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Cloud JRS-34 Ribbon Mic

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Description

Cloud JRS-34 Ribbon Microphone Overview

  Cloud Microphones JRS-34 passive ribbon microphone showing full body and internal spring-mounted suspension system with custom wood case

Born from RCA's Most Celebrated Work. Built for Yours.

The name JRS-34 carries a specific weight. Jon R. Sank spent his career at RCA designing the ribbon microphones that shaped the sound of American recording: the 44, the BK-11A, the instruments that engineers spent the rest of the 20th century hunting for on the vintage market. His son, Stephen Sank, grew up inside that world. When Rodger Cloud set out to build a ribbon microphone in 2006 after years of refurbishing vintage units, Stephen Sank was the collaborator he needed. The JRS-34 is their shared answer to what a new ribbon microphone built on that foundation should actually sound like.

The result is not a replica and not an homage. It is a working professional instrument that draws directly on RCA's engineering principles while improving on them in every measurable dimension. Each ribbon element is cut, corrugated, and installed by hand, exactly as prescribed by Harry Olson's original RCA method, and then refined with a custom CineMag transformer, patented rounded magnet geometry, and an internal spring-suspension system that protects the element from handling shock without anchoring it in ways that compromise its acoustic integrity.

 Cloud JRS-34 ribbon microphone figure-8 polar pattern close-up showing 1.8-micron hand-corrugated ribbon element and rounded magnet technology

The 1.8-Micron Ribbon That Defines the Sound

At 1.8 microns thick and 0.19" wide across a 2.35" length, the JRS-34's ribbon element sits at the edge of what is physically achievable in ribbon fabrication. This is where the character comes from. A ribbon this thin responds to air pressure with a speed and delicacy that condenser capsules, with all their electrical precision, cannot replicate. Transients arrive naturally softened at the leading edge, not by EQ or limiting, but by the physics of a thin metal foil moving through a magnetic field. Brass loses its harshest bite. Strings gain body without losing articulation. Voices land with a presence and weight that feels analog in every sense of the word.

Polar pattern: Figure-8, -35 dB null at 90 degrees
Ribbon element: 0.19" wide x 2.35" long x 1.8 microns thick, hand-cut and hand-corrugated
Output sensitivity: -49 dBv/Pa
Output impedance: 150 ohms nominal
Recommended load impedance: 1kΩ or greater
Frequency response: 20 Hz to above 20 kHz
Maximum SPL: 138 dB at 1 kHz
Transformer: Custom CineMag
Magnet: Patented rounded magnet technology

Cloud JRS-34 passive ribbon mic positioned on studio stand in front of grand piano showing orchestral tracking application

Passive Purity or Active Headroom: Choose Your Configuration

The JRS-34 is offered in passive form, which is a deliberate choice for engineers who understand impedance loading and want full control over it. When a passive ribbon sees different preamp input impedances, the frequency response, transient character, and tonal weight of the mic shift perceptibly. That variation is a feature. Paired with a transformer-coupled preamp running at low-to-moderate gain, the JRS-34 passive responds with the kind of thick, unhurried low midrange that engineers spend thousands chasing in vintage units. Paired with a higher-impedance input, it opens up, breathes more freely, and loses some of that classic warmth in exchange for detail and extension.

For setups where that control isn't the goal, or where the preamp gain structure makes passive ribbon operation impractical, a Cloudlifter inline will restore full headroom and effectively replicate what the active circuit version delivers: an isolated 3kΩ input impedance that removes preamp variability from the equation and adds up to +25dB of clean gain before the signal ever reaches the interface. Either path produces the same fundamental character. The choice is about control versus convenience, not quality.

