Passive Concrete Phone Speaker / No-Power Phone Amplifier

This handcrafted passive concrete phone speaker naturally amplifies your phone’s sound — no electricity, no Bluetooth, no batteries required. Just place your phone in the slot and let the concrete do the work.

Designed to enhance volume and clarity, this speaker is perfect for desks, offices, kitchens, bathrooms, showers, workshops, or bedside tables. The dense concrete body helps project sound forward while boosting mid-range and lower frequencies better than most plastic alternatives.

Two Size Options Available

Small

• Approx. 4.5” cube

• Fits phones up to 3.5” wide

Large

• Approx. 4.75” cube

• Fits phones up to 3.75” wide (great for larger phones or cases)

Both sizes are compatible with most smartphones.

Features

✔ 100% passive — zero power required

✔ Naturally amplifies sound

✔ Heavy, stable concrete design

✔ Modern minimalist aesthetic

✔ Great gift idea

✔ Handmade — each piece is unique

Customization

Concrete color can be customized — message me before ordering to see what is in stock and discuss available options.

Because each speaker is handmade, slight variations in color, texture, and small air bubbles are normal and part of the character of real concrete.

Perfect For

• Office desks

• Bathrooms & showers

• Kitchens

• Workshops

• Gifts for tech lovers

• Minimalist or modern spaces