Henry Engineering MULTIPORT User Manual

g

HENRY ENGINEERING

TM

MULTIPORT

Multi-Format Audio Interface Panel

DESCRIPTION

The MultiPort panel is a utility interconnect device that facilitates interface between a studio or professional audio system
and external audio devices. MultiPort provides convenient access to system audio inputs and outputs, and allows
connection to digital and analog equipment at both professional and consumer signal levels. Digital I/O can be via either
the AES/EBU or S/PDIF standard. Balanced audio outputs are provided at +4dBu and -50dBu and also unbalanced at

-10 dBv. MultiPort can accept analog inputs at +4dBu (balanced) or -10 dBv (unbalanced). XLR, ¼” TRS, 3.5mm Mini
TRS, and RCA jacks are provided for interface. MultiPort is powered by an external AC power transformer, included.

INSTALLATION

MultiPort can be mounted in a rectangular cutout in studio cabinetry. The cutout should be 11” W x 2 1/2” H. (A rack-mount kit is
optionally available, for mounting MultiPort in a 2RU rack opening.) Audio and power connections to MultiPort are via three “euroblock”
connectors on the PC board, labeled “To Studio”, “From Studio” and “AES,PWR”. Wire the mating plugs according to the information
below. Note that the pins are numbered left-to-right, with the screws facing up.

503 Key Vista Drive

Sierra Madre, CA 91024

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Web: www.henryeng.com

TO STUDIO: This connector sends analog audio from MultiPort to

All analog wiring to/from MultiPort should be balanced, lo-z, at professional +4 dBu levels.

PIN 1 LEFT +
PIN 2 LEFT –
PIN 3 GROUND
PIN 4 RIGHT +
PIN 5 RIGHT –
PIN 6 GROUND

FROM STUDIO: This connector sends analog audio from
Pin assignments are identical to those shown above.

AES, PWR: This connector is for the AES digital input and output, and also the power input to MultiPort:

PIN 1 AES + OUTPUT AES digital audio output of MULTIPORT to
PIN 2 AES – OUTPUT
PIN 3 AES+ INPUT Studio AES output (e.g., output of digital D.A.) to MULTIPORT digital output connectors
PIN 4 AES – INPUT
PIN 5 POWER INPUT 12V AC input to MULTIPORT (This is also the ground of MULTIPORT internal circuitry.)
PIN 6 POWER INPUT 12V AC input to MULTIPORT

GROUNDING: Grounds of analog I/O connectors can be connected at both ends. Four “jumper pins” (JP1-JP4) allow the studio
equipment grounds to be connected-thru to the XLR Pin1 ground terminals. JP1 (L) and JP2 (R) connect MultiPort input connector
grounds to the grounds of studio input equipment. JP3 (L) and JP4 (R) connect the studio output grounds to the ground pins of
MultiPort output connectors. The AES input and output connections are transformer isolated; no ground connection is required.
(MultiPort metal panel is connected to Pin 6 of the “From Studio” connector.)

OPERATION:
For balanced Line analog inputs/outputs, use the “combo” jacks for inputs (TRS or XLR) and the male XLR output jacks.
For unbalanced “consumer” Line analog inputs/outputs, use the “RCA” phono jacks or 3.5mm TRS jacks. All line-level I/O is stereo.

For balanced Mic-level outputs, use the Mic Output jacks. Note that both the Mic outputs are monaural
and right studio outputs. The Mic Ground switch can be used to disconnect Pin 1 of the Mic output XLRs from the studio ground.

To feed a digital audio signal into MultiPort, use either the AES input (XLR) or the S/PDIF input (RCA). Do not use both input jacks at
the same time. MultiPort’s digital outputs are available on either the AES output (XLR) or S/PDIF output (RCA). The Digital Output
Select switch selects which output is active. Do not use both outputs at the same time.

The two digital Utility connectors can be used for pass-thru connections of USB and RJ45 cables. Note that the USB connectors are
reversible, and can be installed with either type of USB connector facing outwards. Either of these connectors can be field replaced
with Neutrik USB, RJ45 or IEEE-1394 (“Firewire”) connectors.

the studio (e.g., a DA output) to the MultiPort output connectors.

the studio, e.g., to a balanced Line input on a console.

