Quest Engineering QX-300 User manual

QX-300 USER MANUAL | 01QUESTAUDIO.NET QUESTAUDIO.NET
QX-300
USER MANUAL

QX-300 USER MANUAL | 02QUESTAUDIO.NET
PRODUCT OVERVIEW
The QX-300 Amplier is a compact, 2-channel, one third RU, high delity solution for both high (70/100V)
and low impedance (4 -16Ohm) distributed audio systems. The amplier has automatic load sensing for
low impedance and 70V line operation and can output 100V in bridged mono mode.
The QX-300 can be used as a stand-alone amplier, or with the available mounting accessories for
additional installation exibility. Three units can be mounted in 1RU or 10 units can be mounted in 3RU.
For ease of operation the front panel features recessed volume controls and status indicator lights. A
removable magnetic cover doubling as an air intake lter hides Automatic Standby, Bridged Mono, 80Hz
High Pass Filter and Limiting selection switches. The Auto Standby function will mute the amplier after 10
minutes of no audio signal presence and after 30 minutes the amp will enter a sleep mode, which allows
it to draw less than 0.5W (QX-300A) or 2.5W (QX-300D). Typical power-on from mute is <1ms and from
sleep mode is 660ms.
SAFETY PRECAUTIONS
•Please read the instructions in this section carefully before use.
•Ensure all instructions in this manual are observed as all information contained within is very important.
•It is also highly recommended that this manual is retained for future reference.
SAFETY SYMBOL & MESSAGE CONVENTIONS
The safety symbols described are used in this manual to prevent bodily injury and property damage which
could result from mishandling. Before operating this product, please read this manual rst, in full so you
that you are thoroughly aware of any risks.
Indicates a potentially hazardous situation which,
if mishandled, could result in serious personal injury or death.
WARNING

QX-300 USER MANUAL | 03QUESTAUDIO.NET
•Do not expose the unit to any moisture
whether rain, water, or other liquids. Exposure
to moisture could result in damage to internal
components or electrocution\circuit failure.
•Do not cut, kink, or otherwise damage or
modify speaker cable. Ensure a speaker cable
with a core diameter of at least 0.75mm2 is
used for specied performance.
•Do not install or place speaker cables or
this device near heaters, high trac areas
or any area where the cables or device can
be damaged.
•Avoid installing or mounting speaker
boxes, ampliers, electronics or cabling
in unstable locations.
•In the event of storms and/or lightning, ensure
all devices are disconnected from mains power
in order to prevent damage to any of the units
in the system.
• When cleaning the unit, ensure it has been
disconnected from any power source and that
only a dry cloth is used. Do not use any aerosol
or liquid-based cleaners.
•Ensure all electronics are electronically
grounded (earthed) to a safety ground
terminal in order to avoid electric shock.
Do not ground any device to a gas pipe as
this may result in re.
•Servicing of all electronics should only be
carried out by a certied Quest technician.
Please consult your original place of purchase
to nd the location of your nearest Quest
service centre.
•When installing ampliers and/or other
electronics only use the hardware specically
designed for this product.
GENERAL CAUTION

QX-300 USER MANUAL | 04QUESTAUDIO.NET
FRONT PANEL CONTROLS
UNDER PANEL CONTROLS
CH1 Rotary gain control
CH2 Rotary gain control
A
Blue: Amplier active
Orange: Amplier in standby mode
POrange: Amplier is in protect mode
SGreen: Signal is detected
L
Orange: Amplier is limiting signal
Red: Amplier is clipping
HPF
High Pass Filter O /On
O: Amplier passing full range signal
On: 80HZ High Pass Filter Active
BM
Bridge Mono O/On
O: Amplier operating as 2 individual channels
On: Amplier operating in bridged mono mode
A-STBY
Standby O/On
O - Amplier will not enter power saving mode
On - Amplier will enter sleep mode after 30 minutes of
no signal
Limit
O/On
O - Amplier will not limit
On - Amplier will limit to prevent clipping

QX-300 USER MANUAL | 05QUESTAUDIO.NET
REAR PANEL CONTROLS QX-300A
REAR PANEL CONTROLS QX-300D
Channel 1 Input Phoenix/Euroblock
Channel 2 Input Phoenix/Euroblock
Channel 1 Output Phoenix/Euroblock
Channel 2 Output Phoenix/Euroblock
Mains Connection IEC
Primary RJ-45 Dante Input
Secondary RJ-45 Dante Input
Channel 1 Output Phoenix/Euroblock
Channel 2 Output Phoenix/Euroblock
Mains Connection IEC
RST Dante Reset
ERR/CTRL/SYS/SYNC Dante System LEDs

