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Low-Cut filter : 80 Hz (24dB/oct) – modifiable
Low frequency band : 45 Hz to 450 Hz – Bell or Shelf mode
Low Mid frequency band : 0.2kHz to 2 kHz – full Q Adjust (Maximum Gain Changes with Q Settings)
High Mid frequency band : 0.6kHz to 6kHz – full Q Adjust (Maximum Gain Changes with Q Settings)
High frequency band : 1.4kHz to 16kHz – Bell or Shelf mode
High-Cut filter : 8 kHz (24dB/oct) – modifiable


Maximum 18 dB of boost/cut gain per band (center detent)

High quality pots (TT Electronics and Alps Alpine)

THAT 1246 In- and THAT 1646 Outputstages


Its running on +16V/-16V in the 500 API Standard/ VPR Rack or in the GDIY 51X Rack


Final Product may vary a little from the pictures


Here are some listening samples

Soundcloud SLQ51X Comparison Test


Build Guide

Build Guide


GDIY Help Thread
GDIY Help Thread

SLQ51X Orange

PriceFrom €284.84
Excluding Sales Tax
  • Introducing the SLQ51X Orange, a Program Equalizer in 500 API Format that is perfect for any audio DIY enthusiast. Based on the classic styled 4000 Orange (E132) Equalizer, this product is designed to deliver high-quality sound with a vintage touch. The SLQ51X Orange is believed to have been developed to mimic the famous Pultec EQs Curves, making it a great addition to any studio setup. With its sleek design and excellent performance, the SLQ51X Orange is the perfect choice for anyone looking for a top-notch program equalizer.

    Very Flexible and very precise calibration for all needs. We added to this 4 Band Equalizer a Low and High Cut Filter to make it more flexible in Mixing or Recording situations.

    Improved Build - Easy Final Assembly and Testpoints

    • Shipping will be calculated depending on your location
    • Standard Shipping with DHL
    • UPS Express Saver as Option in Checkout
    • Free Standard Shipping in Europe on orders over 100€

    Return of untouched Original Products is possible during a time of 14 days after receiving your article, check our Return Policy

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