Love your JBL 4311/4311B/4312 speakers but always admired the iconic look of the L100?

Now you can have the best of both worlds without any modifications! Our transformation kit lets you instantly convert your speakers to embody the classic L100 design. Crafted with premium materials for a perfect fit, this set gives your speakers a striking, timeless style while preserving their superior sound quality.

Elevate your audio experience and showcase your passion for vintage design. Transform your JBL speakers into a true statement piece effortlessly.

The frames come with pre-installed Velcro on the back and a cutout for the tone control knobs.

You will receive one mini L100 speaker keychain in a random color for free!!!

You will receive the complete set:

• Pair of Madsumo Neutral Sound Quadrex grilles 

• Pair of American walnut 4311/4311B/4312 frames

• special double sided tape

• JBL emblems.

You will receive a fully assembled set, ready to be mounted to your JBL loudspeakers!

Please contact us with information what color of grilles do You want (Light blue, Dark blue, Deep blue, black, grey, brown, Burnt orange and Bright Orange).

Walnut wood It's natural material, so your speaker's wood may have a little different color or texture.

Why Our Foam Grilles Last for Years — The Importance of UV Protection

Unlike some cheaper alternatives made from polishing sponge materials (not the special acoustically neutral foam developed specifically for our company), our foam grilles are designed for speaker use and long-term durability.

One of the biggest differences is not just the foam itself, but also the professional UV-protective coating we apply. Our grilles are made using specialized sound-neutral foam, and then coated with a custom-developed UV-resistant finish.

Foam that is not coated will quickly degrade when exposed to sunlight — becoming brittle, discolored, and visually unappealing within just a few months. This is a common problem with materials not intended for speaker applications.

Thanks to our materials and UV coating, our grilles maintain their deep color, shape, and premium look for years, even in bright rooms or near windows.

When you choose our grilles, you're not only getting an authentic retro style — you're investing in a product built to last!!!

Our grilles are made from special sound neutral foam with open cells, so air and sound can move easily in both ways without any problems. These grilles pass all frequencies, don't block mids and highs unlike other grilles. Edges are not cutted unlike others grilles!!!

Cutting angles and dimensions are perfect with 0.08 radius between cubes.


We offer special stands for your loudspeakers, check our other listings or contact with us.

We are a real legal company from Europe, so you can always count on our help, you get an invoice from us and you can be sure that you are buying the highest quality product, not home-made low quality grilles.

We have 100% positive comments from satisfied customers!!!

Please be aware that the option to select different shipping methods might not be available when using mobile devices. To view all available shipping options, please access eBay from a computer. This will ensure you have the best choice for delivery that suits your needs. I appreciate your understanding!

Shipping time: 7-21 days.

Delivery time:

FedEx / UPS: 2-5 days only!