● 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 ● Timealignment 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

Multi-channel divider with fully digital signal processing realizes theultimate in audio enjoyment with outstanding performance, sophisticated features and intuitive operation

The filter attenuation characteristics can be set to 6 dB, 12 dB, 18 dB, 24 dB, 48 dB, or 96 dB
per octave. The 96 dB/octave setting in particular allows the driver unit to reproduce only its
intended frequency without being affected by adjacent frequency bands. This makes it
possible to create a multi-amped system that takes musical accuracy to a wholly new level.
PASS

PASS
6

−20

12

−30

6 d

ct

dB/o

t

12

dB

c
/o

–50
−60

B/o

−40

ct

0
−10

ct

ct

−80

ct

/o

t

−70

B/o

dB

ct
t
/o
oc
dB dB/
24

40
71
125
224
355
710
1250
2240
4000
8000
14k

18

10
20 31.5 35.5
45
50
56
63
80
90 100 112
140 160 180 200
250 280 290 315
400 500 560 630
800 900 1000 1120
1400 1600 1800 2000
2500 2800 3150 3550
5000 5600 6300 7100
9000 10k 11.2k 12.5k
16k 18k 20k 22.4k

[dBr]

ct

Cutoff characteristics: –3.0 dB, 59 points

48 d

Built-in cutoff frequencies (Hz)96 dB/oThick aluminum top plate withelegant hairline finish■ Six filter slope characteristics with up to 96 dB attenuation per octave

B/oc

Assembly with high-speed DSP chip

Filter frequency points can be set over the range from 31.5 Hz to 22.4 kHz in 1/6-octave
intervals. In addition, 10, 20, and 290 Hz points are also provided, resulting in a total of 59
points. Each divider unit is fully flexible and allows independent selection of lower andupper cutoff frequency.

48 dHigh-speed 40-bit
floating point DSP■ 59 selectable cutoff frequency points

96 dB/oDesigned to serve as the core component of a multi-amped system, thechannel divider DF-65 features high-speed digital signal processing withamazing power. Latest digital circuit topology and advanced technology cometogether in a floating-point DSP that has a 32-bit mantissa and 8-bit exponent
section, serving as digital filter. The division into mantissa and exponent
prevents errors even when handling very small values.
This results in dramatically improved dynamic range and superior precision,
allowing very steep cutoff slope settings of 48 dB or 96 dB per octave. Allother functions including phase, delay, and level control are also
implemented in the digital domain. The result is ultra-precise filtering freefrom adverse effects by temperature changes or aging.

18
dB dB//oc octt■ High-speed, high-precision DSP implements fully digital signal processing

24

Innovative Technology

The Digital Frequency Dividing Network DF-65 harnesses the very best of digital technology inevery 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 choiceof 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.

−90
−100
10

20 30

50 70 100

200

500

Frequency

1k

2k 3k

5k 7k 10k

[Hz]

Divider unit slope characteristics (bandpass filter)(Cutoff frequency setting 100 Hz for lower and 1 kHz for upper range)

Advanced Features

I-V(Reverse phase
output)

DAC 2

I-V

＋
－

I-V

DAC 3

DAC 4

Subtraction

DAC
outputI-V

Current
summing

VoltagesummingTime Alignment Principle<Time alignment using delay>t seconds t seconds

d cm

Delay function
delays Ⓗ
waveform byt seconds

Delay
H

Delay

H

⇨ TimeL

Left: Normal phase, Right: Inverted phase
Left: Inverted phase, Right: Normal phase■ Memory feature allows saving and recalling
function settings.
■ System backup function allows returning theentire system to a previous condition.
■ Safety Lock prevents inadvertently changing any
settings.

■ Time alignment function allows delay
adjustment in 0.5-cm steps
The DF-65 incorporates a DELAY function thatuses digital signal processing to electrically adjust
the time when the sound from each driver reaches
the listener. Normally, a delay would be expressed
as a time value, but since the delay here is causedby spatial distance, the DF-65 converts it into a
distance value (cm) for display.

