NAD T 977 User manual

Our T 977 is an extremely powerful, high performance seven-channel power ampli er capable of delivering the musical muscle that serious movie
lovers demand. Along with NAD’s T 187 Surround Sound Preamp Processor, you’ll enjoy a sophisticated home theatre system that will rival gear
costing many times more. We doubt you’ll  nd anything that comes close to the T 977’s overall musical satisfaction, well-rounded performance, and
complete value.
> Powerful Impact
The T 977 unleashes 140 watts of continuous power and
fl exes its musical muscle with peaks of 1000 watts into seven
channels for an audio experience that simply has to be heard.
Thanks to its specially designed Holmgren Torodial power
supply, the T 977 will never come up short in power, handling
even the most demanding music and  lm soundtracks with
ease and control.
> Legendary Technology
Our NAD PowerDrive circuit delivers very high dynamic power
and low impedance drive to accurately control loudspeakers,
resulting in remarkably musical and relaxed sound. PowerDrive
gives the T 977 maximum power no matter what you throw at it.
We also include our exclusive Soft Clipping feature to protect
your speakers (and ears) from damaging clipping distortion.
> ‘Music First’
With total elimination of audible distortion at any listening
level, the T 977 provides precise imaging and spine tingling
realism in movies and music alike. Each of its seven channels
is fully independent to eliminate inter-channel interference and
noise with the use of NAD’s active ground circuit, and features
MOSFET Class A input and driver stage circuits with a high-
current output stage design employing high speed, discrete
output devices. The result is superb dynamic quality and
musical detail.
> Radically Cool
The T 977 is cooled and controlled by a uniquely designed
forced air system originally introduced in our top-of-the-
line Masters Series M25. The circuit measures not only the
temperature of the heat sinks, but also the level of the input
signals, to automatically silence the fans so as not to spoil quiet
music passages. A combination of fuse and electronic non-
intrusive protection safeguards each of the seven channels
against excess temperature, DC fault, and loudspeaker
short-circuit.
> Installer’s Dream
Developed with system integration and fl exibility in mind, the
T 977 includes a programmable 12V trigger input. Individual
gain adjustment for each channel promotes easy, accurate
system con guration, as does the integral 12V trigger turn-on
response. The T 977 is also out tted with heavy-duty,  ve-way
connectors and gold-plated RCA input jacks.
> Ef cient and Reliable
The T 977 power supply is designed with our exclusive
Holmgren transformer, which together with PowerDrive, acts as
a “fuel cell” that supplies power to the audio circuitry and power
amp, yet maintains superb isolation between the ampli er and
any “dirty” noise on the AC supply that could affect the overall
audio performance. A convenient automatic standby mode
saves energy when the T 977 is idle.
T 977 Seven-Channel Power Ampli er
7 x 140W

NAD Electronics International reserves the right to change specications or features without notice. NAD is a registered trademark of NAD
Electronics International. All rights reserved. No part of this publication may be reproduced, stored, or transmitted in any form whatsoever
without the written permission of NAD Electronics International. © 12/12 12-004 NAD Electronics International.
www.NADelectronics.com
Specications
Total Width 435mm Total Depth 476mm
Total Height
194mm
** Non-metric measurements are approximate.
Note: Installers should allow a minimum clearance of 55mm for wire/cable management.
T 977
T 977
Continuous Output Power into 8 ohms and 4 ohms 7 x 140W (ref. rated THD, 20Hz-20kHz, all channels driven)
Rated THD (250mW to rated power, CCIF IMD, DIM 100) ≤0.03% (ref. 20Hz-20kHz)
Clipping Power ≥185W (ref. 1kHz, 4 ohms, 0.1% THD)
IHF Dynamic Power 8 ohms
4 ohms
2 ohms
230W
390W
450W
Damping Factor >300 (ref. 8 ohms, 50Hz and 1kHz)
Input Sensitivity 1.1V (ref. rated power)
Voltage Gain 29dB
Frequency Response ±0.2dB (ref. 20Hz-20kHz)
-3dB at 3Hz and 100kHz
Signal/Noise Ratio, A-Weighted >96dB (ref. 1W)
>125dB (ref. 140W)
Time to Automatic Standby (without signal) <30 minutes
GENERAL
Rated Power 800W (120V 60Hz, 230V 50Hz)
Idle Power <300W
Standby power <0.5W
Unit Dimension (WxHxD) - Gross **
(includes feet, knobs and terminals)
435 x 194 x 476mm
17 1/8 x 7 11/16 x 18 3/4”
Net weight 32.3kg (71.2lb)
Shipping weight 36.5kg (80.5lb)
FUS E
MAI NS IN
SPE AKER S PEA KER S PEA KER SPEAKER SP EAK ER SP EAKE R SPE AKE R
INP UT
+12V TRIGGER IN
ON OFF
C H A NN E L 7 F R O N T R
C H A NN E L 6
C H A NN E L 5
C H A NN E L 4
C H A NN E L 3
C H A NN E L 2 S UR R R
S UR R -B R
C E NT E R
S U R R -B L
S U R R L
C H A NN E L 1 F R O N T L
FRONT R SURR R SURR-B R CENTER SURR-B L SURR L CHANNEL 1 FRONT L
LEV EL LEV EL LE VEL L EVE L LEVE L LEV EL LE VEL
MAX
MIN M AX
MIN M AX
MIN M AX
MIN M AX
MIN M AX
MIN M AX
MIN
CHANNEL 7 CHANNEL 6 CHANNEL 5 CHANNEL 4 CHANNEL 3 CHANNEL 2
INP UT INP UT IN PUT I NPU T INPU T INP UT
SOFT
CLIPPING
SOFT
CLIPPING CH 1 CH 2 CH 3 CH 4 CH 5 CH 6 CH 7
Seven Channel Power Amplifier T 977