Highlights

  • Passive ribbon microphone designed by Rodger Cloud in direct collaboration with Stephen Sank, son of RCA ribbon designer Jon R. Sank, combining principles of the RCA 44A and the Jon-Sank-designed RCA BK-11A
  • 1.8-micron ribbon element, 0.19" wide x 2.35" long, hand-cut and hand-corrugated in Tucson, Arizona using Harry Olson's original RCA installation method
  • Patented rounded magnet technology for optimized magnetic field geometry across the ribbon element
  • Custom CineMag transformer for optimal passive output performance and loading characteristics
  • Figure-8 polar pattern with -35 dB null at 90 degrees, ideal for mid-side, room-ambient, and source-isolation applications
  • Output sensitivity: -49 dBv/Pa; output impedance: 150 ohms nominal; recommended load: 1kΩ or greater
  • Frequency response: 20 Hz to above 20 kHz
  • Maximum SPL: 138 dB at 1 kHz, suitable for brass, amplified guitar, and high-SPL acoustic sources
  • Internal spring-suspension system with four springs (two of nickel-plated beryllium-copper alloy, also serving as signal conductors), isolating the entire ribbon motor from the body without compromising acoustic performance
  • Mount offers 180-degree range of motion for precise off-axis positioning
  • Requires high-gain preamp with 1kΩ or greater input impedance; Cloudlifter CL-1 recommended for moderate preamp setups
  • Does not pass phantom power to the ribbon element; fully safe with standard phantom-equipped preamps and interfaces
  • Dimensions: 7.75" x 3" x 1.75" / Weight: 1.02 lbs
  • Handmade entirely in Tucson, Arizona, USA with US-sourced components
  • 2-year warranty on the ribbon element; limited lifetime warranty on all other parts (with registration)
  • Includes custom handcrafted wood case and microfiber mic cover

Cloud JRS-34 Specifications

Specification Details
Transducer Type Passive Ribbon (Velocity)
Polar Pattern Figure-8 (Bidirectional), -35 dB null at 90 degrees
Ribbon Element Dimensions 0.19" wide x 2.35" long x 1.8 microns thick
Ribbon Installation Hand-cut, hand-corrugated, and hand-installed
Transformer Custom CineMag
Magnet Technology Patented Rounded Magnet
Frequency Response 20 Hz to above 20 kHz
Output Sensitivity -49 dBv/Pa
Output Impedance 150 ohms nominal
Recommended Load Impedance 1kΩ or greater
Maximum SPL 138 dB at 1 kHz
Phantom Power Not required; does not pass phantom to ribbon element
Suspension System Internal 4-spring motor suspension; 2 springs nickel-plated beryllium-copper alloy (signal conductors)
Mount Range of Motion 180 degrees
Connector Integrated 3-pin XLR (female)
Dimensions 7.75" x 3" x 1.75"
Weight 1.02 lbs
Manufacturing Handmade entirely in Tucson, Arizona, USA with US-sourced components
Ribbon Element Warranty 2 years
All Other Parts Warranty Limited Lifetime (with registration)

What's in the Box

Item Details
Cloud JRS-34 Passive Ribbon Microphone 1x Handmade ribbon microphone with integrated XLR connector and 180-degree swivel mount
Custom Wood Case Handcrafted storage and presentation case
Microfiber Mic Cover Protective microfiber cloth for storage and cleaning
Documentation Warranty card and product registration information
Shipping

Shipping & Returns

  • We deliver all US orders in 3–5 business days
  • Free cancellations
  • Returns accepted within 30 days (unused items)

Order Confirmation

Once your order is placed, you will receive an order confirmation email. This confirms that we have received your order and have pre-authorized your credit card for the purchase. After confirming availability with our suppliers, we will proceed accordingly:

  • If your item is available and ready to ship within 1–2 business days, we will process the charge and arrange for shipment.

  • If your item is on backorder or unavailable, the pre-authorization will be voided and you will be notified by email.

  • Please note: While most items ship out within 1–2 business days, total delivery time is typically 3–5 business days, depending on your location and carrier handling.

Order Shipment

If your item is in stock and your payment has been processed, your order will typically ship within 1–2 business days. Total delivery time is approximately 3–5 business days from the date of order. Once shipped, you will receive tracking information at the email address provided during checkout within 24 hours of dispatch.

If you have not received tracking information within 3–5 business days of placing your order, please contact us at support@proaudioreserve.com.

