NAD 3100 bridgeable stereo amplifier - charcoal grey :
For most manufacturers, the highest quality parts and most highly refined designs are used only in separate audio components-in preamplifiers, power amplifiers, and tuners
Integrated amplifiers are usually made to a less exalted standard, while all-in-one stereo receivers are regarded as compromise products suitable only for casual listeners. But not at NAD. NAD electronics are designed in modular form, and many of the same circuits are used in all product categories
The 3100 integrated amplifier,for example, combines NAD’s robust 2100 power amplifier with high-quality preamplifier circuitry derived from some of NAD’s finest preamplifiers. The pre- and power amplifier sections of the 3100 are joined by removable external jumpers that allow you to insert external processors such as a surround-sound unit or an electronic crossover for bi-amping in the signal path
Like the 2100 power amplifier, it is conservatively rated at 60 watts / channel for sine-wave test tones, while its Power Envelope circuit produces 200 to 330 watts channel of long-term tone-burst power for the dynamic waveforms of music. Its high-current output stage, impedance selector, and heavy-duty speaker terminals are designed to deliver maximum power to loudspeakers of any impedance
The preamplifier section of the 3100 contains the same low-noise MM/MC phono stage as the 1700 preamplifier/ tuner and the same switchable Infrasonic Filter, flexible two-way tape connections, Bass EQ, and ultra-quiet feedback-operated volume control as NAD’s state-of-the-art 1300 preamplifier
The tone controls are Baxandall bass and treble circuits, but with their parameters carefully selected to allow substantial adjustments at low and high frequencies without altering the neutrality of the midrange
How to operate in bridged mono single channel mode :
1] BRIDGING switch at the rear bridges the two power amplifier channels to form a monophonic amplifier with more than double the output power
To convert to bridged operation, the following procedure should be followed :
1] Switch power off, 2] Set impedance switch at rear to 4 ohm NORMAL, by undo securing screw and slide bracket to the right
3] In bridged mode, the power amplifying section of this amplifier could say drive your left speaker, while another similar bridged amplifier, like 3100 or 2100 would drive the right speaker
For this common setup, leave the upper pre out/main in jumper link in place, and remove the lower right link, connect the right pre outs, using suitable cables, to the second amplifier's mono [left] inputs
4] Disconnect any speaker wires from speakers A or B; Connect the single speaker being driven by a bridged 3100 with speaker positive wire to the R+ terminal [red] and negative to the L+ terminal [red]
Do not connect to any black terminals
CAUTION : In the bridged mode - wires must be connected directly from amplifier to speakers : NOT to a speaker switch, a headphone adaptor or any other device that shares a common ground between the channels
5] After these conditions are satisfied, reset the Bridging switch. It is held in place by a plastic bracket and a screw in a slot
Use a small screwdriver to loosen the bracket screw, rotate it about a half turn counter-clockwise, then slide the switch left to ON
Bracket will move with the switch and secure when in place by rotating clockwise the bracket screw
Turn the power ON
6] To return the mono amplifier to stereo operation at a later time, first turn the power off : loosen bridging bracket screw: reset switch to OFF [right]
Restore the link connection for right pre out / main in and reconnect stereo speakers wires as normal with each channel negative conductor to black, and right conductors to red terminals
Specifications, Preamplifier :
-:®:- Vintage : 1986 model
-:®:- Phono input : Input impedance [R and C]: MM: 47kohms / 100pF, MC: 100ohms / 1000pF
-:®:- Input sensitivity [1kHz]: MM: 2.5mV [ref 0.5V], MC: 0.18mV
-:®:- Signal to noise ratio : MM: 75dB [ref 5mV], MC: 75dB [0.5mV]
-:®:- Total harmonic distortion : < 0.04%
-:®:- Phono RIAA accuracy : +/- 0.5dB
-:®:- Line level inputs : Input impedance [R and C]: 50kohms / 500pF
-:®:- Input sensitivity [1W]: 20mV
-:®:- Maximum input signal : 10V
-:®:- Signal to noise ratio : 94dB
-:®:- Frequency response [20Hz to 20kHz] : +/- 0.5dB
-:®:- Line level outputs : Output impedance : Preamp: 600ohm, tape: source Z + 1kohm, max out pre: 10V
-:®:- Tone controls: Treble: +/- 9dB at 10kHz, Bass: +/- 10dB at 50Hz, Bass EQ: +3dB at 55Hz and +6dB at 36Hz
-:®:- Infrasonic filter : -3dB at 12Hz, 12 dB/octave [switchable]
Specifications, power amplifier : Continuous power [min RMS per channel 20Hz to 20kHz, less than rated distortion into 8ohms]:
-:®:- 60W RMS [17dBW]
-:®:- Rated distortion [THD, 20Hz to 20kHz] 0.03%
-:®:- Clipping Power : 70W
-:®:- Dynamic headroom +6dB
-:®:- IHF Dynamic Power x 2 at 8 ohms: 200W, 4 ohms 250W, 2ohms 330W
-:®:- Damping Factor [8 ohms, 50Hz]: > 100
-:®:- Slew Rate > 35V / μsec
-:®:- Input impedance : R = 10kohms, C = 600pF
-:®:- Input sensitivity at rated power : 850mV
-:®:- Signal to Noise ratio [1W / 60W, A-weighted]: 100dB / 117dB
Bridged monophonic mode : -:®:- 100W RMS [20dBW]
-:®:- Dynamic headroom [IHF 8ohms] : +7dB
-:®:- IHF dynamic power [maximum short term power per channel] : 8 ohm: 500W [27dBW], 4 ohms: 660W [28dBW]
Dimensions : -:®:- Dimensions [W x H x D] : 435 x 106 x 385mm -:®:- Weight : 10.4kg packed weight : 12kg
SOLD October 2012 on trademe to Hibiscus Coast
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