Big sound, great soundstage, large dynamic and nice detail.

It really goes hot.Too big and heavyto stand on a shelf.

I love my Nakamichi PA7II because it is the only one which can put my loudspeakers Infinity Kappa 7 singing.It has a natural reproduction of the musical experience, wthout trace of coloration.
We can feel and hear the ambience of the stage. High output power combined with high current capability, and the STASIS, (remenber Nelson Pass, Treshold ?), wich eliminates the need for global feedback, ensure dramatically improved speaker drive capability under real life condition.Dynamic impact, minimum distortion and wide frequency range are immediately apparent when auditioning these amplifier.

Similar Products Used:

Amplifiers, Musical FidelitY P270, Sonic frontiers SFS80,..
Pre amplifier, Sonic Frontiers SFL1,
CD Player, Akai pd73,
Record player, Rega Planar 3.

High quality milled front panel, good build quality
High current, lot's of headroom, plays loud
Good thermal dissipation

Bright, lack of low end fullness
RCA connectors are fragile, spaced too closely

Nakamichi PA-1 five channel amplifier review
By: Mark Donnigan, courtesy Audiocore (markadonnigan@earthlink.net)

Overview
The PA-1 is a 100-watt by five-channel power amplifier sold in the US by Nakamichi and was in production from approximately 1996 to 1999. In this review I?ll attempt to give a basic overview of the strengths and weaknesses along with my conclusions based on extensive listening. Without giving it all way before you read on, this amplifier is an excellent contender for anyone looking for high performance on a budget. Whether you?re building a dedicated home theatre or already have one and are looking to upgrade to separates; this amplifier will please most listeners in applications from two channel to discreet multi-channel.

Performance Specifications
Rated power is 100 watts per channel with all five channels driven at 0.1% THD 10Hz to 30kHz at 8 ohms. Dynamic power is measured to be 140 watts with all channels driven. Suffice it to say, this amplifier has sufficient headroom to drive even the most demanding speaker loads. Output current capability is 15 amps continuous and 30 amps peak per channel with all channels driven. The power supply contains a 910-watt R-core transformer and houses 60,000uF of capacitance. Weighing in at 49 pounds, this amplifier definitely leans toward the high current conventional side of modern amplifier design. Original MSRP was approximately $1799 with current pre-owned street prices in the range of $700-850 based on condition and other intangible factors.

Strengths and Weaknesses
Being a positive guy, I?ll cover strengths first. The first thing I noticed after much listening and analysis is that this amplifier has headroom to burn. Volume was never for lack of want, and the amplifier always matched the level demands I made of it. As I mentioned in the above performance section, this amplifier incorporates a high current design giving much emphasis to storage in the power supply and the ability to deliver up to 30 amps for each of the five channels. Bottom line, if you like volume or have speakers that are difficult to drive, the PA-1 should suit your needs for all applications except possibly the largest of rooms.

Of course one of the trade offs typically found in an amplifier of this design is thermal efficiency. Consequently I was pleasantly surprised to note that even after prolonged listening sessions or heavy use that it never over heated.

Nakamichi incorporates what they call Harmonic Time Alignment into the design of the PA-1. Unfortunately I was unable to obtain detailed technical documentation on what it really means. Therefore I can only assume this circuit contributes to the ultra wide frequency response of 10Hz to 130kHz that Nakamichi reports, and based on listening tests I would also surmise that it contributes in some way to the forward and open sound quality I heard.

Another positive for this amplifier is the chassis and front panel build quality with the front panel being nicely milled and finished. However, I must comment that the RCA connectors are not as robust. Due to their close spacing, it was difficult to connect high quality cables, and in addition the connectors themselves seemed to be prone to mechanical failure from excess stress placed on the connector when a large cable was used and not properly supported.

This amplifier may have guts, but if you are powering a pair of speakers that are a little bright or bass shy, you will probably be disappointed with a perceived lack of bass or roundness to the sound. Additionally, the system will possibly sound overly bright and forward. Consequently pairing the PA-1 to a pair of neutral or ?fat? sounding speakers will be the key to getting the best spectral balance or blend from this amplifier and your speaker system.

Listening Observations
Obviously sound quality is very subjective, so rather than go into great detail about how I THOUGHT it sounded, I?ll briefly discuss my listening system and the basic conclusions I arrived at. My reference system at the time of this review consisted of a Sony TA-E9000ES processor/pre-amp and Alesis Monitor 2 studio monitors for Left, Center and Right, along with Alesis Monitor 1?s for the Rear Surrounds. The Alesis Monitor 1 and 2 are a conventional 2 and 3 way speaker design respectively. Their primary application is for recording studios and as such they work best in the near field. If you are asking why I choose those speakers, it?s because I also own a personal recording studio and desired as much coherence as possible between my studio monitoring system (Monitor 2?s) and my home theatre.

One quick note on the program material used; my listening tastes range from modern rock to jazz and movies run the gamut of major Hollywood motion pictures. (I am very fond particularly of female vocals in both jazz and rock contexts.) Needless to say with my recording background, anything I listen to whether it be a CD or DVD Movie, must be well recorded. Consequently the conclusions I?ve arrived at are not based on popping in a few disparate tracks over the course of a single evening or weekend, but instead of listening for possibly over a hundred hours and as many different pieces of software.

