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note that this document contains the text from the original product brochure, and some technical statements may now be out of date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.
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PRE-AMP SECTION
Phono input
Input impedance (R and C)
Input sensitivity, (1kHz, ref. rated power)
Signal/Noise ratio (A-weighted with cartridge connected)
THD (20Hz - 20kHz)
47kΩ / 100pF
3.2mV
76dB ref. 5mV
<0.04%
RIAA response accuracy (20Hz - 20kHz)
0.5dB
Line level inputs
Input impedance (R and C)
Input sensitivity (ref. rated power)
Maximum input signal
Signal/Noise ratio (A-weighted ref 1W)
Frequency response (20Hz - 20kHz)
Infrasonic filter
15kΩ / 100pF
160mV
>10V
88dB
0.5dB
-3db at 15Hz, 24dB/octave
0.01%
THD
Line level outputs
Output impedance
Pre-amp 600Ω
Tape Source Z + 1kΩ
Phones 220Ω
12V
Maximum output level
Tape 8V
Phones >10V into 600Ω
>500mV into 8Ω
Tone controls
Treble
Bass
7dB at 10kHz
10dB at 50Hz
+3dB at 70Hz
+6dB at 40Hz
Bass EQ
POWER AMP SECTION
Continuous output power into 8Ω *
40W (16dBW)
0.03%
Rated distortion (THD 20Hz - 20kHz)
Clipping power (maximum continuous power per channel)
IHF Dynamic headroom at 8Ω
50W
+6dB
IHF dynamic power (maximum short term power per channel)
8Ω 160W (22dBW)
4Ω 200W (23dBW)
2Ω 250W (24dBW)
>50
Damping factor (ref. 8Ω, 50Hz)
Input impedance
Input sensitivity (for rated power into 8Ω)
Frequency response
22kΩ / 880pF
1V
6Hz - 50kHz +0, -3dB
ref. 1W 100dB
Signal/noise ratio
ref. rated power 116dB
<0.03%
THD (20Hz - 20kHz)
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FM TUNER SECTION
Input sensitivity
Mono -30dB THD+N 10.3dBf (1.8µV/300Ω)
Mono 30dB S/N 14.2dBf (2.8µV/300Ω)
Stereo 50dB S/N 36dBf (34µV/300Ω) FM NR off
29dBf (16µV/300Ω) FM NR on
Stereo 60dB S/N 46dBf (110µV/300Ω) FM NR off
40dBf (56µV/300Ω) FM NR on
Capture ratio (45 - 65dBf)
AM rejection (45 - 65dBf)
Selectivity, alternate channel
Image rejection
<1.5dB
>60dB
65dB
70dB
I F rejection
Harmonic distortion
90dB
Mono 0.09%
Stereo 0.09%
Mono >80dB
Stereo >75dB
30Hz - 15kHz
50dB
Signal/Noise ratio
Frequency response 0.5dB
Channel separation at 1kHz
AM TUNER SECTION
Usable sensitivity
Selectivity
Image rejection
I F rejection
Signal/Noise ratio
Harmonic distortion
300µV
35dB
50dB
35dB
45dB
0.5%
Remote
NAD Link
No
No
PHYSICAL SPECIFICATIONS
Dimensions (W x H x D)
Net weight
420 x 108 x 380mm
7.5kg
9.0kg
Shipping weight
Power consumption (120 ~ 240V, 50/60Hz)
240VA
* Minimum power per chnnel, 20Hz - 20kHz, both channels driven with no more than rated distiortion.
Dimensions are of unit’s cabinet without attached feet; add up to 18mm for total height.
Dimension depth excludes terminals, sockets, controls and buttons.
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