Shure A15LA Line Adapter In-Line XLR Format

The A15LA drops an audio signal by 50dB, allowing line–level outputs to connect directly to microphone–level inputs without distortion or overload. This in–line attenuator from Shure addresses a common problem in live sound and recording setups where mixers, interfaces, and processors expect mic–level signals but receive hotter line–level feeds from playback devices, DJ gear, or certain outboard units. The XLR format makes it a passive, plug–and–play component that requires no power or configuration.

With a 50dB reduction in signal level, the A15LA brings typical line outputs down to a range that microphone preamps can handle cleanly. The adapter uses a male XLR input and female XLR output, fitting directly in–line on any standard mic cable without requiring adapters or custom wiring. Its passive circuitry means zero noise floor contribution and no need for batteries or phantom power. The compact metal housing is built to withstand the rigours of gigging and touring, maintaining signal integrity across hundreds of connect–disconnect cycles.

Applications span FOH mixing, where laptops or media players feed into console mic inputs, and studio tracking scenarios where hardware synths or drum machines with line–level outputs need to interface with mic preamps. The A15LA also proves useful in legacy installs where equipment signal levels don't match, preventing the clipping and distortion that occurs when hot signals hit preamps expecting quieter mic–level sources. It's a straightforward fix for level–matching issues that would otherwise require DI boxes or costly signal processors.

Features

• 50dB attenuation reduces line–level signals to microphone–level range
• In–line XLR format with male input and female output connectors
• Passive design requires no power, batteries, or phantom voltage
• Metal housing construction for durability in live and studio environments
• Zero noise contribution maintains clean signal path throughout attenuation
• Direct cable integration eliminates need for adapters or custom wiring
• Prevents preamp clipping when connecting line–level sources to mic inputs
• Compact form factor fits standard XLR cable runs without bulk