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SPL Gemini Mastering M/S Processor - Red , $2,999.00 - Add to Cart Skip to Product Information

SPL Gemini Mastering M/S Processor - Red

Mastering M-S Processor with Balance, Stereo Width, and Elliptical Filter Controls and 120V Rail Technology - Red
Item ID: GeminiRd
SPL Gemini Mastering M/S Processor - Red
We Can Get It Fast!

While this isn't an item we normally stock, we can still get it to you as fast as possible due to our great relationship with SPL. Go ahead and place your order and we'll follow up shortly to let you know when to expect it. Estimated October 12, 2026

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SPL Gemini Mastering M/S Processor - Red
We Can Get It Fast!

While this isn't an item we normally stock, we can still get it to you as fast as possible due to our great relationship with SPL. Go ahead and place your order and we'll follow up shortly to let you know when to expect it. Estimated October 12, 2026

World-class M-S Processor for Mastering

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Our Product Research Team

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The SPL Gemini is a mid-side processing unit that leverages SPL’s proprietary 120V Rail Technology for superior performance. Optimized for mastering, Gemini provides M-S encoding and decoding, giving you a surprising amount of flexibility to access individual elements within a stereo mix. For example, Gemini can separate mid signals such as kick, snare, bass, or lead vocals from side signals like guitars, keyboards, and cymbals. Mastering engineers at Sweetwater Studios are highly impressed with the SPL Gemini. You will be, too.

Mastering genius

The SPL Gemini also lets you enhance the stereo image of a mix. Gemini’s Balance control gives you the option of re-positioning the mid signal within the stereo spread, while its Trim control lets you tweak the mid signal level in relation to the side signal. There’s also a Stereo Width control that provides adjustment for the mix ratio between the mid and side channels. Also onboard is an Elliptical Filter, which can attenuate the low-frequency content of the side band. The SPL Gemini is a powerful tool for home, project, and commercial recording facilities and mastering houses. You will be amazed and delighted at what it can do for your mixes!

The benefits of 120V Rail Technology

SPL’s 120V Rail Technology lets the Gemini run on an operating voltage of 120 volts — twice that of discrete op-amps and four times that of semiconductor operational amplifiers — in order to achieve superior technical and sonic performance. On the technical side, 120V Rail Technology optimizes headroom and dynamic range — which manifests sonically in the effortless resolution of fine details and overall a confident, relaxed rendition of program material. Music sounds completely natural, while listening fatigue is dramatically reduced.

SPL Gemini Mastering M-S Processor Features:

  • Provides access to individual elements within a stereo mix
  • Separates mid signals from side signals
  • Enhance the stereo image
  • Balance control for re-positioning the mid signal within the stereo spread
  • Stereo Width control for adjusting the mix ratio between the mid and side channels
  • Elliptical Filter for attenuating low-frequency content in the side band
  • SPL 120V Rail Technology for superior technical and sonic performance

Warranty Info

Sweetwater's FREE 2-Year Total Confidence Coverage Warranty

Extra peace of mind at no extra cost.

  • Save money with FREE parts and labor
  • Get back to making music with the industry's fastest turnaround time
  • Fix it the first time with our award-winning, factory-certified Service Department
Learn More about Total Confidence Coverage

Offer applies only to single-receipt qualifying purchases. Select manufacturers may require that only the manufacturer’s products qualify towards the minimum purchase amount needed to be eligible for promotional financing. Otherwise, an invoice that meets the minimum purchase amount and contains at least one qualifying manufacturer product is eligible for promotional financing. No interest will be charged on promo purchase balance, and equal monthly payments are required on promo purchase until it is paid in full. The payments equal the amount financed divided by the number of months in the promo period, rounded up to the next whole dollar. These payments may be higher than the payments that would be required if this purchase was a non-promo purchase. During the last month(s) of the promo period the required monthly payment may be reduced due to the prior months’ rounding. Regular account terms apply to non-promo purchases. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

Offer applies only to single-receipt qualifying purchases. No interest will be charged on the promo balance if you pay it off, in full, within the promo period. If you do not, interest will be charged on the promo balance from the purchase date. The required minimum monthly payments may or may not pay off the promo balance before the end of the promo period, depending on purchase amount, promo length and payment allocation. Regular account terms apply to non-promo purchases and, after promo period ends, to the promo balance. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

The estimated required monthly payment shown which excludes taxes and delivery equals the amount financed divided by the number of months in the promo period, rounded up to the next cent. During the last month(s) of the promo period the required monthly payment may be reduced due to this rounding. These payments apply only with the financing offer shown. If you make these payments by the due date each month, you should pay off this amount financed within the promo period, if it is the only balance you are paying off. If you have other balances on your account, this payment will be added to any other minimum monthly payments.

Applies only to select items from this manufacturer. Ask your Sweetwater Sales Engineer for more details.