■ Display indication can show predefined strings orcustom strings entered by the user (max. 8 characters, character set 97 characters).
■ Elegant side panels with natural wood grain finish■ Digital attenuator with setting range from –40.0 dB
to +12.0 dB (in 0.1dB steps) allows precise leveladjustments for left and right channels.

■ Versatile choice of input connectors:
Coaxial, optical, and /HS-LINK for digital signals
Line and balanced for analog
signals

Start time
Delay ensures that Ⓛ andⒽ signals arrive at the ear
at the same timeSound sources (diaphragms)
of speaker units Ⓛ and Ⓗ are
d centimeters apart

Left/Right: Inverted phase■ "Analog ATT" function can be activated forspecific channels to reduce residual noise whenusing high-efficiency speaker units (ON: –10 dB).

Input
L

Left/Right: Normal phase

MDS (Multiple Delta Sigma)
is a revolutionary design that
employs multiple delta-sigma type D/A converters
connected in parallel, fordrastically improved performance. In the DF-65, fourHyperstreamTM DAC chips (ES9018S made by ESS
Technology) of the latest generation are driven inparallel. Compared to a single converter, thisresults in an overall performance improvement by afactor of 2 (= √4).

(Normal phase I (current) / V (voltage)
output)converter

DAC 1■ Independent phase switching for left and rightchannel (4 patterns).

■ High-performance HyperstreamTM DAC used for
MDS++

Block Diagram of MDS++ Converter■ "Full Level Output Protection"function safeguards the speakers
if a digital signal without volume
control data is input (Output levelis reduced to –40 dB).

Reference
Speed of sound = 331.5 + 0.607 T [m/sec] T: temperature (°C)
Consequently, at 20°C, sound travels at about 343.5 m/sec.
In the example above, when the DELAY function for Ⓗ is set to d cm,
the signal start for Ⓗ will be delayed by t = d/34,350 seconds,
causing the sound from Ⓛ and Ⓗ to reach the listener at the sametime.

Assembly with HS-LINK digital input and output connectors, line
input connectors, MDS++ D/A converters for 4 channels, line output
connectors etc.

Default settings of each unit
Function
Display indication

LOWER FREQUENCY UPPER FREQUENCYLOWER SLOPEUPPER SLOPE

Factory default: L=R

Factory default: L=R

LEVEL simultaneous mode DELAY simultaneous mode

■ Unused divider units can be set
to OFF (all display elements and
LED indicators are out).

DELAY COMPPHASEOUTPUTASSIGNMENT

MODE● ( ) symbol at top right of level indication is shown when
"Full Level Output Protection" function is set to ON.

Delay compensator function of DF-65 (providing automatic compensation for signal delays)＜Operation principle of delay compensator＞[Channel A]

Time lag (delay) of
output signal with regard
to input in each channel

DELAY COMP
function
ON/OFF

Using the slowest ⓐ asreference (0), ⓑ is delayed

When OFF,ⓐ is slowest,
delayed by t 2
seconds versus ⓑ

Output ⓐ0(ⓐ compensationtime)[Channel A]

Delay: t 2 s(Low-pass filter)
Input

When a signal passes a filter circuit, a delaynecessarily occurs. The "DELAY COMP" function
compensates for such delays. The illustration atleft uses a 2-way system as an example to show
how the delay compensator works.
■ Regardless of whether a circuit is analog ordigital, when the signal has to pass through afilter, the output will be delayed by a certain
amount, causing a delay in step response
and impulse response.
■ Generally, a low-pass filter will have more
delay. The DF-65 therefore only provides
compensation when low-pass filtering is used.
■ The lower the filter frequency and the steeper
the filter slope, the longer the delay.

