Analog crossover network with "transfer function G=1" without phase rotation. [Slope characteristic -12 dB/Oct]. 2-way, 3-way, 4-way, and 3D configurations are available.

Active Crossover ACN400


"Transfer function G=1"

The -6dB/Oct is in phase, but you want to split with a steeper filter. However, if you increase the value to -12dB/Oct or higher, the phase does not match. Even if you reverse the polarity of the speakers or take time alignment, the phase does not match. The newly developed "MK Filter" eliminates phase rotation even at -12dB/Oct, freeing you from the difficulty of adjusting a multi-amp system.


Crossover frequencies that can be set


63, 100, 200, 400, FLAT


400, 630, 1000, 2000


2000, 4000, 8000, FLAT

  • The slope of each filter is fixed at -12dB. It cannot be changed to other slopes.

  • Analog type, no time alignment function is provided.

2-way or 3-way

It can also be used by specifying FLAT.

3D System

3D output + 3-way setting with 3D selection button


Resistor-switchable, adjustable from +0 to -30dB

Memory of settings

Up to 3 memory writes and recalls are possible.


Resistance switching ladder attenuator

In a variable resistor that slides on a resistor, noise is generated by a point-contact diode, which can be a source of distortion. This unit is a crossbar twin structure. A gold and platinum contact relay switches the resistance and attenuates.


Power supply for each left and right

A switching power supply that does not generate flux leakage and a fast-response dropper power supply are used to construct a highly stable power supply.


Unique transformers

A unique transformer placed in the signal path cuts noise and allows only the audio signal to pass through without adding anything extra. Both inputs and outputs are equipped with one XLR and one RCA each, and the use of transformers ensures perfectly balanced inputs and outputs.





CR type (MK filter) crossover network

Input/Output Terminal

Balanced, Unbalanced

Max. Input Voltage

3.0 V (Balanced, Unbalanced)

Max. Output Voltage

3.0 V (Balanced, Unbalanced)

Input Impedance (100 Hz-10k Hz)

3k Ω

Output Impedance (100 Hz-10k Hz)

300 Ω

THD (At 0.3 V output)

0.1 %/1k Hz or less

Frequency Response (4ch composite)

20 Hz-20 kHz +0 -2 dB


0 dB

Crossover Frequencies

Setting by pushbutton

Low/Mid-low range

63, 100, 200, 400, FLAT

Mid-low/Mid-high range

400, 630, 1000, 2000

Mid-high/High range

2000, 4000, 8000, FLAT

Slope Characteristics

-12 dB/Oct fixed

Signal to Noise Ratio

80 dB (Output 1.0 V, IHF-A corrected)


70 dB (Output 1.0 V, IHF-A corrected)

Level Adjustment

+0 dB~-8 dB

0.5 dB step

-8 dB~-13 dB

1 dB step

-13 dB~-16 dB

1.5 dB step

-16 dB~-30 dB

2-6 dB step

3D Output

Possible (Lch-Low, Subwoofer + 3Way)

Phase Setting

Not possible

Memory Write/Recall

3 memories

Mute Function

Possible (Per channel and all channels)

Display Adjustment

5 levels including lights out

Power Supply

AC100/117/220/240 V, 50/60 Hz

Power Consumption

60 W


470W×90H×350D mm


16 kg


Anodised aluminium


AC cords

Warranty Period

5 years

  • The input impedance of this unit is 3k Ω. Please use a equipment with an output impedance of 1k Ω or less.
  • The slope of each filter is fixed at -12dB. It cannot be changed to other slopes.
  • Dimensions do not include legs, knobs, or terminals.
  • The descriptions are current as of March 31, 2023.
  • The appearance and specifications are subject to change without notice.
  • Actual colors may differ from those in the photographs due to photography, lighting, etc.

A3-0.jpg A3-6.jpg A3-D.jpg