AMC 2445 2/4 Channel Amplifier

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"The AMC 2445 is a multi-channel amplifier designed to reproduce true to life audio signals with wide-range of speakers.

Its rugged design and discrete output devices are capable of delivering high output current, which is demanded by low impedance speaker loads and exhibited by virtually all comptemporary loadspeakers.

It can be bi-wired in 4-channel mode for high quality sound reproduction, bridged for operation as a 2-channel stereo amplifier, or used as a multi-room distribution amplifier.

Moreover, each input has independent level controls for accurate balancing of individual audio systems.

Applications and features:
• 45 Watts x 4 OR 90W x 2 RMS @ 0.03% THD
• High current discrete multi-channel amplifiers
• Two individual power transformers with excellent grounding designs
• Individual channel level controls
• Auto power on/off by audio signals, 3-30v ac/dc trigger or constant with 12v dc trigger output
• Switch between 2 ch or 4 ch by mode switch
• Remote power-on switching via signal sensing or voltage trigger
• 12v control output for switching auxiliary devices on/off
• 5-way binding posts
• Multi-voltage power transformer passed all international safety standards by simply changing jumper wires, 2445a can be used internationally with different power supply voltages"

Approximate Age:

2001

Recommended Cables:

Kimber Kable - RCA Interconnects - Better

Kimber Kable - RCA Interconnects - Best

Kimber Kable - Speaker Cables - Better

Kimber Summit Series Monocle XL Speaker Cables (PAIR) - Best

Kimber Summit Series BiFocal XL Bi-Wire Speaker Cables (PAIR) - Best If Applicable 

Testing Process:

The SkyFi Testing Process for Solid State Amplifiers:

We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR.

If the amplifier passes visual inspection, we move on to a controlled power on sequence using a Sencore safety analyzer to monitor current draw in real time. Once the amplifier is determined to be safe to operate, we connect it to full AC mains for function and power testing. We connect the speaker outputs of the amplifier to a Sencore PA81 Power Analyzer which acts as a dummy load, DC offset monitor, and oscilloscope interface. We start with a low level 1KHz test signal at the amplifier’s input and slowly increase its amplitude while monitoring the output on an oscilloscope for signs of noise, clipping, distortion, or improper channel balance. We continue increasing the signal level until the amplifier reaches clipping. At this point we take an output power measurement and compare it to the spec sheet of the amplifier to verify proper performance. If the device under test has both balanced and single ended inputs they are both tested at this time. We finish off the bench evaluation with a 1KHz square wave check and a 20Hz to 20KHz sine sweep to assess the amplifier’s frequency response characteristics. This battery of tests will usually reveal if the amplifier has any issues that need further attention.

Before the device leaves the bench, we perform a listening test with actual music using a variety of preferred test tracks. Our benches are outfitted with familiar monitor speakers which help us identify inconsistencies that will not always show up on our test gear. The main things that we are listening for are hum or noise with no signal present, proper center image, clicks, pops, or any other obvious undesirable audio characteristics.

If the unit passes all of these tests it is moved to our long term testing rig where we simulate real word operating conditions for 6-8 hours. This allows us to monitor the unit for signs of thermal runaway or intermittent issues that only crop up when the unit has fully come up to temperature.