QX-300 USER MANUAL | 06QUESTAUDIO.NET
DANTE SYSTEM LEDS
SYS red SYS System booting
SYS green SYS System ready
SYNC amber SYNC PTP currently syncing
SYNC red SYNC PTP error / no PTP sync / PTP disabled
SYNC green SYNC PTP slave, with PTP sync
SYNC green ashing SYNC PTP master
ERR amber ERR Capability is corrupted
ERR amber ERR Memory stack overow
All ashing green
SYS
Identify
SYNC
CTRL
ERR
All amber
SYS
Factory / manufacturing mode
SYNC
CTRL
ERR
All ashing amber
SYS
Upgrade mode
SYNC
CTRL
ERR
All ashing red
SYS
Failsafe - corrupt or missing application image
SYNC
CTRL
ERR

QX-300 USER MANUAL | 07QUESTAUDIO.NET
OPERATION MODES
ACTIVE
STAND-BY
MUTED

QX-300 USER MANUAL | 08QUESTAUDIO.NET
INPUT WIRING
BRIDGED-MONO MODE
STEREO MODE
Balanced Input Wiring
Unbalanced Input Wiring
Speaker Output Wiring
Speaker Output Wiring
Bridged-Mono Balanced Input

QX-300 USER MANUAL | 09QUESTAUDIO.NET
SPECIFICATIONS
Features
Wake On Music, Auto-Mute
(1ms wake-up), Limiting on
High Temperature
Amplier Protection Systems
Thermal protection,
Over-Current Protection,
DC Protection, HF Protection
Mains Input Voltage Range 85VAC - 265VAC
Standby Power Consumption 4.8W
Muted Power Consumption 16W
Idle Power Consumption 28W
Standard Power Consumption
(Pink Noise@ 1/8th Rated
Power, 8Ohm)
150W
Mains Connector Standard IEC C14
Output Connector 2-pin Phoenix (5.08mm pitch)
with a screw lock
Dimensions (H x W x D) 44 x 482 x 344 mm
(1.75 x 19 x 13.5”)
Weight 5.9kg (13 lbs)
Accessories Mains Cable, Feet, User Manual,
vPhoenix Plugs
Frequency Response 20-20kHz (+/-0.3dB)
Peak Output Current 25A
Dynamic Range 104dB (A-weighted)
Noise Level -67dBu (A-weighted)
Distortion (1kHz@1W/8Ohm) 0.006%
Distortion (1kHz@50W/8Ohm) 0.006%
Crosstalk (1kHz@1W/8Ohm) -80dB
Gain 32dB
Maximum Input Level +24dBu
Input Type Analogue Balanced 3-pin
Phoenix (5.08mm pitch)
Input Sensitivity +4dBu
Input Impedance 10kOhm
Output Resistance 43.6mOhm
Front Controls
Volume Adjust, 80Hz
HPF Enable, 100Hz LPF Enable,
Limiter Enable,
Auto-Standby Enable)
Indicators (LEDs)
Blue/Orange Active/
Standby
Orange Protection
Green Signal
Detection
Orange/Red Limiter/Clip
Cooling Fan cooled, temperature
dependent
OPERATION MODES STEREO MODE BRIDGED-MONO MODE
LOAD 8Ohm 4Ohm 8Ohm 4Ohm 70v 100V
Maximum Continuous Power
(@1khz, 1% Thd) 2 x 140W 2 x 140W 1 x 280W 1 x 260W 250W 240W
Maximum Dynamic Power
(@1khz, 1% Thd) 2 x 200W 2 x 275W 1 x 550W 1 x 550W 550W 550W
* All specications were measured at 240VAC
** Quest Engineering reserves the right to make changes in
specications, or products without prior notice.
*** The gures shown above are ‘real world’, usable specications
and are conservative as a result. Quest Engineering does not
believe in portraying misleading or exaggerated specications.

QX-300 USER MANUAL | 10QUESTAUDIO.NET
TECHNICAL DRAWINGS
327mm
125mm
1RU
ACCESSORIES
1RU
19”
315mm
125mm
1RU Brackets (Included)
1RU
19”
341mm
uRAK2 (optional)

QX-300 USER MANUAL | 11QUESTAUDIO.NET
ACCESSORIES (INCLUDED)
19”
326mm
3RU
uRAK3 (optional)
75
106.500
106.500
75
100
82.500
142.500
100
WP-QX-300 (optional)

QX-300 USER MANUAL | 12QUESTAUDIO.NET
REGISTER YOUR PRODUCT
Thank you for choosing Quest. Please take
the time to complete your product registration.
Registering your Quest Engineering product will:
• Conrm your warranty
• Register your product
• Protect your new product
REGISTER ONLINE
questaudio.net/warranty-reg/
For spare parts and service,
contact your local authorised Quest Dealer.