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Focusrite ISA428 MkII 4-channel Microphone Preamp , $2,399.99 - Add to Cart Skip to Product Information

Focusrite ISA428 MkII 4-channel Microphone Preamp

4-channel Transformer-based Mic/Instrument Preamp
Focusrite ISA428 MkII 4-channel Microphone Preamp
Focusrite ISA428 MkII 4-channel Microphone Preamp

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 Focusrite. Go ahead and place your order and we'll follow up shortly to let you know when to expect it. Estimated September 14, 2026

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Focusrite ISA428 MkII 4-channel Microphone Preamp
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 Focusrite. Go ahead and place your order and we'll follow up shortly to let you know when to expect it. Estimated September 14, 2026

Here's an Awesome Deal on a Focusrite Pre 4-pack

This article was Written By

Our Product Research Team

Get to know them!

A 4-pack of Focusrite microphone preamplifiers has never been so affordable! Focusrite's ISA428 MkII retains all of the primary functions of the original ISA428. You get four hand-wound transformer-based preamps built around the original ISA 110 preamp circuit, housed in a convenient 2U chassis. Each of these incredible preamps features switchable impedance and an impressive 122dB of dynamic range, and each provides you with Focusrite's highly sought-after warm and transparent sound. You also get the same fantastic DI circuits found on the original ISA428, a favorite of many engineers for the bite they give electric bass. And by omitting the bulky VU meters and soft limiters, and retaining the precise LED metering of the original ISA428, Focusrite reduced the environmental footprint of the ISA428 MkII. They've also uncluttered its face and reduced its cost, all without impacting its performance. An optional A/D conversion card gives you up to eight channels of conversion over ADAT lightpipe, so the ISA428 MkII is as easy to integrate into your DAW as ever.

Focusrite ISA428 MkII 4-channel Microphone Preamplifier Features at a Glance:
  • 4 classic transformer-based preamps
  • Switchable impedance for unparalleled mic matching or extended mic creativity
  • Includes the classic ISA 110 setting
  • Multiple direct instrument inputs on the front panel
  • Analog insert points on every channel
  • Highpass filters on every channel
  • Ultra-precise LED metering (dBfs)
  • 2U chassis design
  • Optional A/D card provides 8 channels of cutting-edge conversion at up to 192kHz
  • Free Brainworx bx_console re-creation of Focusrite's ISA 110 and ISA 130 modules
  • 3-year warranty
The Focusrite ISA428 MkII gives you an amazing deal on four microphone preamps!

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.