STATUS - AVAILABLE
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Description :
The Adcom GFA 5500 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. In the GFA 5500, there are no bipolar transistors anywhere. It also simplifies the signal path by using only three gain stages as opposed to 5 like many competitors. The amplifier has a very high dampening factor and is also a high current design. Unlike the similarly output power GFA-555 model, the GFA 5500 cannot be bridged and it has no XLR inputs. The Adcom GFA 5500 on is said to have fast transient response due to it's improved class A front end and MOSFET outputs. The MOSFETs draw alot of power and it doesn't matter if the amp is pushing music or just sitting idle, it still drains the same amount of juice.The 5500 also gets notably hotter due to the MOSFETs, and ventilation is thus a bigger concern. The Adcom produces a very deep and wide soundstage. Detail is excellent without being too bright like some competitors.

Specifications :
Power Rating...................................200 Watts continuous average power into 8 ohms
                   ...................................350 Watts continuous average power into 4 ohms
IM Distortion (SMPTE)......................1 watt to 200 watts into 8 ohms.....< 0.05%
                                ......................1 watt to 350 watts into 4 ohms.....< 0.05%
IM Distortion....................................200 watts into 8 ohms.....<0.035%
                  ....................................350 watts into 4 ohms.....< 0.035%
THD + Noise @ 200w 8 Ohms..........20Hz.....0.018%
                                            ..........1kHz.....0.020%
                                            ..........10khz.....0.070%
                                            ..........20khz.....0.130%
THD + Noise @ 200w 4Ohms...........20Hz.....0.018%
                                           ...........1kHz.....0.020%
                                           ...........10kHz.....0.080%
                                           ...........20kHz.....0.160%
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.......1.7dB
Signal to Noise Ratio........................> 100dB (A Weighted 200 watts into 8 ohms)
Gain...............................................29dB
Input impedance..............................49.9k ohms
Damping Factor 20Hz to 20kHz.........> 700
Rise Time........................................1.5uS (5kHz, 120V peak-to-peak square wave, 20% to 80%)
Power Consumption..........................192VA (Quiescent)
                             ..........................1440VA (Maximum)
                             ..........................660VA (200 watts into 8 ohms)
                             ..........................1165VA (350 watts into 4 ohms)
Power Voltage..................................115/230VAC 50/60Hz
Dimensions(w x d x h)......................43 x 37.5 x 18.5 cm
Weight............................................20kg

Miscellaneous :
Made In...........................................USA
Condition.........................................7/10 (Rusty top cover)

Product Information :
http://www.users.interport.net/a/d/adcom/gfa5500.html (Specifications)
http://www.manualslib.com/manual/1898/Adcom-Gfa-5500.html (Manual)

Reviews :
http://www.audioreview.com/cat/amplification/amplifiers/adcom/gfa-5500/prd_116267_1583crx.aspx
http://www.avsforum.com/forum/90-receivers-amps-processors/1207124-adcom-gfa-5500-vs-gfa-555-ii.html
http://www.hometheaterhifi.com/volume_3_3/v3n3k.html
http://www.amazon.com/Adcom-GFA-5500-Current-Power-Amplifier/product-reviews/B000BNGICA