Cloud Microphones JRS34P Passive Ribbon Microphone

Co-designed with Stephen Sank, the son of RCA microphone designer Jon R. Sank, the Cloud Microphones JRS-34P merges the classic sonic DNA of the RCA 44 and BK-11 ribbon microphones with modern engineering. Featuring an ultra-thin 1.8-micron hand tuned pure aluminium ribbon paired with a custom CineMag output transformer, the JRS-34P delivers rich low end weight, silky uncoloured highs, and open transient response across vocals and instruments.

As a passive ribbon transducer, the JRS-34P requires no phantom power and delivers an uncompromised organic frequency response. Paired with a high-gain preamp or a Cloudlifter Mic Activator, the JRS-34P captures subtle acoustic textures, guitar cabinets, brass, and vocals without harsh top-end resonance.

Key Features

• Stephen Sank RCA Collaboration: Built in homage to Jon R. Sank's original RCA designs, featuring a hand-cut, hand-corrugated 1.8-micron aluminum ribbon.

• Custom CineMag Audio Transformer: Delivers rich harmonic depth, low-end extension, and precise impedance matching.

• Patented Rounded Magnet Structure: Minimizes internal acoustic reflections and phase cancellation inside the motor housing.

• Figure-8 Directional Pattern: Classic bi-directional pickup with deep $-35\text{ dB}$ side nulls for isolating sources in live rooms.

• Suspended Internal Spring Shockmount: Internal spring-mounted motor assembly reduces mechanical vibrations and handling noise.

• Rugged 180° Swivel Mount: Integrated bottom mount offers full 180∘ rotation for precise angling on mic stands.

• Handcrafted USA Construction: Built in Tucson, Arizona, using a durable grey powdercoat finish and nickel grilles. Includes a hardwood storage box.

Technical Specifications

• Microphone Type: Passive Ribbon Microphone

• Ribbon Element: 1.8-Micron Pure Aluminum, Hand-Corrugated (Dimensions: $0.19"\times 2.35"/4\text{ mm}\times 60\text{ mm}$)

• Polar Pattern: Figure-8

• Frequency Response: $20\text{ Hz}-20\text{ kHz}$

• Maximum SPL: $>138\text{ dB SPL}$ (above 1 kHz)

• Output Sensitivity: $-49\text{ dBV/Pa}$

• Nominal Output Impedance: $150\Omega$ ($1\text{ k}\Omega$ or higher recommended load)

• Power Requirements: None (Passive — Do NOT supply $+48\text{V}$ Phantom Power)

• Output Connector: XLR 3-Pin Male (Neutrik Gold Pin)

• Included Accessories: Custom Hardwood Storage Box, Protective Storage Sleeve

• Dimensions & Weight: $7.75"\times 3"\times 1.75"/19.7\text{ cm}\times 7.6\text{ cm}\times 4.5\text{ cm}$; $1.02\text{ lbs}/460\text{ g}$

• Enclosure Construction: Handcrafted Steel Chassis with Grey Powdercoat Finish (Tucson, AZ, USA)