Noise-dampening XLR input caps • blocks RF/EMI distortion • solid metal grounding construct • protects open balanced inputs from corrosion & dust • pack of 2 caps
The AudioQuest XLR Input Noise-Stopper (Set of 2) is a simple yet effective system refinement designed to block airborne radio frequency (RF) and electromagnetic interference (EMI) from entering open, unused XLR input ports. Crafted from high-density solid metal alloys, these grounding caps fit securely over open male XLR input connectors on preamplifiers, integrated amplifiers, DACs, and power amps, lowering the system's noise floor to reveal subtle micro-details, expanded soundstage depth, and cleaner dynamic contrast.
Key Features & Innovations
Blocks Radio Frequency (RF) & Electromagnetic (EMI) Interference — the AudioQuest XLR Input Noise-Stopper (Set of 2) prevents open, unshielded male XLR input jacks from acting as antennas for stray atmospheric digital noise.
Grounding Solid Metal Alloy Shielding Construction — heavy-duty metallic construction ties open input pins to chassis ground, dampening background hash, hum, and high-frequency digital artifacts.
Protects Internal Contacts & Input Circuitry — physically seals unused XLR input sockets against airborne dust, humidity, oxidation, and contact point degradation.
Universal XLR Input Compatibility — engineered to fit female pin assemblies of male XLR input jacks on preamplifiers, digital-to-analog converters (DACs), surround processors, and power amplifiers.
Non-Invasive System Optimization — purely passive protective accessories that lower system noise floor without altering signal path impedance or risking component stability.
FAQ — XLR Input Noise-Stopper
What is the difference between XLR Input caps and XLR Output caps?
The AudioQuest XLR Input Noise-Stopper (Set of 2) caps are designed specifically for male XLR input ports (female barrel connectors). Input caps utilize a shorting configuration to ground signal pins to chassis ground for maximum noise blocking, making them strictly intended for input jacks only.
Can I use these XLR Input caps on active XLR output jacks?
No. XLR Input caps are shorted to ground and should only be placed on open input jacks. For active output sockets, use AudioQuest XLR Output Noise-Stopper caps, which are non-shorting to prevent output circuit damage.
Why do unused XLR jacks need to be covered?
Unused, exposed XLR jacks act like small radio antennas that pick up high-frequency RF and EMI interference from Wi-Fi routers, smart phones, and household electronics. Grounding and shielding these ports keeps stray high-frequency energy out of your audio signal path.
How many caps are included in a single package?
Each package contains a set of two (2) AudioQuest XLR Input Noise-Stopper caps, perfect for covering a left and right stereo input pair.
Why Buy From Us
Authorized AudioQuest dealer offering 100% factory-authentic system accessories with full manufacturer support
Expert audiophile consultants available to assist with noise-floor optimization, cable geometry, and system tuning
Dedicated post-purchase technical support for high-end audio component calibration
Fast, secure shipping with protective packaging on every order
