The Orban 290RX Adaptive Enhancement Processor was an interesting product that was on one hand a sound restoration device, and on the other a noise reduction system.
The Yamaha SPX900 is a highly sophisticated digital reverberation and effects system which offers 50 preset effect programs inciuding accurate simulations of natural reverberation and early-reflections, delay and echo effects, gated effects, modulation effects, a versatile compressor, a harmonic exciter, multiple effects which function as several Yamaha SPX900 units in one, freeze (sampling) programs and others.
With a sampling frequency of 44.1 kHz, it delivers full, ﬂat frequency response from 20 Hz to 20 kHz for exceptionally clean, “transparent” effect sound. The preset effect programs can be edited, re-titled, and stored in any of 49 RAM user memory locations.
Individual two-band parametric EQ and dynamic filter parameters are provided for each effect program for precise tonal tailoring. In addition to the basic effect and EQ parameters, the Yamaha SPX900 offers a list of “internal parameters” which provide exacting control over the effect sound.
The SPX900 is also MIDI compatible, with a MIDI in terminal that allows MIDI selection of effect programs, and a switchable MIDI THRU/OUT terminal. When switched to OUT, edited programs stored in internal RAM can be dumped to a MIDI data recorder or other data storage device. Programs thus stored can be reloaded when necessary via the MIDI in terminal.
As an extra touch of convenience the Yamaha SPX900’s input and output terminals can be switched to match -20 dBm or +4 dBm line levels + providing compatibility with a broader range of sound equipment.
Lots of effects and up to 5 simultaneous with some algorithms. You still see these for sale in excellent, working condition highlighting the superb build quality and reliability of these units at 30 years old. It’s a professional unit for professional applications though has been superseded by so many other modern equivalents that have been based on this original format and design. Even with its age, it still holds its own and is still a sought after vintage effects processor.
Quantization: 16 Bit
Sampling Frequency: 44.1kHz
Frequency Response: 20Hz-20kHz
Dynamic Range: 90dB
THD: Below 0.03%