HPA QA4150 User manual

Owner’s Manual
QA4150
QA4300
POWER AMPLIFIER
QUAD-CHANNEL
POWER
ON
OFF
QA4300
HPA
CHANNEL 1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
17
19
22
29
54
PROTECTCLIPSIGNAL
CHANNEL 2
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
17
19
22
29
54
PROTECTCLIPSIGNAL
CHANNEL 3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
17
19
22
29
54
PROTECTCLIPSIGNAL
CHANNEL 4
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
17
19
22
29
54
PROTECTCLIPSIGNAL
POWER AMPLIFIER
QUAD-CHANNEL
POWER
ON
OFF
QA4150
HPA
CHANNEL 1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
17
19
22
29
54
PROTECTCLIPSIGNAL
CHANNEL 2
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
17
19
22
29
54
PROTECTCLIPSIGNAL
CHANNEL 3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
17
19
22
29
54
PROTECTCLIPSIGNAL
CHANNEL 4
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
17
19
22
29
54
PROTECTCLIPSIGNAL

WARNING

1
QA4150 / QA4300
Introduction ………………………………………………………… 2
Features ……………………………………………………………… 3
Front Panel Controls ………………………………………………… 4
Rear Panel Controls ………………………………………………… 5
Protection …………………………………………………………… 7
Setup ………………………………………………………………… 8
Connections ………………………………………………………… 9
Wiring ………………………………………………………………… 11
Specifications ……………………………………………………… 12
Table of Contents
Table of Contents

2
QA4150 / QA4300
Introduction
Welcome.
Congratulation and thank you for the purchasing QA Series, a state-of-the-art heavy
duty professional amplifier.
These amplifier are designed to provide a big impact in sound reproduction and to
produce the best and highest quality audio at an affordable price. We wish you great
enjoyment and satisfaction when using your amplifier, whether you are an installation,
or reinforcement engineer.
Unpacking and Installation
Although it is neither complicated to install nor difficult to operate your amplifier, a few
minutes of your time is required to read this manual for a properly wired installation
and becoming familiar with its features and how to use them. Please take a great care
in unpacking your set and do not discard the carton and other packing materials. They
may be needed when moving your set and are required if it ever becomes necessary to
return your set for service. Never place the unit near radiator, in front of heating vents,
to direct sun light, in excessive humid or dusty location to avoid damages and to guar-
anty a long reliable use. Connect your unit with the system components according to
the description on the following pages.
POWER AMPLIFIER
QUAD-CHANNEL
POWER
ON
OFF
QA4300
HPA
CHANNEL 1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
17
19
22
29
54
PROTECTCLIPSIGNAL
CHANNEL 2
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
17
19
22
29
54
PROTECTCLIPSIGNAL
CHANNEL 3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
17
19
22
29
54
PROTECTCLIPSIGNAL
CHANNEL 4
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
17
19
22
29
54
PROTECTCLIPSIGNAL
QA4150 / QA4300
QUAD-CHANNEL POWER AMPLIFIER
Introduction

3
QA4150 / QA4300
Features
HPA QA-Series amplifier delivers the following power ratings.
QA4150 4 x 100 Watts at 8 ohm, 4 x 150 Watts at 4 ohm and 2 x 300 Watts at 8 ohm bridge
QA4300 4 x 200 Watts at 8 ohm, 4 x 300 Watts at 4 ohm and 2 x 600 Watts at 8 ohm bridge
4-channel, 2-parallel or 2-bridged mono operating modes for flexible application 300
Watts for QA4150, 600 Watts for QA4300.
Independent limiters for each channel reduce distortion.
Independent input level controls for each channel allow precision adjustments.
Precise signal and clip LED indicators to monitor performance, allow you to correct
for overloading (clipping) condition.
Twin-tunnel and four temperature-sensitivity forced-air cooling system to maintain a
low temperature working condition.
Balanced XLR or balanced 1/4-inch TRS Combination input connector for each
channel.
5-way output binding posts or Speaker connectors enable secure operation.
High-current toroidal transformer for absolute reliability.
Independent DC and thermal overload protection on each channel automatically pro-
tects amplifier and speaker.
The QA series can be mounted in any standard 19” rack.
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•
•
•
•
•
•
•
•
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Features

