Deqx A250x3 Series User manual

High Definition Power Amplifiers
A250x3
A250x2
A500x1
User Manual
Revision 1, May 2018.

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IMPORTANT INFORMATION
DISCLAIMER AND LIMITATION OF LIABILITY
DEQX Pty. Ltd. (‘DEQX’) assumes no responsibility for loss or damage resulting from the use of
any of its products.
Refer to the license supplied with the DEQX®Calibration software (pages 3 and 4).
Specifications are subject to change without notice.
Contact DEQX Support at http://www.deqx.com/support/ for installation and operational
support. We highly recommend using the DEQXpert™on-line installation and/or training
service.
The exclamation point within a triangle is intended to alert the user to the
presence of important operating and maintenance instructions in the
literature accompanying the product.
The lightning with arrowhead symbol within a triangle is intended to alert
the user to the presence of un-insulated “dangerous voltage” within the
products’ enclosure that may be of sufficient magnitude to constitute a risk
of electrical shock to person.
WARNING
To prevent fire or shock hazard, do not expose the unit to rain or moisture. To avoid electrical
shock, do not open the unit. No user-serviceable parts are inside. Refer any servicing to qualified
personnel.
Caution: Damage may result to your speaker drivers and other equipment if your audio system is
connected incorrectly or if the unit is used incorrectly. Read this user manual in full before
configuring your hardware and refer to your speaker manufacturer's specifications to ensure
correct connection. If you are in doubt as to as the connection of your audio equipment, seek
assistance from a professional audio installer or contact DEQX at
http://www.deqx.com/support/.
ALWAYS TURN THE DEQX UNIT AND ANY ASSOCIATED AUDIO EQUIPMENT
OFF BEFORE CONNECTING OR DISCONNECTING AUDIO CABLES.
ANY AUDIO EQUIPMENT REQUIRING GROUNDING MUST BE GROUNDED TO
THE SAME POINT (CIRCUIT) AS THE DEQX UNIT.
FAILURE TO OBSERVE THESE WARNINGS CAN RESULT IN DAMAGE TO THE
DEQX UNIT AND OTHER AUDIO EQUIPMENT AND MAY NOT BE COVERED BY
WARRANTY.

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IMPORTANT SAFETY INSTRUCTIONS
Read these instructions entirely before installing or operating this product. Keep these
instructions. Heed all warnings. Follow all instructions.
Do not use this product near water. Clean only with a dry cloth.
Do not block any ventilation openings. Install in accordance with the manufacturer’s
instructions.
Do not install near any heat source such as radiators, heat registers, stoves, or other apparatus
(including amplifiers) that produce heat.
Do not defeat the safety purpose of the grounding-type safety plug. A grounding-type plug has
two blades and a third grounding prong or blade. The third prong or blade is provided for your
safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of
the obsolete outlet.
Protect the power cord from being walked on or pinched, particularly at the plug and the point
where the cord exits from this product.
Do not use this product with a damaged cord or plug.
Only use attachments and accessories specified by the manufacturer.
Unplug this product during lightning storms or when unused for long periods of time.
Refer all servicing to qualified service personnel. Servicing is required when the product has been
damaged in any way, such as when the power cord or plug are damaged, liquid has been spilled
or objects have fallen into the product, the product has been exposed to rain or moisture, does
not operate normally, or has been dropped.
CLEANING AND MAINTENANCE
Always unplug the product from the electrical outlet before cleaning. Do not use abrasive
cleaners. Simply wipe the exterior with a clean soft cloth. A small amount of non-abrasive
cleaner may be used on the cloth to remove any excessive dirt or fingerprints.
LICENSE
This is a legal agreement (‘Agreement’) between you (either an individual or an entity), the end
user, and DEQX Pty Limited, Sydney, Australia. By installing, copying, or otherwise using the
Product (as defined below), you agree to be bound by the terms of this Agreement. If you do not
agree to the terms of this Agreement, do not install, copy, or use the product, and promptly
return the disks and any accompanying items (including written materials and binders or other
containers, if any) to DEQX Pty Limited.
DEQX LICENSE AGREEMENT for one Copy of DEQX-Cal™Acoustic Calibration Software and
Firmware © 2004–2016 DEQX Pty Limited. All rights reserved.
GRANT OF LICENSE
DEQX grants the ‘Recipient’ a limited, nonexclusive, non-transferrable, royalty-included with
hardware purchase, license to make and use DEQX-Cal™ software (‘Product’) to be installed on
approved Windows platforms for Recipient's use ONLY with DEQX®speaker and room

