Stewart Audio ADPT-SUM35 Stereo Female 3.5mm to Mono Male Euroblock

Convert Stereo Sources to Mono for Professional Audio Systems
The Stewart Audio ADPT-SUM35 is a stereo female 3.5mm to mono male Euroblock adapter, purpose-built for connecting consumer-grade stereo audio sources to professional audio equipment with balanced mono Euroblock inputs. This adapter automatically sums stereo signals down to mono, ensuring compatibility with commercial amplifiers, DSPs, and installed sound systems. It's a practical solution for integrating smartphones, tablets, computers, or portable media players into fixed audio installations.

Designed for Summing Stereo Signals to Mono
Many commercial audio systems operate with mono inputs, making direct stereo connections problematic without proper summing. The ADPT-SUM35 resolves this by internally summing the left and right stereo channels into a single mono output, preventing signal loss or phase cancellation. This ensures that both channels of the original signal are preserved and clearly represented through the system’s mono infrastructure.

Connect Consumer Devices to Commercial Installations
This adapter allows you to route audio from any device with a 3.5mm stereo output—like laptops, phones, or media players—into systems that use Euroblock inputs. It's especially useful in permanent installations such as classrooms, boardrooms, churches, and hospitality venues, where simple user devices often need to interface with complex AV infrastructure. The ADPT-SUM35 bridges that gap quickly and cleanly.

Compact and Installer-Friendly for Tight Spaces
The ADPT-SUM35 features a small, compact design that fits easily into rack spaces, wall plates, or behind mounted equipment. It requires no additional hardware, external power, or custom cabling, reducing setup time and cable clutter. Its plug-and-play approach helps system integrators work efficiently while maintaining professional audio standards.

Reliable Signal Summing with Passive Operation
As a passive device, the ADPT-SUM35 requires no power source and introduces minimal signal degradation. It's built for clear audio pass-through with internal resistance designed to maintain signal integrity while summing the stereo channels. This ensures consistent audio quality and signal levels in various application environments.

A Must-Have Tool for AV Integrators and Technicians
For AV professionals tasked with integrating modern audio sources into commercial systems, the ADPT-SUM35 is a practical and reliable tool. It eliminates the need for external summing boxes or complex wiring schemes, making it an efficient go-to accessory for quick conversions during installation or system maintenance.