INTRODUCTION:
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!
GETTING STARTED:
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 A-20 must only be used with the A-20 Control Amp, cables, and vice versa.
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 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.
Screws | Insulating |
| Washers |
A-20 | |
Amplifier | |
Front Panel | Rack Rail |
Fig. 1: Rack Mounting Detail
| +4 | | 1 | | MF |
+11 | -3 | | | | |
M | -10 | 2 | 0 | NF | FF |
SENSITIVITY | | BOUNDARY | | POSITION |
POWER
A-20ControlAmplifier
Signal flow 
To AC Line
Fig. 2 Typical System Configuration