NAD 7240PE brochure Power Envelope design, High-currentoutput stage, Impedance selector

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note that this document contains the text from the original product brochure, and some technical statements may now be out of date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.