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calibration products including but not limited to PDC-2.6, PDC-2.6P, HDP-3, HDP-4, HDP-5,
DEQX MATE, PreMATE, PreMATE+, HDP-Express, and HDP-Express II.
All other rights are reserved to DEQX. Recipient shall not rent, lease, sell, sublicense, assign, or
otherwise transfer the Product, any accompanying printed materials (‘Documentation’), or a
digital content created with the Product (‘Filter coefficients’). Recipient may not reverse
engineer or decompile the Product. DEQX and its suppliers shall retain title and all ownership
rights to the product, and this Agreement shall not be construed in any manner as transferring
any rights of ownership or license to the Product or to the features or information therein,
except as specifically stated herein.
TERM OF AGREEMENT
The term of this Agreement shall commence on the date you accept this Agreement and shall
continue unless terminated by DEQX in writing at any time, with or without cause. In the event
that DEQX terminates this agreement, Recipient shall promptly return to DEQX, or certify
destruction of, all full or partial copies of such product and related materials provided by DEQX.
PRODUCT MAINTENANCE
DEQX is not obligated to provide maintenance or updates to Recipient for Product licensed
under this Agreement.
DISCLAIMER OF WARRANTY
DEQX-Cal™software (‘Product’) is deemed accepted by Recipient upon first use. The PRODUCT
IS PROVIDED ‘AS IS’ WITHOUT WARRANTY OF ANY KIND. TO THE MAXIMUM EXTENT
PERMITTED BY APPLICABLE LAW, DEQX FURTHER DISCLAIMS ALL WARRANTIES,
INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. THE ENTIRE RISK
ARISING OUT OF THE USE OR PERFORMANCE OF THE PRODUCT AND DOCUMENTATION
REMAINS WITH RECIPIENT.
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL DEQX
OR ITS SUPPLIERS BE LIABLE FOR ANY CONSEQUENTIAL, INCIDENTAL, DIRECT, INDIRECT,
SPECIAL, PUNITIVE, OR OTHER DAMAGES WHATSOEVER (INCLUDING, WITHOUT
LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS, BUSINESS INTERRUPTION, LOSS
OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS) ARISING OUT OF THE USE OF
OR INABILITY TO USE THE PRODUCT OR DOCUMENTATION, EVEN IF DEQX HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
GOVERNING LAW;ATTORNEY’S FEES
The laws of the State of New South Wales, Australia shall govern this Agreement and Recipient
further consents to jurisdiction by the state and Australian federal courts sitting in the State of
New South Wales. If either DEQX or Recipient employs attorneys to enforce any rights arising
out of or relating to this Agreement, the prevailing party shall be entitled to recover reasonable
attorneys' fees.
COPYRIGHT
Copyright © 2004–2016 DEQX Pty Ltd, Sydney, NSW, Australia (‘DEQX’). DEQX®and DEQX-
Cal™ are trademarks of DEQX Pty Ltd. All other product or brand names referenced in this
manual may be trademarks or registered trademarks of their respective owners.

