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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





NAD 7225PE receiver

 

NAD Stereo AM/FM Receiver, Features:

25 W RMS, power Envelope Technology

85 W Dynamic power

Soft Clipping

Pre-out/Main-in

Speaker impedance selector

5-way speaker binding posts

Glod-flashed Phono input jacks

 


Specifications:

Power  Section

 Continuous Average Power Output into 8 Ω (min. Powerper Channel, 20Hz-20kHz, both channel driven, with no more than rated distortion):    25 W (14 dBW)

Rated Distortion (THD 20Hz-20kHz) :  0.03%

Clipping Power (Maximum Continuous Power per Channel) :  40 W (8 Ω, 1 kHz)

IHF Dynamic Headroom (at 8Ω):  +4 dB

IHF Dynamic Power (Maximum Short Term Power per Channel)

60 W at 8 Ω (18 dBW)

85 W at 4 Ω (19 dBW)

90 W at 2 Ω (19,5 dBW)

Damping Factor (ref. 8Ω, 50Hz):  better than 50

Input Impedance:  20 kΩ / 820 pF

Input Sensitivity (for Rated Power into 8Ω) :  1 V

Frequency Response :  12 Hz - 45 kHz (+0, -3 dB)

Signal-to-Noise Ratio :  100 dB (ref. 1 W);  114 dB (ref. Rated Power)

Total Harmonic Distortion  (20Hz - 20kHz):  less than 0.03%

Pre-amp Section

Phono Input

Input Impedance (R / C) :  47 kΩ/100 pF

Input Sensitivity (1kHz) :   2,5 mV  (ref.  25 W )

Signal-to-Noise Ratio (A-weighted with cartridge connected) :  75  dB (ref. 5 mV )

Total Harmonic Distortion (20 Hz - 20 kHz) :  less than 0.04%

IM Distortion:  less than 0,04%

RIAA Response Accuracy (20 Hz - 20 kHz):  ±0.5 dB

Line Level inputs [Tuner, CD, Aux, Video, Tape]

Input Impedance (R / C) :  40 kΩ/100 pF

Input Sensitivity :  160 mV (ref.  25 W)

 Maximum Input Signal:   better than 10 V

Signal-to-Noise Ratio (A-weighted):  85 dB  (ref.  1 W);  99 dB  (ref.25 W)

Frequency Response:  20 Hz - 20,000 Hz (+0,5 dB -1,0 dB)

Infrasonic Filter:  -3 dB at 15 Hz, 24 dB/octave (fixed)

Line Level Outputs

Output Impedance

Pre-Out :  600 Ω

Tape Source:  Z + 1000 Ω

Phones :  220 Ω

Maximum Output Level :  12 V

Pre-Out :  10 V

Tape  :  better than 10 V into 600 Ω 

Phones :  better than 500 mV into 8 Ω

Tone Controls

Treble :  ±7 dB at 10 kHz

Bass : ±10 dB at 50 Hz

FM Tuner Section

 Input Sensitivity

Mono (-30 dB THD+N) :  11,3 dBf (2,0 µV/300Ω)

Mono (50 dB  S/N):  15 dBf (3,0 µV/300Ω)

Stereo (50 dB S/N):  37 dBf (40 µV/300Ω)

Stereo (60 dB S/N ):  47 dBf (120 µV/300Ω)

Capture Ratio (45 and 65 dBf):  less than 1,5 dB

 AM Rejection (45 and 65 dBf) :  better than 60 dB

Selectivity, Alternate Channel:   58 dB

Subcarrier Suppression (19 and 38 kHz)

Image Rejection:  70 dB

IF Rejection:  90 dB

Harmonic Distortion (100% mod.)

Mono (1 kHz):  0.1%

Stereo (1 kHz) :  0.1%

Signal-to-Noise Ratio (at 65 dBf, IHF weighted)

Mono :  better than 80 dB

Stereo :  better than 74 dB

Frequency Response:  30 Hz - 15 kHz  ±0,5 dB

Stereo Separation FM NR off (at 1 kHz):  45 dB

AM Tuner Section

 Usable Sensitivity:  5 µV

Selectivity:  30 dB

Image Rejection:  45 dB

IF Rejection:  35 dB

Signal-to-Noise ratio:  45 dB

Harmonic Distortion:  0.5%

General

Power Supply?/Cnsumption :  120 ~ 240 V, 50/60 Hz / 150 W

Dimensions (W x H x D):  420 x 91 x 273 mm

Net weight :  5,5 kg

Shipping weight :  6,8 kg

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