Pioneer PRO 8

A Dolby Pro Logic and digital sound field processor with 16 built-in sound fields and independent 4-channel D/A conversion.

Overview

The Pioneer PRO 8, officially the SP-700D, is a digital sound field processor. It uses computer modeling to simulate acoustic environments. It has 8 surround modes, including Dolby Pro Logic Surround, and a digital equalizer with parameter adjustment. The integrated early reflection system (I·E·R·S) takes into account the frequency characteristics of real room surfaces, so the unit can recreate concert-hall acoustics.

The stereo signal path stays complete from input to output. The analog and digital sections get separate power supply circuits to keep interference down. The included CU-SP002 remote handles control.

Specifications

Original price	¥89,800 (around 1990)
Input Sensitivity / Impedance	Line : 63mV/68k Ω
Output Level / Impedance	Line : 316mV/5.4k Ω Headphone : 0.25mW/8 ohm
A/D converter	16bit, Sampling frequency: 48 kHz
D/A converter	16-bit, 4-channel independent
Digital filter	4 x oversampling digital filter
Frequency characteristic	Processing Front, Rear : 20 Hz to 20 kHz +0 -3dB
Distortion Factor (1 kHz)	Processing Front, Rear : 0.008%
THD	0.03%
S/N ratio (S = 2 Vrms)	Processing Front, Rear : 90 dB
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	26W
External dimensions	Width 420 x Height 85 x Depth 335 mm
Weight	5.2kg
Attachment	Remote Controller CU-SP002
Equipped with	7-row motor drive volume

Design

The PRO 8 models real sound fields with its own computer simulation method, processed through a 50-bit DSP. The integrated early reflection system (I·E·R·S) reproduces reflections similar to those in actual concert venues. The analog and digital power supplies are fully separated. A 7-row motor drive volume control handles the signal level.