DELAY COMP function ON

When
ON/OFF

When ON

When OFFⓑ is delayed by t2 seconds[Channel B]
ON/OFF

Output ⓑ

Delay: 0 s[Delayed by t 2 seconds
when ON]t2

t2(ⓑ compensationtime)[Channel B](High-pass filter)
When passing throughthe different filter circuits,
the signals will be delayed
by a certain amount ascompared to the input.

HS-LINK

When DELAY COMP is
ON, the time difference
between output signals ⓐand ⓑ is eliminated.

When DELAY COMP isOFF, the output signals
in each channel will betime-shifted due to thedelay.

Channel A

HS-LINK
ReceiverCoaxial

CoaxialReceiver

Encoder

MicroComputer

theoretical delay time, and automaticallyprovides compensation. (Default setting)OFF ：The DF-65 calculates and displays thetheoretical delay time for reference, and theuser can manually set any desired value.

MDS＋＋
D/A Conversion System × 4

Display

DSP: Digital Signal Processor
DigitalInputs

ON ：The DF-65 calculates and displays theActual delay compensatorindication is in cm, converted
from the above compensation
time value.

Floating Point

Digital Filter

DAC

BufferAnalogAttenuator
ON/OFF

Left
AnalogOutputs

DSP

BufferMaster Level
Frequency
Optical

OpticalReceiverDate/ClockDistributor

Level

Phase

Slope

Delay

Delay Comp

OutputBalanced

A/D
Converter

AnalogInputsDAI
Decoder

Balanced

HS-LINK

DF-65 Block Diagram

HS-LINK
Transmitter

Mono
ON/OFFMDS＋＋
D/A Conversion System × 4
Digital Filter

DAC

BufferLine

AnalogAttenuator
ON/OFF

Right
AnalogOutputs
BufferCoefficient
MemoryBalanced

Line

DigitalOutputLine

Channel B

Same as Channel A

Channel C

Same as Channel A

Channel D

Same as Channel A

Divider units (common design for all 4 units)

Center unit

Usage examples of DF-65 in monophonic mode
■Each divider unit can be set to one of four output
modes: STEREO , MONO L+R , MONO L , MONO R

LOWER FREQ

When one of the MONO positions is selected, theDAC output for the left and right channel circuits in theunit are combined and driven in parallel, which can beused to achieve a further reduction of residual noise.

UPPER FREQ

Lower cutoff frequency (Hz)Upper cutoff frequency (Hz)

LOWER SLOPEUPPER SLOPE

Lower cutoff slope (dB/oct)Upper cutoff slope (dB/oct)＜Usage examples of DF-65 in monophonic mode＞

DELAY

LEVEL

Channel delay expressed as
distance (cm)＊ Default setting:
L=R simultaneous mode

Channel level (dB)
＊ Default setting:
L=R simultaneous mode

DELAY COMP

PHASE

Delay compensator

Phase selector

OUTPUTASSIGNMENT

Output ON/OFF

Character display, OFF setting

MODE

Display

Output mode STEREO,MONO L＋R,
MONO L,MONO RFUNCTION

ENCODER

Parameter selector knob
(Turn the knob to bring up
available settings andindications on the display.
Push the knob to accept thecurrently shown setting.)

Function selector knob
(Turning the knob will cause
LEDs ① to ⑩ to light up in
sequence.)

Intuitive
andinnovative operation

Turn the FUNCTION knob A to select an itemfrom ① to ⑪.
Turn the ENCODER knob B to bring up a value or setting
on the display C, and push the knob to accept it.

❶ 2-way system with right/left in monophonic modeThis setup uses the four divider units of a single
DF-65 for a 2-way system, with two units set to"MONO L" and the other two units set to "MONO R".

LOCKED

Lights up when the unit
settings are locked.

INPUT

Cutoff frequencies Cutoff frequencies

The LED corresponding to the selected
input lights up.

For leftchannel

MEMORY

Channel A

Input selector knob

MEMORY

Memory selectorknob

Turn the INPUT knob to select an input(respective LED lights up).
Turn the MEMORY knob to select a memory
number from 1 to 5, and push the knob to performsave or recall.

