The finger-to-nose test is not a standardized field sobriety test recognized by the National Highway Transportation Safety Administration (NHTSA). Because the NHTSA does not endorse the finger-to-nose test as a reliable indicator of mental and physical impairment, it holds less weight in court than a standardized test.
a channel is a output from the amp to the speakers or subs. if you have a 2 channel amp there is 2 outputs on the amp if you have a 4 channel amp there are 4 outputs this goes for all the amps whither it is a 1 channel,2channel 4channel or 5 channel. channel= output.
The operational amplifiers bandwidth is the frequency range over which the voltage gain of the amplifier is above 70.7% or -3dB (where 0dB is the maximum) of its maximum output value as shown below. Here we have used the 40dB line as an example.