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Shure RK100PK MX Model RFI Resistant Inline Preamp — main product image
Shure RK100PK MX Model RFI Resistant Inline Preamp
Shure RK100PK MX Model RFI Resistant Inline Preamp
Shure RK100PK MX Model RFI Resistant Inline Preamp
Shure

Shure RK100PK MX Model RFI Resistant Inline Preamp

★★★★★4.4 (31 reviews)

Shure RK100PK inline preamplifier boosts RFI resistance for Microflex microphones, ensuring cleaner signal in interference-heavy environments.

$95.74*$119.00Save 19%
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Shure RK100PK is an inline preamplifier engineered specifically for Shure's Microflex microphone series. Its primary function is to boost resistance to radio frequency interference, a common problem in conference rooms, houses of worship, and broadcast environments where wireless devices, cell phones, and RF transmitters can introduce unwanted noise into the audio signal. The preamp connects inline via standard XLR connectors, sitting between the microphone and the mixer or audio interface without requiring any additional power supply beyond standard phantom power.

As a genuine Shure replacement part, the RK100PK is built to the same standards as the original preamps shipped with Microflex microphones. Its compact, unobtrusive design adds minimal bulk to the cable run, and installation is as simple as connecting two XLR cables. For installations experiencing persistent buzzing or interference artifacts, this preamp provides a targeted solution without the need to replace the entire microphone or redesign the audio chain.

Key Features

In-Line Preamplifier for Microflex Microphones. Boosts resistance to Radio Frequency Interference (RFI).

Shure Model: RK100PK

UPC Code: 42406142212

Country of Origin: China

Specifications

Brand
Shure
Model
RK100PK
Type
In-Line Preamplifier
Compatibility
Shure Microflex Microphones
Key Feature
RFI Resistance
Connector Type
XLR
Color
Black
Country of Origin
China

Pros & Cons

👍 Pros

  • Purpose-built RFI resistance reduces interference in environments with wireless devices or broadcast equipment
  • Inline design installs easily between microphone and mixer with no additional setup
  • XLR connections ensure compatibility with standard professional audio infrastructure
  • Compact form factor adds minimal weight and length to the cable run
  • Genuine Shure part ensures reliable compatibility with Microflex microphone series

👎 Cons

  • Only compatible with Shure Microflex microphones, limiting use across other mic lines
  • Minimal published specifications make it difficult to evaluate preamp gain characteristics before purchase
  • Does not address interference issues caused by non-RF sources such as electrical grounding problems
  • Single-unit packaging means outfitting multiple microphones requires purchasing several units individually

Frequently Asked Questions

The RK100PK is designed specifically for Shure Microflex series microphones. It is not intended for use with other Shure microphone lines or third-party microphones.
The preamp includes RFI-resistant circuitry that filters out unwanted radio frequency signals before they reach the rest of the audio chain, reducing buzzing and noise caused by nearby wireless devices or broadcast equipment.
It connects inline between the Microflex microphone and the mixer or audio interface using standard XLR connections.
No. The inline preamp draws phantom power from the connected mixer or audio interface, so no separate power supply is needed.
It serves as a replacement inline preamp for Microflex microphones. It can also function as an upgrade if your current preamp is experiencing RFI issues.

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