Royer Labs RSM-SS251 is a patented Sling-Shock suspension shockmount (Patent #8,571,250) designed for microphones approximately 50 mm (2 inches) in diameter — including studio classics such as the Telefunken ELAM 251/251E, Neumann U-67, Neumann U-87, and other similarly sized microphones. The RSM-SS251 is the largest model in Royer's Sling-Shock line; the smaller RSM-SS1 handles 1-inch diameter microphones (Royer R-121, R-122, SF-12), and the RSM-SS24 is designed for approximately 1.5-inch diameter microphones (Royer SF-2, SF-24, SF-24V). The defining feature of all Sling-Shock models is the complete elimination of rubber and elastic components — replaced by a system of non-resonant nylon cord and damped steel springs.
Nylon and springs instead of rubber — isolation without material degradation
Conventional shockmounts rely on elastic bands or rubber supports that lose tension, stretch, or crack over time — leading to loose mic retention, risk of falls, and the need for periodic parts replacement. The RSM-SS251 addresses this at the design level: the suspension system built on non-resonant nylon cord and damped steel springs does not age, does not lose its isolation properties, and requires no replacement parts. Isolation covers vibrations transmitted through the stand, physical shocks, and self-resonance of the mount itself — the last point is particularly relevant in high-SPL applications such as close-miking electric guitar, where conventional mounts can resonate and introduce artifacts into the recording. A built-in cable clip reduces additional vibrations conducted through the microphone cable into the mic body. The microphone chamber interior is felt-lined, protecting the microphone's finish and providing a snug, non-slip fit.
Compatibility and construction
The RSM-SS251's chamber accommodates microphones of approximately 50 mm (2 inches) in diameter. Compatible microphones include: Telefunken ELAM 251 and 251E (original and new), Neumann U-67, Neumann U-87, Bock Audio 251, Peluso 22 251, Audio-Technica AT 4047/SV, AT4060, Miktek CV3, Mojave Audio MA-1000, MA-200, MA-201fet, MA-300, MA-300fet, and other similarly sized microphones. Note that typical Neumann U-47 style microphones are too wide for this mount. The adjustable grip allows quick installation and removal while maintaining flexible positioning even in tight spaces. The RSM-SS251 is built to Royer's standard of solid construction and carries a lifetime warranty.
KEY FEATURES
- Patented Sling-Shock system (Patent #8,571,250) — no rubber parts, no elastic bands
- Suspension: non-resonant nylon cord + damped steel springs — isolation without material aging
- Microphone chamber: approximately 50 mm (2 inches) in diameter
- Felt-lined chamber interior — finish protection, secure non-slip retention
- Built-in cable clip — reduces vibrations conducted through the microphone cable
- Isolation from stand vibrations, physical shocks, and mount self-resonance
- Eliminates mount resonance artifacts in high-SPL applications
- Adjustable grip — flexible positioning in tight spaces
- Compatible with: Telefunken ELAM 251/251E, Neumann U-67, Neumann U-87, Audio-Technica AT4047/SV, AT4060, Mojave Audio MA-200, MA-201fet, MA-300, MA-300fet, and similar
- Largest model in the Sling-Shock line (RSM-SS1: 1", RSM-SS24: 1.5", RSM-SS251: 2")
- Solid Royer construction; lifetime warranty
TECHNICAL SPECIFICATIONS
- Type: Sling-Shock suspension shockmount
- Patent: #8,571,250
- Microphone chamber diameter: approximately 50 mm (2 inches)
- Suspension elements: non-resonant nylon cord + damped steel springs
- Chamber lining: felt (finish protection, secure retention)
- Cable clip: built-in
- Dimensions: approximately 110 x 110 x 110 mm
- Warranty: lifetime
