Rolls HA43 - Introduction; Description of Components; Stereo Input; DC Power Input

INTRODUCTION
Thank you for your purchase of the HA43 Headphone Amplifier. The
HA43 will power four pairs of stereo headphones for high quality audio
monitoring. The unit is intended for sound reinforcement, studio, choir,
and other applications where a smaller size is desirable.
DESCRIPTION
STEREO INPUT: Stereo 1/4" TRS jack for connection to a stereo line-
level source. This jack may also be connected to a stereo headphone
output.
DC PWR: For connection to the power supply.
PWR LED: Indicates that the HA43 has power connected.
VOL1 - 4: Controls the level of the indicated channel output.
OUT1 - 4: 1/4" stereo TRS jack for connection to stereo headphones.
CAUTION: Plugging a mono 1/4" plug into the Headphone Outputs may
cause permanent damage to the unit. Use ONLY TRS stereo plugs in
these jacks.
PWR
VOL1 VOL2 VOL3 VOL4
HA43
STEREO
INPUT
DC PWR
OUT 1 OUT 2 OUT 3 OUT 4
STEREO
HEADPHONE AMP
SPECIFICATIONS
Input Impedance: 100K Ω unbalanced
Max Input Level: +14 dBV
Input Connectors: Stereo 1/4" TRS phone
Outputs: (4) 1/4" Stereo 1/4" TRS phone
Output Impedance: 51 Ω each output
Max Gain: 20 dB/Channel
S/N Ratio: >90 dB
THD: <.008%
IMD (SMPTE) <.008%
Power: 12 VDC adapter
Weight: 1 lbs (.45Kg)
Size: 3" x 4" x 1.25" (8 x 10 x 3.2 cm)
V+
6
5
7
8
U2B
4560
C5
25PF
4 6
5
P1B
P100K X2
R3
10K
V+
R7
100K
6
5
7
8
U1B
4558
4 6
5
P2B
P100K X2
R9
10K
C9
25PF
R4
10K
2
3
1
4
U2A
4560
1 3
2
P1A
P100K X2
C6
25PF
V-
J1
PHONE 1/4
R2
51
R1
51
C13
1000 UF
J2
PHONE 1/4
R6
51
R5
51
2
3
1
4
U3A
4560
1 3
2
P2A
P100K X2
C7
25PF
R10
10K
V+
6
5
7
8
U3B
4560
R8
100K
2
3
1
4
U1A
4558
V-
C4
.047
C3
.047
4 6
5
P3B
P100K X2
R13
10K
V+
6
5
7
8
U4B
4560
C10
25PF
V-
R11
51
R12
51
J5
PHONE 1/4
2
3
1
4
U4A
4560
1 3
2
P3A
P100K X2
C8
25PF
R14
10K
J6
PHONE 1/4
2
3
1
J3
JAPDC
V+
C1
1000 UF
R20
22K
D1
1N4001
4 6
5
P4B
P100K X2
R15
10K
D2
LDRR
V+
6
5
7
8
U5B
4560
C11
25PF
C12
25PF
V-
R17
51
V-
J4
PHONE 1/4
R18
51
2
3
1
4
U5A
4560
1 3
2
P4A
P100K X2
R16
10K
R21
10K
C2
1000 UF
R19
22K
V-
Date: June 8, 1994 Sheet of
Size Document Number REV
A HA43
Title
ROLLS 4CH HEADPHONE AMP HA43
ROLLS CORPORATION