Question about Adcom GFA-5400 2-Channel Amplifier

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Adcom GFA-5400 installation

There is only one set of speaker outputs on this amp, can I hook up multiple speakers to the single set of terminals or do I need to use something like a Niles MSA-10A. The only issue that I have with it is that I fear that sound quality will suffer, plus I have two sets of small Energy speakers and then a larger pair of MKs that I want to hook up. How do I hook up a sub to this?

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Re: Adcom GFA-5400 installation - Adcom GFA-5400 2-Channel Amplifier Amplifiers & Preamps


Posted on Jan 13, 2009

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Re: Adcom GFA-5400 installation

Use the niles for more than one speaker hookup. As far as the sub hookup, use a powered sub with speaker inputs
then use the right or left speaker and tag a couple wires to the sub. Good Luck

Posted on Dec 29, 2007

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How do you connect wiring to bridge an adcom gfa 5300?

The manual does not specify a bridging option.

Not bridgable."

Generally an amp that IS bridgeable uses the positive speaker terminals and some switching method to tell the unit to run as bridged. This is NOT a recommendation to try it on the 5300.

Aug 02, 2011 | Adcom GFA-5300 2-Channel Amplifier

1 Answer

One channel thermal overload stays lit and no output from that channel. even after unit sits overnight, thermal light on immediately,unit not hot. Looking for schematic?

Red light is on if:
- thermal protection, overheated amp, bad thermo sensor
- DC at speaker terminals
- high current at output transistors
Also could be a protection circuit malfunction.
In any case you need new channel module or send your module or whole amp for repair here.

Jul 12, 2011 | Adcom GFA-7607 7-Channel Amplifier

1 Answer

Is a Adcom GFA-7500 5 channel power amplifier bridgable?

no this AMP is not bridgable to get more power out of this amp you need 4 ohm speakers.

Power rating
1 - 150 watts into 8 ohm speakers
1 - 225 watts into 4 ohm speakers

Feb 23, 2011 | Adcom GFA-7500 5-Channel Amplifier

1 Answer

When turning on you hear thumping sound from speakers turning off aswell i am using very efficient speakers

This sounds like an electrolytic capacitor that's discharging. Follow the wires from the speaker terminals in the amp to the PC board. This should lead you to the main amp board. If you look around it you might see what is called speaker coupling capacitors. I reckon they could be a bit larger than others and be around 220 to 470UF or perhaps higher. These capacitors will be the last thing the signal goes through before the output goes to the speakers. They can cause that. Otherwise it could be a capacitor in the power supply section.

Aug 24, 2010 | Adcom GFA-5500 2-Channel Amplifier

1 Answer

Whent turn up the valume sound whit no power

I would contact Adcom for a service place near you

Feb 17, 2010 | Adcom GFA-5400 2-Channel Amplifier

1 Answer

Convert a 4 om amp to play w/8 om speaker

Connect the two speakers in parallel. That will present a 4 Ohm load to the amp.


Sep 14, 2009 | Adcom GFA-5400 2-Channel Amplifier

1 Answer

Adcom GFA-5002 is dead no lights, no anything

Check the Fuse. Unplug the AC first. If you replace the fuse and it blows again, disconnect all speakers, replace the fuse and turn on. If the fuse does not blow, chances are it is a speaker problem, Adcom builds some very solid product, I would suggest pulling the outdoor speakers and testing them.
Depending on what you are using, some outdoor speakers should never be taken out of the living room. If you still have an issue post a comment and I will help some more.

Jun 24, 2009 | Adcom GFA-5002 Amplifier

1 Answer

How do i bridge an adcom gfa 5400

This amp is not designed to be bridged and can not be used in the mode you wish. Sorry, but internal circuit changes would be necesary for the amp to work as a single channel.


May 01, 2009 | Adcom GFA-5400 2-Channel Amplifier

1 Answer

Adcom 7500, Adcom 5400(bi-amp), Marantz AV-9000, Dakiom HA103

Try just the power amp on ..nothing connected
no Dakiom thingy either. It's a matter of elimination. Start at the output device and work back. Keep the Dakiom out of the loop.
If there's hum with just the Adcom..then it's the ADCOM

Mar 25, 2009 | Adcom GFA-7500 5-Channel Amplifier

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