Heritage Audio 609A Elite Stereo/Dual Mono Compressor Limiter

The HA-609A is a modern take on the classic transformer coupled diode bridge compressor/limiter design, with several improvements added to accommodate the modern workflow. While some classic iterations of this design utilized IC chips and a Class A/B amplifier stage, the HA-609A features an entirely discrete, Class A design and a total of three Carnhill St Ives transformers per channel.

The addition of a fast attack mode for both the compressor and limiter section allows the HA-609A the flexibility to handle individual tracks as well as groups and 2-bus program material. Thanks to a proprietary system of diode bridge gain reduction cells, first introduced with the highly regarded SUCCESSOR, the HA-609A has better channel matching than any earlier incarnations; while the use of rotary switches and high quality, stepped pots allow for easy recall and maintain a perfect stereo image.

Specifications:

- Maximum input level: Over +22 dBu.
- Maximum output level: Over +26.5 dBu into 600 Ω.
- Self-Noise: Less than -75 dBu 20 Hz-20 Khz. -80 dBu A-weighted.
- THD+N (50 Hz- 20 kHz): not engaged, less than 0.07 % at +20 dBu.
- Frequency response, COMPRESS and LIMIT OUT, ±0.5 dB, 15 Hz- 30 kHz.
- Input impedance: 10 kΩ, transformer balanced and floating.
- Output impedance: Less than 75 Ω, transformer balanced and floating, Class A driven.
- Compressor characteristics: Threshold from ±20 dBu on a 41-step precision potentiometer. Ratio selectable on a rotary switch, 1.5:1, 2:1, 3:1, 4:1, 6:1. Release selectable on a rotary switch, 100, 400, 800, 1500 ms, A1 and A2 auto release times. A1 corresponds to 50 ms on peaks and around 500mS on sustained program. A2 to 50 ms on peaks and 1.5 seconds on sustained program.
- Limiter characteristics: Limit level selectable from 0 to +20 dBu on a 41-step precision potentiometer. Release selectable on a rotary switch, 50, 100, 200, 800 mS, A1 and A2 auto release times. A1 corresponds to 50 mS on peaks and around 800mS on sustained program. A2 to 50 ms on peaks and 1.5 seconds on sustained program.

US and EU parcels ship via UPS, ETA 1-7 working days from pickup day zero. That also applies to most locations worldwide.

All shipments are fully insured.

Bigger shipments requiring pallets or custom made crates ship to US, CA, JP, CN, AU and other outside of EU locations via DHL Air Freight, ETA is normally approx. 7-14 working days from pickup day zero.

Big shipments inside EU ship via different freight companies, recently mostly via ACE Logistics. Freight forwarders can use different courier companies for deliveries to final destinations.

Palletising and crating time can vary depending on the size of the shipment and packaging queue. We pack all our shipments with great care.

You are most welcome to pick your order up yourself from our Retrosonic Pro Audio showroom, studio and warehouse in Tallinn, Estonia.

We ship worldwide – contact us for a personal shipping quote or any other questions.

VAT (Value Added Tax) can be deducted if you have a company with a valid EU VAT number or if you're based outside of the EU. Non-EU buyers pay all and any import tax and duty as regulated by their local customs.