CRESZA PA1250 User manual

OWNER’S MANUAL
PA1250
CRESZA
13970 SW 72nd Ave
Portland, OR 97223
503.914.4688
PA1250 Owner’s Manual 110322
Congratulations on your purchase of the CRESZA PA1250. Please
take a few moments to read this entire manual, and be sure to retain
this document for future reference. Please read and observe all safety
instructions detailed on page 2.
NOTE: If any part of this product is damaged or missing, please call
your dealer or CRESZA directly at 1.877.715.5439 or 503.914.4688.
Please read your warranty and retain your receipt and original carton
for possible future use.
FEATURES:
SPECIFICATIONS
Stereo (8 ohm): 12 x 50W per channel, <0.2% THD+N
Stereo (4 ohm): 12 x 75W per channel, <0.2% THD+N
Bridged Mono (8 ohm): 125W, 1kHz, <0.2% THD+N
Frequency Response: 20Hz ~ 20kHz, +/-0dB
Signal to Noise Ratio: 100dB below 50W output into 8 ohms
w/20kHz lowpass filter/A-Wgt
Channel Separation: 65dB @ 1kHz, referred to 50W output
into 8 ohms
Input Sensitivity: Variable, 430mV for full output with
Input Level control at maximum
AC Power Consumption: 1000W maximum
Net Weight: 34.5lbs / 15.6kgs
Gross Weight: 39.5lbs / 17.9kgs
Digital Multi-Zone Power Amplifier
PA1250
12 Channels (6 stereo zones)
12 Rear mounted level controls
12 Independent inputs, 2 Bus inputs, 1 optical input
Bus 1 and Bus 2 master level controls
Multi-function IR remote control
Normal, signal sensing, and trigger power modes
Rear mounted treble and bass controls for bus 1 & 2
Phoenix-style speaker connectors
LED status indicator lights
Bridgeable channel outputs
Rack mountable (rack mount included)
4.0”
(102mm)
16.63” (423mm)
14.75”
(375mm)
Input: 120/230V~, 60/50Hz, 1000W
PA1250
DIGITAL
MULTI-ZONE POWER AMPLIFIER

15. Unplug the apparatus during lightning storms or when unused for long periods
of time.
16. Refer all servicing to qualified personnel. Servicing is required when the
apparatus has been damaged in any way, such as power supply cord or
plug is damaged, liquid has been spilled or objects have fallen into the
apparatus has been exposed to rain or moisture, does not operate normally,
or has been dropped.
17. WARNING: To reduce the risk of fire or electric shock, do not expose this
apparatus to rain or moisture. The apparatus shall not be exposed to
dripping or splashing and that objects filled with liquids, such as vases,
shall not be placed on apparatus.
18. WARNING: The mains plug/appliance coupler is used as disconnect device,
the disconnect device shall remain readily operable.
19. This equipment is a Class II or double insulated electrical appliance. It
is designed in such a way that it does not require a safety connection
to electrical earth.
20.
-This lightning flash with arrowhead symbol within an equilateral triangle is
intended to alert the user tothe presence of non-insulated “dangerous voltage”
within the product’s enclosure that may be of sufficient magnitude toconstitute
a risk of electric shock.
-Warning: to reduce the risk of electric shock, do not remove cover (or back) as
there are no user-serviceable parts inside. Refer servicing to qualified personnel.
-The exclamation point within an equilateral triangle is intended to alert the user
tothe presence of important operating and maintenance instructions in the
literature accompanying the appliance.
OWNER’S MANUAL
13970 SW 72nd Ave, Portland, OR 97223 • 503.914.4688
2
PA1250
CAUTION
RISK OF ELECTRICAL SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE COVER. NO
USER SERVICABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL!
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. The ventilation should not be impeded
by covering the ventilation opening s with items such as newspaper, table-
cloths, curtains etc. Install in accordance with the manufacturer’s instructions.
8. Do not install near heat source s such as radiators, heat registers, stoves,
or other apparatus (including amplifiers) that produce heat. No open flame
sources, such as lighted candles, should be placed on the apparatus.
9. Do not defeat the safety purpo se of the polari zed or grounding type plug.
A polarized plug has two blades with one wider than the other. A grounding
ty pe plug has two blades and a third grounding prong . The wide blade or
third prong is provided for your safety. If t he provided plug does not fit into
your outlet, consult an electrician for replacemen t of the obsole te outlet.
