Cartridge for SM81

The R104 is identified in the supplied product data as a cartridge for the SM81. The associated Shure source identifies the SM81 as a condenser instrument microphone and connects it with overhead pickup, studio recording, and acoustic instruments. This description keeps those system-level details separate from the cartridge itself: no cartridge-specific electrical, acoustic, dimensional, material, or warranty data was supplied, so none is presented as a confirmed product feature.

Ideal Use Cases

This cartridge is intended for buyers sourcing a component specifically identified for the SM81. That makes it relevant to SM81 component procurement, maintenance planning, inventory matching, or a service evaluation in which the required item is named R104. The underlying SM81 is associated in the source data with overhead use, studio work, recording, and acoustic instruments. Those are applications of the microphone, not independent performance claims for the cartridge. Buyers working with another microphone model should not assume cross-compatibility from the available information.

Why Choose This Model

The strongest reason to choose this listing is identification precision. The product title states “Cartridge for SM81,” and the assigned SKU is R104, giving two concrete references to compare with an existing requirement, internal parts list, or purchase request. The related source is Shure’s SM81 product page, which establishes the microphone family and identifies the SM81 as part of the SM series. The data does not supply a universal-fit statement, alternate compatible models, a UPC, an EAN, or an MPN; selection should therefore remain tied to the stated SM81 application and R104 SKU.

Installation and Integration

No installation instructions were included in the supplied information. The source does not state whether fitting the cartridge requires disassembly, specialized tools, soldering, alignment, calibration, or a particular service procedure. It also does not identify connectors, voltage requirements, dimensions, weight, mounting hardware, or included accessories for R104. Before integration, match the SM81 model designation and R104 SKU to the intended service documentation or procurement record. If technical service is required, use the applicable SM81 documentation; the associated source indicates that product support, documentation, guides, safety information, and user guide/spec resources exist, but their contents were not provided here.

Performance Highlights

The supplied source describes the SM81 as having a wide frequency response and lists a selectable low-frequency response of flat, 6 dB/octave rolloff, or 18 dB/octave rolloff. These details describe the associated SM81 microphone and help establish the context in which R104 is identified. They do not establish standalone frequency response, sensitivity, impedance, self-noise, maximum sound-pressure level, polar pattern, or output specifications for the cartridge. No before-and-after performance claim, tonal characterization, or measured cartridge data was supplied. For that reason, this listing does not claim that R104 changes, improves, or restores any particular measured characteristic.

What Makes It Different

R104 is presented as a model-specific cartridge listing rather than as the complete SM81 condenser instrument microphone. That distinction matters when comparing products: the available data identifies a component for the microphone, while the associated source page primarily documents the complete SM81. The SKU and SM81 designation are therefore the key differentiators available for this item. No evidence was supplied for bundles, accessories, alternate finishes, package quantity, country of origin, or additional model compatibility. The listing also avoids using the source page’s microphone imagery as a confirmed cartridge image because no reliable cartridge-specific image was identified.

Final Assessment

For a buyer whose requirement is explicitly “Cartridge for SM81” and whose purchasing reference is R104, this listing provides a direct name-and-SKU match. The Shure source confirms the SM81 context and its condenser instrument microphone classification, while the cartridge-level specification set remains limited. Confirm any installation, package-content, warranty, and electrical requirements before ordering because those details are absent from the supplied data. On the information available, R104 should be evaluated as an SM81-specific cartridge component, not as a complete microphone or a broadly compatible microphone cartridge.