INTRODUCTION

Thank you for your purchase of the Rolls HM57 Headphone Monitor Interface.

This unit connects four mono 1/4” input signals and two main stereo mix signals to

either the HM58 or HM59 Headphone Monitor Remote. All signals are controlled

from the Remote units.

INSPECTION

1. Unpack and inspect the HM57 box and package.

If obvious physical damage is noticed, contact the carrier immediately to make a

damage claim. We suggest saving the shipping carton and packing materials for

safely transporting the unit in the future.

2. Please complete the Warranty Registration Card and return it to the factory.

SPECIFICATIONS

Connectors: 8: 1/4” jacks, DB25 connector, Pwr jack

Power Requirement

: 12 Volts AC

Dimensions: 5.625”W x 3.275”H x 1.325”D

Weight: 1 lb.

DESCRIPTION

BACK PANEL

MONO INPUTS: 4: 1/4” TRS balanced inputs for connection to a mixer auxiliary

outputs or equivalent.

MAIN INPUTS: 2: 1/4” TRS balanced inputs for connection to a mixer right and left

sub outputs or equivalent. The Left input is used for a mono source and will feed

both sides.

AUX INPUTS: 2 inputs to be used as stereo effects returns, or as a second pair of

stereo inputs. The Right input is used for a mono source and will feed both sides.

The Left input is a TRS jack that will accept a stereo input on the Tip and Ring.

FRONT PANEL

EXPANSION: 24 pin female OUTPUT jack.

PWR: LED indicating power is connected to the HM57.

12-17 VAC: P o w er jack - connect to the Rolls PS12.

CONNECTION

Connect the HM57 power supply (the PS12) to an AC outlet and the HM57.

Connect the audio cables from the mixer to the unit as shown in the example

below. Connect the DB25 cable from the HM57 Expansion jack to the input

Expansion jack on the HM58 or HM59, whichever you are connecting your

headphone to. Refer to the HM58 or HM59 Owners Manual for their proper

operation.

AUXILIARY SENDS MAINOUTPUTSSUBOUTPUTS
MAIN MIXER
1234RL/MON
MAIN
INPUTS
R/MON L/ST
AUX
INPUTS
MONO
INPUTS
EXPANSION PWR
12 - 17
VAC
+
-
HM57 HEADPHONE MONITORINTERFACE

SCHEMATIC

1234RL/MONMAIN
INPUTS
R/MON L/STAUX
INPUTS
MONO
INPUTS
EXPANSION PWR12 - 17VAC+-
HM57

HEADPHONE

MONITOR

INTERFACE

1Rolls Corporation5143 South Main StreetSalt Lake City, UT 84107HM57.SCH26-Oct-1999Document Number:Date: Sheet ofFXa
PO W E R
LE FT MA IN /
RI GH T M AI N
VDD
VCC
VCC VDD
R1 0 6
10 K
6
5
7
8
U1 B
45 6 0
2
3
1
4
U1 A
45 6 0
D5
LD S G
C1 1
22 0 0 U F
C1 2
22 0 0 U F
1
14
2
15
3
16
4
17
5
18
6
19
7
20
8
21
9
22
10
23
11
24
12
25
13
J1 0
DB 25
R3
20 .0K 1%
R4
20 .0K 1%
R9
20 .0K 1%
R8
20 .0K 1%
R1
10 .0K 1%
R2 10 .0K 1%
R7
10 .0K 1%
R6
10 .0K 1%
VCC
VDD
6
5
7
8
U2 B
45 6 0
2
3
1
4
U2 A
45 6 0
R1 3
20 .0K 1%
R1 4
20 .0K 1%
R1 9
20 .0K 1%
R1 8
20 .0K 1%
R1 1
10 .0K 1%
R1 21 0.0 K 1 %
R1 7
10 .0K 1%
R1 6
10 .0K 1%
VCC
VDD
6
5
7
8
U3 B
45 6 0
2
3
1
4
U3 A
45 6 0
R2 3
20 .0K 1%
R2 4
20 .0K 1%
R2 9
20 .0K 1%
R3 2
20 .0K 1%
R2 1
10 .0K 1%
R2 2
10 .0K 1%
R3 1
10 .0K 1%
R3 0
10 .0K 1%
VCC
VDD
6
5
7
8
U4 B
45 6 0
2
3
1
4
U4 A
45 6 0
AU X 1
AU X 2
AU X 3
AU X 4
J7
J6
M O N O
M O N O
J1
J3
J2
J4
VCC
VDD
I
1
G
2
O3
U1 7
78 1 2
I
2
G1
O3
U1 8
79 1 2
C1 7
1U
C1 4
10 U
J9
J8
R4 0 2 2K
R3 6 2 2 K
R3 3
22 K
R3 9
22 K
R3 8
22 K
R3 5
22 K
R3 4
1K
R3 7
1K
C3 8 2 7 P F
C3 92 7 P F
C4 0 2 7 P F
C4 1
27 P F
C4 22 7 P F
C4 3 27 P F
C4 4 27 P F
C4 7 27 P F
C
D
E
F
G
H
D1
1N 4 0 0 X
D4
1N 4 0 0 X
2
3
1
J5
JA P DC
PH ON E 1/4
PH ON E 1/4
PH ON E 1/4
PH ON E 1/4
PC 1 /4
PC 1 /4
TI TL E: HE AD PH ON E MO N ITO R INT ER FA CE H M5 7
RE V
A
SI Z E
C6 2
503
R RE TU RN /
PH ON E 1/4
L RE TUR N/ TR S
PH ON E 1/4
1To HM58 or HM59