Ditch the cables and insert a little style into your musical experience with the Koostik. Available in Walnut or Hard Maple, the Koostik naturally amplifies the sound coming from your iPhone 4, 4s or 5. You’ll get 2-4 times the volume without plugging anything into the wall. Made in the US by hand, the Koostik is a beautiful piece of craftsmanship and a useful desktop tool. Available in Original and Pivot styles.
Koostik Amplifier
More Home
Home
The Rug That Really Tied the Room Together Is Headed to Auction—And I Spoke With the Man Who Saved It
Nearly 30 years after The Big Lebowski, the film's rug is up for grabs.
Home
Our Favorite Finds From Bespoke Post’s Fourth of July Sale
Up to 50% off. These are the pieces we'd grab before they're gone.
Home
Black Book: 13 Products Our Editors Loved in June 2026
The products our editors have been obsessed with in June 2026.
-
Home
The Rug That Really Tied the Room Together Is Headed to Auction—And I Spoke With the Man Who Saved It
Nearly 30 years after The Big Lebowski, the film's rug is up for grabs.
-
Home
Our Favorite Finds From Bespoke Post’s Fourth of July Sale
Up to 50% off. These are the pieces we'd grab before they're gone.
-
Home
Black Book: 13 Products Our Editors Loved in June 2026
The products our editors have been obsessed with in June 2026.