Heritage Audio HA-609A | Diode-bridge Stereo Compressor/Limiter, Classic Bus Tone
The HA-609A inherits the classic diode-bridge dynamics circuit, integrating limiter and compressor into a single 19-inch rack unit to provide thick, tight, and musical dynamic control. The fully discrete Class A design and transformer-balanced I/O deliver the signature loose low end and smooth highs, ideal for precise shaping of drum buses, stereo masters, and mono tracks.
Key Product Features
- Two-stage dynamic processing with a diode-bridge architecture: limiter + compressor can operate simultaneously
- Fully discrete Class A design with transformer-balanced I/O, reproducing the classic British tonal thickness
- True stereo linking to maintain image stability and phase coherence
- Dual VU meters for clear monitoring of gain reduction and output level
- Detented control knobs for precise repeatability and quick recall
- Popular bus-compression character, balancing punch and cohesion
- High headroom, low-noise design, suitable for mastering and demanding recording situations
- Solid construction and built-in power supply for long-term reliable operation
Specifications
| Brand / Model | Heritage Audio HA-609A |
| Product type | Stereo / Dual-mono diode-bridge limiter + compressor |
| Circuit architecture | Fully discrete Class A, transformer-balanced inputs/outputs |
| Channel mode | Stereo linked or dual independent mono operation |
| Controls | Limiter: Threshold, Recovery; Compressor: Threshold, Ratio, Attack, Release, Make-up Gain; BYPASS/Link, Level/Reduction monitoring switch |
| Metering | Dual VU meters (selectable to display output level or gain reduction) |
| Audio connections | Balanced XLR inputs x2, balanced XLR outputs x2 |
| Rack format | 19-inch rackmount |
| Power | Internal universal power supply (100–240 V AC, 50/60 Hz) |
| Manufacture | Made in Spain |
