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Yorkville
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NX55P
Owners manual
18 pgs1.07 Mb0
Service Manual
14 pgs2.26 Mb0
Service Manual
8 pgs1.85 Mb0
User Manual
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Service manual
21 pgs2.82 Mb0
Parts list
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User's Manual
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Table of contents
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Yorkville NX-55-P Owners manual

P
55
550 WATT POWERED LOUDSPEAKER ENCLOSURE
Y ork vi l l e
OWNER'S MANUAL
MANUEL de L'UTILISATEUR
MODEL TYPE: YS1002
NX55P Active Full Range Loudspeaker
Using the popular nx20 as a base, adding 550 Watts of bi-amped power and topping-it-off with aad­vanced signal processing, the NX55P is destined to set the new standard for active loudspeakers. The woofer amplifier, or low frequency amplifier, amp delivers over 450 Watts to the 12 inch neodymium woofer. To reduce the overall weight of the amplifier section, the woofer amplifier uses Class D switching technology. A 100 Watt, two-tier linear technology, Class H amplifier drives the 1 inch dia­phragm horn driver. This allows the horn to produce clean transients while keeping up with the high output of the woofer. Two-tier amplifier technology isn’t typically seen in a product like this, however we found the advantages (lower weight, more efficiency, higher headroom and lower operating temperature) made it a perfect choice for powering the top end.
This combination of Class D and Class H amplifier technologies helps keep distortion to a minimum while reducing the need for massive heat dis­sipation. In fact, to a level low enough to eliminate the need for heavy heatsinks. The advantage of this unique combina­tion of two-tier and Class D amplification has reduced extrane­ous heat to the point that NX55P’s can easily be used in any orientation (close to walls, floors and in close arrays with multiple cabinets). Competitive active loudspeak­ers, with large finned heatsinks, need to be operated vertically and with plenty of clear­ance (to ensure proper heat dissipation and ventilation). Since you have more versatility in regards to the orientation of the enclosure, the NX55P becomes ideal for flying in large clusters and in point-source concert sound systems. Yorkville’s designers took extra care making sure that in tight clusters overheating would not be an issue.
Taking advantage of the design process, an opportunity was taken to tweak the electronics for maximum overall speaker performance and protection. Solutions were borrowed from our high-end TX-Series PA systems. The limiters used, at the input and crossover stages, are a complex combination of gain reduction and sweep­ing filters. If the NX55P is pushed to its maximum input/output levels, advanced filtering begins rolling off unnecessary subsonic frequencies. The processing also protects individual components ensuring failure free operation (even after long term operation at close to maximum output levels). The filter has a remarkable response time, less then 70ms, allowing the system to constantly be re-tuning itself. This makes sure the output is as clean, as loud and as clear as possible at any
given moment. This is achieved
without negatively affecting
the overall sonic quality of
the cabinet. This ensures
that the essential part of
the mix, like the vocals or solo instruments, come out clean and
clear when the cabinet
is being operated at the
extremes of power and
woofer excursion. Ex-
tremely fast and accurate
limiting is in place to protect
the speaker components.
As a bonus, the NX55P
has a built in mixer! This al-
lows the loudspeaker to be
used directly with a micro-
phone and/or line source. The
loop output allows additional active cabinets to be driven from one source (up to a maximum of 50 NX55Ps). If desired, you can combine a pair of the NX55P’s using the mixer inputs on each cabinet and coupling the loop outputs. In this example you would have an ideal presentation system. Two microphone inputs, two line inputs (opti­mized for CD, Cassette or laptop computer audio source), complete within two speaker cabinets. As mentioned, our active cabinets can be linked together, the limitation is that only three ‘mixers’ can be active at any one time. This allows three Mic sources and six line sources available in an array of three or more cabinets). The microphone inputs have equalization and high pass filtering designed appropriately for vocal applications. The trim control allows looped cabinets to be individ­ually adjusted in level. This is invaluable in ap­plications where large numbers of cabinets are used such as in clusters or in trade show applications (or when NX55P’s are used as repeater cabinets or for side fill). The 100 Hz high pass filters allow the NX55P to be used more efficiently with any active subwoofer.
1

