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Accuphase DF-65 Digital Frequency Dividing Network


DF-65 Digital Frequency Dividing Network

The Digital Frequency Dividing Network DF-65 harnesses the very best of digital technology in
every aspect, including a high-speed 40-bit floating point DSP. The standard unit configuration
supports signal processing for up to four-way systems. Highly accurate digital filters offer a choice
of 59 cutoff frequency points and up to 96 dB/octave attenuation. Integrated time alignment
function adjustable in 0.5-cm steps, and delay compensator for automatically offsetting any filter
circuit delays. Monophonic output mode provides high versatility for various configurations.

  • High-speed DSP realizes fully digital signal processing in channel divider units
  • Standard configuration allows 4-channel (4-way) system setup
  • 59 selectable cutoff frequency points
  • Highly accurate 96 dB/oct attenuation slope
  • Time alignment function allows delay time setting in 0.5-cm steps
  • Delay compensator offsets signal delays in filter circuitry
  • Further refined MDS++ D/A converter
  • Selectable monophonic output mode for further enhanced specifications

Download the Brochure here.

Download the Fact Sheet here.


Digital Inputs

Format: IEC 60958/AES3 compliant

Sampling frequencies 32 kHz to 192 kHz (16 to 24 bits, 2-channel PCM)


Format: JEITA CP-1212      

Sampling frequencies 32 kHz to 96 kHz (16 to 24 bits, 2-channel PCM)


Connector: RJ-45, HS-LINK cable


Ver. 1 Sampling frequencies 32 kHz to 192 kHz (24 bits, 2-channel PCM)

Ver. 2 Sampling frequencies 32 kHz to 384 kHz (32 bits, 2-channel PCM)
(352.8 kHz and 384 kHz are converted to 176.4 kHz and 192 kHz respectively.)

Analog Input
 Maximum Input Level  3.7 V (1 kHz, 2.5 V output)
Input Impedance
BALANCED: 40 kilohms
LINE: 20 kilohms
A/D converter
Principle 1-bit delta sigma modulation
Sample Frequency 176.4kHz
Quantization 24bitz
Digital Output
 HS-LINK Connector: RJ-45, dedicated HS-LINK cable
Frequency Response

2.0 to 50,000 Hz            
+0             –3 dB

D/A Converter
32 bits
STEREO Operation
4MDS++ type
MONO Operation
8MDS++ type
THD 0.0007% (20 to 20,000 Hz)
S/N Ratio
  STEREO Operation MONO Operation
HS-LINK 121 dB 123 dB
Analog Input 116 dB 117 dB
Dynamic Range 118 dB
Channel Separation 108 dB (20 to 20,000 Hz)
Slope Characteristics

6 dB/octave,   12 dB/octave,  18 dB/octave

24 dB/octave, 48 dB/octave, 96 dB/octave          

*When cutoff frequency is 10 Hz: 48 dB/octave, 96 dB/octave not available

20 Hz: 96 dB/octave not available

Delay (converted into distance)

0 to ±3,000 cm (0.5-cm steps)

* Independent settings for left and right possible.
* Delay value range limit (absolute value) for all channels is 3,000 cm

Level Adjustment Range
"Analog ATT" OFF: –40 to + 12.0 dB (0.1-dB steps) 
"Analog ATT" ON: –50 to + 2.0 dB (0.1-dB steps)

*Independent settings for left and right possible.

Output Impedance

2.5 V, 50 ohms, balanced XLR connector
2.5 V, 50 ohms, RCA-type phono connector
Minimum Load Impedance
Power Requirements 120/220/230 V AC, 50/60 Hz
Power Consumption 31 watts
Maximum Dimensions

Width 465 mm (18.31˝)

Height 151 mm (15.95˝)

Depth 396 mm (15.59˝)


15.1 kg (33.3 lbs) net

21.0 kg (46.3 lbs) in shipping carton

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