5
Quick Start
Placement – Place the BLX-1K in a convenient position in or on the rack but
as close as possible to the unbalanced audio signal source. Keeping the
distance as short as possible will keep the possibility of picking up any
unwanted noise down to a minimum. Make sure signal wires are not
parallel to the 24 VAC power transformer wire to ensure that isn’t a noise
source in the system.
Wiring – The Balanced Input /Output jack (Ethernet jack) expects a T-568B
wiring configuration. Stick with this scheme to ensure you’re sending and
receiving the matched pairs.
Gains – Leave in the default setting (Unity Input Gain and -0 dB Output Level)
for best signal to noise ratio in common 10 - 75 foot run applications.
With the default settings, there is no increase of gain applied to the input
stage and no reduction of gain on the output side.
If you need to send your signal further, then you might increase the Input
Gain a bit and check you results. If you boost this Input Gain control too
much, and you clip the amp (or downstream signal processor), you can
reduce the Output Level. BTW - clipping sounds like a distorted signal, so
turn down the Output Level until the distorted sound goes away.
A / B Switch – If one side is set to A then the other side should be set to B. It’s
just that simple. This setting flips the wiring inside the Balanced Input/
Output jack so that the send lines become the receive lines. If both units
are set to A (or B), then you won’t get audio.
See
figure1
for a basic A to B
configuration.
Ground / Lift Switch – If you are using a shielded cable, pressing this button
disconnects the shield from ground. Use this only if you’ve picked up
some noise along the way. If no noise, then just leave in the Ground
position. If you do have some noise, lifting the ground should get rid of
it. Switch one BLX-1K to Lift to create a “drain” path. If no joy, switch the
other side to Lift.
Cat5/6 (up to 1000’)
Equipment Rack
Figure 1
Zone
Audio
Source
Amplifier
