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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





Akai AA-1115 receiver

Stereo Receiver AA-1115

Outstanding performance is guaranteed from this elegantly designed slim high fidelity stereo receiver. Top grade circuitry, precise controls and multiple connections.

 

Quality Circuits for High Fidelity

A plus/minus power supply and differential semi-complementary OCL circuitry not only provides 15 watts per channel continous power output, minimum RMS at 8 ohms from 40 to 20,000 Hz with no more than 0,5% Total Harmonic Distortion, but also produces better phase characteristic and accounts for more low range frequency directivity. Top grade 3-stage direct coupled negative feedback equalizer circuit also in the amplifier section extends phono input, signal linearity to 110 mV (rms, 1 kHz) to assure wide dynamic range.

AA-1115 tuner section features PLL (Phase Locked Loop) MPX section to assure accurate and stable FM stereo separation of more than 40 dB, IC equipped FM-IF section features a built-in quadrature detector for excellent linearity and minimal distortion over an exceptionally wide frequency range and two-stage ceramic filter for better selectivity.

 

Elegant and Easy-to-Operate Design

The new lighting structure enables clear reading of linear dial scale and AM/FM tuning meter, and the enumerated bass, treble, balance and volume controls facilitate easy reference. Other features include a loudness switch for clearer low volume listening, a mode switch with FM muting circuit for quieter tuning, a tape monitor switch and push-button speaker switches for easier selection

 

Multiple Connections

Connections include Phono Jacks and two full speaker systems. Dubbing from a tape deck to a tape deck is possible using Aux and Tape Jacks. Tuning, preamplification and power amplification in one slim cabinet. Do them well with quality Akai receiver AA-1115.

 


Specifications

Power Output:  15 watts per channel (min. RMS, at 8 Ω , 40 - 20,000 Hz , with no more than 0,5% T.H.D.)

Power Bandwidth (IHF):  15 Hz to 40 kHz (T.H.D. 0,5% at 8 Ω )

Signal-to-Noise Ratio (IHF):

Phono :  better than 75 dB at 8 Ω

Aux :  better than 90 dB

Residual Noise:  less than 0,8 mV at 8 Ω

Channel Separation (IHF):

Phono :  better than 50 dB at 1 kHz

Damping Factor:  more than 30 (1 kHz, 8 Ω )

Output:

Speakers :  A, B (4 to 16 Ω ); A + B (8 to 16 Ω )

Headphones :  4 to 16 Ω

Input Sensitivity/Impedance:

Phono :  3 mV/47 k Ω

Aux :  150 mV/100 k Ω

Tape Monitor:

Input [PIN / DIN} :  150 mV/100 k Ω  / 150 mV/100 k Ω

Output [PIN / DIN} :  150 mv/100 k Ω  / 30 mv/180 k Ω

Frequency Response:

Phono (RIAA) :  30 Hz to 15 kHz ±1 dB

Aux, Tape, Monitor :  10 Hz to 70 kHz +0 -2 dB

Tone Control:

Bass :  ±9 dB at 100 Hz

Treble :  ±9 dB at 10 kHz

Loudness Control:  +10 dB at  100 Hz; +5 dB at 10 kHz (volume control set at -30 dB)

FM Tuner Section

Frequency Range:  88 MHz to 108 MHz

Sensitivity(IHF):  1,9 µV

Capture Ratio:  1,3 dB

Selectivity (IHF):  more than 60 dB

Image Rejection:  more than 65 dB (at 98 MHz)

IF Rejection:  more than 90 dB (at 98 MHz)

Spurious Rejection:  more than 90 dB (at 98 MHz)

AM Suppression:  50 dB

Signal-to-Noise Ratio:  65 dB

T.H.D.

Mono :  less than 0,3% (100% mod)

Stereo :  less than 0,6% (100% mod)

Stereo Separation:  more than 40 dB at 1 kHz

Subcarrier Suppression:  more than 52 dB

AM Tuner Section

Frequency Range:  520 kHz to 1605 kHz

Sensitivity (IHF):

Bar Antenna :  180 µV/m

External Antenna ;  10 µV

Selectivity (IHF):  more than 30 dB

Image Rejection:  more than 65 dB at 1 kHz

IF rejection:  more than 45 dB

Signal-to-Noise Ratio:  more than 45 dB

Tuning Indicator Meter:  FM Center Tuning/ AM Signal Strength Meter

Muting Level Control:  On (stereo)/Off (monaural) Switch

Antenna Input Impedance:  300 Ω  (balanced); 75 Ω  (unbalanced)

Miscellaneous

Semiconductors:  25 Transistors; 10 Diodes; 1 FET; 4 ICs

Power Requirement:  110/220/240 V switchable, 50/60 Hz

Dimensions (W x H x D):  480 x 128 x 268 mm (18,9" x 4,8" x 10,6")

Weight:  5,8 kg (12,8 lbs)