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1PRODUCT OVERVIEW
Congratulations on purchasing a DEQX®High Definition Power Amplifier. Based on N-
core D-class technology, these fully balanced amplifiers provide state-of-the-art D-class
musicality due to unusually low harmonic, intermodulation and Impulse-response
distortion.
The DEQX power amplifiers are designed to perfectly complement the DEQX range of
high definition audio processors. They are available in three versions: A250x3 (250W x 2
+ 100W) for tri-amped configurations; A250x2 (250W x 2) for stereo, bi-amped and
subwoofer configurations; A500x1 (500W x 1) for high-power speaker applications.
An example system using a DEQX HD-Active™ tri-amp configuration is illustrated
below.

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2FRONT PANEL
The DEQX logo illuminates when the amplifier is turned on and active. Amplifiers can
be purchased with black or silver faceplate.

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3REAR PANEL
Make all connections with the power cord removed from the unit. Shown here is the
A250x3 rear panel:
Trigger mode
When switched to “Power ON,” the main power switch turns the amplifier
on and off.
When switched to “Trigger”, the main power switch places the amplifier
into standby mode only. The amplifier is active when the Trigger IN input
becomes active. This is the normal operating mode with a DEQX HDP-5.
Trigger IN
Connect this input to one of the two trigger outputs on a DEQX HDP-5 or
PreMATE Plus. The Trigger mode switch must be set to “Trigger”.

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Analog inputs
Connect each input to the corresponding output of the DEQX HDP-5, HDP-
4, PreMATE, or PreMATE Plus.
Speaker outputs
Connect the speakers or speaker driver to the 5-way binding posts. Ensure
that each output is connected to the correct driver.
AC mains power
The amplifiers are equipped with a universal power supply, so no mains
voltage selection is required on the part of the user. Connect a standard IEC
power cable and turn on the main power switch.
A250x2 rear panel
A500x1 rear panel

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4TYPICAL CONNECTION DIAGRAMS

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5SPECIFICATIONS
5.1 A250X2AND A250X3
Parameter
Bass/midrange (A250x3)
CH-1/CH-2 (A250x2)
Tweeter
(A250x3 only)
Input impedance
47 kΩ
47 kΩ
Voltage gain
25.5 dB
25.5 dB
Input voltage for full power (4 ohms)
1.7 V RMS
1.05 VRMS
Input voltage for full power (8 ohms)
2.1 V RMS
1.5 V RMS
Distortion
<10Hz-20kHz AES17 Pout=1W
< 0.0015%
< 0.0018%
Damping factor
f < 20 kHz, Load = 4Ω
> 1000
> 1000
Frequency response, +0/-3 dB
10 Hz to 50 kHz
10 Hz to 50 kHz1
Signal to noise ratio
<10Hz-20kHz AES17
121 dB
106 dB
Minimum speaker impedance
2 Ω
2 Ω
Max output power (4 ohms)
1KHz, THD=1%, both channels driven
250 WRMS
100 WRMS
Max output power (8 ohms)
1KHz, THD=1%, both channels driven
200 WRMS
100 WRMS
Continuous/average output power
Thermally limited, 25°C ambient
50 WRMS
20 WRMS
Maximum power consumption
650 W
1
Recommended operation is from 500 Hz upwards.

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5.2 A500X1
Parameter
Speaker
Input impedance
23.5 kΩ
Voltage gain
31.5 dB
Input voltage for full power (4 ohms)
1.06 V RMS
Input voltage for full power (8 ohms)
1.7 V RMS
Distortion
<10Hz-20kHz AES17 Pout=1W
< 0.0018%
Damping factor
f < 20 kHz, Load = 8Ω
> 1000
Frequency response, +0/-3 dB
10 Hz to 50 kHz
Signal to noise ratio
<10Hz-20kHz AES17
106 dB
Minimum speaker impedance
4 Ω2
Max output power (4 ohms)
1KHz, THD=1%
400 WRMS
Max output power (8 ohms)
1KHz, THD=1%
500 WRMS
Continuous/average output power
Thermally limited, 25°C ambient
100 WRMS
Maximum power consumption
650 W
2
4 ohms is the minimum allowed load . The recommended load is 8 ohms.
This manual suits for next models
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