4
QA4150 / QA4300
Front Panel Controls
1. Rack Mounting Ears
Two front panel mounting holes are pro-
vided on each mounting ear.
2. Fan Vent
QA series amplifiers are cooled by two
rear-mounted fans. Cool air is flowed through
the front fan filters, reducing the temperature
of the inside components while forcing the
heat out the rear vents. Never block these
vents and keep them clean at all time.
3. AC Power Switch
This switch controls the units main power.
4. Signal Indicators
These green and yellow LED will illumi-
nate to indicate that a signal is present at the
amplifier input, and that the signal is being
amplified.
5. Clip Indicators
These red LED will illuminate at the clip-
ping threshold. If it lights frequently, you
maybe overloading the QA Series and a dis-
torted signal is probably being output. Under
heavy clipping activity lower the channel gain
controls to reduce the risk of damage to your
speakers and amplifier.
6. Power Indicators
These blue LED indicate that AC power is
connected and the amplifier is turned on.
POWER AMPLIFIER
QUAD-CHANNEL
POWER
ON
OFF
QA4300
HPA
CHANNEL 1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
17
19
22
29
54
PROTECTCLIPSIGNAL
CHANNEL 2
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
17
19
22
29
54
PROTECTCLIPSIGNAL
CHANNEL 3
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
17
19
22
29
54
PROTECTCLIPSIGNAL
CHANNEL 4
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
17
19
22
29
54
PROTECTCLIPSIGNAL
7. Protect Indicators
These red LED indicate that the chan-
nel is in Protect mode. When the channel
goes into protect mode all output for that
channel will turn off by output relay. The
protect LED will light when overheating
or other severe problem occur. This is to
protect any speakers connected to the
channel. These LED light for approximate-
ly five seconds whenever the QA Series is
powered on and to fade slowly when the
amplifier is powered off. It is normal.
8. Channel input level control
These four 21-position detented con-
trols adjust input level for their respec-
tive amplifier channels. In Bridged Mono
Mode, only channel 1.3 input level control
are used to adjust signal level. In Parallel
Mode, all four input level control are used
to adjust signal level for their respective
amplifier channels. At their fully counter-
clockwise position, the signal is attenuat-
ed by more than 80dB. At their fully clock-
wise position, the signal is at unity gain.
When 0 dBu of signal arrives at the input
jacks and the Channel input level controls
are set to their fully clockwise position,
the QA Series delivers full power output.
Front Panel Controls
1 12 3 4 7
68 5
2

5
QA4150 / QA4300
Rear Panel Controls
CONNECT 1 BREAKER
CONNECT 2
SPEAKER OUT
~ AC INPUT
230V 50/60Hz,950W
STEREO
BRIDGED
PARALLEL
CH 1
CH 1CH 2
CH 3
CH 2
CH 4
DESIGNED AND ENGINEERED IN KOREA
WARNING
DO NOT EXPOSE
THIS EQUIPMENT
TO RAIN OR
MOISTURE
CAUTION
FOR CONTINUED
PROTECTION AGAINST
RISK OF FIRE, REPLACE
ONLY SAME TYPE FUSE
AVIS
RISQUE DE CHOC
ELECTRONIQUE NE
PAS OUVRIR
ATTENTION
UTILISER UN FUSIBLE
DE RECHANGE MEME
TYPE
CH 1
BR I D G E
CH2
CH 3
CH4
CO N N E C T21
CH 3CH 4
STEREO
BRIDGED
PARALLEL
1. Fan
This is a variable speed cooling fan. Cool-
ing air enters the amplifier through the fan
ports located on front of the amplifier chassis,
Be sure not to block these ports when install-
ing the amplifier or other associated equip-
ment.
2. Input connectors
Connect the input source to these elec-
tronic balanced Combination connectors
using either XLR or 1/4” TRS plugs. The 1/4”
TRS and XLR plug configured as follows :
Pin 2 (Tip) hot, Pin 3 (Ring) cold, and Pin 1
(Sleeve) ground. We recommend the use of
balanced three-conductor cabling wherever
possible. Unbalanced two-conductor 1/4”
plugs can also be inserted into these inputs,
but you will get better signal quality and less
outside noise and hum if you use balanced
lines. Stereo signal should be connected to
all Channel 1~ 4 input jacks ; however ; when
operating the QA Series in Bridged Mono or
Parallel modes, use the Channel 1.3 input
jack only.
3.Bridge / Stereo / Parallel switch
This switch changes the amplifier op-
erating mode from either stereo or mono
bridged or parallel. You can place this switch
in “STEREO” position (center) for normal
stereo operation. When placed in “PARAL-
LEL” position, the channel 1 input signal is
routed to the power amplifier of channel 1&2
and the channel 3 input signal is routed to the
power amplifier of channel 3&4. When placed
“BRIDGED” position, the channel 1 input
signal only is routed to channel 1&2 again. In
this mode the channel 2 input is ignored.(The
channel 3 input signal only is routed to chan-
nel 3&4 in this mode the channel 4 input is
ignored.)
4. 5-way Binding Post
Connect each channel of the QA Series to
4 ohms or 8 ohms loudspeakers.Two pairs
of 5-way binding posts are provided for each
channel, so that paralleling of speakers is
possible.Connection to the binding posts can
be made with bare wire, banana plugs, or
spade lug terminations. Make connections to
all 4 channel terminals for Stereo or Parallel
Mode, or a single connection across the red
terminals of Channel 1 and Channel 2 and
channel 3 and channel 4 for Bridged Mono
Mode.
5. Speakon output connectors
You can use these to connect each chan-
nel of QA Series to 8 ohms or 4 ohms loud-
speakers. Using Speakon speaker cables,
make connections to all 4 channel connectots
for Stereo or Parallel Mode, or to the Bridged
mode connector for Bridged Mono Mode.
Rear Panel Controls
1 12 2 4 4
5 7
6
3

