Question about Adcom GFA-5400 2-Channel Amplifier

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How to bridge GPA 555 adcom amp from 8 om to 4 om

I need a diagram if posible

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First of all, when bridging an anp, the impenence that it can handle usually goes UP not down. I don't believe that the GPA555 can be bridged without circuit modification.

Dan

Posted on Feb 11, 2009

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1 Answer

I want to bridge 2 adcom GFA 555 amps to my sony DA7ES any suggestions


Obviously you are going to use the Front pre-out's on the Sony to drive the Adcoms. its pretty straightforward, just do not use a speaker that is less than 8 ohms. and make sure that you always have the power switch off on the adcoms, let them sit off for 5 minutes, THEN hit the bridge switch on the back of the adcom's and follow their instructions for bridging. it's pretty easy and tough to go wrong. Good luck...Rob

Apr 18, 2015 | Adcom GFA555 Amplifier

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Can I run two stereo amps from same preamp?


yes, and do tell, what speakers are you powering with these amps?

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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

2 Answers

On the inside back wall of the 1986 Adcom GFA-555 Stereo Power Amplifier there are four fuses,two for each channel. Would you tell me please, what amp fuse they are and if they are the fast or slo-blow...


Sorry to contact you this way but i've spoken to an older colleague of mine and it appears that before 1992 in the Adcom GFA-555 they were using bipolar transistors and the amp was rated fo a minimal impedance of 4 ohms - not like in the newer ones that have MOSFETs and are rated for 1 ohm in bridge mode. So the fast fuses that you need are of 6 amps , not 20 like in the newer models.
Sorry for my mistake.

Jul 11, 2010 | Audio Players & Recorders

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.

Dan

Sep 14, 2009 | Adcom GFA-5400 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

1 Answer

Adcom input jack replacement


The input jacks on a 555 are a standard gold plated, high quality jack. looking around the net, you should pay no more than 7-10 dollars each ( or just get originals from Adcom. ). What is your comfort level with electronics?. Can you solder properly?. I cant answer this without more info.....thanks...Good luck...Rob

Dec 30, 2007 | Audio Players & Recorders

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