User Manual
Owner’s Manual
9
Owner’s Manual
HM Series Headphone Amplifiers: Front Panel Features
7. Power Switch and LED
Press the top of this rocker switch inwards to turn
on the HM Series Headphone Amplifier. The power LED
right above the switch will glow with happiness, or at
least it will if you have the headphone amp plugged in
to a suitable live AC mains supply.
Press the bottom of this switch in to turn the HM
Series Headphone Amplifier o. If the amp will not be
used for some time, we suggest unplugging the amp
from the AC outlet, too.
8. Genre Knob
Both the HM-400 and HM-800 have a genre knob on
the far lef of the front panel. It streams music through
the headphone outputs based on the chosen genre and
is typically used during breaks in the session. A really
cool feature about this is setting the knob between two
of the listed genres to hear a crossover of both... that
reggae-country sure is weird.
9. Meters
These seven-segment meters display the input and
output signal levels.
These meters should remain green with the
occasional bump into the yellow zone. If there is too
much yellow (or any red clipping), lower the input and/
or output knob(s) until it’s gone. You might check the
EQ settings, as well [HM-400].
Input and output meters (starting at the top):
OL, 0 dB, –6 dB, –12 dB, –18 dB, –24 dB and –30 dB
Both models have one input level meter.
The HM-400 has four output level meters
and the HM-800 has eight.
10. Main Level Knobs
The main knobs control the level of the signal
fed into the main input(s). This allows signals from
the outside world to be adjusted at optimal internal
operating levels.
The main input jacks on both models are on the
rear panel, although the HM-400 has an additional
1/4" main input jack on the front panel. There is
one main level knob on the HM-400 and two on
the HM-800.
11. 1/4" Headphone Output Jacks
The headphone output jacks on the front panel work
exactly the same as the headphone output jacks on
the rear panel. Please see call-out #3 on page 7 for a
description.
12. 1/4" Aux Input Jacks
Each aux input jack of the HM Series Headphone
Amplifier may be fed additional input stereo signals
from the aux outputs – also know as aux sends – from
an external mixer. The HM-400 has four of these aux
input jacks (on the front panel) while the HM-800
possesses eight of them (on the rear panel, see
call-out #6 on the previous page).
13. Phones Output Knobs
These knobs are used to adjust the volumes at
the phones outputs from minimum to maximum gain.
The HM-400 has four of these output knobs while
the HM-800 possesses eight of them.
WARNING: Yes, we just mentioned this
exact same warning a couple pages back,
but that is how important this is...the
headphone amp is loud, and can cause permanent
hearing damage. Even intermediate levels may be
painfully loud with some headphones. BE CAREFUL!
Always turn this control all the way down before
connecting headphones or doing anything new that
may aect the headphone volume. Then turn it up
slowly as you listen carefully.
dB
8
PHONES
OL
0
-6
-12
-18
-24
-30
STEREO
MONO
IN 1
IN 2
OUTPUT
dB
7
PHONES
OL
0
-6
-12
-18
-24
-30
STEREO
MONO
IN 1
IN 2
OUTPUT
dB
6
PHONES
OL
0
-6
-12
-18
-24
-30
STEREO
MONO
IN 1
IN 2
OUTPUT
dB
5
PHONES
OL
0
-6
-12
-18
-24
-30
STEREO
MONO
IN 1
IN 2
OUTPUT
dB
4
PHONES
OL
0
-6
-12
-18
-24
-30
STEREO
MONO
IN 1
IN 2
OUTPUT
dB
3
PHONES
OL
0
-6
-12
-18
-24
-30
STEREO
MONO
IN 1
IN 2
OUTPUT
dB
2
PHONES
OL
0
-6
-12
-18
-24
-30
STEREO
MONO
IN 1
IN 2
OUTPUT
dB
1
PHONES
OL
0
-6
-12
-18
-24
-30
STEREO
MONO
IN 1
IN 2
OUTPUT
LEVEL
MAIN 2
LEVEL
MAIN 1
dB
OL
0
-6
-12
-18
-24
-30
POWER
8
–
CHANNEL
HEADPHONE AMPLIFIER
GENRE
Blues
Funk
PopRap
Metal
Reggae
Country
79 10 13
15
11
14
98
dB
OL
0
-6
-12
-18
-24
-30
dB
OL
0
-6
-12
-18
-24
-30
dB
OL
0
-6
-12
-18
-24
-30
dB
OL
0
-6
-12
-18
-24
-30
dB
OL
0
-6
-12
-18
-24
-30
MAIN LEVEL
MAIN IN PHONES PHONES PHONES PHONES
INPUT LEVEL
BASS TREBLE
OUTPUT
BASS TREBLE
OUTPUT
BASS TREBLE
OUTPUT
BASS TREBLE
OUTPUT
ST.
2-CH
ST.
2-CH
ST.
2-CH
ST.
2-CH
L MUTE R MUTEL MUTE R MUTEL MUTE R MUTE L MUTE R MUTE
1 2 3 4
POWER
GENRE
Blues
Funk
PopRap
Metal
Reggae
Country
4
–
CHANNEL
HEADPHONE AMPLIFIER
79
10
98
14
1211 13
19
16
18
1717