Nakamichi SR-3E

 Stasis Amplification

Audiophiles who hear the SR-3E are amazed at its effortlessly transparent sound. Music has more detail, more impact, more realism - especially when reproduced on "difficult" top-quality speakers. The reason is our "Stasis" power amplifier - the same concept used in the PA-7 and PA-5 Power Amplifiers.

STASIS is a radically different and superior design in which two amplifiers drive the speaker; a high-quality low-power amplifier and a "Current-Mirror Bootstrap" to supply muscle. The low-power amplifier can be designed for virtually perfect performance, "global" feedback isn't needed as in ordinary power amps. Removing the overall  feedback ensures uniform output impedance and inherent stability, and, since the amplifier is stable, there's no need to isolate it from the speaker with a coil as is usually done. This permits the amplifier to control the speaker more preciselly and realize its full potential. The current bootstrap provides tremendous peak-current reserves - up to 25 ampers into low-impedance loads.

Specifications

Power Amplifier Section

Continuous Average Output Power (IHF-A):  45 watts per channel (8 Ω, both channel driven, 20-20,000 Hz, no greater than 0,1% T.H.D.)

Dynamic Output Power (both channel driven): 

64 watts per channel into 8 Ω

80 watts per channel into 4 Ω

Dynamic Headroom (IHF-A):  1,5 dB

Power Bandwidth:  5 -40,000 Hz

Frequency Response (IHF-A):  5 Hz - 75 kHz  +0 -3 dB

Signal-to-Noise Ratio:  better than 105dB (rated power); better than 85 dB (IHF-A-202)

Total Harmonic Distortion (Rated Power, 8 Ω):  less than 0,1% (20 - 20,000 Hz)

Intermodulation Distortion (Rated Power, 8 Ω):  less than 0,15% (60 Hz :7 kHz = 4 : 1)

Headphone Rated Output (40 ohms):  105 mW

Output Current Capability:  18 A peak per channel

Preamplifier Section

Input Sensitivity (for Rated Output):

Phono MC (gain; 32/24 dB):  60/150 µV

Phonoo MM :  2,5 mV

CD, Tape, Video:  200 mV

Sensitivity (1 watt, IHF-A):

Phono MC (Gain; 32/24 dB):  8,9 / 24 µV

Phono MM :  0,37 mV

CD, Tape, Video :  30 mV

Input Impedance:

Phono MC :  100 ohms

Phono MM :  47 k Ω

CD, Tape, Video :  20 k Ω

Maximum Input Level (1 kHz):

Phono MC (gain; 32/24 dB):  3/8 mV

Phono MM :  140 mV

Record Output Level/Impedance:  200 mV/1 k Ω

Total Harmonic Distortion (20  20,000 Hz, to Rec Out at 1 V):

Phono MC :  less than 0,003%

Phono MM :  less than 0,002%

RIAA Deviation:  30 - 20,000 Hz ±0,5 dB

Signal-to-Noise Ratio (to speaker output, IHF-A):

Phono MC :  better than 73 dB (32 dB gain); better than 72 dB (24 dB Gain)

Phono MM :  better than 80 dB

Tone Control

Bass:  20 Hz ±10 dB

Treble:  20 kHz ±10 dB

 Loudness:  20 Hz +10 dB; 20 kHz +6 dB

Subsonic Filter (Phono only):  20 Hz, -12 dB/octave (cutoff Frequency)

FM Tuner Section

Frequency Range:  87,5 - 108 MHz

IHF Usable Sensitivity [mono]:  11 dBf (1,9 µV)

-50 dB Quieting Sensitivity [mono/stereo]:  21,0 dBf (6,1 µV) / 42,0 dBf (69,0 µV)

Signal-to-Noise Ratio at 65 dBf [mono/stereo]:  better than 74 dB / 69 dB

Muting Threshold:  30 dBf/17,3 µV

Frequency Response:  20 Hz - 15 kHz ±1 dB

Total Harmonic Distortion [mono/stereo]:  less than 0,12% / 0,20%

Capture Ratio:  2,0 dB

Alternate Channel Selectivity:  70 dB (±300 kHz)

Stereo Separation at 1 kHz:  better than 43 dB

Spurious Response Rejection:  better than 90 dB

Image Rejection:  better than 75 dB

IF Rejection:  better than 80 dB

AM Suppression:  better than 60 dB

AM Tuner Section

Frequency Range:  522 - 1611 kHz

Sensitivity:  53 dBµ/m

Signal-to-Noise Ratio (at 90 dBµ/m):  better than 52 dB

Total Harmonic Distortion (at 90 dBµ/m):  less than 0,3%

Selectivity:  better than 20 dB (±10 kHz)

General

Power Source:  110,120,220 or 240 V AC, 50/60 Hz

Power Consumption:  270 watts max

Convenience Outlets:  2 x switched; 1 x unswitched

Dimensions  (W x H x D):  430 x 100 x 370 mm (16-15/16" x 3-15/16" x 14-9/16")

Weight:  8,5 kg (18 lbs 12 oz)