Quest Engineering QX-4150 Manuale utente

QX-4150 USER MANUAL | 01QUESTAUDIO.NET QUESTAUDIO.NET

QX-4150

USER MANUAL

QX-4150 USER MANUAL | 02QUESTAUDIO.NET

PRODUCT OVERVIEW

The Quest Engineering QX-4150 is a 4 channel 1RU power amplier suited for any application requiring

superior performance and reliability. Ideal for multiple zone applications providing commercial sound

installations with clean and reliable power. The QX-4150 provides 150 watts per channel of operation into

4 and 8 ohm loads and can bridge channel outputs that can be congured to deliver full channel power

to either low- or high-impedance loads. High and Low pass lters, limiters and standby are available per

channel with fast 1ms wake up time. For high end commercial, AV or domestic applications, the QX range

of ampliers provide superior class D performance with proven reliability without compromise.

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.

QX-4150 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 0.75mm2is

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-4150 USER MANUAL | 04QUESTAUDIO.NET

FRONT PANEL CONTROLS

CH1

CH2

CH3

CH4

Rotary gain control

Blue: Amplier active

Orange: Amplier is in standby mode

POrange: Amplier is in protect mode

SGreen: Signal is detected

Orange: Amplier is limiting signal or muted if in standby

mode

Red: Amplier is clipping

HPF

O: Amplier passing full range signal

On: 80Hz High Pass Filter Active (24dB/Oct)

LPF

O: Amplier passing full range signal

On: 100Hz Low Pass Filter Active (24dB/Oct)

LIMIT

O - Amplier will not limit

On - Amplier will limit to prevent clipping

A-STBY

O - Amplier will not enter power saving mode

On - Amplier will enter sleep mode after 25 minutes of

no signal

BRIDGED-MONO

O: Amplier operating as 2 individual channels

On: Amplier operating in bridged mono mode

QX-4150 USER MANUAL | 05QUESTAUDIO.NET

REAR PANEL CONNECTIONS

CH1 Input

CH2 Input

CH3 Input

CH4 Input

Phoenix/Euroblock

CH1 Output

CH2 Output

CH3 Output

CH4 Output

Phoenix/Euroblock

Mains Connection IEC

Blank Plate for Expansion Module (optional)

QX-4150 USER MANUAL | 06QUESTAUDIO.NET

BASIC OPERATION GUIDELINES

Due to the advanced power saving feature of the QX-4150, the amplier has been designed to power

from the mains with no additional switch. The amplier has a removable grille on the front panel. The

grille is held in place magnetically and can easily be removed without tools to access controls to engage

a number of modes which are described in the next section. High Pass and Low Pass lters can also be

activated to provide basic frequency dividing functions, these are most commonly used in a system with

sub-woofers.

To avoid harm to connected speakers it is important to not clip the amplier for extended period of times.

Clipping occurs when the input signal is excessive and overloads the input or output of the amplier.

To avoid clipping reduce the level of the input. The amplier has a selectable limit option which can be

engaged to help avoid clipping and it is recommended that this mode is used if the potential exists for

extended periods of overdriving.

The amplier has a protection circuit which activates when a fault condition exists. The LED will stay

illuminated until the fault is resolved. The protection circuit activates to help prevent damage to the

amplier and connected speakers. Common causes can be shorted wiring or faulty speakers. If the

Protect light illuminates disconnect the amp from power and then disconnect the speakers. Reconnect

the amp to mains and check the status of the protect LED, if the LED has not turned back on then check

the speakers and cabling for faults.

If the amplier is to drive high impedance speaker loads (70 or 100v) then Bridge mode must be enabled,

it is possible to have half the QX-4150 running high impedance loads and the other half running low

impedance loads, e.g. Ch 1&2 Bridged 70/100v and Ch 3&4 connected to separate 4/8 ohm loads or

bridged to 4/8 ohm or 70/100v.

QX-4150 USER MANUAL | 07QUESTAUDIO.NET

OPERATION MODES

Active Mode is indicated by a Blue LED, the amplier is connected to power and ready to pass signal.

The Orange LED indicates the amplier is in Standby, a power saving mode. This mode can be enabled by toggling the under

panel A-STBY switch from O to On. In this mode if no signal is detected for 25 mins the amplier will “sleep” and wake within

660ms of detection of signal.

Mute mode puts the amp into a “light sleep” and occurs when the Standby option has been selected and no signal has been

detected for 10mins, if the amplier detects signal it will wake within 1ms. When no signal has been detected for 25 mins full

sleep mode will activate.

QX-4150 USER MANUAL | 08QUESTAUDIO.NET

QX-4150

INPUT/OUTPUT WIRING

Balanced Input Wiring Unbalanced Input Wiring

Output Wiring Bridged-Mono Balanced Wiring

If the amplier is to be used in Bridge Mono mode for low impedance speakers or to drive high impedance

loads (70-100v), the under panel Bridged Mono control switch should be in the On position and input

connection wired to input 1 for channels 1&2 and channel 3 for channels 3&4. This can easily be remembered

by noting the circle around the + and – signals on input connectors 1&3.

QX-4150 USER MANUAL | 09QUESTAUDIO.NET

SPECIFICATIONS

MODEL PER CHANNEL BRIDGED-MONO MODE

LOAD 8Ohm 4Ohm 70V

(22Ohm)

100V

(33Ohm) 8Ohm 4Ohm 70V 100V

Maximum Dynamic Power

(@1KHz, 1% THD) 4x 200W 4x 275W NA NA 2x 550W 2x 550W 2x 550W 2x 550W

Maximum Continuous Power

(@1kHz, 1% THD) 4x 150W 4x 150W NA NA 2x 280W 2x 260W 2x 250W 2x 240W

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 3.8W

Muted Power Consumption 9.5W

Idle Power Consumption 16W

Standard Power Consumption

(Pink Noise@ 1/8th Rated

Power, 8Ohm)

75W

Output Connector 2-pin Phoenix (5.08mm pitch)

with a screw lock

Mains Connector Standard IEC C14

Dimensions (H x W x D) 44 x 482 x 344 mm

(1.75 x 19 x 13.5")

Weight 5.3kg (11.7 lbs)

Accessories Mains Cable, Feet, User Manual,

Phoenix Plugs

Frequency Response 20-20kHz (+/-0.3dB)

Peak Output Current 25A

Dynamic Range 104dB (A-weighted)

Noise Level -72dBu (A-weighted)

Distortion (1kHz@1W/8Ohm) 0.006%

Distortion (1kHz@50W/8Ohm) 0.006%

Crosstalk (1kHz@1W/8Ohm) -90dB

Gain 26dB/32dB

Maximum Input Level +24dBu

Input Type

Analogue Balanced 3-pin

Phoenix (5.08mm pitch) +

Optional Expansion Module

Input Sensitivity +7dBu/+4dBu

Input Impedance 10kOhm

Output Resistance 22.5mOhm/43.6mOhm

Front Controls

Volume Adjust, 80Hz HPF

Enable, 100Hz LPF Enable,

Bridged-Mono 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

* 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-4150 USER MANUAL | 10QUESTAUDIO.NET

TECHNICAL DRAWINGS

QX-4150

345mm

Height

1RU

19"

Indice

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