


Empirical Labs Inc Pump 500 Series Classic Knee Compressor Module
Empirical Labs Inc Pump 500 Series Classic Knee Compressor Module
Originally imagined in 2014, PUMP is a single channel, 500 series rack mount compressor loaded with the kinds of features and performance you’ve come to expect from Empirical Labs. This module has serious heritage and shares family DNA with notable ELI processors including the renowned Distressor, Arousor, and Mike-E. The PUMP is destined to be a “go-to” processor for the creative audio pro that has a toolbox built around no compromise performance, quality, and value.
Features
Starting at the top, PUMP includes controls for Input Level with a clip (BAD) indicator. There are 8 selectable compression ratios from 2:1 to 20:1 and everything in between, each with their own unique curve. Independent digitally-stepped knobs provide precise recall of Attack and Release selections – including a soft Opto-Coupler style Release. PUMP has a switchable 110Hz High Pass Filter, comprehensive Gain Reduction metering, Attack Modification (AtMod) to slow the initial onset of the attack envelope to preserve more transient content for greater overall impact – with a Bypass selection to go dry.
Attack Modification
One of the most unique features of PUMP is AtMod, short for Attack Modification. First seen is our Arousor plug-in, AtMod is a feature never before found in a hardware compressor.
AtMod gives users the ability to slow down the initial slope of the attack envelope to add just a little bit more of the transient back into the track. Whether it’s to get a little bit more snap on the snare track or more thump on the electric bass, the AtMod will let the transients through without losing your desired amount of compression.
Specifications
- Frequency Response – 5 Hz to 175 kHz (-3dB points).
- Dynamic Range – 125 dB from maximum output (.5%THD soft clipping) to minimum output. Noise floor with Output on 0 is typically – 101dBu.
- Distortion – between .0035% and 15% at 1KHz, depending on mode and settings.
- I/O – Maximum Input before hard clipping – +22dBm, “ Line In” mode. Maximum Output (Mix at 0) – +28.5dBm
- Impedance – 120k Ohm, Instrument In Mode, output impedance is less than 75 ohms. 20K input impedance in balanced Line in mode.
- Compressor Time Constants – Attack: 200µs to 40ms. Release: 50ms to 500ms, plus Opto setting. Stereo Linkable for stereo tracks.
- Detector HP Filter – Switchable, fixed at 110Hz
- Attack Modification (AtMod) – Slows the initial onset of the attack envelope allowing more transient back into the track.
- Saturation Soft Clipper – based on the same circuit found in the Mike-E CompSat section.
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When will my order be dispatched?
Orders are dispatched Tuesday, Wednesday via Courierpost. You will be sent an email confirmation with tracking details once your order is on its way to you. If you have any questions about your order, please email nigel@oceania-audio.co.nz or use the contact form on this website.
How long will it take for my order to be delivered?
Orders are usually delivered the day after they are shipped. Rural orders may take 1-2 extra days.
Why is my order taking longer than expected?
Sometimes we have to order stock in from our suppliers if we don’t have it on hand. Where there are delays or when products are on backorder, this will always be indicated on the product page.
How much is shipping?
Shipping is free within New Zealand and dispatched with Courier Post.
Can I pick up my order?
Orders are shipped from our warehouse. If you would like to pick your order up, please arrange with us prior to placing your order. Email nigel@oceania-audio.co.nz or contact us using the contact form on this website.
What if my order was wrong?
If your order was incorrect or faulty in any way, please let us know and we will make sure you get what you ordered.
What is your refund policy?
You can find out more about our refund policy.
NZ Delivery
We like to keep things simple... Shipping is always FREE within New Zealand.
Our shipping days are Tuesdays and Wednesdays.
All packages are sent out of Auckland, New Zealand.
Please allow up to 7 working days for your package to arrive before contacting us. Although we strive to have them arrive in 1-3 working days with rural, public holidays, weekends, or unforeseen circumstances, this can take longer, depending on the shipping option, location and payment option you chose.
Once your order has been dispatched, you will receive a confirmation email with tracking details.
Please note: orders containing personalised or customised items may require additional processing time. Any extended timeframes will be clearly communicated at checkout or in your order confirmation.
Shipping Rates
Shipping is always FREE within New Zealand.
P.O. Boxes
We are currently unable to ship to P.O. Boxes. If a P.O. Box address is given by mistake we will contact you and this may cause a delay with the delivery of your package.
International Delivery
We don't currently ship outside of New Zealand, but if you aren't in New Zealand and see something you like, email sales@oceania-audio.co.nz and we will try to help you out.
Damaged, Lost or Missing Orders
If your order arrives damaged, incorrect, or is missing items, please contact us within 48 hours of delivery at sales@oceania-audio.co.nz with:
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Your order number
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Clear photos of the item and packaging
We will review each case individually and work towards a fair resolution in line with New Zealand Consumer Guarantees Act obligations.
Contact Us
If you have any questions about shipping, delivery, or your order, please contact:
sales@oceania-audio.co.nz
Questions? Spot a better price?
Call +64 9 845 7800 or Contact us

