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Deposition Sound FDM4

FDM4

Compact bookshelf speakers

Small footprint. Big personality.

A compact introduction to printed audio. A wide soundstage, deep bass, and a distinctive curved cabinet make the FDM4 at home on your desk or bookshelf.

The FDM4 is our most accessible 3D printed loudspeaker yet.

We literally crammed everything that we learned from the FDM5s and FDMGeos into this unsuspecting package.

If you're ready to bring wide sound stage and deep bass to a desktop setup, these speakers are just right for you.

Community FDM4 Builds

FDM4 in green glitter PETG with clear white accents rings
No items found.
Front of FDM4 Loudspeaker in Polymaker Wine Red and White
Side View of FDM4 Loudspeaker in Polymaker Wine Red and White covered in stickers
Side of FDM4 Loudspeaker in Polymaker Wine Red and White
Rear and bottom of FDM4 Loudspeaker in Polymaker Wine Red and White
No items found.
FDM4 in White with Black Accents PETG
Rear of FDM4 in White with Black Accents PETG
Bottom of FDM4 in White with Black Accents PETG
No items found.
American Flag
Speakers are designed and tested in the USA. Crossovers are sold by Matt Grant, with Deposition’s blessing — not by Deposition. Shop link coming; use Contact until then. Notify Deposition only for orders over 10.
PCBs built by MTG Designs

Crossover Design

FDM4 Crossover
Heavy gauge air core inductors, precision audio grade resistors, high purity metallized polypropylene capacitors, precisely machined and soldered PCB

Smooth 12dB, 2nd order filters placed at 4 kHz

Tuned to reduce listening fatigue, emphasize low end extension, and express top end detail.

Compact 4-inch woofer

FDM4 Woofer
Treated paper cone

Efficient motor design despite its small size

Excellent power handling for deep rich bass

"Itty Bitty" Dome Tweeter

FDM4 Tweeter
Compact neodymium motor design with ferrofluid damping
‍
When in concert with our wave guide, this tweeter sings on axis and way off axis

A 35-inch serpentine port

FDM4 Cabinet
A massive 35 inch (89 cm) serpentine port is merged with the cabinet side walls and rear baffle, adding structural stiffness and extended bass
‍
The unique shape is a standout feature, sure to start a conversation about 3D printing and audio

Get to know the FDM4.

FDM4 Frequency Response

FDM4 Frequency Response

FDM4 Impedance

FDM4 Impedance
Note: Measurement mic placed 39 inches (1.0 m) away from front baffle, on axis with the tweeter, atop a 36 inch (0.9 m) speaker stand, in a small bedroom. Frequency response plot is truncated below 200 Hz as this range tends to be room-dependent.

Model

FDM4

Design

2-Way Bass Reflex
(Semi-Transmission Line)

Woofer

4" Treated Paper Woofer

Tweeter

5/8" Neodymium Dome Tweeter

Crossover Frequency

4 kHz

Frequency Response

60 Hz - 20 kHz (±5 dB)  

Box Tuning Frequency

40 Hz

Power Range

30-40 W

Nominal Impedance

10 Ω

Sensitivity

82 dB

Weight per Speaker

4.1 lbs

Dimensions (H x W x D)

8.50" x 6.00" x 9.00"

Bill of materials

Quantities below are for one speaker, copied from the FDM4 assembly guide. Print the cabinet parts from the zip. Crossover PCB: buy from Matt Grant, with Deposition’s blessing (shop link coming — Contact us until then). Notify Deposition only for orders over 10.

Crossover PCB: x1
Tweeter: x1
Woofer: x1
Binding Post Pair (Red & Black): x1
0.8 Ounces of Poly-Fil Stuffing: x1
Front Baffle: x1
Main Cabinet: x1
Accent Ring: x1
Wave Guide: x1
16 Gauge Wire, 12 inches long: x2
Small Female Terminal Plugs: x2
Large Female Terminal Plugs: x2
M3 Heat Set Threaded Inserts: x4
M3 x 12mm Flat Head Socket Cap Screws: x4
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