Rear Panel
Digital output
HS-LINK

Channel D

MEMORY selector knob
INPUT selector knob

Power switch

DF-65
Channel C Channel D
MONO R❷ Subwoofer (3D) system
Mixing the ultra-low frequency signals of the left andright channel can be used to improve performanceof a system with a single subwoofer. Set the output
mode for channel A to "MONO L+R".
❸ 2-way to 4-way system with two DF-65 inmonophonic mode
Setting the divider units of the first DF-65 to "MONO L"
and the divider units of the second DF-65 to "MONO R"
allows multi-amping for a 2-way to 4-way systemusing the monophonic specifications.

INPUT

Divider units
Channel C

Channel A Channel B
MONO L

Preamplifier R

Input indicators
The LED for the selected input lights up

Channel B

Low High For right
range range channel

L

Shows the selected
memory number andindications for saving/recalling a setting.

Front Panel
Memory display
Shows the selected memory
number and save/recall information

Low High
range range

ENCODER parameter selector knob
FUNCTION selector knob

Analog outputs(LINE/BALANCED)
Channel Channel Channel Channel
DCBAAC power supply ★
connector

Analog inputs
LINE / BALANCED
Digital inputs
HS-LINK / COAXIAL / OPTICAL

Guaranteed Specifications [Guaranteed specifications measured in compliance with JEITA standard method CP-2150]
Digital Inputs
COAXIAL Format:
IEC 60958/AES3 compliant
Sampling frequencies 32 kHz to 192 kHz (16 to 24 bits, 2-channel PCM)
OPTICAL Format:
JEITA CP-1212
Sampling frequencies 32 kHz to 96 kHz (16 to 24 bits, 2-channel PCM)
HS-LINK
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 Inputs

Maximum input level
Input impedance
A/D converter

Digital Output

HS-LINK

Connector: RJ-45, dedicated HS-LINK cable

Frequency Response
2.0 to 50,000 Hz
D/A Converter

3.7 V (1 kHz, 2.5 V output)
BALANCED: 40 kilohms
LINE:
20 kilohms
Principle:
1-bit delta sigma modulation
Sampling frequency:
176.4 kHz
Quantization: 24 bits

+0

Quantization:–3 dB
32 bits

STEREO operation: 4MDS++ type
MONO operation:
THD

8MDS++ type0.0007% (20 to 20,000 Hz)

S/N Ratio

COAXIAL/OPTICAL
HS-LINK
Analog Input

STEREO operation MONO operation
121 dB
123 dB
121 dB
123 dB
116 dB117 dB

Dynamic Range

118 dB

Channel Separation

108 dB (20 to 20,000 Hz)

Slope Characteristics

6 dB/octave,
24 dB/octave,

12 dB/octave, 18 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 Voltage/Output Impedance
BALANCED: 2.5 V, 50 ohms, balanced XLR connector
LINE:
2.5 V, 50 ohms, RCA-type phono connector
Minimum Load Impedanc

BALANCED/LINE 600 ohms

Power Requirements

120/220/230 V AC, 50/60 Hz

Power Consumption

31 watts

Maximum Dimensions

Width
HeightDepth

Mass15.1 kg (33.3 lbs) net
21.0 kg (46.3 lbs) in shipping carton

465 mm (18.31˝)
151 mm (15.95˝)
396 mm (15.59˝)

Remarks★ This product is available in versions for 120/220/230 V AC. Make sure that the voltage shown on the rear panel matches the AC line voltage in your area.
★ The 230 V version has an Eco Mode that switches power off after 120 minutes of inactivity.
★ The shape of the AC inlet and plug of the supplied power cord depends on the voltage rating and destination country.

Supplied accessories● AC power cord
● Cleaning cloth●

The specifications and appearance of this product are subject to change without notice.

5年間保証

F1705Y PRINTED IN JAPAN 850-2204-00（B1）