Ultimate Support
Ultimate Support TSM-138MK Speaker Cabinet Mounting Bracket
★★★★★
138 lbs
Securely Mount Speakers Without Built-In Sockets The Ultimate Support TSM-138MK is the perfect solution for mounting speaker cabinets on speaker stands when they lack a built-in socket. This internal metal bracket ensures a secure and stable setup. Specifications: Brand: Ultimate Support Model...
$49.99*
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*Price sourced from Amazon.com. Last updated:Jun 28, 2026.Price and availability are subject to change.
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Overview
Securely Mount Speakers Without Built-In Sockets
The Ultimate Support TSM-138MK is the perfect solution for mounting speaker cabinets on speaker stands when they lack a built-in socket. This internal metal bracket ensures a secure and stable setup.
Specifications:
- Brand: Ultimate Support
- Model: TSM-138MK
- Type: Mounting Bracket for Speaker Cabinets
- Compatibility: Speaker stands with 1-3/8" (35mm) tube
- Fitting Diameter: 4" (102mm) Flange
- Weight Capacity: 150 lbs (68.2 kg)
- Mounting: Internal metal bracket
Key Features
Secure Mounting: Internal bracket fits flat-bottom speaker cabinets.
Standard Compatibility: Fits 1-3/8" diameter speaker poles.
Compact Design: 4" diameter footprint for tight installs.
Heavy-Duty Fitting: Metal bracket supports up to 138 lbs.
Specifications
Mounting Type
Internal bracket for flat-bottom speaker cabinets
Compatible Pole Diameter
1-3/8"
Footprint Diameter
4"
Material
Metal
Weight Capacity
138 lbs
Pros & Cons
👍 Pros
- Ensures secure mounting for flat-bottom speaker cabinets, providing stability during use.
- Offers broad compatibility with standard 1-3/8" diameter speaker poles, making it versatile for many setups.
- Features a compact 4" diameter footprint, ideal for installations where space is limited.
- Constructed from heavy-duty metal, allowing it to support speakers weighing up to 138 lbs with confidence.
- Designed for internal installation, which can offer a clean and integrated look for speaker cabinets.
👎 Cons
- Only fits speaker cabinets with a flat bottom, which may limit its compatibility with certain speaker designs.
- The bracket is designed for a specific 1-3/8" speaker pole diameter, meaning it will not work with other pole sizes.
- Requires internal installation into the speaker cabinet, which may involve some DIY effort or modification.
- While it supports up to 138 lbs, users should verify their speaker weight is within this limit to ensure safety.
- The 4" diameter footprint, while compact, still requires a minimum amount of internal space within the speaker cabinet.
Frequently Asked Questions
What type of speaker cabinets is the Ultimate Support TSM-138MK designed for?
This mounting bracket is designed for flat-bottom speaker cabinets, providing a secure internal fit.
What size speaker pole does this bracket accommodate?
The TSM-138MK is compatible with standard speaker poles that have a 1-3/8" diameter.
What is the maximum weight capacity of this mounting bracket?
This heavy-duty metal bracket is built to support speaker cabinets weighing up to 138 lbs.
How compact is the design of this speaker mounting bracket?
It features a compact 4" diameter footprint, making it suitable for installations in tight spaces.
Is the installation of this bracket external or internal to the speaker cabinet?
The TSM-138MK is an internal bracket, meaning it fits inside the speaker cabinet for a secure mount.
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