detector, and PLL multiplex decoder for sharp selectivity.

FM Noise Reduction

Unique noise-reduction circuit eliminates noise/distortion in weak FM stereo signals, needing half signal strength for good quieting.

Technical Specifications

Pre-Amp Section

Details input impedance, sensitivity, signal/noise ratio, THD, RIAA accuracy, and tone control ranges.

Power Amp Section

Lists continuous power, clipping power, IHF dynamic power, damping factor, input impedance, frequency response, and S/N ratio.

FM Tuner Section

Provides input sensitivity, capture ratio, AM rejection, selectivity, image/IF rejection, distortion, S/N ratio, frequency response, and channel separation.

AM Tuner Section

Details usable sensitivity, selectivity, image/IF rejection, signal/noise ratio, and harmonic distortion.

Physical Specifications

Lists dimensions, net weight, shipping weight, and power consumption.