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NAD T 975 7-channel power amplifier

Item # 745T975

Item # 745T975

Shop all NAD Power Amplifiers

About the NAD T 975

Dave Bar

Plenty of power to spare

The NAD T 975 power amplifier can respond instantly to any sonic demand — whether it's movies or music — and keep doing it without complaint or a hint of distortion. With its massive toroidal transformer-based power supply, this amp can deliver plenty of clean, quiet current to all seven fully independent mono block amplifier channels simultaneously. Plus, the T 975 is even capable of driving speaker loads down to an impressive 2-ohm rating, so it's ready to handle whatever you throw at it. NAD's proprietary PowerDrive™ circuitry makes sure that your loudspeakers will be controlled with authority and finesse. And their exclusive Soft Clipping™ feature makes sure your speakers are protected from the effects of signal clipping well before any damage can occur.

Product highlights:

  • 7-channel home theater power amplifier
  • 140 watts x 7 channels into 8/4 ohms (20-20,000 Hz) at 0.03% THD all channels driven simultaneously
  • 2-ohm stable for use with a wide range of speakers
  • PowerDrive™ circuitry with automatic speaker impedance sensing delivers maximum dynamic power output regardless of speaker load
  • switchable NAD Soft Clipping™ circuit gently limits amplifier power output to reduce risk of speaker damage due to prolonged high volume operation
  • each channel operates independently to eliminate inter-channel interference and noise
  • individual gain controls for each channel
  • thermostatically controlled fan with signal tracking circuit
  • massive custom-wound toroidal transformer with proprietary shielding to eliminate noise
  • signal-to-noise ratio: 95 dB (at 1 watt), 125 dB (at rated power)
  • gold-plated RCA inputs
  • gold-plated binding post speaker terminals
  • 12-volt DC trigger input
  • detachable power cord
  • 17-1/8"W x 7-5/8"H x 19-9/16"D
  • weight: 68 lbs.
  • warranty: 2 years
  • MFR # T975

What's in the box:

  • 7-Channel power amplifier
  • 6' AC power cord
  • Owner's Manual
  • Warranty Card

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More details on the NAD T 975

Stacey B.

Product Research

Features

Seven Channel Power Amp: The power rating of 140 watts (continuous) x 7 is taken with all channels driven simultaneously into a 4Ω or 8Ω load, from 20Hz to 20kHz, at the rated distortion of 0.03% THD.  The T 975 provides a dynamic power of 230W/ch into 8Ω and 390W/ch into 4Ω.

NAD's Full Disclosure Power Ratings: NAD uses Full Disclosure Power (FDP), the most demanding criterion for performance measurement. FDP specifies distortion under the most extreme conditions of low impedance loads and frequency extremes, rather than the simple and easy 1kHz @ 8 ohms test quoted by many of other manufactures. NAD uses this stricter performance criterion because it more closely matches the demands of real music and real loudspeakers. Maintaining specified distortion at 4/8Ω and at 20-20kHz is a much more difficult achievement. The benefit of NAD's Full Disclosure Power is the total elimination of audible distortion at any listening level. This provides pinpoint imaging and realism with music and movies alike.

Mono-Block Modular Construction: The T 975 employs mono-block construction for each of its seven channels. Every element of each channel's circuitry, save the power supply, is fully independent thus eliminating inter-channel influences as a concern. The T 975 employs active ground isolation to further eliminate any possibility of inter-channel interference even when more than one preamplifier is driving the power amp (as might be the case in a custom installation).

Class A Input Circuit Topology: The T 975 features an FET Class A input and driver stage circuits, and a high-current output-stage design, employing high speed, discrete output devices to promote superb dynamic quality.

PowerDrive Amplifier Technology:  The T 975 uses NAD's proprietary PowerDrive amplifier technology that provides high dynamic power and low impedance drive capability. By adding a second high-voltage rail to the amp's well regulated high-current power supply, the amplifier can nearly double its continuous power on a short term dynamic power basis. This uniquely efficient power supply topology provides the real world benefits of high dynamic power that remains uncompromised by low impedance speakers. The PowerDrive topology allows the T 975 to deliver maximum performance under virtually any  circumstance, independent of the loudspeakers it is driving. The circuitry automatically senses the impedance characteristics of the loudspeaker and will then adjust its power supply settings to best cope with that specific load. PowerDrive topology is a practical approach to enable an amplifier to easily deal with musical dynamics and difficult speaker loads. PowerDrive not only makes NAD amplifiers sound better, it makes them cooler running, with improved efficiency, leading to greater reliability as well.

NAD Soft Clipping: The T 975 incorporates NAD's unique Soft-Clipping circuitry in all seven channels. Any amplifier can be overdriven if it is played too loud, exceeding the maximum output power. Under such circumstances, amplifiers produce extreme high levels of distortion which, besides sounding very unpleasant, can damage your loudspeakers. The Soft Clipping circuit suppresses such distortion and minimizes the risk of damage to speakers. This is particularly important with movie soundtracks which often contain very dynamic outbursts in which, unlike music, it is difficult to hear this potentially damaging distortion. The Soft Clipping LED on the front panel illuminates when the Soft Clipping circuit is engaged. Soft Clipping can be defeated with a rear panel switch.

Low Loss, Massive Holmgren Toroidal Mains Transformer: The T 975 employs a "Holmgren" transformer for its superior regulation and low stray magnetic field. This exclusive transformer uses a special core design and materials to enhance efficiency 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 film soundtracks.

Thermostatically Controlled Fan w/ Signal Tracking Circuit: The T 975 uses a unique variable speed fan cooling system first introduced on NAD's M25 Masters Series amplifier, allowing the T 975 to deliver massive amounts of power for hours on end. Many lesser amps thermally protect and cycle on and off when asked to perform at their maximum causing an unpleasant disruption of the movie. While a well designed forced air system can eliminate thermal cycling, it is crucial to keep the noise of the cooling fan from intruding; especially during quiet passages of the movie or music. To this end, we have developed a unique circuit that measures not only the operating temperature but also the level of the input signal, automatically silencing the fans during quiet passages.

Protection Circuits: This amplifier 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.

Input Gain Control For Each Individual Channel: Each of the T 975's channels has a single RCA input and individual gain adjustment to promote easy, accurate system configuration.

Binding Posts: This multi-channel amplifier delivers its output via heavy-duty "5-way" binding-post speaker terminals.

Turn-on Trigger: The T 975 can be turned on automatically using the 3.5mm +12 volt trigger input on the rear panel.

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