The Distributor-Direct Advantage

To ensure you receive the most recent hardware revisions and 100% factory-sealed units, Pro Audio Reserve utilizes a Distributor-Direct fulfillment model. Unlike big-box retailers that may ship "floor models" or gear that has been sitting in general-purpose warehouses, your equipment is pulled directly from the primary manufacturer hub, serialized, and dispatched. This process ensures the highest level of quality control for professional-grade recording equipment.

Shipping Policy

We currently offer free shipping within the United States only. If the checkout process on our website allows you to enter a shipping address and complete your order, your location is eligible to receive delivery.

Changing Shipping Address

If you need to change your shipping address after your order has been processed or shipped, we will do our best to accommodate the request. Please note that address changes may result in delivery delays. Any additional costs incurred due to address changes, including carrier fees or rerouting charges will be the responsibility of the customer. No exceptions.

Shipping Times

All shipping times provided are estimates and should not be considered guarantees. Most orders ship out within 1–2 business days from the time payment is processed. However, total delivery time is typically 3–5 business days, depending on your location, carrier performance, and supplier fulfillment timelines.

We work closely with our vendors to ensure timely deliveries, but please note that supply chain disruptions, high-demand periods, or weather events may occasionally cause delays beyond our control.

  • To avoid misunderstandings: The “shipping time” refers to the total time from order placement to final delivery, not just when the item leaves the warehouse.

  • Cancellations: If you choose to cancel your order because it has not arrived within the estimated delivery window, you may be responsible for applicable shipping charges, restocking fees, warehouse handling costs, and other related fees.

  • Chargebacks: Customers who initiate chargebacks due to shipping delays without contacting us first may be held legally responsible for losses. We strongly encourage open communication so we can resolve any delivery concerns directly and efficiently via our Atlanta-based support team.

Delivery Options

  • Threshold Shipping: Your item will be delivered to your front door, porch, garage, or a covered entryway.

 

Why Buy From Us

We get it. You've got a lot of choice when it comes to online retailers.
Here's why we think you should shop with us at ProAudioReserve.

  • Free Shipping USA wide. 
  • 30 Day Easy Returns. Not happy with your product, we'll take it back noquestions asked.
  • Great Service. We pride ourselves on the best service, anywhere.

Reviews

Customer Reviews

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Description

Cloud JRS-34 Ribbon Microphone Overview

  Cloud Microphones JRS-34 passive ribbon microphone showing full body and internal spring-mounted suspension system with custom wood case

Born from RCA's Most Celebrated Work. Built for Yours.

The name JRS-34 carries a specific weight. Jon R. Sank spent his career at RCA designing the ribbon microphones that shaped the sound of American recording: the 44, the BK-11A, the instruments that engineers spent the rest of the 20th century hunting for on the vintage market. His son, Stephen Sank, grew up inside that world. When Rodger Cloud set out to build a ribbon microphone in 2006 after years of refurbishing vintage units, Stephen Sank was the collaborator he needed. The JRS-34 is their shared answer to what a new ribbon microphone built on that foundation should actually sound like.

The result is not a replica and not an homage. It is a working professional instrument that draws directly on RCA's engineering principles while improving on them in every measurable dimension. Each ribbon element is cut, corrugated, and installed by hand, exactly as prescribed by Harry Olson's original RCA method, and then refined with a custom CineMag transformer, patented rounded magnet geometry, and an internal spring-suspension system that protects the element from handling shock without anchoring it in ways that compromise its acoustic integrity.

 Cloud JRS-34 ribbon microphone figure-8 polar pattern close-up showing 1.8-micron hand-corrugated ribbon element and rounded magnet technology

The 1.8-Micron Ribbon That Defines the Sound

At 1.8 microns thick and 0.19" wide across a 2.35" length, the JRS-34's ribbon element sits at the edge of what is physically achievable in ribbon fabrication. This is where the character comes from. A ribbon this thin responds to air pressure with a speed and delicacy that condenser capsules, with all their electrical precision, cannot replicate. Transients arrive naturally softened at the leading edge, not by EQ or limiting, but by the physics of a thin metal foil moving through a magnetic field. Brass loses its harshest bite. Strings gain body without losing articulation. Voices land with a presence and weight that feels analog in every sense of the word.