MAGNETIC FIELD: !!CAUTION!! Do not locate sensitive high-gain equipment such as preamplifiers or tape decks directly above or below the unit. Because
this amplifier has a high power density, it has a strong magnetic field, which can induce hum into unshielded devices that are located nearby. The field is
strongest just above and below the unit. If an equipment rack is used, we recommend locating the amplifier(s) in the bottom of the rack and the preamplifier
or other sensitive equipment at the top.
EXPLANATION OF
SAFETY SYMBOLS
The exclamation point within an equilateral triangle is intended to alert the user of the presence of important
operating and maintenance (servicing) instructions in the literature accompanying the appliance.
The lightning flash with the arrowhead symbol within an equilateral triangle is intended to alert the user to the
presence of uninsulated “dangerous voltage” within the products’ enclosure that may be of sufficient magnitude
to constitute a risk of electric shock to persons.
10. Protect the power cord from being walked on or pinched particularly at the
plugs, convenience receptacles, and at the point of exit from the apparatus.
11. O nly use attachmen ts/ accessorie s s pecified by t he manu facturer .
12. Use only with the cart, st and , tripod , bracke t, or
table specified by t he manu facturer , or sold with
the appara tus. W hen a cart or rack is used , use
caution when moving the cart/appara tus
combina tion to avoid injury from tip-over .
• WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE. THE APPARATUS SHALL NOT
BE EXPOSED TO DRIPPING OR SPLASHING AND THAT OBJECTS FILLED WITH LIQUIDS, SUCH AS VASES, SHALL NOT BE PLACED
ON APPARATUS.
• WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT USE THIS PLUG WITH AN EXTENSION CORD, RECEPTACLE OR OTHER OUTLET
UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE.
• WARNING: THE MAINS PLUG IS USED AS DISCONNECT DEVICE. THE DISCONNECT DEVICE SHALL REMAIN READILY AVAILABLE.
• WARNING: ONLY USE ATTACHMENTS OR ACCESSORIES SPECIFIED OR PROVIDED BY THE MANUFACTURER.
13. T he unit s hould be opera ted in a well ventilated
area . Minimum clearan ce is 2 inches from the
ventilation opening s.
14. P lease opera te the appara tus in modera te clima tes.

TRIGGER
IN OUT
_
+
BUS 1
TREB
ON
TRIGGER
AUTO
BUS 2
TREB
BUS 1
BASS
BUS 2
BASS
BUS 1
LEVEL
BUS 2
LEVEL
++ --
BUS 1
OPTICAL
PCM AUDIO
ONLY
1
1
2
2
BUS
INPUT
LEFT RIGHT
_+_
+
BR ST
L R
LINE IN LINE IN
SPEAKER SPEAKER
_
+BRIDGE
1 2 LINE IN 1 2 LINE IN
ZONE 5
VOL VOL
_+_
+
BR ST
L R
LINE IN LINE IN
SPEAKER SPEAKER
_
+BRIDGE
1 2 LINE IN 1 2 LINE IN
ZONE 6
VOL VOL
_+_
+
BR ST
L R
LINE IN LINE IN
SPEAKER SPEAKER
_
+BRIDGE
ZONE 3
VOL VOL
_+_
+
BR ST
L R
LINE IN LINE IN
SPEAKER SPEAKER
_
+BRIDGE
1 2 LINE IN 1 2 LINE IN
ZONE 4
VOL VOL
1 2 LINE IN 1 2 LINE IN
_+_
+
VOL
BR ST
L R
LINE IN LINE IN
SPEAKER SPEAKER
BUS BUS BUS BUS BUS BUS BUS BUS BUS BUS BUS BUS
1 2 LINE IN 1 2 LINE IN
_
+BRIDGE
VOL
ZONE 1
_+_
+
BR ST
L R
LINE IN LINE IN
SPEAKER SPEAKER
_
+BRIDGE
1 2 LINE IN 1 2 LINE IN
ZONE 2
VOL VOL
3-30V 12
SMALLEST MAX
20MA 1.0A
PA1250
OWNER’S MANUAL
13970 SW 72nd Ave, Portland, OR 97223 • 503.914.4688 3
1.
2.
FRONT PANEL CONTROLS
4.
5.
6.
8.
REAR PANEL CONTROLS
Figu re 1. F ront Panel
3.
9.
10.
11.
Figure 2. Rear Panel
Master Power Switch / Indicator LED
Front panel pushbutton power switch turns the amplifier on and off. When the
switch is on and the indicator LED is red, the amplifier is in standby mode. When
the LED is blue, the amplifier is fully active. The master power switch will turn off
the amplifier no matter which power mode has been selected with the rear panel
Power Mode switch.
