Again I was able to participate in a group buy of these nice modules on the German diy-hifi-forum. Based on these modules I bilt a stereo amp to play with. There is the technical data from the manufacturer site:
- 2x500W into 2ohms at 1% THD
- 900W BLT into 4ohms at 1% THD
- Patented AMS (Adaptive Modulation Servo) amplifier technology
- Almost flat THD versus frequency plot
- 115dB dynamic range
- Automatic voltage doubler for universal mains
- Meets EuP and EnergyStar requirements
- CE approved
- +/- 17V DC AUX outputs
- AUX output for hanger channel
The AMS modules are the successors of the ALC modules. Comparison of the THD figues made me curios. High frequencies seem to have lower THD:
Here are some pics of my built:
For the enclosure I choose the Galaxy Maggio Rato GX283 230x230mm. On the pics I still had a potentiometer in the line to the LED since it was way to bright. In the meantime I replaced it for a fixed resistor (27K) so that the LED just glows.
I soldered the contactors for CON1: The crimp section I bent with a flat nose pliers around a fixing pin. Then I soldered the braid with a 1mm iron and 0,5mm solder. What a mess – their tiny size sould not be underestimated. Took me an hour to solder these eight connectors.
Next time I’d buy loose contactors with crimped cables. They can be bought at conrad.de:
- 748462-62 Braid with crimped connector (8 pcs. required for both inputs and LED)
- 740136-62 Housing 4 pole(for LED; 1 pcs. required)
- 740169-62 Housing 6 pole(for the L+R inputs; 1 pcs. required)
Just as reference (speaker connector CON3) which I also soldered:
- 741651-62 Crimp connector (4 pcs. required)
- 741592-62 Housing (1 pcs. required)
The amp gets only barely warm during operation. No plopp sound when switching on/off.