Polar pattern: Figure-8, -35 dB null at 90 degrees
Ribbon element: 0.19" wide x 2.35" long x 1.8 microns thick, hand-cut and hand-corrugated
Output sensitivity: -49 dBv/Pa
Output impedance: 150 ohms nominal
Recommended load impedance: 1kΩ or greater
Frequency response: 20 Hz to above 20 kHz
Maximum SPL: 138 dB at 1 kHz
Transformer: Custom CineMag
Magnet: Patented rounded magnet technology

Cloud JRS-34 passive ribbon mic positioned on studio stand in front of grand piano showing orchestral tracking application

Passive Purity or Active Headroom: Choose Your Configuration

The JRS-34 is offered in passive form, which is a deliberate choice for engineers who understand impedance loading and want full control over it. When a passive ribbon sees different preamp input impedances, the frequency response, transient character, and tonal weight of the mic shift perceptibly. That variation is a feature. Paired with a transformer-coupled preamp running at low-to-moderate gain, the JRS-34 passive responds with the kind of thick, unhurried low midrange that engineers spend thousands chasing in vintage units. Paired with a higher-impedance input, it opens up, breathes more freely, and loses some of that classic warmth in exchange for detail and extension.

For setups where that control isn't the goal, or where the preamp gain structure makes passive ribbon operation impractical, a Cloudlifter inline will restore full headroom and effectively replicate what the active circuit version delivers: an isolated 3kΩ input impedance that removes preamp variability from the equation and adds up to +25dB of clean gain before the signal ever reaches the interface. Either path produces the same fundamental character. The choice is about control versus convenience, not quality.

Highlights

  • Passive ribbon microphone designed by Rodger Cloud in direct collaboration with Stephen Sank, son of RCA ribbon designer Jon R. Sank, combining principles of the RCA 44A and the Jon-Sank-designed RCA BK-11A
  • 1.8-micron ribbon element, 0.19" wide x 2.35" long, hand-cut and hand-corrugated in Tucson, Arizona using Harry Olson's original RCA installation method
  • Patented rounded magnet technology for optimized magnetic field geometry across the ribbon element
  • Custom CineMag transformer for optimal passive output performance and loading characteristics
  • Figure-8 polar pattern with -35 dB null at 90 degrees, ideal for mid-side, room-ambient, and source-isolation applications
  • Output sensitivity: -49 dBv/Pa; output impedance: 150 ohms nominal; recommended load: 1kΩ or greater
  • Frequency response: 20 Hz to above 20 kHz
  • Maximum SPL: 138 dB at 1 kHz, suitable for brass, amplified guitar, and high-SPL acoustic sources
  • Internal spring-suspension system with four springs (two of nickel-plated beryllium-copper alloy, also serving as signal conductors), isolating the entire ribbon motor from the body without compromising acoustic performance
  • Mount offers 180-degree range of motion for precise off-axis positioning
  • Requires high-gain preamp with 1kΩ or greater input impedance; Cloudlifter CL-1 recommended for moderate preamp setups
  • Does not pass phantom power to the ribbon element; fully safe with standard phantom-equipped preamps and interfaces
  • Dimensions: 7.75" x 3" x 1.75" / Weight: 1.02 lbs
  • Handmade entirely in Tucson, Arizona, USA with US-sourced components
  • 2-year warranty on the ribbon element; limited lifetime warranty on all other parts (with registration)
  • Includes custom handcrafted wood case and microfiber mic cover

Cloud JRS-34 Specifications

Specification Details
Transducer Type Passive Ribbon (Velocity)
Polar Pattern Figure-8 (Bidirectional), -35 dB null at 90 degrees
Ribbon Element Dimensions 0.19" wide x 2.35" long x 1.8 microns thick
Ribbon Installation Hand-cut, hand-corrugated, and hand-installed
Transformer Custom CineMag
Magnet Technology Patented Rounded Magnet
Frequency Response 20 Hz to above 20 kHz
Output Sensitivity -49 dBv/Pa
Output Impedance 150 ohms nominal
Recommended Load Impedance 1kΩ or greater
Maximum SPL 138 dB at 1 kHz
Phantom Power Not required; does not pass phantom to ribbon element
Suspension System Internal 4-spring motor suspension; 2 springs nickel-plated beryllium-copper alloy (signal conductors)
Mount Range of Motion 180 degrees
Connector Integrated 3-pin XLR (female)
Dimensions 7.75" x 3" x 1.75"
Weight 1.02 lbs
Manufacturing Handmade entirely in Tucson, Arizona, USA with US-sourced components
Ribbon Element Warranty 2 years
All Other Parts Warranty Limited Lifetime (with registration)