Zone Status Indicators
Each pair ofchannels or zones has a bi-color LED to indicate its operational
status.These indicators provide quick and easy troubleshooting ofthe system. Ifthe
circuitry determines that a channel must be shut down due to excessive heat or low
impedance (a short), only the channels that are affected will be turned off causing
the zone LED to turn red. The remaining zones will continue to operate and maintain
a blue LED status. Once the condition has been corrected for the zone in question,
the status LED will return to blue.
Note: When the power LED is red and the zone status LEDS are not lit (off) indicates
the unit is in stand by mode.
Bus Line Inputs / Outputs
The PA1250 has two common or Bus inputs that receives audio signals from
standard line-level audio sources and sends them to any or all channels. The Bus
line outputs are direct feed-through to allow the Bus inputs to be fed to other
amplifiers. Be sure to use high quality RCA cables that feature low impedance,
shielding and high quality connectors.
Power Mode Switch
This switch selects the turn-on stimuli that will put the amplifier in ready mode.
“Trigger” setting relies on 3-30Vdc voltage going into the trigger input to
activate the amplifier. “Auto” setting senses a signal on the RCA line-level inputs
and automatically puts the amp in ready mode.“On” setting puts the amp
constantly in ready mode so that it can be controlled by the master power switch
on the front panel. In “Auto” mode, the amplifier will take approximately 10
minutes to return from ready to standby mode.
Trigger Input / Output
The trigger input is a handy feature when connecting the amplifier to an
automated audio system. The 3.5mm mini plug jack will accept a 3-30Vdc, 20mA
output from another device, or from a separate power supply. When the trigger
input is energized, the amp turns from standby to ON mode. When using the
PA1250 with a receiver without a trigger output, the voltage can come from a 12V
wall wart (3.5mm tip-positive connector) plugged into the receiver’s switched outlet
and the trigger input. The PA1250 can also provide an output trigger voltage (12Vdc,
1.0A) to turn on and off other devices in the audio system. When the amplifier
turns off (standby mode), the voltage will drop to zero.
Optical Input
This input uses a fiber optic cable to transmit a digital signal to the amplifier .Use
of this input is recommended for advanced users who are familiar with the
audio source’s OSD system. When using the Optical input, make sure the
source unit the cable is plugged into is in
Digital PCM (2 Channel) Mode .
Please refer to your source’s operating manual when using this input.
NOTE: Optical Input will not decode 5.1 or 7.1 signals; only Digital PCM signals.
Bus Level Controls
Each Bus has its own independent level adjustment. This allows the output level
of each Bus to be adjusted to make up for different source levels, or to group 2
different source’s volume levels. These controls are rotary encoders, with 1dB
“click” increments. The remote control can also increase or decrease these levels
independently.
7.
12.
1
2
3
4
5
6 7
8
Bus 1 and Bus 2 Bass and Treble Controls
These controls can adjust bass and treble frequencies +/- 12dB at 100Hz
and 10kHz on Bus 1 and Bus 2 independently.
Bridging Switch
By simply flipping a single switch, two channels can be combined to increase the
total power output. This is helpful when extra power is needed in certain areas.
Note: The minimum impedance for bridged channels is 8 ohms.Also, please
observe the proper speaker wiring when bridging channels. Input selection and
volume settings for bridged channels will be controlled by the left channel.“BR” is
bridged mode and “ST” is non-bridged or stereo mode.
Channel Gain Control
Each channel has its own independent level adjustment. This allows the output
level of each speaker to be perfectly matched to its area. It can also be used to
limit the maximum audio level in a certain area.
Input Selection Switch
Each channel is capable of delivering the source from one of three inputs. The
three main inputs are Bus 1, Bus 2 and LINE IN. The selection for these inputs
is done via the Input Selection switch associated with each channel. Select the
desired source input. Set the Input Selection switch to Bus 1 (will play source
connected to the Bus 1 input), Bus 2 (will play source connected to the Bus 2
input) or LINE IN (will play source connected to that channel’s LINE IN).
Individual Channel Input
All twelve channels have their own dedicated input that allows the connection of
audio sources in addition to the common Bus inputs. This is useful when using
the PA1250 with an audio matrix switcher.
Speaker Output Terminals
The PA1250 uses high quality Phoenix style connectors for the speaker
connections. Use 14-18 gauge stranded two-conductor loudspeaker wire.
