SPL Gemini

SPL Gemini

SPL Gemini

Starting from £2,125.00
  • Mid/side specific mastering processor
  • Balance control for mid signal positioning
  • Trim control for mid/side signal adjustment
  • Adjustable stereo width
  • Elliptical filter for lower frequency ratio cuts
  • Link with the SPL Hermes for even more routing and mastering options
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Gemini from SPL is an M/S mastering processor designed specifically for mid signals such as vocals, snare and bass, as well as side signals such as guitar, cymbals and more spatial signals.

Multiple Functionality

M/S coding is a perfect route not only to gaining access to individual elements in a mix within the sum signal, but also as a means to work on the stereo panorama.

Gemini boasts a range of powerful features adept at helping to achieve the perfect master. Balance control positions mid signals within the panorama, whilst trim controls adjust levels between mid and side signals. The mixing ratio for both stereo channels can be adjusted in connection with the stereo width controls, whilst the Gemini’s built-in elliptical filter cuts low-frequency ratios of the sideband as required.

Perfect Partners

SPL’s Gemini and Hermes processors can operate in their complete range of functions as stand-alone devices, however joining the two together enables even more possibilities.

Gemini’s encoder and decoder stages can be paired with inserts of Hermes to exactly specify the position of mid/side encoders and decoders within the processing chain. 

A popular configuration is to place mid/side encoder in position 3, EQ in position 4 and the decoder stage in position 5. This enables separate processing of mid and side signals before combining the two into a left/right stereo signal.

For additional dynamic processing, a compressor could also be added to position 5, moving the decoder stage to position 6.


Max Input Level:
+32.5 dBu
Input Impedance:
20 kOhms (bal.)
Max Output Level:
+32.5 dBu
Output Impedance:
‹ 100 Ohms (bal.)
-98.2 dBu (A-weighted)
› -110 dB @ +20dBu
Common Mode Rejection:
-79 dB @ 0 dBu
Transmission Bandwidth:
10 Hz-150 kHz


0.11 Amp, 230V/50Hz, 24W, 32 VA
0.5 Amp (230V/50Hz)

Physical Properties

482 x 44 x 300mm

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