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REL Acoustics ST III Range Manual

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REL Acoustics ‘ST III’ User Manual
20
Note: As the Q-series crossover adjustment uses a single variable control, use the closest
correlating position to any of the crossover settings noted above for ST series models.
Ultimately, as with the click stops of the ST range, simply bring gain and then crossover up
until excess output is achieved, then back down a soft-click or two.
Hint: There is a tendency among audiophiles to set the crossover point too high and
the gain too low when first learning how to integrate a REL with the system, the fear
being one of overwhelming the main speakers with bass. But in doing so, the
resulting set-up will be lacking in bass depth and dynamics. The proper crossover
point and gain setting will increase overall dynamics, allow for extended bass
frequencies, and improve soundstage properties. Note, gain must be adjusted in
conjunction with crossover changes. In general, when selecting a lower crossover
point, more gain may need to be applied.
Theatre and Film Applications: For Dolby Digital AC-3 or other 5.1 theatre systems, once
the standard set-up for two-channel outlined above is complete, the LFE output from the
processor or receiver should be connected to the low-level input and appropriate gain
adjustments made. It may be necessary to take the crossover out of the low-level input using
the “mode” switch if extra upper bass output is called for. Keep phase consistent with what
was selected during high-level set-up by simply choosing the corresponding setting (1 = 2, 3 =
4). For this configuration, you must set the processor to the “large” or “full range” setting for
the left and right speakers in order for the REL to receive the bass signal via the high-level
cable. In this configuration, the REL provides support for both the left and right speakers for
two-channel listening, and support for the LFE when movies are playing. Most processors will
allow you to defeat the subwoofer output when listening in the two-channel mode. The effect
of this set-up is one of greatly increased dynamics in the mid-bass range; no bass bloat; and
a greater degree of space and timing from the Foley effects. For an even greater sense of
space and impact, a second woofer connected in parallel to the centre channel will prove to
be a dramatic improvement as well. And if that is not enough fun, a rear sub, both to support
the rear channel speakers as well as to evenly distribute LFE through the room, truly
completes the full-range sonic picture for state-of-the-art film reproduction. A comprehensive
set-up paper for home theatre will be coming very soon.
Other Tips: Generally speaking, do not use the supplied spikes. RELs work on the principle of
the driver in a high-pressure zone relative to the floor. Spiking the REL will decouple the
woofer from the floor, which will lean out the bass response. If the floor is an older, very
“springy” floor, spikes can be useful in reducing the influence of the REL on the floor. But
better yet, a heavy stone slab placed under the REL will work better. Even if you intend to use
the spikes, do NOT insert them until completion of the set-up process. After which, subtle
adjustments to crossover and gain may be necessary
… 20 …


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