• -15%
Acoustic Diffuser MDD-400-16 up to 45% off
  • Acoustic Diffuser MDD-400-16 up to 45% off
  • Acoustic Diffuser MDD-400-16 up to 45% off
  • Acoustic Diffuser MDD-400-16 up to 45% off
  • Acoustic Diffuser MDD-400-16 up to 45% off
  • Acoustic Diffuser MDD-400-16 up to 45% off
  • Acoustic Diffuser MDD-400-16 up to 45% off
  • Acoustic Diffuser MDD-400-16 up to 45% off
  • Acoustic Diffuser MDD-400-16 up to 45% off
  • Acoustic Diffuser MDD-400-16 up to 45% off
Acoustic Diffuser MDD-400-16 up to 45% off

Acoustic Diffuser MDD-400-16

à partir de
55.00 € per pair
instead of 100.00 €

equivalent to a cost price of 27.50 € per diffuser



In the meantime, you can still place orders, but you will not receive your order until after August 15th.


Pair of acoustic diffusers consisting of one type A diffuser and its inverse type B. These two types are mutually mirrored with respect to each other, in order to avoid problematic phase correlations that occur when two identical elements are placed in proximity.

Each diffuser is composed of 20 pre-cut lines, to be assembled by placing them next to each other.

Discount on quantity
Number of pairs
Percentage discount
Pair price
85.00 €
75.00 €
65.00 €
55.00 €
Diffuser price
42.50 €
37.50 €
32.50 €
27.50 €
You save
15.00 €
50.00 €
105.00 €
270.00 €
Number of desired pairs

(4,8/5) out of 17 total ratings
Read the reviews
Andy Mac Door - The Best Diffuser at an Unbeatable Made in France Price

Three years of research were necessary to develop this revolutionary diffuser in terms of its efficiency and price. Nothing was left to chance in its design. Comprised of 400 "pseudo cells" on a stick in just 60cm², this French-designed and manufactured diffuser offers remarkable diffusion and dispersion properties, making it an essential reference.

Inspired by the QRD (quadratic residues) model, the PRD (primitive root) model, and the improved models LSD (Lüke sequence) and PWRD (power residue), the MDD (Mac Door Diffuser) sequence brings together the best of the most renowned sequences based on prime numbers to merge into a new formula patented in 2019, designed and optimized for stick diffuser designs.

This revolutionary sequence has the following characteristics:

  • DISTRIBUTING a different height per stick to spread the energy decay of the reflected wave as linearly as possible. This MDD model, composed of 400 sticks distributed in 20 columns and 20 rows, has 400 different heights.

  • REDUCING to the maximum negative phase correlations that produce irregularities in scattering, diffusion, and absorption by using a prime number per stick (patented formula by Andy Mac Door).

  • FAVORING the creation of real wells through the alternation of large and small sticks to approach the behavior of the theoretical model with cells created by walls, which is impossible in such a format. This further favors the accumulation of energy in the wells and optimizes energy decay.

  • DIVIDING the source wave into a large number of energy lobes over a wide frequency range by homogenizing phase correlations.

  • DISPERSING energy lobes symmetrically in a semi-spherical plane to preserve the spatial image of the room when the diffusers are positioned in a room dedicated to mixing or high-fidelity listening.

  • DISCARDING the need for 2D sequences based on prime numbers to use a different number of columns and rows (N-1) without compromising any acoustic properties.

  • AVOIDING resonances that can occur at certain frequencies (usually high) when diffusers are placed side by side and the energy lobes of neighboring cells correlate constructively.

Technical specification

Type of diffusion
Two-dimensional in half-sphere
Acoustic diffusion range
278 Hz - 14 768 Hz
Maximum cell depth
160 mm
Cell width
29.75 mm (on average)
Number of rod cells
None, each cell has its own height
Base height for assembly
17 mm
Raw material color
High-density extruded polystyrene
Fire reaction
Euroclass E
Weight of a diffuser
1,3 kg
Diffuser Dimensions (Width x Length x Height)
595 mm x 595 mm x 177 mm

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DIFFUSER - The quest for the best acoustic diffuser, pioneers and studies

3 years of research, over 6,000 hours of study, experimentation, questioning of what has already been done in terms of diffusion, and the creation of about sixty diffuser devices made with different materials and sequences in order to understand, find, and achieve the best acoustic diffusers, have led me to develop my own method for simulating the behavior of a diffuser, a demonstration method based on observing a 'ripple tank,' a serious questioning of the certainties we had about their behaviors, and finally, my own distribution method, which varies depending on whether the diffuser design is based on rods or wells.

DIFFUSER - With Sticks or Wells, which design is the most effective ?

When it comes to diffusers, "experts" generally agree on a preference for well-based designs over stick-based ones. However, my investigations have led me to the conclusion that, depending on the sequence type and implementation constraints, stick-based designs often yield better results when the number of cells is substantial. After selecting the diffusers (generated randomly using the "Mersenne Twister") that exhibit superior characteristics to QRD, PRD, LSD, and PWRD models, in line with the predictions of my analyzer using the "brute force" method, I set out to examine the similarities in their designs to identify the elements necessary for optimal diffusion.