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DE Plan 400

Invisible Speaker

Key Features
  • Invisible flat transducer

  • 180° nominal dispersion

  • Very linear frequency response

  • Small mounting dimension: 420 × 300 mm

  • 2 × 4" woofers + 1" high frequency driver

  • 160 watts power capacity

  • 8 ohms or 100 V versions

Fields of Application
  • Exhibitions, trade fairs
  • Gastronomy, hotels
  • Home audio
  • Museums
  • Surround systems
  • Sales rooms

The DE Plan 400® is a powerful, 2-way flat transducer which, once installed, remains completely invisible in walls or ceilings. The patented design concept of the DE Plan series enables the flat membrane to be homogeneously deflected. As a result, the DE Plan 400 has a very wide frequency range and excellent low frequency sound.

de:shape®: the membrane of the DE Plan 400 has an optimized contour with a calculated distribution of distance between the edge and the high frequency driver (patent pending). This results in unprecedented audio performance and extremely accurate sound reproduction.

Sophisticated crossover tuning means the DE Plan 400 gives a warm, clear sound and enables high-quality music and speech reproduction. As such, the DE Plan 400 is ideal for home audio systems, media rooms and the gastronomy sector. A wide dispersion angle of 180° means that sound is distributed homogeneously throughout the room with just a few speakers.

The DE Plan 400 is mounted facing outwards in hollow non-concrete walls and ceilings. It can also be installed in solid walls and concrete ceilings using an EGB Plan 400 back box. First, the speaker is mounted, then the glass fiber lining included with the package is placed around the membrane and the area can then be plastered and painted.

DE Plan Installation Videos with or without a back box on Youtube

Technical Data

2-way flat transducer


2 × 4" woofers + 1" high frequency driver

Frequency range
48 Hz – 20 kHz (2 × paint-coated)
8 Ohm
Power capacity
80 watts RMS, 160 watts program

82 db (1 W@ 1 m), half-space (flush-mounted)

Maximum SPL

104 dB @ 1 m

100 V Version: 100 dB @ 1 m

Dispersion angle (H × V)

420 × 300 × 72 mm

incl. mounting feets: 420 × 370 mm

Cutout size

424 × 304 mm

Wall / ceiling thickness
10 – 35 mm (incl. back box)
Installation depth
72 mm
3.9 kg
Screw-type terminals, pluggable
5 years
Datasheet (PDF)

DE Plan 400

Complete incl. assembly frame, glass fiber fabric and adhesive

DE Plan 400 T

100 V version

power 15/30/60 watts


EG Plan 400

Back box

Dim. 500 × 480 × 120 mm

EGB Plan 400

Back box for concrete

Dim. 500 × 480 × 148 mm (incl. PVC rigid foam)

Spare parts

MR 400

Assembly frame