SOUND REINFORCEMENT
CONTROLLED RADIATION
ACOUSTIC RESEARCH
CONTROLLED RADIATION
User’s Manual
UPTURNED T
series
SOUND REINFORCEMENT
ACOUSTIC RESEARCH
9
4.7 Live applications: considerations
Upturned T
active stack systems
are perfect for acoustic live performances
where they provide an excellent performance/dimensions ratio.
The timbre and the dynamics of active stack systems are highly satisfactory
for acoustic guitar amplification, producing a vivid, authentic sound
and excellent feedback to the performer. The same applies to acoustic
bass or contrabass (which will not require any bulky dedicated amp).
Amplification of the human voice is strong and clear and is particularly
resistant to the
Larsen
effect
.
Active stack systems are also recommended for live sound reinforcement
in small indoor venues. In this case, as usual, the sound of guitars and
electric bass guitars will come from the single amplifiers while the active
stack system will be used for the amplification of voices (and -
why not?
- for bass drum reinforcement). This configuration can once again be
placed behind the performer and thus act as a monitor as well.
4.8 Differences between the UT 1_1 and 2_1
Active Stack systems
As explained in paragraph 3.2, the
Active Stack 2_1
system has a longer
range as compared to “half-length systems” (
Active Stack 1_1
).
This is due to the greater extension of the array (and therefore greater in-
depth penetration of the array effect at lower frequencies) as well as to the
higher position of the topmost loudspeakers.
The
2_1
system has more loudspeakers angled at 20 ° and 30 ° and thus the
horizontal dispersion is greater in the near-field. Furthermore, the sound
beam generated by this system in the near field is wider vertically and
allows a greater homogeneity of sound at different heights (e.g. between
sitting and standing audience).
For this reason, we recommend the use of
Active Stack2_1
systems
when the audience sits near the sound systems, when the stalls are
sloping, when the audience is partly seated and partly standing as
well as when there is a crowded standing audience and a need for a
deep penetration of the high frequencies.
The
2_1
system additionally reaches a higher peak pressure (greater
“dynamic”) on the medium-low frequencies (150 Hz - 300 Hz) due to the
coupling of twice the number of transducers (+ 4-5 dB), which is always
useful but especially in cases of music with a strong element of percussion.
The
1_1
system, on the other hand, is best for an audience that is not sitting
very close to the systems, for standing audiences that are not crowded over
very large areas or do not need high peaks of the medium-low frequencies.
1_1
systems are suitable for creating a small portable dance floor, for example,
since the required punch for dance music is supplied by the subwoofer and
the PSUT8TE column element is more than adequate for the rest of the signal
spectrum.
For a larger system, we recommend doubling this installation, rather, i.e. using
the
Active Stack 1_1_stereo
system.
For a small stage with monitors and P.A.s for “acoustic” music and where the
size of the audience stall is not excessive, a
1_1
system is just as performing (all
the technical details are explained in the table on the right).
