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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





Denon DRA-550 receiver

A blend of convenience and performance for the Age of Digital Audio; Denon's Powerful DRA-550 Receiver

The DRA-550 combines the convenience of tuner/amplifier integration with the high performance of separate components. It easily handles the demanding dynamics of today's digital and hi-fi video sources through the extensive use of highly advanced circuitry in the amplifier section. The tuning section outperforms many separate tuners in both sensitivity and fidelity. The DRA-550 redefines what audiophiles have come to expect from a receiver.

Specifications

Amplifier Section

Continuous Power Output :  30 =50 W at 8 Ω (IEC65; Temperature limit output)

Power Bandwidth (IHF):  5 Hz - 40,000 Hz (T.H.D. 0,05% both channel driven at 8 Ω )

Total Harmonic Distortion (20 Hz to 20 kHz):  0,0095% (-3 dB power into 8 Ω )

Damping Factor:  more than 80 (at 1 kHz, 8 Ω )

Frequency Response:

Phono MM :  20 - 20,000 Hz ±0,5 dB  (RIAA Standard Curve)rec Out

Phono MC :  50 Hz - 20,000 Hz ±0,5 dB

Tape, Video, DAD :  20 - 50,000 Hz ±1,5 dB

Input Sensitivity/Impedance

Phono MM :  2,5 mV/47 k Ω 

Phono MC :  0,25 mV/ 100 Ω 

Tape, Video, DAD :  150 mV/33 k Ω 

Maximum Input Level (at 1 kHz)

Phono MM :  150 mV

Phono MC :  15 mV

Signal-to-Noise Ratio (IHF-A):

Phono MM :  5,0 mV (Input 86 dB)

Phono MC :  0,5 mV (Input 86 dB)

Tape, Video,DAD :  95 dB

Tone Controls:

Bass :  ±8 dB at 100 Hz

Treble :  ±8 dB at 10 kHz

Loudness :  Variable 50 Hz/10 kHz +10 dB/+5 dB

Subsonic Filter :  15 Hz -6 dB/oct

FM Tuner Section

Receiving Range:  87,5 - 108 MHz

Usable Sensitivity:  1,0 µV (11,2 dBf)

50 dB Quieting Sensitivity:

Mono :  2,0 µV (17,2 dBf)

Stereo :  23 µV (38,5 dBf)

Signal-to-Noise Ratio

Mono :  82 dB

Stereo :  80 dB

Total Harmonic Distortion

Mono :  0,1% at 1 kHz

Stereo :  0,3% at 1 kHz

Capture Ratio:  1,5 dB

Image Rejection:  75 dB

AM Suppression:  60 dB

Selectivity:  70 dB

Frequency Response;  30 Hz - 15 kHz +0,2/-1,5 dB

Stereo Separation:  45 dB at 1 kHz

AM Tuner Section

Receiving Range:  520 - 1611 kHz

Usable Sensitivity:  18 µV

Signal-to-Noise Ratio:  55 dB

General:

Power Supply:  AC 220, 240 V 50/60 Hz

Power Consumption:  100 W

Dimensions (W x H x D):  434 x 112 x 400 mm (17-3/32" x 4-13/32" x 15-3/4")

Weight:  7,9 kg (17 lbs 6 oz)

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