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SPL Transient Designer 4 MK2 Certified Open Box , $1,189.15 - Add to Cart Skip to Product Information

SPL Transient Designer 4 MK2 Certified Open Box

4-channel Dynamic Effects Processor with Attack, Sustain, and Stereo Link
Item ID: TranDesign4Mk2d1
SPL Transient Designer 4 MK2

Certified Open Box Savings!

Save $209.85 What is Certified Open Box?

The price below reflects your savings.

Savings: $209.85 New for $1,399.00
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SPL Transient Designer 4 MK2 Certified Open Box

Certified Open Box Savings!

Save $209.85 What is Certified Open Box?

The price below reflects your savings.

Savings: $209.85 New for $1,399.00

Shape Transients Like Never Before

This article was Written By

Our Product Research Team

Get to know them!

The original SPL Transient Designer caused a huge stir upon its introduction in 1998, but SPL has now upped the ante. Featuring the same Differential Envelope Technology (DET) and 4-channel level-independent processing qualities as its forerunner, the Transient Designer MK2 adds a new design and an even more stylish look and feel. Its 4mm thick black anodized faceplate, solid aluminum-milled knobs, and black powder coated high-quality steel housing look fantastic in any rack. Under the hood, you’ll find Neutrik XLR connectors with gold-plated contacts on all four channels and an electronically balanced signal transmission at a nominal +6dB level. And, as always, only two controls are needed to get incredible results with this brilliant device.

On the Attack

Sweetwater studio engineers repeatedly praise the SPL Transient Designer 4 MK2’s ease of use. Attack, one of only two controls needed, allows you to increase or decrease the transient response of a signal by +/- 15dB. Positive values indicate boosts, while negative values indicate attenuations. You can bet those snare drums will crack like you’ve never heard before!

Sculpt the Sustain

Next, the Sustain control extends or shortens the sustain phase of a signal by +/- 24dB. Similarly, positive values extend the sustain and negative values shorten it. This control lets you sculpt the exact amount of ring that you’d like your signal to have.

Process stereo signals

The SPL Transient Designer 4 MK2 also has some other useful features. With its Link function, you’ll also be able to process stereo signals by linking together channels 1+2 or channels 3+4, with the left channel becoming the master. Other valuable controls include an On switch for quick bypassing to compare processed and unprocessed signals; a Sig (signal) LED informs you if an input signal has a level greater than -20dB.

SPL Transient Designer 4 MK2 Features:

  • Differential Envelope Technology (DET) processes attack and sustain levels independently for incredible transient shaping
  • Only 2 controls needed: Attack and Sustain
  • Attack shapes the transient phase of a signal by +/- 15dB
  • Sustain shapes the sustain phase of a signal by +/- 24dB
  • On switch allows for quick A/B’ing of processed and unprocessed signals
  • Link enables processing of stereo signals of Channels 1+2 or Channels 3+4
  • Signal (Sig) LED displays if an input signal has a level greater than -20dB
  • Black powder coated high-quality steel housing
  • 4mm thick black anodized aluminum faceplate
  • Knobs milled from solid aluminum
  • All 4 channels feature Neutrik XLR sockets with gold-plated contacts and balanced signal transmission of +6dB nominal level
  • Frequency Range (-3dB): 10Hz–100kHz
  • THD+N (0dBu, 10Hz–22kHz): -90dB
  • Noise (A-weighted): -97dB
  • Dynamic range: 118dB
  • Dimensions (W x H x D): 19 inches x 1.27 inches x 9.33 inches
  • Weight: 7.27 lbs.
What is Certified Open Box Gear?

At Sweetwater, we're so picky that what we call "Certified Open Box" is actually better than what most music retailers sell as "new" gear! Our gear hasn't endured hundreds of people a week plunking away at all the keyboards, fumbling through Stairway to Heaven on every guitar or playing with every fader and knob on a mixer or control surface.

Certified Open Box (also known as a demo) means we’ve had it out of the box for our YouTube channel, displayed at events, tested in our studio, or maybe it was in a customer’s hands for a few days and isn’t ‘factory fresh’ as a result. Every Certified Open Box item we sell has Sweetwater’s 2-year Total Confidence Coverage™ warranty and has been tested and verified up to ‘new’ specs by our factory-authorized technicians to make sure it’s in perfect working order before we ship it to you.

When you buy a Certified Open Box item at Sweetwater, you get:
  • 2-year Total Confidence Coverage Warranty™!
  • Products inspected and tested by our factory-authorized techs, guaranteed to function like new (or better)!
  • FREE shipping on most items
  • Equipment that will MEET or EXCEED your expectations!

Click HERE to browse our current inventory of Certified Open Box equipment. Purchasing Certified Open Box gear from Sweetwater is a smart and safe way to save!

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.