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ADCOM GFA-555se Power Amplifier

ADCOM GFA-555se Audio Power Amplifier
The classic award winning amplifier design of the original GFA-555mkII has been reborn. The Adcom GFA-555 represents the most advanced thinking in audio amplifier design. It offers exceptional value and superior performance at a reasonable price. Being innovative is what keeps us going strong and achieving great things. Whether it's our iconic high current amplifiers or our cutting-edge digital processors, ADCOM components never fail to impress even the toughest crowds. As we keep pushing for better quality and performance, our components have scooped up more than 25 Product of the Year and Special Recognition awards from Audio Video International. On top of that, we've snagged 3 Diapason D’Or Awards, 7 Consumer Electronics Show Design and Engineering Awards, and we've been featured on Stereophile’s “Recommended Components” list 70+ times since 1988!

Original price was: $1,899.00.Current price is: $1,799.00.

ADCOM GFA-555se Audio Power Amplifier

Legacy

GFA-555se power amplifier represents the pinnacle of ADCOM’s audio engineering. This Nelson Pass design broke ground when it came out in the 80’s, getting rave reviews and providing tank-like reliability at a decent price. That these audio power amplifiers are still much in demand after so much time is a strong testament to their value and durability.

Better Sound Delivery

We have worked long and hard to ensure that the GFA-555se power amplifier improves upon its original eminent version in key areas, delivering even better performance. Externally, the chassis footprint and front panel design are identical to the original. Internally, all circuitry has been upgraded to meet ETL/ETLc, FCC, LVD and CE/EMC requirements using UL approved FR-4 printed circuit boards. High performance component selections include ultra low ESR electrolytic capacitors. The result of these improvements is lower distortion, better dynamic range, improved damping factor and greater stability and separation of individual instruments on the sound stage.

PRODUCT GALLERY

Key Features of the ADCOM GFA-555se Audio Power Amplifier

spec gfa555se - Adcom

Output Power

200 watts per channel, 8 ohms
300 watts per channel, 4 ohms
600 watts, 8 ohms BRIDGED

Frequency Resp.

@ 1watt, 8-ohms:
10Hz to 20kHz +0, -0.25dB

Power Bandwidth (-3dB):

1.7Hz to 100kHz

Input Impedance

100k ohms unbalanced
10k ohms balanced

Power:

120VAC & 230VAC / 50-60Hz

Max Dimensions

7-1/2” x 12-1/2” x 17”
191mm X 318mm X 432mm

Weight

36lbs (16.3kg)
Shipping weight:39lbs (18kg)

Input Sensitivity

1.75V rms, 200W into 8 ohms.
130mV rms, 1 W into 8 ohms.

Damping Factor

≥ 900, 20Hz to 20kHz.

Note: For more technical specs, please refer to the attached user manual & Spec
Download User Manual & Spec
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Q & A

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Can you run two REL subwoofers off the speaker terminals of the Adcom 555se? Kevin Kraska asked on February 16, 2025

two REL subwoofers, how many watts and ohms per speaker?

 Adcom answered on March 16, 2025 store manager
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What Adcom pre-amp should I pair with this power amp (GFA-555) David Robertson Jr. asked on February 16, 2025

GFP-915 can paired.

 Adcom answered on March 16, 2025 store manager
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I would like to know with great interest foes your company ship to Imdonesia? Thank You Graeme Graeme Limdsay asked on January 13, 2025

Can ship to Indonesia, please contact info@adcom.com

 Adcom answered on March 16, 2025 store manager
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Where can I find the ACE -515 AC enhacer Julio Castillo asked on October 3, 2024

The ACE-515 is out of stock. There is a new model, the ACE-615, Please contact info@adcom.com

 Adcom answered on November 4, 2024 store manager
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How do I hook up 4 speakers to this amplifier? Darrell asked on August 31, 2024

4 speakers If 2 speakers per channel If all 8 ohm impedance speakers are connected in parallel, the total impedance is 4 ohms If all 4 ohm impedance speakers are connected in series, the total impedance is 8 ohms Recommended total impedances are 4, 6, and 8 ohms.

 Adcom answered on September 2, 2024 store manager
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Review

5.0
Based on 11 reviews
5 star
100
100%
4 star
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James N.
Verified OwnerVerified Owner
5/5

Clean power to drive my floor standing speakers.

5 months ago
shawn mosser
Verified OwnerVerified Owner
5/5

Great service/product as always. This is my 2nd 555se I have purchased, I love these newly designed amps, they sound amazing.

5 months ago
Greg
Verified OwnerVerified Owner
5/5

Amazing amplifier. Getting technical support is a bit hard with only email available. For a high end product when there is a problem I should have someone I could call.

6 months ago

11 reviews for GFA-555se

  1. Noah –

    All of the pro’s of the original GFA-555 and improved model GFA-555 II plus the GFA-555se includes toggle switch selectable single-ended RCA or XLR inputs which are TRUE balanced differential inputs (*confirmed by the factory engineers). Clean design, simple signal-path, heavy duty power supply (no inexpensive ‘switching power supply” as many others use) , class A/B operation and great performance for the price.

  2. Joaquin Chang –

    I have the pair (GFA 555SE- GFP 915) and I love them, awesome sound, running with Magnum Dynalab ft101a etude tuner , Philips 880 cd player, Nakamichi CR 1A cassette player, Polk audio Monitor 10 b series 2 speakers, music comes through with impeccable quality, clarity ,and sound staging. these are a winner give a listen!!

  3. Ismail –

    The GFA-555se offers excellent dynamic performance. One can clearly appreciate the pop or attack when a drum stick hits the snare or hear a rim shot. Low level dynamics, the quiet shifting of intensity of a voice, or the way Brad Paisley changes the force with which he plucks almost every guitar string, is apparent and enjoyable

  4. Kai –

    The Adcom GFA-555se may lack a few of the circuit niceties that are now part and parcel on modern amplifier designs – such as a standby circuit, for one – but it punches so far above its weight when it comes to must-haves such as high power, low noise, low distortion, extraordinary extended frequency response and, of course, superb sound, that it deserves to be included on the ‘must-listen list’ of anyone in the market for high-quality, high-fidelity power amplification

  5. Anonymous (Verified Owner) –

    A smooth and clean sound.

  6. Denis Wood (Verified Owner) –

    Fabulous!

  7. Jimmy B. (Verified Owner) –

    Plenty of power and sounds great.

  8. Pete M. (Verified Owner) –

    Good Clean Powerful Amp

  9. Greg (Verified Owner) –

    Amazing amplifier. Getting technical support is a bit hard with only email available. For a high end product when there is a problem I should have someone I could call.

  10. shawn mosser (Verified Owner) –

    Great service/product as always. This is my 2nd 555se I have purchased, I love these newly designed amps, they sound amazing.

  11. James N. (Verified Owner) –

    Clean power to drive my floor standing speakers.

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