Yorkville NX720S - Manuel (Page 3)


Configuration
The NX720S can be
used in several different
configurations. The basic
system is a single NX720S
used for each full-range
loudspeaker (multiple
NX720Ss can also be used
with individual full-range
loudspeakers). A single
NX720S can also be used
with a stereo system if both
Input A and Input B are used
(see note, below).
Note: Left and right signals can
be directly connected to a single
NX720S maintaining their stereo
separation. Plug the two audio signals (left
and right) into the Input A and Input B jacks,
the NX720S combines the line-level signals
properly but also allows you to connect the
respected left and right full-range powered
loudspeakers by connecting them directly to
the Thru jacks.
Note: When sending a mono source signal
into the NX720S, you can use either Input
A or Input B.
1. Input Level Switch
The Input Select switch is provided to choose
between line-level and speaker level. The line-
level position is for use when the NX720S is fed
a signal directly from a processor, electronic
crossover or the output of an un-powered mixer.
When using the line-level mode, the use of
balanced (Tip, Ring, Sleeve) and/or XLR cables
will reduce the unit’s sensitivity to hum and buzz.
This switch should be set to speaker level when
the NX720S is fed from the output of an amplifier
or a powered-mixer.
WARNING: Do not plug in two speaker level
sources to a single NX720S.
2. NX720S Level Control
The Level control adjusts the amount of bass
added to the sound system by the NX720S. This
Level Control adjusts for the relative sensitivity of
the companion full-range loudspeakers and the
desired system frequency response. This control
should be set by listening while operating at a
medium level and then not changed.
Note: It is not recommended
to set this control at high levels
since the limiter determines the
output level.
Note: A setting of 0 dB on the
NX720S Level control is the
correct starting point when setting
up a sound system. From there,
adjustments can be made for the
best sound. The 0 dB mark refers to
the setting that will give full power
when the line input is used and the
input signal is at a level of +4 dBV.
3. Boost Frequency Control
The Boost Frequency control allows the user
to change the character of the subwoofer
sound. This control will have less effect when
operating into limiting.
4. HF Rolloff Frequency Control
The HF Rolloff Frequency control varies the
frequency at which the NX720S rolls off the high
frequencies, which provides part of a crossover
function. This crossover function also combines
with the natural low frequency rolloff inherent of
the full-range loudspeaker (when the NX720S
is not used with a separate processor). As an
example, a Yorkville élite processor may be
used to provide the LF rolloff of the full-range
loudspeaker. Ideally the NX720S would then be
wired ahead of this processor. In this case the
NX720S HF rolloff should match the LF crossover
point of the separate processor. A separate
processor may be used ahead of the NX720S in
which case the NX720S HF rolloff should be set to
maximum. Most Yorkville powered loudspeakers
include a LF rolloff switch, which makes it
unnecessary to use an electronic crossover.
5. Input Jacks
The inputs are set up to make it easy to hook up
your NX720S to almost any audio system with a
minimum of hassles. There are two groups of input
jacks, Input A and Input B. Each set provides a
Thru connection to allow daisy-chaining. Input A
jacks includes ¼ inch jacks, a male XLR jack and
female XLR jack. Input B jacks use a single XLR
male jack and a single female jack. If these two
sets of jacks are used simultaneously the signal is
mono summed within the NX720S to generate the
signal to drive the subwoofer.
Introduction
Congratulations on your purchase of the NX720S. The NX720S is a premium-quality integrated
subwoofer and power amplifier. It’s been designed as an easy-to-setup addition to any P.A. and will
extend the bass of a typical sound system with the least amount of complication.
Note: The NX720S is primarily intended to operate with line-level signals, but will also work with
speaker level signals.