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Low-Cut filter : 80 Hz (24dB/oct) – modifiable
Low frequency band : 30 Hz to 450 Hz – Bell or Shelf mode
Low Mid frequency band : 0.15kHz to 2 kHz – full Q Adjust (Maximum Gain Changes with Q Settings)
High Mid frequency band : 0.6kHz to 9kHz – 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


Here are some listening samples

Soundcloud SLQ51X Comparison Test


Build Guide

All our Build Guides


GDIY Help Thread
GDIY Help Thread

SLQ51X Black

PriceFrom €284.84
Excluding Sales Tax
  • The SLQ51X Black is a must-have for audiophiles looking for a program equalizer that delivers on both flexibility and precision. This EQ is designed in the 500 API format and based on the classic E242 equalizer, offering a rare and unique sound that's difficult to replicate. With +/-18dB of loudness and gain changes based on Q-settings, the Black EQ is perfect for fine-tuning your audio to your exact specifications. Whether you're a professional sound engineer or a DIY audio enthusiast, the SLQ51X Black is a top choice for any setup.

    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

    Assembled Units can be REV.A and REV.B


    • 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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