Pioneer A400 Integrated Amplifier

Pioneer A400 Integrated Amplifier


Launched back in 1990, the Pioneer A400 was your typical run of the mill "Jap Amp" with a difference. Pioneer stripped out everything that was not needed and used a quite a few high quality audiophile components where necessary to give the world the A400, an amplifier designed to please even the most ardent UK audiophile.

The Pioneer almost immediately got rave reviews in the hi-fi press, won awards and sold by the lorry load. In the 18 months since it was first launched nearly 25,000 of these amplifiers were sold which accounted for a staggering 12.8% of the total market share. The Pioneer was a giant killer which wiped the floor with almost every other amplifier in its price bracket and many more above it.

I remember listening to it at a friend's house and hearing the punchy and dynamic yet detailed sound it produced. Power was something the Pioneer A400 was not short of and it drove my friend's giant 5 foot floor standers with ease. The only downside with the A400 was a relative poor phono preamp and a tendency to sound a little harsh but it was very difficult to criticise it for the money.

The Pioneer A400 was subsequently superceded by the inferior A400X ensuring it became something of a cult machine, something that would keep its value high even on the second hand market.

Pioneer A400 Integrated Amplifier Specifications
Power Rating : 60 Watts per channel (8 Ohms)
Total Harmonic Distortion: 0.03% at 20Hz-20kHz
Frequency Response: 5Hz-100 kHz (CD, Tuner, Aux, Tape)
Signal to Noise: 88 db
Power Consumption: 520 watts
Dimensions (WxDxH) : 42 x 35.2 x 12.6 cm
Weight: 8.0 kg

This entry was posted on Sunday December 10th, 2006 at 5:44 PM and is filed under Amplifiers. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response.

27 Responses to Pioneer A400 Integrated Amplifier

Dai takekawa Says:
November 3rd, 2007 at 12:12 AM


Hi-fi insight Says:
November 3rd, 2007 at 8:52 AM

Thank you,

I think the correct weight of the Pioneer A400 should be 8.0 kgs !

Dave evans Says:
November 21st, 2007 at 12:12 PM

how much is it worth now please can some one please tell me as i have been offered 1 for 100 pound.

Hi-fi insight Says:
November 21st, 2007 at 12:33 PM

£100 seems a reasonable asking price providing it is not an Pioneer A400X which do not sound as good.

Dave evans Says:
November 21st, 2007 at 3:03 PM

thank you

Steve kaye Says:
September 27th, 2008 at 10:31 AM

Hello, I have Pioneer a-400 (1990). It's an old friend, love the sound and would like to marry it to a modern FM radio/cd player - possibly DAB -but can't work out which modern units will connect and work with the old A-400.

Can you suggest a unit(s)?

Thank you.

Nasir noor Says:
December 7th, 2008 at 4:41 AM

Hi would like to know can this Amp A4OO or A400X

suitable for the full range speakers.Cause I own the speakers and interested in A400 or A400X.

What amp is suitable for my full range speakers.

Thank You.


Jamie Says:
December 23rd, 2008 at 9:56 AM

I have a A-300x and would like to know the sound difference the A400 has over it? cosmetically it looks the same apart from a pre amp and headphone socket (I have a Cambridge Audio 640p pre-amp so wouldnt be using the pioneer one anyway)


Libor Says:
January 6th, 2009 at 7:57 PM

koupil bych zachovalý A 400, děkuji za nabídky...

Clive Says:
June 27th, 2009 at 9:59 PM

I have owned a Pioneer A400 from new and have been very pleased with it. I play it though a pair of Epos M5 speakers. My iPod is connected and the system sounds excellent. The review above states that the A400 has a tendancy to sound a little harsh, this has not been my experience, the reverse is true. Having tested amps up to £800 these have sounded harsh and bright in comparison and I have always been more happy with the A400.

Ian harris, australia Says:
September 28th, 2009 at 4:07 AM

I bought a Pioneer A400 shortly after it's release and kept it for several years. Sounded very nice through a pair of very warm Tannoys, but every other speaker auditioned sounded painfully bright. Finally gave in and bought an A400x which I have now owned for many years. Sounds FANTASTIC through Spendor 2020 speakers, Linn/Grace727/Supex900 super, and Marantz CD63 II. It is smooth and refined and gives LONG TERM musical pleasure. Do not sell the A400x short because it is a terrific amp!

Craig Says:
July 15th, 2010 at 12:33 PM

I have owned Perreaux gear and used MOSFET amps as music is extremely important in my everyday life.

