Question about Amplifiers & Preamps

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Just buy an amp

My name sy i just has buy an amp adcom gfa 555ii 2 channel do i need an preamp to able for this amp to work ??? help help please

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Yes, -- the GFA555ll is a power amp that needs a pre-amp for control. A good recommendation would be GTP500 pre-amp

Posted on May 29, 2008

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Bridge adcom gfa-5500


not unless it has a Bridge switch OR you design an inverter circuit for one of the inputs. If it has XLR inputs you can try to invert pins 2 & 3 on one of them, that might work...

Aug 12, 2012 | Adcom GFA-5500 2-Channel Amplifier

1 Answer

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


The manual does not specify a bridging option.

http://www.audioreview.com/cat/amplification/amplifiers/adcom/gfa-5300/prd_116265_1583crx.aspx

"Weaknesses:
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

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

Adcom GFA-7400 power amp; 1 dead channel (thermal protect LED on)


Hi...

I've contacted ADCOM before and they sent a pdf of the electricals

http://www.adcom.com/default.aspx

also try:

www.stereomanuals.com

Mar 30, 2010 | Adcom GFA-7400 5-Channel Amplifier

1 Answer

I turn on the ADCOM GFA-5802 amplifier... ...The power light comes on, but does not heat up nor output sound


Have it serviced. Do you know what GFA stands for. People at Adcom do have a great sense of humor. Take it only to a high end audio servicer. Contact Adcom. This is good stuff you wouldn't want a hack working on it.

Nov 23, 2009 | Adcom GFA-5802 2-Channel 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.

Dan

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

1 Answer

Can you bridge an adcom GFA-5802 power amp?


Running an amp in bridge mode requires a specific circuit design. It is not possible to combine 2 amps in this fashion.
Dan

Mar 02, 2009 | Adcom GFA-5802 2-Channel Amplifier

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