The Ultimate Support TSM-138MK is an internal metal socket mounting bracket designed for flat-bottom speaker cabinets without a built-in speaker stand socket. It installs inside the bottom of the speaker cabinet and creates a secure mounting point for compatible 1.375-inch (35 mm) speaker stand tubes.

Heavy-Duty Metal Construction

Built for dependable support, the TSM-138MK features a durable metal fitting with a 4-inch (102 mm) diameter and supports speaker cabinets weighing up to 150 lbs (68.2 kg). Its internal installation keeps the mounting hardware within the cabinet while providing a stable connection to a traditional speaker stand.

Easy Installation & Professional Integration

The bracket includes installation hardware for mounting inside a suitable speaker cabinet, making it a practical solution for custom enclosures, mobile PA systems, live sound setups, and installed audio applications. It allows compatible flat-bottom cabinets to be used with 35 mm speaker stand tubes without requiring a factory-installed pole socket.

Product Specifications:

Mounting Type: Internal Speaker Cabinet Mount

Compatible Cabinet Type: Flat-Bottom Speaker Cabinets

Speaker Stand Tube Compatibility: 1.375″ / 35 mm

Maximum Weight Capacity: 150 lbs / 68.2 kg

Construction Material: Metal

Socket Diameter: 4″ / 102 mm

Installation Location: Inside Speaker Cabinet

Mounting Hardware: Included

Built-In Cabinet Socket Required: No

Product Weight: 1 lbs

Product Dimensions: 4″ H 4″ W 6″ L