Features

• Ultra-clear reproduction throughout
the whole bandwidth
• High efficiency, high tech, 550 Watt Bi-
amped power module
• Superior TX-style processing and
component protection
• True 1 inch diaphragm horn driver
• Low distortion/high power-handling
12-inch woofer
• – ∞ dB / + 6 dB Level control (for individual
cabinet level adjustment)
• XLR and TRS inputs / outputs for easy
connection and looping
• Multi-input source mixer for direct inputs
• Direct microphone input with level control
• Two way overall EQ controls
• Integrated flying hardware (3/8 inch
threaded holes)
• Tough, full-length metal grille
• Recessed Mixer panel

1. Operation

The NX55P is a bi-amped powered full-range loudspeaker with a built-in two channel mixer. Multiple NX55P cabinets may be connected
through the Link option. If you’re using the
NX55P with an external mixer, the internal mixer can be disabled. The built-in mixer has a micro­phone input and two (combined) ¼ inch inputs for line sources such as CD players. Advanced signal processing is used to give maximum performance at all levels. There’s a switch to provide a low frequency rolloff if you’re going to use the NX55P with a subwoofer.

2. Mic Input

Any regular microphone can be inserted into
the Mic input. Phantom power is built–in for
condenser microphones.

3. Line/CD inputs

The Line/CD inputs allow line-level sources such
as CD players, cassette decks or any other sources such as mixers to be connected. If more than one input is used these inputs blend the signals (e.g. stereo sources) into mono. The inputs are balanced to help reject hum (when used with balanced cables) Unbalanced 1/4-inch plugs can be used. When connect­ing to unbalanced sources using balanced
T.R.S. cables does help reduce unwanted noise
and/or hum. These inputs can be used for
lower-level Line inputs, which need a bit more gain (as opposed to using the Link jacks, which
have no control). These inputs allow you to have a greater range of level adjustment than using just the NX55P Level control (e.g. if an in­dividual cabinet, in the chain needs to operate at lower level than the rest).
4. Link
These parallel jacks allow multiple NX55P cabi-
nets to be connected together. The Link Jacks
are the correct input to use when driving the
NX55P from an external mixer. The Link Jacks op­erate at line level (+4 dBv) to achieve full power. The NX55P Level control allows operation at levels from –2 dBv to +10 dBv for full power. When
operating from signals that are not as strong, use
the Line inputs of the rst cabinet in the chain. The Link jacks are high quality balanced inputs
with very good common mode (hum) rejection. To ensure maximum hum rejection, the proper balanced cables must be used. When con­necting to unbalanced sources using balanced
T.R.S. cables does help reduce unwanted noise and/or hum. Jacks marked LINK OUTPUT are con­nected in parallel with the LINK INPUTS and are
provided for convenience to connect down-
stream cabinets. Link inputs may also be used as
outputs and link outputs may be used as inputs.

5. Level Control

This control allows the audio level of the cabinets, linked in a chain, to be individually adjusted. This control does not adjust the level
of the Link jacks. The Level control should be
set at '0' (center) for most applications.

6. LF Rolloff

For operation with a subwoofer, the LF Rolloff
switch shuts off the low frequency boost and filters out signals below 100 Hz. It’s not neces­sary to use this switch for speech applications because the Mic input already has a high pass filter. This switch only affects the signals to the internal amplifier and does not affect signals going out from the internal mixer, or to signals
passing through the Link connections.

7. Mixer On/Off

The Mixer On/Off switch turns the NX55P’s
internal mixer on the rear panel on and off. The NX55P’s mixer should be used when a microphone or CD player is directly connected
to one of the NX55Ps Line/CD or Mic inputs. It should be switched off* if the NX55P’s Link Input
is connected to a separate mixer’s output.
*Note: the NX55P has been designed to enable the user to interconnect multiple NX55Ps (up to 12 or even more) via the Link Inputs and Outputs. When linking NX55P's, a maximum of 3 of the NX55P’s internal mixers can be used (activated) allowing up to 3 microphones and 3 line sources to be mixed without an external mixer. This is useful for smaller music engagements, meetings, seminars, etc.

