Pioneer - SR-9 - Reverberation Solid state stereo amplifier

The Pioneer SR‑9 is a dedicated stereo reverberation amplifier, manufactured in the early 1980s, designed to add depth and ambiance to the audio signal of hi‑fi systems. It is a sound processor that expands the listening experience, allowing different acoustic spaces to be simulated—from small rooms to large auditoriums.

User manual copy included.
Revised by a specialist technician.

Sound Functions and Processing

Adjustable reverberation: reverberation time control from 0 to 3 seconds in Echo mode — ideal for adding a broader “ambience” to the music.

Duet mode: by pulling the same control, creates a “duet” effect, where a solo signal can sound as if performed by two sources.

Display Time/Depth: a dynamic visual indicator that graphically represents reverberation time and depth — useful both aesthetically and functionally.

Sound Data (Electrical and Audio Specifications)

Frequency response range: 5 Hz – 70 kHz (well above the standard audible range, ensuring signal integrity without premature truncation).
Input sensitivity: 150 mV — compatible with common hi‑fi lines.
Output level: 150 mV.
Total Harmonic Distortion (THD): < 0.05%, indicating very low distortion added to the signal.
Signal-to-noise ratio: ~90 dB — good separation between the musical signal and background noise.

Physical Construction and Connectivity

Dimensions (L × H × D): approx. 420 × 99 × 336 mm — standard rack‑mountable hi‑fi component size.
Weight: about 4.3 kg, with a robust metal build and a classic front panel from the era.
Inputs/Outputs: dedicated stereo RCA connectors for reverberation (in and out), in addition to connections for recording/rec.

Functional visual effect: front panel with LEDs indicating time/depth that “pulse” in step with the decay speed of the effect.

Electrical power: operates on standard 220 V AC.

To deliver this product properly, it is carefully packed in very sturdy boxes, wrapped in bubble wrap with ample filling material. We primarily use plastic as the filling material, but if you prefer another material, please contact us. The package will be shipped with insurance to protect both the buyer and the seller. For special packaging requests, please send a message after purchase. Photos serve as an additional description of the product condition / display and LEDs. Please examine them carefully before purchase. Orders to remote islands or special destinations, such as the Canary Islands, will incur higher shipping costs.”