and labeled “+,” and the negative is color coded BLACK and labeled “-”. The positive terminal on the speaker will be color coded RED, or will be labeled “+,” “pos,” “positive,” “8 ohms,” or “4 ohms.” The negative terminal on the speaker will be color coded BLACK, or will be labeled “-,” “neg,” negative,” “C,” “Common,” “G,” or “ground.”

Note:Bridgedoperationrequiresdifferent loudspeaker connections. For details see the section Bridged Operation.

[8] Bridged Operation

In bridged operation the output of two stereo amplifier channels are “combined” to drive one monophonic speaker. In the bridged mode the GFA-6002 and 6006 wattage capability increases to 175 Watts at 8 ohms per bridged channel. The GFA-6006 allows for any of three adjoining “pairs” of amplifiers to be bridged. For input directions see the section Audio Signal Inputs and Outputs. To engage bridged operation for a pair of amplifier channels, switch the corresponding toggle switch to the bridged position. In bridged operation the proper loudspeaker connection is to the POSITIVE (+) terminals of each of the pair of bridged channels. Do Not connect the Negative (-) speaker terminals under any circumstances in the bridged mode.

[9] 3-30V AC/DC Triggering

The GFA-6002 and GFA-6006 are very high power amplifiers and as such must be directly connected to the wall outlet or an appropriate surge protector or AC line conditioner. It must never be connected to the “switched” outlets on the rear panel of a pre-amplifier. Usually, this would mean that when you turn on/off your pre-amplifier you would have to turn on/off your power amplifier separately. We have, however, provided the ability to control the OFF/ON function (actually “powering up” from standby) of the amplifier by a 12-Volt DC output jack on the rear of certain ADCOM pre-amplifiers and tuner pre-amplifiers. When using this feature the rear panel Power Switch must be left in the in “auto” position. To connect, you will need a mono-mini phone plug to a mono-mini phone plug cable of appropriate length (not included) to reach from the rear panel jack of the amplifier to the rear panel of the pre-amplifier. Contact your dealer for information on using this feature with ADCOM and other brand pre-amplifiers. Although 12V DC is optimal, the circuit will operate from approximately 3 to 30V AC or DC, not to exceed 250mA. The center conductor (tip) is positive. When using the 3-30V AC/DC triggering method the unit will return to standby approximately two

and one half minutes after the signal is no longer present.

Audio Signal Sensing

Alternately, the sensing of audio signal can turn on the 6002/6006 amplifier. Any time the amplifier detects the presence of an incoming audio signal it will “power up” from standby. Please note that the speed of “turn on” by AC/DC triggering and audio sensing is different. AC/DC triggering is slightly faster. When using the signal sensing method, the unit will return to standby approximately two and one half minutes after the signal is no longer present. An incoming signal level of 5-7 mV is required to trigger this sensing method.

[10] AC Fuse

The AC Fuse protects the electronic circuits of the GFA-6002/6006. This fuse, normally, will fail only if there is an overload within the GFA-6002/6006. It may, however, fail if the amplifier attempts to deliver very high power into very low-impedance loudspeakers. In either case, BE SURE TO REPLACE THE AC FUSE ONLY WITH AN EXACT REPLACEMENT FUSE.

10 ADCOM GFA-6006/02 Owner’s Manual

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Adcom GFA-6002, GFA-6006 owner manual Bridged Operation, Audio Signal Sensing, AC Fuse
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GFA-6006, GFA-6002 specifications

The Adcom GFA-6006 and GFA-6002 are distinguished power amplifiers renowned for their performance, reliability, and advanced technology. Designed for audiophiles and professional users alike, these amplifiers bring powerful sound reproduction and precision to any audio system.

The Adcom GFA-6006 is a high-performance, six-channel amplifier that is perfect for multi-channel audio setups. It delivers a robust output of 100 watts per channel into 8 ohms and can drive loads down to 4 ohms with ease. This feature is crucial for home theaters and multi-room systems where consistent power delivery is critical. The GFA-6006 employs a class AB design that ensures minimal distortion and a dynamic soundstage, making it ideal for both music and film playback.

In contrast, the Adcom GFA-6002 is a two-channel powerhouse, offering similar high-performance characteristics tailored for stereo applications. It pushes out 200 watts per channel at 8 ohms and maintains stability with 4 ohm loads. This model is designed with a high damping factor, which translates to better control over speaker motion, ensuring tighter bass and clearer highs. The GFA-6002 is particularly suited for critical listening environments where audio fidelity is paramount.

Both models feature Adcom's proprietary feedback circuits for improved linearity and reduced distortion across all frequencies. The amplifiers utilize a robust, high-current power supply and feature copper bus bars that enhance performance during demanding playback scenarios. Additionally, Adcom ensures the thermal stability of its amplifiers through efficient heat dissipation techniques, including ample heatsinking and strategically placed ventilation to prevent overheating during extended use.

The build quality of the GFA series amplifiers is substantial, with a rugged chassis that minimizes vibration and interference. The elegant yet functional design makes them a visually appealing addition to any audio system while being functional in various setups.

In summary, the Adcom GFA-6006 and GFA-6002 represent the pinnacle of amplifier technology, offering versatility, power, and fidelity. Whether users are seeking a multi-channel system or a dedicated stereo setup, these amplifiers provide the necessary performance and reliability. Their advanced features and superior audio quality reaffirm Adcom's reputation as a leader in high-performance audio equipment.
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