Ensure that at least 2 inches of each conductor are separated. Strip away ¼
inch of insulation from each conductor. Connect the appropriate conductor
to each screw terminal, observing correct polarity. Also, please observe proper
speaker wiring when bridging channels.
910 11 12
13
13.
15
PA1250
DIGITAL
MULTI-ZONE POWER AMPLIFIER
FUSE: T12AL 250VAC FOR 120VAC 60Hz
FUSE: T6.3AL 250VAC FOR 230VAC 50Hz
POWER
RATING: ~120V60Hz/230V50Hz 1000W
3076079
PA1250
14

PA1250
OWNER’S MANUAL
13970 SW 72nd Ave, Portland, OR 97203 • 503.914.4688
4
AC Voltage Switch
The unit is set at the factory for 115V U.S. operation; simply connect the
included IEC power cord to your wall outlet. For 230V operation, move the
voltage selector switch to the 230V position. When operating at 230V the
internal fuse located in the IEC socket should also be changed. In most 230V
applications a separate power cord will be required and is not included.
IEC Power Connector
The unit comes with an IEC jack that permits removal of the AC power cord.
This allows the flexibility of changing the power cord for different countries.
The IEC socket also houses the main fuse holder. Plug the power cord
supplied with the amplifier into the amplifier and a wall outlet or appropriate
surge protector.
CAUTION: DO NOT plug the amplifier’s power cord into a switched outlet,
such as what is provided on some Surround Receivers. If you wish to have
the amplifier turn on when the Receiver is powered up, use one of the power
modes, such as Trigger or Auto.
(Page 3 Con’t)
14.
15.
REMOTE
12
3
4
1. Mute
Press this button to mute the PA1250
output.
2. Power/Standby
Press this button to bring the PA1250 out
of Standby Mode, or to put the Amplifier
in Standby Mode. If rear panel Power Mode
switch is in Auto mode, this button is non-
f unctional.
3. Bus1 Volume +/- Controls
Controls the Volume level of BUS 1the
same way the back panel BUS 1 Level
Control does.
4. Bus2 Volume +/- Controls
Controls the Volume level of BUS 2the
same way the back panel BUS 2 Level
Control does.
BUS1
BUS2
A Note On Distortion
Digital amplifiers distort differently than conventional Class A/B amplifiers.
If you hear a clicking or popping sound at high volume levels, this is an
indication the PA1250 is distorting. Pushing the amplifier harder than
the distortion level may trigger the amplifier’s protection circuitry which
will turn the output of the amplifier off and engage the red protection LED.
If this occurs, simply turn the channel level down until the distortion no
longer occurs.
Limited Warranty
CRESZA warrants its amplifier products against defects in materials and workmanship for a limited period of time. For a period of two years from date of original
purchase, we will repair or replace the product at our option, without charge for parts and labor. Customer must pay all parts and labor charges after the limited
warranty period expires. The limited warranty period for factory refurbished products expires after the ninety (90) days from date of original purchase.
This limited warranty applies only to purchases from authorized CRESZA electronics retailers. This limited warranty is extended only to the original purchaser and
is valid only to consumers in the United States.
Consumers are required to provide a copy of the original sales invoice from an authorized CRESZA dealer when making a claim against this limited warranty.
This limited warranty only covers failures due to defects in materials or workmanship that occur during normal use. It does not cover failures resulting from
accident, misuse, abuse, neglect, mishandling, misapplication, alteration, faulty installation, modification, service by anyone other than CRESZA, or damage that
is attributable to Acts of God. It does not cover cost of transportation to CRESZA or damage in transit. The customer should return his defective product, freight
prepaid and insured, to CRESZA only after receiving a Return Authorization.
This warranty will become void if the serial number identification has been wholly or partially removed, altered or erased. Repair or replacement under the terms
of this warranty does not extend the terms of this warranty. Should a product prove to be defective in workmanship or material, the consumer’s sole remedies will
be repair or replacement as provided under terms of this warranty. Under no circumstances shall CRESZA be liable for loss or damage, direct, consequen-tial or
incidental, arising out of the use of or inability to use the product. There are no express warranties other than described above.
FCC Notice
This device complies with Part 15 of the FCC rules. Operation is subject to the two following conditions: (1)This device may not cause harmful interference, and
(2)This device must accept any interference received, including interference that may cause undesired operation.
CAN ICES-3 (B)/NMB-3(B)