STATUS
- AVAILABLE
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Description :
The
Adcom GFA 5800 is unlike most amplifiers as it uses only MOSFETs in the signal
path. It is designed by Nelson Pass who designed other brands of amplifiers
like Threshold and Passlabs. Besides the well reviewed Adcom GFA-555, Nelson
Pass had called the GFA 5800 that he designed the best sounding amp Adcom ever
made. In the GFA 5800, there are no bipolar transistors anywhere. It also simplifies
the signal path by using only three gain stages. It has most of the detail and
sweetness of high-end tube amplifiers, and the power, control, deep bass and
flat treble response of solid state amplifiers. The Adcom GFA 5800 is high current
and powerful enough to drive any 4 ohm speakers with ease to deliver audiophile
sound and ultra-reliable performance.
The Adcom GFA
5800 delivers a sense of realism that is usually only found in high-end amplifiers.
It is marvelous at extracting and parsing the details that would normally have
been too blended into the background to matter. Incredibly detailed, lush sound
with excellent grip and control, it can properly reproduce the top-end air without
becoming the least bit fatiguing. Bass will become especially dynamic and less
distorted. It offers a silky smooth mid and treble range that is as articulate
as one could hope for without its becoming forward and "sizzly" on
the top, and a combination of cleanness and smoothness through the midrange.
It exhibits a good amount of dynamic range and very precise beats and rhythms
that some amplifiers with a lesser degree of control have a hard time with.
Acoustic music, especially brass instruments and strings, sounds very compelling
and lifelike. Vocals and guitar have a very smooth and easy quality without
a loss of detail. Unfortunately, it is also very honest to the music and does
not cover the shortcomings of poorly recorded music well. The Adcom GFA 5800
is clear and very compelling on good recordings, but terrible on poorly recorded
music.
Specifications :
Power Rating(250 watts)...................Continuous average power into 8 ohms
at any
...................frequency
between 20Hz and 20kHz with both channel
...................driven
at less than 0.18% total harmonic distortion
Power Rating(400 watts)...................Continuous average power into 4 ohms
at any
...................frequency
between 20Hz and 20kHz with both channel
...................driven
at less than 0.18% total harmonic distortion
Intermodulation Distortion(SMPTE)....1 watt to 250 watts into 8 ohms, <=0.05%
....1
watt to 400 watts into 4 ohms, <=0.05%
Intermodulation Distortion(CCIF)........250 watts to 8 ohms. Any combination
from 4kHz to 20kHz
........400
watts to 4 ohms. Any combination from 4kHz to 20kHz
Total Harmonic Distortion + Noise.....20Hz at 0.018%. 250 watts into 8 ohms.
Typical.
......1kHz
at 0.02%. 250 watts into 8 ohms. Typical.
......10kHz
at 0.07%. 250 watts into 8 ohms. Typical.
......20kHz
at 0.13%. 250 watts into 8 ohms. Typical.
......20Hz
at 0.018%. 400 watts into 4 ohms. Typical.
......1kHz
at 0.02%. 400 watts into 4 ohms. Typical.
......10kHz
at 0.08%. 400 watts into 4 ohms. Typical.
......20kHz
at 0.16%. 400 watts into 4 ohms. Typical.
Frequency Response.......................10Hz to 20kHz. +0, -0.25dB at 1 watt
into 8 ohms
Power Bandwidth.............................-3dB, 3Hz to 130kHz
Dynamic Headroom Into 4 ohms........2.1dB
Signal-to-Noise Ratio........................>=100dB, 250 watts into 8 ohms,
"A-weighted"
Gain...............................................Unbalanced Input: 29dB
...............................................Balanced
Input: 26dB
Damping Factor...............................>=1100 (20Hz to 20kHz)
Rise Time.......................................2.2 microseconds (5kHz, 127V
peak to peak square wave, 20% to 80%)
Power Consumption........................Quiescent: 250VA. Continuous, both
channels driven
.........................Maximum:
1800VA. Continuous, both channels driven
.........................250
watts into 8 ohms, 990VA. Continuous, both channels driven
.........................400
watts into 4 ohms, 1560VA. Continuous, both channels driven
Power.............................................230VAC, 50 to 60 Hz
Dimensions(w x d x h)......................43 x 37.5 x 21.5 cm
Weight............................................27kg
Miscellaneous :
Matching.........................................Adcom GFP-750 Preamplifier
XLR Input........................................Yes
Made In...........................................USA
Condition.........................................8/10
Product Information :
http://www.hifiengine.com/library/adcom/gfa-5800.shtml
(Manual, requires registration)
http://en.wikipedia.org/wiki/Nelson_Pass
(Designer Nelson Pass)
Reviews :
http://www.audioreview.com/cat/amplification/amplifiers/adcom/gfa-5800/prd_116268_1583crx.aspx
http://www.audiokarma.org/forums/archive/index.php/t-131071.html