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1. INTRODUCTION
Thank you very much for expressing your confidence in LTO products by purchasing our HPA6 6-Channel Head-
phone Amplifier. With the HPA6 you have acquired an extremely musical and flexible 6-Channel Headphone Amplifier.
Featuring six stereo headphone amplifiers, The LTO HPA6 6-Channel Headphone Amplifier performs a number of
necessary tasks, not all of which are headphone related.
The HPA6 6-Channel Headphone Amplifier provides Main Inputs on the rear panel and Direct In Input on the front
panel to drive any or all of the 6 stereo headphone amplifiers, when using the Direct In Input, the Main Inputs signal
will be interrupted automatically, the Main Outputs on the rear panel can be used to interlink any number of HPA6s
for expanding. The AUX In input on each channel is used to add an additional input signal to the master signal, with
the corresponding Balanced Control to determine the mix ratio between the two signals.
In parallel with the Headphone Outputs on the rear panel, the Headphone Output on the front panel is also used to
output the signal of the individual channel.
2. FEATURE LIST
Signal Rack Unit
6 individual channels
Common input gain control, and individual output gain control
Up to 3 headphone outputs per channel
Direct In and Headphone Output on the front panel for easy operation, esp. used in the rack mounting application
Input and Output Level Meter
Balance Control to mix up the Main In and the Aux In signal
Main Outputs for chaining further HPA6 headphone amplifiers
Maximum audio quality even at high volume levels
Exceptionally rugged construction ensures long life and durability
Universal and professional headphone amplification system for studio and stage application
Manufactured under QS9000 certified quality system
Excluding 1 knob control, 1 jack and 8 LEDs for the common main section, the LTO HPA6 6-Channel Headphone
Amplifier also contains 3 Push-button switches, 2 knob controls, 2 phone jacks and 4 LEDs for each individual channel.
3. CONTROL ELEMENTS
3.1 The ront anelFP
1
2
4
9
7
8
3
24 18 12 60 6 12 18
INPUT LEVEL(dBu)
DIRECT IN
INPUT GAIN
MAIN SECTION
24 0 12
CLIP
OUTPUT LEVEL(dBu)
L MUTE R
BALANCED
AUX IN
OUTPUT GAIN
HEADPHONE OUT
CHANNEL 1
2
3
4
5
6
1
0
2
3
4
5
6
1
0
MONO
STEREO
R
LTO
MAIN IN
AUX
5
12
6 10
11
24 18 12 60 6 12 18
INPUT LEVEL(dBu)
MAIN SECTION
HPA6
6-Channel
HEADPHONE
AMPLIFIER
24 0 12
CLIP
OUTPUT LEVEL(dBu)
CHANNEL 1
24 0 12
CLIP
OUTPUT LEVEL(dBu)
CHANNEL 2
24 0 12
CLIP
OUTPUT LEVEL(dBu)
CHANNEL 3
24 0 12
CLIP
OUTPUT LEVEL(dBu)
CHANNEL 4
24 0 12
CLIP
OUTPUT LEVEL(dBu)
CHANNEL 5
24 0 12
CLIP
OUTPUT LEVEL(dBu)
CHANNEL 6
POWER
R
LTO
DIRECT IN
BALANCED
AUX IN
BALANCED
AUX IN
BALANCED
AUX IN
BALANCED
AUX INHEADPHONE OUT HEADPHONE OUT HEADPHONE OUT HEADPHONE OUT
INPUT GAIN
2
3
4
5
6
1
0
AUX
MAIN IN
1
OUTPUT GAIN
3
2
4
5
6
0
AUX
OUTPUT GAIN
2
3
4
5
6
1
0
OUTPUT GAIN
2
3
4
5
6
0
1
AUX
AUX
1
OUTPUT GAIN
2
3
4
5
6
0
L MUTE R
MONO
STEREO
L MUTE R
MONO
STEREO
L MUTE R
MONO
STEREO
L MUTE R
MONO
STEREO
MONO
STEREO
L MUTE R L MUTE R
MONO
STEREO
ON
OFF
BALANCED
AUX IN HEADPHONE OUT
MAIN IN
AUX
OUTPUT GAIN
2
3
4
5
6
1
0
BALANCED
AUX IN HEADPHONE OUT
MAIN IN
AUX
OUTPUT GAIN
2
3
4
5
6
1
0