What's in the Box

Item Details
Cloud JRS-34 Passive Ribbon Microphone 1x Handmade ribbon microphone with integrated XLR connector and 180-degree swivel mount
Custom Wood Case Handcrafted storage and presentation case
Microfiber Mic Cover Protective microfiber cloth for storage and cleaning
Documentation Warranty card and product registration information
Shipping

Shipping & Returns

  • We deliver all US orders in 3–5 business days
  • Free cancellations
  • Returns accepted within 30 days (unused items)

Order Confirmation

Once your order is placed, you will receive an order confirmation email. This confirms that we have received your order and have pre-authorized your credit card for the purchase. After confirming availability with our suppliers, we will proceed accordingly:

  • If your item is available and ready to ship within 1–2 business days, we will process the charge and arrange for shipment.

  • If your item is on backorder or unavailable, the pre-authorization will be voided and you will be notified by email.

  • Please note: While most items ship out within 1–2 business days, total delivery time is typically 3–5 business days, depending on your location and carrier handling.

Order Shipment

If your item is in stock and your payment has been processed, your order will typically ship within 1–2 business days. Total delivery time is approximately 3–5 business days from the date of order. Once shipped, you will receive tracking information at the email address provided during checkout within 24 hours of dispatch.

If you have not received tracking information within 3–5 business days of placing your order, please contact us at support@proaudioreserve.com.

The Distributor-Direct Advantage

To ensure you receive the most recent hardware revisions and 100% factory-sealed units, Pro Audio Reserve utilizes a Distributor-Direct fulfillment model. Unlike big-box retailers that may ship "floor models" or gear that has been sitting in general-purpose warehouses, your equipment is pulled directly from the primary manufacturer hub, serialized, and dispatched. This process ensures the highest level of quality control for professional-grade recording equipment.

Shipping Policy

We currently offer free shipping within the United States only. If the checkout process on our website allows you to enter a shipping address and complete your order, your location is eligible to receive delivery.

Changing Shipping Address

If you need to change your shipping address after your order has been processed or shipped, we will do our best to accommodate the request. Please note that address changes may result in delivery delays. Any additional costs incurred due to address changes, including carrier fees or rerouting charges will be the responsibility of the customer. No exceptions.

Shipping Times

All shipping times provided are estimates and should not be considered guarantees. Most orders ship out within 1–2 business days from the time payment is processed. However, total delivery time is typically 3–5 business days, depending on your location, carrier performance, and supplier fulfillment timelines.

We work closely with our vendors to ensure timely deliveries, but please note that supply chain disruptions, high-demand periods, or weather events may occasionally cause delays beyond our control.

  • To avoid misunderstandings: The “shipping time” refers to the total time from order placement to final delivery, not just when the item leaves the warehouse.

  • Cancellations: If you choose to cancel your order because it has not arrived within the estimated delivery window, you may be responsible for applicable shipping charges, restocking fees, warehouse handling costs, and other related fees.

  • Chargebacks: Customers who initiate chargebacks due to shipping delays without contacting us first may be held legally responsible for losses. We strongly encourage open communication so we can resolve any delivery concerns directly and efficiently via our Atlanta-based support team.

Delivery Options

  • Threshold Shipping: Your item will be delivered to your front door, porch, garage, or a covered entryway.

 

Why Buy From Us

We get it. You've got a lot of choice when it comes to online retailers.
Here's why we think you should shop with us at ProAudioReserve.

  • Free Shipping USA wide. 
  • 30 Day Easy Returns. Not happy with your product, we'll take it back noquestions asked.
  • Great Service. We pride ourselves on the best service, anywhere.

Reviews

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)