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Nakamichi SR-4

Remote Control Stasis Receiver

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Nakamichi SR-4


The Nakamichi SR-4 redefines the word receiver.

It offers the same convenience and economy but it's designed like separate audiophile components, each individually optimized, each individually powered, each isolated for minimum interference.

And what a receiver: Stasis power amplification for uniform impedance, inherent stability and tremendous peak-current capability, a moving coil/moving magnet phono preamp with precise equalisation, an effective subsonic filter and more!


Tuning range: FM, MW

Power output: 60 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.1%

Input sensitivity: 0.16mV (MC), 2.5mV (MM), 200mV (line)

Signal to noise ratio: 73dB (MC), 80dB (MM), 105dB (line)

Output: 200mV (line)

Speaker load impedance: 4Ω (minimum)

Dimensions: 430 x 100 x 370mm

Weight: 9.8kg

Accessories: remote control



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Reviewed Jun 14th, 2017 by tomnxx


Reviewed Nov 19th, 2016 by HeavyNova

For 2-channel listening, the SR-4A stands in a class by itself in the value/performance category with its full feature set of tuner, phono-in and CD-in.

The Nelson Pass designed Stasis amp circuit competes favorably in the Class A amplifier category. The 60 RMS wpc rating is perhaps a bit understated, as I can't stand to turn my 150 RMS wpc highly modified and very efficient Klispch Quartets above the 9 o'clock position on the volume dial. The SR-4A is going to really shine and give you its best performance when using efficient, audiophile grade 8-ohm speakers.

I purchased this for $200 used on eBay. It is easily overlooked, as it looks like any generic Japanese receiver from the 1980's, but that's where the similarities end. Don't be fooled, there is no other possible way to find an honest 60wpc Pass designed amplifier for $200. This alone should be enough to get everyone onboard and interested to hear what this unit has to offer. The SR-4A is better than anything else I've ever heard. Not to mention it also comes with an amazingly clear and precise MM/MC phono section that puts my handmade Bugle 2 phono pre-amp to shame. Tuner is decent, nothing to write home about.

In short, the SR-4A sounds better for 2-channel listening than any Integrateds or Seperates that I've heard even though it is an A/V Receiver and has absolutely no business sounding this good. While it may seem underpowered on paper compared to the inflated wpc stats of modern AVRs, don't be fooled. This is simply not the case as it will pump out ear-splitting aural ecstasy when coupled to efficient, 8-ohm speakers. There is absolutely no buzz, humming or hissing at the highest volume levels- just a pure, silent black envelope of space. This is Stasis and it's beautiful.

Two words describe its sound, hyper realism. That is all.

Reviewed Apr 12th, 2016 by monte verdi

For starters I never give a 10 as many do because they are wowed by hearing a step up in performance from a common Mid-Fi system. I try and be judicious and fair in consideration of price category and value regarding performance.
Now after owning much tube and solid state high end gear such as Accuphase, Blue Circle and Perreaux to name but a few I must conclude that the NAK SR4A is a fine piece of gear. It does not smoke my main system as few things can but it does a very nice job of extension in both directions with a firm solid grip on transients and bass. The high end is detailed and relaxed and for those that have heard Pass Labs there are definite similarities. Namely, because this amp uses a Stasis amplification system designed by Nelson Pass for Threshold back in the 80's and licensed to Nakamichi for this release and a few other NAK's.

One important note is that this is the last Nakamichi Stasis receiver to be manufactured in Japan with subsequent amps and receivers being made in Taiwan. What does this mean, well I can attest that the power transformer is wound in Japan and we all know the Japanese are masters when it comes to fine copper and transformer winding back in the 60's-80's and presently with Hashimoto, Tango & Tamura.

Back on topic, I currently use the NAK SR 4A as a headphone amp and it smokes most Hi-End headphone amplifiers with it's shear muscle and finesse that music just rolls out relaxed detailed and controlled with an Iron fist. Smooth, detailed with a deep soundstage and harmonic textures that must be heard to be believed. My 600 Ohm Beyerdynamic DT990 Premium headphones sound superb with this amp and I had no idea just how good these headphones could sound until I plugged them in playing 4XDSD or vinyl via my Coph Nia MC Swedish phono stage. I highly recommend this amplifier and if you're into headphones do try as the output stage passes into the headphone output in the circuit after looking at the schematics!

Reviewed Jul 16th, 2015 by totorg

Great website, thank you. I use to sell all sorts of gear back in the day including Nakamichi, and while I loved their tape decks, I never paid much attention to the receivers. Fast forward 33 years: I have spent the last 17 years back in the listening game and have learned to listen much better than when I sold the stuff. Over the years I have listened to countless esoteric amplifiers both SS and tube, I have owned a variety of them from 8 watt SET amps to 200 watt load invariant units. I have run these on a variety of speakers from Klipsch La Scallas to Mggnepans...etc. After much reading, I recently picked up a Nakamichi SR 4A on eBay for a couple of hundred bucks. It was purchased for a mobile kitchen project's sound system. Received it, took off the top cover and blew out years of accumulated dust, sprayed the control pots with Deoxit, and WOW! This thing sounds very good and it is not even burned in! I am streaming full files from an IMac feeding into a Peachtree IDAC, my speakers are 12 cast frame single point source Audio Nirvanas 96db. I was absolutely stunned by the quality, transparency, width and depth of stage, non-glaring sound coming out of that Naka receiver. Difficult passages remained well detailed, did not bunch up or scream at me, decay of symbals sounds very natural and voices have a tube like liquidness about them. A truly remarkable piece of equipment for just a couple of hundred bucks. I would seriously recommend this unit to any one on a budget wanting great sound.



re: SR-4

So after continuing to burn in this unit; Nakamichi SR 4, I am finding that the low level listening is superbe. The unit has a defeatable tone control section and also a variable loudness knob as well, between the two, it is almost like having a parametric eq. built in. What I am finding is exqusite detail and sound stage at the lower levels. This giving me the desire to try one of Mr. Pass' First Watt units just to see what all the fuss is about.

re: SR-4

I agree. The SR-4A only sounds better with continued use. Mine may not have been used in a while when I purchased it online so the caps may have needed to be reformed a little by playing it for a while to start sounding their best. However, its sound really seems to "open up" much more when kept on continuously and the unit is warm to the touch. It uses Nichicon Muse electrolytics across the board(s), mine all still "appear" to be in perfect shape, although a future recap may be in order at some point which I do not look forward to, as the boards do not appear easily removable.

For anyone interested in this amp, when you first get the SR-4A turn the variable loudness dial fully clockwise to the "1" (normal) position- anything else just sounds bad. Next, allow it to reach operating temp. Turn volume all the way down and insert the supplied shorting plugs into the CD player input jacks (if you still have them). Then, remove the top cover. Find the main PCB and adjust the idling current to 23 mV for L/R channels using VR701 and VR801 potentiometers. It is a very delicate and finicky adjustment that takes awhile to get perfect, but is worth doing.

The follow-up Taiwanese made Nakamichi TA amplifier series offers more wattage and slightly better bass, but sacrifices build quality, reliability and a small hit to the more nuanced sound of the original Japanese made SR amp series.

This website is not affiliated with or sponsored by Nakamichi. To purchase SR-4 spares or accessories, please contact the company via their website or visit an authorised retailer.