Foam Speaker Port Bungs Bass Tuning Plug 35–65mm | Black

Foam Speaker Port Bungs – Tune Your Bass for Cleaner, Tighter Audio

Get the most out of your speakers with these high-quality foam speaker port bungs. Designed to insert into rear speaker bass ports, these cylindrical foam plugs help you fine-tune your audio system's low-frequency output — reducing boomy, muddy bass and delivering a cleaner, more balanced sound. Available in five sizes to suit a wide range of speaker port diameters.

Key Features

• Premium Open-Cell Foam: Crafted from durable, high-quality open-cell foam that provides consistent acoustic damping while maintaining long-lasting performance.
• Optimize Bass Response: Insert into your speaker's rear port to tune the low-frequency output, tighten up boomy bass, and balance the overall frequency response for improved audio clarity.
• Ideal for Near-Wall Speaker Placement: When your speakers must sit closer to a wall than ideal, these bungs minimize unwanted bass buildup caused by boundary reinforcement.
• Multiple Sizes Available: Choose from 35mm, 44mm, 55mm, 60mm, or 65mm diameter options to match your specific speaker port. Tip: Select a size slightly larger than your port diameter for a snug, secure fit.
• Easy to Install & Remove: No tools needed — simply compress and insert the bung into the port. Adjust or remove anytime to experiment with different tuning levels.
• Discreet Black Finish: The matte black color blends seamlessly with most speaker enclosures for a clean, professional look.

Specifications

Size Selection Guide

We recommend choosing a bung that is 1–2mm larger than the measured inner diameter of your speaker port. The foam compresses slightly for a secure, rattle-free fit. A bung that is too small may not seat properly and could fall out during use.

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Note: Actual color may vary slightly from images depending on monitor settings. Please allow ±1–2mm measurement tolerance.

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Frequently Asked Questions

Q: What sizes of foam speaker port bungs are available?

A: These foam speaker port bungs are available in five diameter sizes: 35mm, 44mm, 55mm, 60mm, and 65mm. Each size also has a corresponding height (50mm, 65mm, 50mm, 60mm, and 60mm respectively) to fit a variety of speaker enclosure port designs.

Q: How do foam speaker port bungs improve audio quality?

A: Foam speaker port bungs work by partially or fully blocking the rear bass port of a speaker enclosure. This reduces over-emphasized, boomy low frequencies and tightens up the bass response, resulting in a cleaner and more balanced overall sound — especially beneficial when speakers are placed close to walls.

Q: How do I choose the right size foam bung for my speaker?

A: Measure the inner diameter of your speaker's port tube, then select a foam bung that is 1–2mm larger than that measurement. The open-cell foam compresses slightly for a snug, secure fit. If you are between sizes, always go larger rather than smaller.

Q: Can I use these foam bungs with any speaker brand?

A: Yes. These foam speaker port bungs are universal accessories compatible with any ported (bass reflex) speaker enclosure — bookshelf speakers, floor-standing speakers, studio monitors, and more — as long as the port diameter matches one of the available bung sizes.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.