1 2 3 4 5 6

Pins are numbered left-to-right,
with screws facin

studio, e.g., the AES input of a digital console

, and are summed from the left

UP.

Specifications subject to change without notice. Rev. 01/2010

5

4

3

2

1

P2

E1

E2

J1

L IN

2

D D

GND

T

3

R

S

1

R2 24.9K

E9

R5 4.99K

R1 24.9K

C2

30pF

ON

R4

12.4K

OFF

JP1

123

E3

E4

J2

R IN

C C

GND

2

T

3

R

S

1

R14 4.99K

R18 24.9K

R17 24.9K

C3

30pF

ON

OFF

R15

12.4K

JP2

123

B B

T1

TC-612

1 3

P3

AES OUT

AES IN

GND

AES I/O,
PWR IN

1

2

3

4

5

6

2 4

R72

56

-12V

C7

0.1uF

C1 30pF

R3

2

3

R6

R7

6

5

C4 30pF

R16

2

3

R13

6

5

C17

0.1uF

R70

110 1/4W

S/A SW

-

+

8 4

4.99K

4.99K

-

+

8 4

-

+

8 4

R12

-

+

8 4

12.4K

-12V

+12V

-12V

+12V

12.4K

-12V

+12V

4.99K

4.99K

-12V

+12V

+12V

0.1uF

E21

E20

1

U1A

NE5532

7

U1B

NE5532

1

U2A

NE5532

7

U2B

NE5532

R68 2.4K

6

-12V

+12V

-12V

+12V

-12V

-

2

+

3

+12V

7 4

U4
LM6181

C13

0.1uF

R9 47 1/4W

C14

0.1uF

R8 47 1/4W

C15

0.1uF

R11 47 1/4W

C16

0.1uF

R10 47 1/4W

R64 1.2K

R73
82

R74130

TO STUDIO

P1

2

3

1

5

6

4

1 3

2 4

110 1/4W

L-

GND

L+

R-

GND

R+

T2

TC-615

R75
120

FROM STUDIO

R67

150

R69
150

T3

TC-615

1 3

2 4

E17

1

2

4

5

3

6

J5

3

2

1

J6

2

3

1

C21

0.1uF

AES IN

E10R66

SPDIF IN

E11

AES OUT

E12

SPDIF OUT

E13

JP3

JP4

ON

ON

123

123

OFF

OFF

R22

24.9K

R20

4.99K

RP1A20K

1 2

RP1B20K

3 4

RP4A20K

1 2

RP4B20K

3 4

R21

24.9K

R19 4.99K

-

2

+

3

8 4

RP2B33.2

3 4

RP2A

33.2

RP2C33.2

1 2

5 6

RP5B33.2

3 4

RP5A

33.2

RP5C33.2

1 2

5 6

-12V
1

+12V

NE5532

+12V

-12V

R2347 1/4W

U3A

C20

0.1uF

C18

0.1uF

E5

L OUT

E6C19

R57

24.9K

R55

4.99K

R56

24.9K

RP1C20K

5 6

RP3B33.2

3 4

RP3A

33.2

RP1D20K

7 8

RP3C33.2

1 2

5 6

E14

RP4C20K

5 6

RP6B33.2

3 4

RP6A

33.2

RP4D20K

7 8

RP6C33.2

1 2

5 6

E15

R544.99K

-

6

5

-12V
7

+

+12V

U3B

8 4

NE5532

R5847 1/4W

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE 1/8W, 1%.

J3

J4

J7

J8

2

1

3

1

2

3

2

3

1

2

3

1

L OUT

R OUT

M1 OUT

M2 OUT

E7

R OUT

E8

A A

D1 1N4004

D2 1N4004

5

+

C5
1000uF 25V

C6

+

1000uF 25V

3

IN

GND

2

OUT

Q1
LM78L12

+12V

1

4

2 3

IN OUT

GND

Q2

1

LM79L12

-12V

E18

PWR LED

E19

R76 10K

TP1

1

TP2

+12V

3

TP3

-12V

1

Title

SCHEMATIC: MULTIPORT INTERFACE PANEL

Size Document Number Rev

B

6300 A

2

Date: Sheet

1

HENRY ENGINEERING

503 Key Vista Drive

Sierra Madre, CA 91024 USA

telephone - [phone]
FAX [phone]

1

11Tuesday, February 09, 2010

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