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

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

TRIGGER

AUTO

BUS 2

TREB

BUS 1

BASS

BUS 2

BASS

BUS 1

LEVEL

BUS 2

LEVEL

++ --

BUS 1

OPTICAL

PCM AUDIO

ONLY

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

FRONT PANEL CONTROLS

REAR PANEL CONTROLS

Figu re 1. F ront Panel

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.

12.

6 7

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.

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

OWNER’S MANUAL

13970 SW 72nd Ave, Portland, OR 97203 • 503.914.4688

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

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-

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