5
To Connect to a Separate Preamp Output:
1. Do exactly as Step 1 above for connecting to a dedicated sub-woofer output.
2. Plug this phono connector into one of the separate preamp outputs
(assuming there is a left and a right output) and the XLR into the 600 Ohm
balanced Line level input of STENTOR. Note that this means STENTOR is
sensing only one channel, either right or left. Two separate sub-woofers will
be necessary for full stereo compatibility under these circumstances. This
can be advantageous in a very large room as it ensures better room coupling
from two spaced low frequency sources.
3. Connect to the mains as step 3 above.
To Connect to a 600 Ohm Balanced Line Output from a Mixing Desk:
1. Connect a three pin XLR to the open wire end of the STENTOR interconnect,
using the established pin connection convention. This means the RED wire
goes to Pin 1, YELLOW wire to Pin 2 and the BLACK wire to Pin 3. Note
that in this configuration (i.e. balanced) the signal is across the YELLOW
(phase) and the BLACK (anti-phase) with the RED to ground.
2. Plug the two XLR connectors into the mixing desk and into the balanced line
input to STENTOR.
3. Connect to the mains as step 3 above.
SETTING UP
Initially, test the effect of the controls with STENTOR sited in any convenient
position in your listening room.
Turn the two filter controls fully clockwise (maximum bandwidth) and the gain to
minimum. Play some music with known bass content, then adjust the gain control
for similar sound levels from your main system and your STENTOR. Now reduce
both filter controls to minimum. Notice that the level of the bass has almost
disappeared. This is because these very low frequencies are not being boosted by
your room Without the ABC you would never be able to hear them properly in your
room. Increase the Gain control until this deep bass is heard. Slowly increase
the coarse control one step at a time. If one position appears too much, reduce to
the lower setting then increase the Fine control a notch at a time until there is a
good match between the two systems. It may be necessary, also, to readjust the
Gain control. Do not worry if it is not immediately obvious which setting is correct.
It is sufficient at this stage that you perceive that there are differences and that one
is too extreme in each direction , ie on maximum settings there is too much bass
and at minimum settings there is too little. It will be necessary to test with different
types of music with different instruments. At this stage try and get a roughly
correct setting.
