Empirical Labs PUMP Classic Knee Compressor 500 Series Horizontal

Empirical Labs PUMP – 500 Series Compressor

The PUMP is a single-channel 500-series compressor that carries the unmistakable lineage of Empirical Labs’ most revered designs — including the Distressor, Arousor, and Mike-E. Built for professionals who demand uncompromising performance, the PUMP combines classic ELI innovation with modern flexibility, making it a true “go-to” processor for any serious rack.

Features:

• Input Level control with “BAD” clip indicator
• Eight selectable ratios from 2:1 to 20:1, each with its own compression curve
• Digitally stepped Attack and Release controls for precise, repeatable settings, including a smooth Opto-style Release option
• Switchable 110 Hz high-pass filter for tighter low-end control
• AtMod (Attack Modification) slows the onset of the attack envelope to preserve transients and enhance punch
• Comprehensive gain reduction metering for clear visual feedback
• Bypass mode for instant dry signal comparison

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.