Ramsey Electronics SHA2 - Manual (Page 19)

SHA2 • 19
SETUP AND TESTING
It’s time to apply power to your SHA2 and start listening to your line level
sources.
You
need:
• An AC adapter or a fresh 9 volt battery
• A line level audio source (CD player line out, etc.)
• A cable to connect the audio source to the SHA2. Either dual RCA to
3.5mm stereo or 3.5mm stereo to 3.5mm stereo, depending on what
connector(s) are on your line level source.
• Headphones
1. Connect your audio source to J1, the line level audio input jack.
2. Connect your headphones to either J3 or J4, the headphone outputs.
3. Connect your DC supply or 9 volt battery.
4. Turn on your line level source.
5. Turn on your SHA2. The LED, D3, should light and then go out after a few
seconds. Turn the volume up to a comfortable level.
6. You should be hearing your line level audio source at this point. Now try
the balance control, R12, and get the balance between left and right set
where you want it.
7. Try out the treble control, R10, and the bass control, R11, and set them
for the sound you want.
8. Next try pressing in S1, the loudness control. You should hear the
difference immediately. It almost sounds like a bass boost but you’ll notice
that the overall loudness increases too.
9. Plug another set of headphones into the other headphone jack and try
that out too.
When you first see your LED light you may think that it’s a power on indicator,
and it is temporarily when you first turn on the kit. After that it’s a clipping
indicator, showing you when the audio level is close to the maximum output of
the IC. During typical operation this LED will be off.
The buffered loop output, J2, allows you to connect the line level audio output
of your SHA2 to another device. You can set the SHA2 up so that the output
is directly coupled, just as if you had your line level source connected right to
the other device, or you can send the line level audio to another source with
the tone controls added. This is done using jumper headers H1 and H2.