I?ve already mentioned that this amplifier plays loud; therefore if you are driving a decent pair of speakers and not expecting them to work outside their natural mechanical limits (i.e. Pounding bass from a 6 1/2? woofer at 110dB), then you will find volume and headroom to spare. As to the lack of bass or accentuated high frequency response, this is a characteristic of the PA-1. Consequently if you like a fuller more round sound, the PA-1 may not be the best choice for you. Especially if the speakers you?re driving are on the bright or lively side of things. But then again this is all subjective, so possibly what I perceived as a bright or even harsh sonic quality at times is exactly the sound you prefer. It?s worth noting that Nakamichi is a Japanese company and generally speaking Japanese amplifiers exhibit these sonic characteristics. (Obviously as in any generalization, that?s not always the case, but it?s probably true in more cases than not.) In my opinion, that is one of the things that makes audio so much fun. There is no right or wrong and thank God that?s the case, because if it were there would only be one system to listen to and after a while we wouldn?t even know if it still sounded good since no alternative point of reference would exist.

More Information
I sincerely hope you found this review helpful. As an audio consultant and system designer specializing in residential and commercial/professional system designs. I feel I possess a unique perspective in putting together systems that tends to be practical and real world focused. I?m like a lot of my clients in that I am always looking to improve my system and achieve better sound or results, but don?t always have the budget to go ?all the way?. Consequently I welcome any inquiries you may have for my services, I can enter a project at any level and am very comfortable putting together a reasonably priced home theatre or Hi-Fi package, all the way up to the design, project management and tuning of large scale dedicated theatre?s or church/auditorium sound system?s. And of course I also make it a point to always have a selection of inventory available to sell that represents high value and sonic integrity.

Mark Donnigan
Audiocore -- Seattle, WA
Tel: 425-583-0022 ? Email: mdonnigan@hotmail.com

Similar Products Used:

Acurus, Carver, AudioControl, Creek, Stewart, Alesis

Excellent sound, massive build, sexy looks, everything !

... heavy

Usually when changing or replacing amps, I only notice small differences, but not with PA7 ! Suddenly everything sound so smooth and musical with strictly none of listeners fatigue. Never harsh nor edgy but all details are there. At used price this amp is a steal, considering that you'd have to spend megabucks nowadays to come up with something of similar quality. Get one, you won't regret it (even if you do, this amp will still be an easy sell).

I tried PA7II with several speakers and resulted in similar pleasing effect - focal diy, dynaudio diy and kef 104/2. Good luck !

Similar Products Used:

Adcom 2535, B&K 202+, Bryston 4B, Rotel 990

I have owned a PA-7A for the past 14 years. I have auditioned numerous other components with it. It still resides as part of my current reference system. The single best attribute of this amp is its overall musical presentation. Pared with the right componentry, the soundstage is wide and immensely deep, well beyond the speaker boundary. The amp will resolve inner detail of orchestral works with tremendous accuracy, but never resorts to being "over-analytical." It reports well from the frequency extremes; however, some slight graininess in the upper treble can be noticed on women's vocals and massed strings. For the most part, the amp is very smooth, and listener fatigue is low. I have spent many entire days listening hour after hour, and have never felt as though the amp was imparting a distracting sonic character of its own. This amp does run hot. It must be biased very close to Class A, although being a "stasis" design it doesn't conform to the standard norm. A single 400 watt torrodial tansformer provides the umph. The amp has 14 output devices per channel, and uses 2 devices for the "mirroring" signal. The 5-way binding posts are not the most heavy duty, and after auditioning munerous cables over the years, stripped out. I have since replaced them Eddison-Price binding posts, and the sonics improved by a small margin over the sound using the original posts.
Cosmetically, this is a "sexy" amp. It doesn't have alot of glitz, bells, or whistles. Only a single green bar iluuminates over the power on/off switch, and 2 small red LED's are located in the middle of the front panel for each side, which indicate amplifier clipping. The heat sinks are MASSIVE, and, as I mentioned earlier, get extremely hot with use. (I have been known to use this amp as a space heater in the winter for my music room.) They contibute very much to the amps 70 lbs.
This amp was never formally reviewed in any of the mainstream mags or "underground" mags that I know of. Not many Japanese componenets are. That is really a shame. I have heard better amps, but not close to this price range. When this amp was new, Adcom had just released its GFA-555, which was heralded as a giant-killer. The Nakamichi PA-7A destroys the Adcom in a side-by-side comparison. Infinitely more detailed, dynamic and open. The Adcom does have slightly more bass reinforcement, but it's not as controlled as the Nak. During its day, it could have been borderline class B for "Stereophile", considering they gave the Adcom a solid Class C rating. I have lived with this amp for 14 years, and only my turntable (an Oracle Delpi MkII) has been in my reference system as long. The PA-7A will doubtless be the last to go.

built quality high resale value

Harshness in mids and hi freq. Not terrible but present

This amp is better than the Parasound 2200 for sure. I actually liked the PS Audio 200cx better as it had better bass control and more detail and air at top end. But the real sleeper of this group is the Warner Imagining VTE 200s!It was sweet and smooth. VTE had great soundstaging and sweet mids and highs. PLUS better bass control than the NAK PA 7 and almost as good in bass as PS 200cx. It is seriously difficult to find a sub $1000 SS amp used that isnt somewhat brutal with a digital front end. Ironically the best sounding amp of the group VTE 220s was the least known and the hardest to sell. If considering a ss amp in this price range the PA 7 is pretty good and very easy to resell for what you paid which should be around $600-700.

Similar Products Used:

Parasound 2200, Warner Imaging VTE 200s, PS Audio 200cx, AR D 130