"To start I really cannot say enough
about the service at AmpsLab, Mike is without a doubt one
of the best people I have ever dealt with. I cannot thank
him enough for his help in my project.
decided to build a 3-channel amplifier to make a true 2.1
home stereo for music listening. The Hx100 being able to
supply 150 watts RMS is quite stout and able to supply a
4 ohm main speaker or a subwoofer. It is also a fairly compact
design and allows for a smaller chassis. I used a 750VA
transformer and 4 ultra fast rectifier diodes in a home
made bride rectifier filtered with 34,000uF of capacitance
made form some surplus industrial parts I had laying around.
I also decided to add some input attenuation so that I could
use any generic line level output as a source. I used some
RK series Alps potentiometers for the stereo balance control
and subwoofer level and a Noble balance control for stereo
balance. I packaged everything up in an all aluminum chassis
I purchased from Par-metal products. I use a stereo 2- way
crossover with mono LF output to generate the subwoofer
The assembly of the Hx100 was pretty strait forward; I have
never built an amplifier before and struggled with a few
things. Mike was very helpful and had the answers on the
spot, once I had my channels individually tested I installed
them one by one into the chassis and rechecked the bias.
The design of this module makes the initial setup and adjustment
very simple. I also found this design very efficient and
easy to manage thermally. The 450 watt setup I have does
not require a fan.