Vintage Bellari RP583 Dual Tube Compressor Limiter - Studio Tube Compressor / Limiter (2-Channel) Like New, in excellent condition from 1997!!! Always in smoke free recording studio. If you’re looking for a dual-channel compressor with character, especially for vocals, guitars, drum bus or even stereo bus use, the Bellari RP583 offers classic analog warmth and hands-on control at a more accessible price than many high-end tube bus compressors. Reviewers note its “smooth, lively tube sound” and versatility. Key features: Tube-based gain circuitry (one 7025 tube per channel) for rich, full-bodied tone Optical gain reduction element (photo-resistor/LED cell) for smooth compression character Independent controls per channel: Threshold, Ratio (2:1 up to hard limiting), Attack (0.5 ms to 100 ms), Release (0.1 s to 2 s), Output Level Balanced XLR and unbalanced ¼″ I/O on each channel + side-chain input/output jacks for external processing Switchable Stereo Link mode (channels can be linked for stereo bus use) Frequency response 20 Hz–40 kHz, input impedance 10 kΩ balanced / 1 MΩ unbalanced, THD+N < 0.1% typical, S/N ~90 dB Build: Rack-mount 2U form, solid build, tube design