packedwiththeoptionalrackmountadaptorsformo reinformation.

CONNECTING THE GFA-555ms

TheoptimalperformanceoftheGFA555mswillultim atelydependonthecarewithwhich youperformtheconnectionstotheamplifier,thep reamplifierandtheloudspeakers.Allthe inputandoutputsignalconnectionsshouldbemade onlywithhighquality,lowlosscables followingtherecommendationsmadeintheindividua lsectionsbelow.Pleaserefertothe rearpaneldiagramtoidentifyalltheconnections andtheirlocations.

NOTE

WHENEVER CONNECTIONS TO OR FROM THE GFA-555ms ARE BEING MADE, BE CERTAIN THAT THE POWER SWITCH ON THE AMPLIFIER IS IN ITS OFF POSITION, THE AC LINE CORD OF THE AMPLIFIER IS DISCONNECTED FROM THE AC WALL OUTLET AND THAT ALL ASSOCIATED COMPONENTS ARE TURNED OFF.

RIGHT/LEFT INPUT

 

 

 

TheaudioinputstotheGFA555msarethroughtwoh

 

ighquality,goldplatedbrassRCA

jacksusingTefloninsulationtominimizehighfreq

uencylosses,noise,etc.Theywillaccept

standardRCAtypeplugs,oneforeachchannel,LEFT

 

andRIGHT,usuallysuppliedatthe

ends of interconnecting cables. To insure that the

 

performance designed into the

GFA555msispreserved,youshouldusethehighest

 

qualityplugsandcableasarefeasible.

There are many cables which are designed specifical

 

ly for these applications and your

ADCOMdealercanbeofhelpinselectingthebestc

 

 

ableforyourapplication.Whatever

cableyoufinallyselect,itshouldhavelowcapaci

tance.Thisisparticularlyimportantifyou

usealongrunbetweenthepreamplifierandtheamp

 

lifierorifyourpreamplifierhasahigh

outputimpedance. Generallyspeaking,acablewith

 

acapacitanceofaround100pF will

workwell.

 

 

 

The load impedance which the GFA555ms inputs prese

nt to the source preamplifier is

100,000ohms. Thisloadimpedanceresultsinminima

 

lamplifier noiseandis morethan

adequateforusewithanyassociatedsourcecompone

 

ntregardlessofitsoutputimpedance.

Topreservethecorrectstereophoniceffects,pleas

ebecertaintoconnecttheleftoutputof

the preamplifier to the RCA jackonthe GFA555ms l

 

abeledLEFT INPUTand theright

outputofthepreamplifiersectiontotheRCAjack

labeledRIGHTINPUT.

RIGHT/LEFT STEREEO SPEAKER OUTPUTS

 

 

 

TheGFA555ms'sconnectionstotheloudspeakersare

 

madethroughhighgrade5way,

goldplated brass bindingpost terminals located on

 

the rear panel. These terminals will

Page 6
Image 6
Adcom GFA-555MS manual RIGHT/LEFT Input, RIGHT/LEFT Stereeo Speaker Outputs

GFA-555MS specifications

The Adcom GFA-555MS is a high-performance power amplifier that has established a reputation for its reliability and excellent sound quality. This amplifier, developed by Adcom, an American audio company known for producing high-quality audio components, is often sought after by audiophiles and professionals alike for its unique features and robust build.

One of the standout characteristics of the GFA-555MS is its impressive power output. With a continuous power rating of 200 watts per channel into 8 ohms, and even more when driving lower impedances, it provides ample power to drive a wide variety of speakers. This ensures that users can enjoy dynamic sound reproduction, whether they are listening to music at moderate volumes or cranking it up for a party.

The GFA-555MS is designed using a high-current, Class AB topology, which strikes a balance between efficiency and sound fidelity. This design allows for clean, detailed audio reproduction while minimizing distortion. The amplifier is renowned for its ability to handle complex musical passages and reproduce them faithfully, making it a favorite among music lovers who appreciate the nuances of their favorite recordings.

Another notable feature is its advanced thermal management system. The GFA-555MS is equipped with substantial heat sinks and a robust power supply that allows it to operate efficiently without overheating. This is particularly beneficial for sustained listening sessions or when driving demanding speaker loads.

In terms of connectivity, the GFA-555MS offers various input options, including RCA and XLR connections, making it versatile enough to integrate into a range of audio systems. This flexibility is complemented by its exceptional build quality, with a solid chassis that not only enhances durability but also minimizes vibrations that could interfere with sound quality.

The amplifier also includes additional features such as DC protection circuitry and a comprehensive output stage protection system. These safeguards help protect both the amplifier and the connected speakers from potential damage due to short circuits or overheating.

Overall, the Adcom GFA-555MS stands out in the realm of audio amplifiers. Its combination of power, sound quality, and advanced technologies make it a preferred choice for both casual listeners and serious audiophiles. Whether for home theater setups or music playback, the GFA-555MS delivers performance that is hard to match, making it a true classic in the audio world.