Stereo Integrated Amplifier (1990-91)
Power output: 50 watts per channel into 8Ω (stereo)
Frequency response: 5Hz to 100kHz
Total harmonic distortion: 0.03%
Input sensitivity: 0.2mV (MC), 2.5mV (MM), 150mV (line)
Signal to noise ratio: 69dB (MC), 87dB (MM), 108dB (line)
Output: 150mV (line)
Dimensions: 420 x 352 x 126mm
Price: GBP £240 (1991)
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Reviewed Nov 24th, 2016 by Vecino
I have had the A-400 for some 25 years. It is fantastic. Just one problem: nowadays it seems to be very difficult to tune it to a very low output. If I want an undistorted sound, I have to turn it up to (too) loud.
Reviewed Apr 04th, 2016 by dubstepic
I heard a lot about this amp. And when I seen it for sale cheap I bought it. Amazing detailed sound. Great soundstage and punchy bass. Some say it is bright. I heard brighter for example my Yamaha CA-510. Only bad thing I miss bass/treble corrections.
Reviewed Feb 05th, 2016 by Hallscool
Extremely good sound.
Works very well with digital or analog sources.
Reviewed Feb 28th, 2015 by VISHALFERNANDES
excellent amplifier. totally flat response.
Reviewed Oct 08th, 2014 by Simon Spiers
What you put into the input comes out of the output!
Phono stage is a bit coarse, used models will need the volume put replacing or at least cleaning.
Capable amp with great load tolerance lots of mods out there supposedly improving performance.
Used mine for 15 years now, still going strong.
A real good amplifier.
Reviewed Apr 10th, 2014 by Lawrence13
I have one from 1992, upgraded with the Tom Evans mod plus DNM slit foil capacitors when I stopped using it for a valve amp in 1999 ish for a valve amp I forgot all about it. Anyhow 2012 I go for the Lavardin IS and several weeks ago I upgraded to the IS ref and as the only valve I had left was lent out to a friend I dug out the trusty old Pioneer A-400 and was astounded just how good it still sounded, not as clean an open as the Lavardin but blimey it drove my twin Lowther horns a treat.
Now some say Lowther and horns due to their efficiency don't really go together with budget transistor amps but boy oh boy the pioneer sounded great fun with all music popping along , but no sign of harshness.
The Pioneer sounded so good that I was dreading getting my new Â£3,200.00 quids worth of Lavardin IS ref as I could be very disappointed.
Okay the Lavardin turned up last Friday and yes it does sound cleaner, more detailed than the Pioneer but the Lavardin is 35/45 watts per channel and the Pioneer sounded at fifty watts per channel far more powerful!!
So I would have no hesitation in sticking the Pioneer back in again as in some ways its preferable to the Lavardin.
Shhh...don't tell anyone I said that.
Reviewed Mar 30th, 2014 by fredy
Sorry for my bad English.
For me the best amp I've ever heard in its class and beating many of twice the price.
Unbeatable price-quality ratio.
Reviewed Jan 30th, 2012 by JaS
A good budget amp in it's day (around £250 in 1991), the A400 worked especially well with CD. The MM/MC phono stage was less impressive. The improved A-400X (£300) had numerous tweaks which left it smoother sounding but lost some of the punch and excitement of the original model.