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The GFP-750 is part of a series of ultra-high performance separate components from Adcom. It shares this position with our exciting GFA-5802 power amp and GCD-750 CD player. All three of these components were conceived under Adcom's long standing philosophy of providing exceptional performance for the money. But our goal was to go beyond delivering exceptional performance and value, to the "next level"; by delivering the sonics and effortless power, along with the finesse and sophistication of units costing two to three times as much. The fact that we exceeded our own expectations is a testament to our engineers' diligence and their unswerving dedication to these goals.

The preamplifier's role

From a design standpoint the proverbial audio component "acting like a piece of wire, but with gain" is always (or should always be) the goal. But approaching that goal is, in reality, an incredibly difficult task. With the GFP-750 we believe we've come significantly closer to this ideal than anyone near this price category has ever come before.

The preamplifier is "control central" for any system. It provides source selection, adds gain when necessary, lets you adjusts levels, balance, and other parameters, and sends the signal off to the system's "engine room", the power amp. As the switching and control center, the preamp must be extremely quiet and distortion free. Because the signals it receives and then sends out to the power amp will be multiplied hundreds of times before you hear them. So if the preamp changes the signal in any way, it'll be magnified big time when you finally hear it! Fundamentally then, a great preamp must allow control flexibility and source selection, while adding or taking away nothing from the original source.

Choose active or passive control

The GFP-750 can be operated either as a completely "passive" (no gain) unit, with absolutely minimal sonic impact, or as a sophisticated active (utilizing active components and providing gain) preamplifier. In passive mode the GFP-750 is strictly a "line level input switcher", with its high quality four gang volume attenuator that lets you adjust the volume. While its active circuitry is both unique and superb (details later), you always have the option of using the GFP-750 in this ultimate passive mode, for control with maximum fidelity.

Adcom's passive approach

Any "line level" source that you have (CD player, tuner, DVD player {audio output}, tape deck, etc.) can be directed through the GFP-750 in the passive mode. The only effect the GFP-750 will have on the sound is volume adjustment, using the built-in precision four gang volume attenuator. In this mode the GFP-750 adds no noise, no distortion, in fact, it changes nothing. So, as far as your ears are concerned, it's sonically invisible. And that's our goal, isn't it?

But what if you need the active capabilities of the 750? Do you sacrifice fidelity for convenience and added control? Read on and see why you don't.

Adcom's active approach

The engineering design specifications for the GFP-750 were simple:

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