Rack Rail
A-20
Amplifier
Front Panel
Screws
Insulating
Washers
Fig. 1: Rack Mounting Detail
INTRODUCTION:
GETTING STARTED:
Thank you for your selection of the A-20. Your studio monitors are a critical element in the countless decisions made
during recording, mixing, mastering and other key aspects of audio production. They must deliver a transparent, neutral
and revealing assessment of sound, so that you have the information you need to choose and place microphones, set
Eq’s, balance mixes... In other words, deliver exceptional product. The A-20 is capable of state of the art sonic
resolution and flexibility. Investing time to learn about the A-20’s features and operation will reward you with the
best possible performance.
If you require assistance at any time during or after the setup process, call our Customer Service Hot Line at (800)-NHT-
9993 (648-9993). You can also visit our web site at www.nhtpro.com for more in depth technical information. Thanks
again for your confidence in our products!
The A-20 is unique in that it combines a dedicated control amplifier with loudspeaker monitor cabinets, using controlled
impedance cables that actually form part of the crossover network. By designing the system as an integral package in
this manner, many of the advantages of self-powered speakers can be realized without attendant performance compromises.
However, it must be recognized that the control amp, cables and monitors are an inseparable package.
The following are included in the Control Amplifier carton:
1 ea. - Control Amplifier
2 ea. - 20' Monitor Output Cables
1 ea. - 6' IEC Power Cord
4 ea. - 10-32 Rack Mounting Screws
1 ea. - Warranty Registration Card
8 ea. - Plastic Insulating Washers
The A-20 must only be used with the A-20 Control Amp, cables, and vice versa.
The A-20 Control Amplifier may be used on a shelf, or mounted in a standard 19” equipment
rack using the screws and washers supplied. For rack mounting, remove and retain the four
feet from the bottom of the amp chassis using a #2 Philips screwdriver. Two vertical rack
spaces are required, but we recommend you leave at least one additional open space
above and below the A-20 for improved cooling, as you would with any high power amplifier.
For table or shelf use, the four feet must remain attached to allow for air circulation. As a
starting point for speaker placement, align the back of the enclosures parallel to the rear wall,
with the angled fronts facing in towards you.
For
more detailed
speaker
placement
information see page 7.
Fig. 2 Typical System Configuration
M
POWER
SENSITIVITY
BOUNDARY
POSITION
+11
+4
-3
-10
FF
NF
MF
0
2
1
SPL
TMP
VAC
MODE
PHONES
A-20
Control
Amplifier
100
Signal flow
.
To AC Line
Signal flow
Signal flow
Monitor Output Cables
Corel
Jpg
