NAD T973 Datasheet

T 973 7-Channel Power Amplifi er
• 7 x 140W Simultaneous Minimum Continuous Power • 7 x 140W Simultaneous Minimum Continuous Power
into 4 / 8 ohms
• 2 x 200W Continuous Power into 4 / 8 ohms
• 230W, 390W and 450W IHF Power into 8, 4 and 2
ohms, respectively
• Mono-block, Modular construction
• Differential, Class A input circuit topology
• PowerDrive™
• High Current Holmgren™ Toroidal Power Transformer
• Input gain control for each individual channel
• Gold Plated RCA Inputs
• NAD Soft Clipping™
• 12V Trigger for automated ON/OFF operation
NAD has a well-deserved reputation for
producing amplifi ers with extraordinary
performance and always at an affordable price.
The T 973 keeps this tradition alive and well by
applying 30 years of experience to the challenge
of producing a high power, high performance,
seven channel power amp able to provide the
muscle required for even the most sophisticated
Home Theatres.
Design
As might be expected in an amplifi er capable
of one kilowatt (1,000 watts) of continuous
power output, the power supply needs to be
very carefully designed. As usual, NAD favours
the toroidal transformer type for its superior
regulation and low stray magnetic fi eld. Our
exclusive "Holmgren" transformer uses a special
core design and materials to enhance effi ciency
and make the transformer less sensitive to DC
offsets on the AC mains voltage. Over 80,000 uF
of storage capacitance ensure an ample reserve
of power for even the most demanding music
and fi lm soundtracks.
The T 973 employs monoblock construction for each of its The T 973 employs monoblock construction for each of its
seven channels. Every element of each channel's circuitry,
save the power supply is fully independent, eliminating
inter-channel infl uences as a concern. The T 973 employs
active ground isolation to further eliminate any possibility
of inter-channel interference even when more than one
preamplifi er is driving the power amp (as might be the case
in a custom installation).
Each section features an FET Class A input and driver stage
circuits, and a high-current output-stage design, employing
high speed, high current discrete output devices to
promulgate superb dynamic quality. The result is musical
detail, impact, and soundstage stability and depth
unmatched by multi-channel amps of even two and three
times the T 973's price. NAD's proprietary Soft Clipping
(defeatable) maintains sonic quality and offers speaker
protection even under severe overdrive conditions.
Individual gain adjustment for each channel promotes
easy, accurate system confi guration, as does the T 973's
integral 12V trigger turn-on response. This multi-channel
amplifi er delivers its output via heavy-duty "fi ve-way"
connectors.
Ruggedness and in-system reliability are critical to
successful custom-installed systems. This amplifi er
utilizes a combination of fuse and electronic nonintrusive
protection: dependable, fail-safe, and sonically benign.
Each channel is fully protected against excess temperature,
DC fault, and loudspeaker short-circuit.
PowerDrive™
The T 973 also benefi ts from NAD's proprietary
PowerDrive circuit topology, now well established and
used throughout the NAD product range notably, in
the highly reviewed models such as the C 320BEE and
C 370. The PowerDrive topology allows the T 973 to