Pioneer SX-450

 Medium-Power Stereo receiver with FET FM Front End, PLL MPX, Precision Equalizer and High S/N Differential OCL Power Amplifier.

 Can your musical needs truly be met by a stereo receiver with as little RMS power output as 15 watts per channel? They can if you put your trust in the Pioneer SX-450. if your listening room is of average size, if your budget is modest, and if clean, low-distortion musical reproduction is your goal, the SX-450 is the medum-powered stereo receiver for you. Its solid stereo FM/AM section includes a PLL multiplex IC for wide and stable stereo FM separation. There's a low-noise FET coupled with a frequency-linear 3-gang variable capacitor to increase FM sensitivity, a 5-stage limiter to eliminate AM noise, and a special integrated circuit to improve AM tonal Quality. The phono equalizer features a big low 0,1% distortion, and the tone control section is of the CR type to permit super-quiet handling of all tonal adjustments.

Continuous power output of 15 watts min. RMS, at 8 ohms, 20 to 20,000 Hz  with no more than 0,5% total harmonic distortion. All things considered, this is an unusually good buy in stereo - the SX-450 from Pioneer.

Specifications

Power Amplifier Section

Continuous Power Output (both channel driven, 20-20,000Hz): 15 watts per channel at 8 Ω

Total Harmonic Distortion (20 Hz to 20 kHz, from Aux)

Continuous Rated Power Output:  no more than 0,5%

1 watt per channel output, 8 Ω:  no more than 0,1%

Intermodulation Distortion (50 Hz : 7 kHz = 4:1 from Aux)

Continuous Rated Power Output:  no more than 0,5%

1 watt per channel output, 8 Ω:  no more than 0,1%

Damping Factor (20 Hz-20 kHz):  25

Input Sensitivity/Impedance

Phono : 2,5 mV/50 k Ω

Mic : 7,5 mV/50 k Ω

Aux : 150 mV/50 k Ω

Tape Play : 150 mV/50 k Ω

Tape Play (DIN) : 150 mV/50 k Ω

Phono Overload level (THD 0,1%):  150 mV (1 kHz)

Output Level/Impedance

Tape Rec : 150 mV

Tape Rec (DIN) : 30 mV/80 k Ω

Speaker : A, B, A+B

Headphone : Low Impedance

Frequency Response:

Phone (RIAA equalization) : 30 Hz to 15,000 Hz +0,5 -1 dB

Aux, Tape Play : 20 Hz to 60,000 Hz ±1 dB

Tone Control

Bass : +10 dB, -9 dB (at 100 Hz)

Treble : +9 dB, -10 dB (at 10 kHz)

Loudness Contur (Volume Control at -40 dB):  +6 dB (100 Hz); +3 dB (10 kHz)

Hum and Noise (IHF, short-circuited, A network, rated power)

Phono : 70 dB

Aux, Tape Play : 90 dB

FM Section

Usable Sensitivity [Mono/Stereo]:  11,2 dBf (2,0 µV) / 20,0 dBf (5,5 µV)

50 dB Quieting Sensitivity [Mono/Stereo]:  18,3 dBf/(4,5 µV) / 39,2 dBf (50 µV)

Signal-to-Noise Ratio at 65 dBf [Mono/Stereo]:  70 dB/ 65 dB

Distortion at 65 dBf

100 Hz [Mono/Stereo] : 0,15% / 0,3%

1 kHz [Mono/Stereo] : 0,15% / 0,3%

6 kHz [Mono/Stereo] : 0,4% / 0,4%

Frequency Response:  30 Hz to 15,000 Hz  +0,2 -2,0 dB

Capture Ratio:  1,0 dB

Alternate Channel Selectivity:  60 dB

Spurious response Ratio:  75 dB

Image response Ratio:  65 dB

IF Response ratio:  85 dB

AM Suppression ratio:  50 dB

Muting Threshold:  14 dBf (2,8 µV)

Stereo Separation:  40 dB (1 kHz), 30 dB (30 Hz - 15 kHz)

Subcarrier Product ratio:  40 dB

SCA Rejection Ratio:  40 dB

Antenna Input:  300 ohms balanced / 75 ohms unbalanced

AM Section

Sensitivity IHF [ferrite /external antenna]:  300 µV/m  / 15 µV

Selectivity:  35 dB

Signal-to-Noise Ratio:  50 dB

Image Rejection:  40 dB

IF rejection:  65 dB

Antenna:  Built-in Ferite Loopstick Antenna

Miscellaneous

Semiconductors:  1 FET; 3 ICs; 28 Transistors; 15 Diodes

Power Requirements:  110 -120 V, 220-240 V,  50/60 Hz

Power Consumption:  UL; 70 W, 130 W (max); CSA; 120 VA

Dimensions (W x H x D):  448 x 141 x 307 mm (17-4/8 x 5-9/16 x 12-1/16 inches)

Weight:  8,6 kg (19 lb) net