8. Mic Control

This control adjusts the volume level the Mic input. The microphone signal output to other cabinets through the link connections will be affected as well.
2
M IX E R
CLIP
LIMIT
MIC
100
BASS
1212
dB
TREBLE
12
12
dB
LINE/CD
100
dB
NX55P
LEVEL
6
00
LF ROLLOFF
0
100Hz60Hz
MIXER
OFF
ON
PWR
MIC
INPUTOUTPUT
A-Z822 / 1v0 PR1
LINE / CD
INPUTOUTPUT
BAL
LINK

9. Line/CD Control

This control adjusts the volume level of devices
plugged into the Line/CD input. The signal out
to other cabinets, from this device, through the link connections will be affected as well. A line-level signal and microphones can be con­nected simulataneously.

10. Treble and Bass Controls

These controls affect the signals from devic-
es plugged into the Line/CD and Mic inputs.
The signal out, to other cabinets, through
the Link will also be affected. These controls
do not affect signals coming into the cabi-
net from the Link connections.

11. Green PWR LED

Illumination indicates that AC power is on and the fuse is functioning.

12. Yellow Limit LED

This indicates that the cabinet is operating at full power and the limiter(s) are actively reduc­ing the signal level. It’s all right to operate in limiting as long as the clip light is not constantly on. The Limit light does not indicate low fre­quency processing action. There are separate
limiters for the woofer and horn. This LED will
indicate operation of either limiter.

13. Red Clip LED

The illumination of this LED indicates that the
signal level is excessive and may cause distor-
tion. Reduce mixer levels or turn down the Level
control (on NX55P) to reduce clipping.

14. Power Switch

This turns the power On and Off to the cabi­net. Note; a cabinet that is turned off, but is one of the cabinets in a chain might cause hum (or buzz) in the other cabinets.

15. Fuse

The mains fuse should never blow even in extreme operating conditions. A blown fuse will generally mean that excessive mains voltage has been applied or there’s a serious fault with the unit. Self re-setting thermal switches are built into the power transformer as well as on the internal heat sink. These will not trip even under the most extreme operating condi­tions and are provided only for safety reasons. Thermal margins may be compromised when operating facing straight up, straight down or while operating in direct sunlight!
A note about unbalanced operation: When connecting an unbalanced source (such as a mixer with RCA outputs) to balanced inputs such as an NX55P, the best hum rejection can be achieved by running a balanced connection right to the unbalanced plug. The return connection should be connected to ground at the unbalanced plug. The NX55P does not connect the AC power ground directly to the input signal ground. This will eliminate most ground problems.
3

Specifications

System Type
2-Way
Active or Passive
Active
Program Power (Watts)
550
Biampable
Self Powered
Biamp Operation Only
Yes
Max SPL (dB)
124
Frequency Response (Hz +/- 3db)
45 - 18k
Crossover Frequency (Hz)
2300
Driver Configuration
12 inch / 1 inch
HF Driver(s)
1 inch Throat, Ceramic Magnet, 1 inch Mylar voicecoil
HF Program Power (Watts)
100
HF Dispersion (°H x °V)
80 x 50
LF Driver(s)
12 inch Neodymium Magnet 3 inch voicecoil
LF Program Power(Watts)
450
Total Power (Watts)
550
HF Amplifier Type
Two Tier Class H
LF Amplifier Type
Class D
Power Cable
Yes
Power Switch
Yes
Inputs
7
Inputs - 1/4" Jacks
2 (line input) 2 (link in/out)
Inputs - XLR
1 (mic) 2 (line in/out)
Input Sensitivity (Vrms Sine)
+4dBv / 1.23V Mixer on/off switch Mic Gain Line/CD Gain Treble/Bass Tweak
Level Controls
+/- 6dB Main Volume
EQ Controls
100Hz HP Filter (LF Rolloff)
Limiter
Yes
LED Indicators
Power/Clip/Limit
Feet
Yes
Flying Hardware
2 (Top), 2 (Bottom), 1 (Pullback)
Optional Flying Hardware
NX Flyware
Bar Handles
1 (Side)
Pole Mount Adapter (1 3/8"-3.5cm)
Yes
Enclosure Materials
Injection molded Polypropylene
Grille
Perforated Metal
Dimensions (DWH xbackW, inches)
12.25 x 16 x 26.5 x 9
Dimensions (DWH xbackW, cm)
31.12 x 40.6 x 67.3 x 22.9
Weight (lbs/kg)
41 / 18.6
Mixer Controls
P
55
550 WATT POWERED LOUDSPEAKER ENCLOSURE
4
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