The A400 sounds absolutely stunning and I will never sell it. It sounds better, more dynamic and the soundstage is awesome. I ma running 1978 Bang & olufsen speakers with Peerless drivers which are a perfect match to the A400. If you can get one, just do it.


Antonio Says:
August 3rd, 2010 at 10:11 PM

i have pioneer 400X but i sell it because the unit does not equipped with tone control ,but i never think that it was a good one.

Dan Says:
August 25th, 2010 at 9:43 PM

I have an A - 400 amp on ebay at the moment in perfect working order. Original 1990 model. act fast it will go fast. Good luck

John Says:
September 25th, 2010 at 12:25 PM

I bought a Pioneer A-400 today at a garage sale in MINT condition for only $45 which included a Yamaha CDX-396 CD player, an NAD tuner and two Richter Speakers, all in mint condition. What a find. The amplifier is stunning.

John Says:
January 10th, 2011 at 1:30 AM

i have a technics equalizer, phillips cd player (the same age of the A-400), a dvd, a sony blue ray player, a tape player, a garrard turntable, a pioneer laser disk player, i pod, all connected to the A-400 and it sounds amazing, most of this equipment was in storage for 10 years and it still rocks

Krle Says:
April 29th, 2011 at 6:13 PM

ja imam model A 445. model je dobar, me kvari se ali ima slabo napajanje. zvuk je okej.

I have model A 445th model is good, spoil me up but it has low power. sound is okay.
(google translate)

Niels Says:
May 20th, 2011 at 8:22 PM

I have got one (like 18-19 years old), was thinking about buying a new G-Clef from Pioneer, but do I get a better amplifier ??? - the old one still plays music very nicely

Niels Says:
May 27th, 2011 at 2:05 PM

I have got an A-400X, it is almost 20 years old, but still plays nicely.
Was wondering about buying the new G-Clef A-A9-MK2 from Pioneer, but do I get a better amplifier...?
Was the first model (A-400) better than the following A-400X ? Anyone knows the difference ?

Ian Says:
August 12th, 2011 at 5:03 PM

The A400X was good but not in the same league as the A400, The A400 was a great amp, the A400X was just good. While they look the same, it was a totally different circuit in each amp.

Anthony lee Says:
August 26th, 2011 at 1:56 PM

I have an A-400X linear Intergrated Amplifier but someone(technician ) uprooted an IC which gets its input from the volume control nob could you please asist me on the right replacement please by courting the IC number.

Vladimir Says:
December 26th, 2011 at 3:17 AM

Well this amp celebrated its 20th birthday. The amazing sound probably to many Pioneer A400 owners will not sound so brilliant and crisp and they will try and sell it. BIG MISTAKE. The solution is mere few bucks of cleaning spray and that A400 will sound AS NEW OUT OF THE BOX.

Visit my cleaning tutorial tested and proven on my Pioneer A400.

Simon spiers Says:
January 7th, 2012 at 8:54 PM

I have just spent a bit of time tweaking my A400 over Christmas, replacing a few capacitors along with some other tweaks. Driving a pair of Epos M12.2's via more or less any reasonable source the sound is clean and detailed and despite it's age, still shines.

Rob Says:
March 27th, 2012 at 6:10 PM

I recently purchased A400 and I wonder if anybody knows some good links about how to refresh or upgrade it?
Any tests or review links would be nice too.

James Says:
August 21st, 2013 at 8:31 AM

Had one for 3 years in early 2000s. It is a good amp, but that's it. It is not in the same league as something really gem like Audiolab 8000A or Arcam Delta290 Alpha9, not even a Marantz PM80.
It's just a good amp for what it worth.
Considering the age, be prepared to do some service job.

Frankie Says:
October 31st, 2013 at 8:58 PM

Ive owned both, very musical amps, I would avoid the X models, no comparison to the original! The best upgrade is to replace coupling capacitors c102 & c103 Base of the spine on the board with some good quality polypropylene items, Cant remember the values? little green elna things. lol! I tweaked a 300x to death! just to experiment, The poor little thing had eventually 80.000uf on the power rails, did all the usuals and had the thing singing, IEC'd to expensive big fat leads, Pushed it too far and it died : ( Just do the coupling caps, Dont waste time on anything else, Plus the PCB tracks are fragile so use a solder wick and take ya time!! Good amps!!!

Bob Says:
March 9th, 2016 at 8:23 AM

I have an A400 and find it OK but I also have an A445 and find it much better. The A445 has not been raved about as much as the 400 and so usually is much cheaper second hand. Great value when they come up.

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