Review: Forte Model 4a Amplifier


Category: Amplifiers

The Forte Model 4a is clearly a gotta have amplifier. It is 50 Watts RMS per side in Pure Class A configuration.

Forte was the sister line to Threshold and with that being said much of the Threshold technology found it's way into the Forte product line. Such as the Forte 4a with its IGBT technology,which Threshold used in its T series of Power Amps.

The Forte 4a may only be 50 Watts per side,but what a glorious 50 per side it is. That is into 8 0hms,into 4 ohms it is 100 per side. During it's heyday the Forte 4a was compared against the Levinson 23.5,the VTL 225w, Muse Model 100 and other high end contenders of the day. In particular Corey Greenbery of Stereophile was more than duly impressed(Vol 15 No.11) as was Robert Hartley(Vol.16 No.7)

What was so impressive about this amp.,was its ability to deliver the music and without the slightest hint of strain. Always sounded much more powerful than the 50 per side it stated.

This amp clearly delivers the music with a transparency and detail that is hard to imagine unless you have heard it. Being Pure Class A the Forte has a sonic signature,that is agile,sweet and delicate,without a trace of the usual solid state forwardness,grain and glare were totally absent. Handles complex musical passages with a delicacy not often heard. No doubt the Forte 4a has in my opinion a damn near perfect balance of liquidity and resolution.

I listen to mostly Contemporary Rock N Roll,Jazz and Classical. This amp.,in short is just a dream to listen to. It's ability to retrieve the audio signal and pass it through to the speakers is very special indeed.

Being the jaded audiophile I am it is very hard to impress me with anything.Been in this hobby since 1957 and now 59,have just about heard and seen it all. The Forte Model 4a duly impresses. I was totally surprised by it's performance.

When new this amp had a retail of $1,790.00.They can be had in the secondary for about $400.00 to $600.00. Trust me,these prices on the Forte Model 4a wont stay this low for long. Once the word gets out on this amp.,the used prices will start moving up quite quickly. So if you have the need for a Pure Class A amp.,at what I now consider a giveaway price. Get one soon. At this point in time the Forte Model 4a is an outright steal at todays secondary market prices.

Make no mistake this amp.,can compete with any Pure Class A amp out there today.Like any Class A amp.,it runs hot and will need plenty of ventiliation. In my opinion it just doesn't get much better than this.

The difference between the Model 4 and Model 4a, is that the 4a has balanced inputs. Sonic signature is the same.

Associated gear
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Similar products
Threshold,Spectral,Levinson,Citation,Sumo,etc

ferrari

Showing 2 responses by marktime

FYI the IGBT transistors used in these have substitutions of the same type of device and should work fine. IE the
2SC3281/2SA1302 are available still from Motorola in the
number MJL3291/MJL1302 are still in production are meant for audio. They are also available in Matched pairs. BTW
love my Forte 3 great sounding as well.
I am not sure where the people who are posting that the
IBGT transistors are no longer available but this is
fictional. Possibly the same exact device say 2sc3281 is not in production, however there are present day versions
for a full replacement of this device made by both
Toshiba ( the orignal manufacturer )as well as Motorola
and others that are in many ways as good if not better.
IE a second generation of IGBT's that are even more
reliable than the previous device. The new Motorola IBGT's
are in particular aimed at and designed for low distortion
audio . Just wanted to clear up some confusion. I presently own a pair of 3's and love em. Open clear
with the advantages of mosfet by bi polar qualities as well
(IE tube like sound due to limited stages and very limited
negative feedback).. For any interested check out the
DIY.com group. The IGBT is far from dead.
Cheers