The Trombone UM-40 UM4-40 (Model 223946) is a rack-mounted power amplifier designed for public warning and music broadcasting systems. It operates on external power sources of 24V and 220V.
This 19-inch amplifier provides 20 watts of output power and features two microphone inputs and one line input with voltage options of 30V or 120V. It also supports low-resistance output connections.
For technical purchases, confirm that Trombone UM-40 UM4-40 223946 fits the required application and field conditions.
Check the model information, category placement, and available product details before final selection.
This item appears in Public Warning Systems, Music Broadcasting, where buyers can compare related technical products for US projects.
For new installations, review the equipment schedule, site conditions, and related accessories before choosing the final item. That extra check is useful for contractors, maintenance teams, and technical buyers evaluating Trombone UM-40 UM4-40 223946 under project deadlines.
Reviews: 2
Average score: 5
Electrical Contractor
03/11/2025
Installed the Trombone UM-40 UM4-40 in a public announcement setup. The dual mic inputs and line input voltage options made integration straightforward. It handles 20 watts cleanly and the rack mount fits nicely in our standard 19-inch frame. Runs well on both 24V and 220V power sources as specified. Good choice for straightforward PA needs without overcomplication.
Electrical Contractor
13/07/2025
The Trombone UM-40 UM4-40 amplifier performed reliably during our recent installation at a municipal facility. Its dual mic inputs and line input voltage options gave us flexible connectivity. The rack-mount design fits well in standard cabinets, and the 20-watt output is sufficient for small to medium-sized areas. Setup was straightforward, and it handled low-resistance outputs without issues.
Questions: 3
Safsale Product Desk
04/04/2026
Can this amplifier be considered for replacement if dimensions match existing equipment?
The administration's response:
If the amplifier’s rack-mount dimensions and electrical specifications match the existing equipment, it may be considered as a replacement. It is important to compare the full model number, input/output configurations, and power requirements before finalizing the replacement decision.
Safsale Product Desk
11/03/2026
What information from the datasheet matters most?
The administration's response:
The main points to compare are the complete model number, size, rating values, material or finish notes, mounting style, and any connection details shown by the manufacturer. These checks help confirm whether Trombone UM-40 UM4-40 matches the required product specification.
Safsale Product Desk
04/07/2025
Is the short product title enough for final selection?
The administration's response:
The short product title is not enough for final selection. Use it as a starting point, then compare the full model reference, datasheet values, dimensional notes, and any manufacturer details before placing an order.
