Building Gyraf GSSL 4000

March 14, 2023

Projekt by Jacob Erland

12 men, 2 ½ day, coffee, pizza, no sleep= 12 x GSSL.

We met 12 men in a class room over a week-end to build 13 GSSL 4000 units. We drank coffee, ate pizza and breathed soldering steam.

Working GSSL4000

Working hard.

Working on GSSL 400

Concentration.

Soldering GSSL 4000

Silence.

GSSL 4000 Inside

Engine Room.

GSSL Back

Backside.

GSSL4000

Gyraf GSSL 4000 Exhibit.

11 gssl4000

Gear is beautiful.

13 units GSSL 4000

King, Red, Me, Radmager, Uncite, Mr. Mystery, Hjort, X, Jens, Michael, Smiley & Pirate.

The GSSL 4000 is a popular master bus compressor designed by Jakob Erland, a Danish engineer and designer known for his high-quality audio equipment. The GSSL 4000 is a stereo compressor that is based on the SSL G-Series console compressor, which is renowned for its smooth and transparent sound.

The GSSL 4000 is built around a number of high-quality components, including THAT Corporation 2180 VCA chips, NE5532 & NE5534 op-amps, and an the same for the sidechain. The unit features a simple and intuitive interface, with controls for threshold, ratio, attack, release, and makeup gain.

One of the unique features of the GSSL 4000 is its use of a diode bridge as the gain reduction element. This design is similar to the SSL G-Series console compressor, and provides a smooth and transparent sound that is particularly well-suited for mastering applications. The diode bridge also allows for a high degree of control over the attack and release characteristics of the compressor, making it easy to dial in the perfect settings for any mix.

Another key feature of the GSSL 4000 is its use of a high-pass filter in the sidechain. This filter can be used to prevent low-frequency content from triggering the compressor, which can be particularly useful in situations where the mix has a lot of low-end energy. The filter is switchable between 80 Hz and 120 Hz, and can be bypassed completely if desired.

The GSSL 4000 also features a number of other useful controls, including a soft/hard knee switch that allows you to choose between a gentle, gradual compression curve or a more aggressive, immediate curve. There is also a stereo link switch that allows you to link the two channels together for more precise stereo imaging.

Overall, the GSSL 4000 is a highly regarded master bus compressor that offers a smooth and transparent sound, along with a number of useful features and controls. Its build quality and components are of a high standard, and it has gained a reputation as a reliable and effective tool for mastering engineers looking to add the final touch to their mixes.

Gyraf GSSL 4000 DIY – Over and out!

More information www.groupdiy.dk

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