6
QA4150 / QA4300
6. Circuit breaker
The breaker acts in place of common dis-
cardable fuses. This circuit breaker will trip if
there is a fault with the main voltage or if max-
imum output is exceeded. Simply depress the
circuit breaker and power up the unit again.
7. AC input
IEC connector for AC power cable. Con-
nect the supplied heavy-gauge 3-pin IEC
power cable.
Rear Panel Controls

7
QA4150 / QA4300
Protection
Every model in the QA Series incorporates
protection features. The front panel Protection
LED indicates the activity of the relay speaker
connection circuitry in each channel. When
the protection LED turn on, this circuitry is ac-
tive, and all connected speakers are muted.
Initial power-up ; For approximately five
seconds after initial power-up, the protection
circuitry is activated and the speaker outputs
are muted. If everything is operating normally,
you will hear an audible click at the conclu-
sion of this brief period, as the protection cir-
cuitry is deactivated and the QA Series begins
delivering signal to connected speakers. It is
normal for the Protection LED to fade gradu-
ally after the amplifier is powered off.
Thermal Protection ; Abnormally high heat
sink temperatures will engage the Protect
circuitry for the overheating channel only. An
output relay disconnects the speakers until
normal temperature range is restored. During
this time, the Protect LED will light.
To guard against this problem, make sure the
QA Series receives adequate ventilation on all
sides and that both the front and rear panels
are unobstructed. If the power transformer
gets too hot, its thermal switch will discon-
nect all of the secondary power and discon-
nect both channel outputs.
Short circuit ; If output is shorted due to
faulty wiring, the thermal circuitry will auto-
matically protect the amplifier. If this will oc-
cur, the load will be disconnected by thermal
protection circuitry (also output relay opens).
DC Voltage Protection ; If an amplifier chan-
nel detects DC voltage at speaker output,
the output relay immediately open to prevent
speaker damage.
Current limiting Protection ; At the amplifi-
er’s full power limit, or clipping point, the lim-
iter circuitry will be activated. This is indicated
by illumination of the Clip LED. The channel
gain is automatically reduced, protecting the
speakers from the high power. This circuitry
may be activated by uncontrolled feedback,
oscillations, improper equipment gain setting.
And this circuitry is virtually transparent in
operation and full signal bandwidth is main-
tained.
Any time the Protection LED lights up (except
for initial power-up during approximately five
seconds), there is reason to be concerned. If
this occurs, turn the amplifier off immediately
and check carefully all wiring and external
equipments in order to locate and correct the
condition.
Protection

8
QA4150 / QA4300
Setup
Mode Select
STEREO
BRIDGED
PARALLEL
Stereo Mode
In this mode, each channels operate inde-
pendently (typical quard amplifier). Channel 1
input signal feeds channel 1 power amp, and
channel 2 input signal feeds channel 2 power
amp (channel 3 and 4 are operate same as
channel 1 and 2 ). In this mode, the minimum
speaker impedance per channel is 4 Ω
Parallel Mode
In this mode, channels 1 and 2 are operate
two mono amplifier. In this mode channel 1
input signal feeds channel 1 and channel 2
power amp, the minimum speaker impedance
per channel is 4 Ω. Also, channel 3 and 4 are
operate same as channel 1 and 2.
Bridged Mono Mode
In this mode, channels 1,2 or 3,4 are bridged
together and work as one mono amplifier. In
this mode, the minimum speaker impedance
is 8 Ω(Caution: In this mode, channel 2 and 4
volume is set maximum position (0)).
Note : Bridged mono mode is to be used only
when the QA Series is connected to a 8 ohms
speaker load. Use of Bridged mode with
speaker loads of 8 ohms or less can result in
severe damage to the unit due to excessive
heat and current limiting.
Use extreme caution when operating the am-
plifier in Bridged Mono Mode. Never ground
either side of the speaker cable when the am-
plifier is in Bridged Mono Mode ; the speaker
load must “ float “ away from the amplifier
chassis.
Setup

9
QA4150 / QA4300
CONNECT 1
CONNECT 2
SPEAKER OUT
STEREO
BRIDGED
PARALLEL
CH 1
CH 1CH 2
CH 3
CH 2
CH 4
DESIGNED AND ENGINEERED IN KOREA
WARNING
DO NOT EXPOSE
THIS EQUIPMENT
TO RAIN OR
MOISTURE
CAUTION
FOR CONTINUED
PROTECTION AGAINST
RISK OF FIRE, REPLACE
ONLY SAME TYPE FUSE
AVIS
RISQUE DE CHOC
ELECTRONIQUE NE
PAS OUVRIR
ATTENTION
UTILISER UN FUSIBLE
DE RECHANGE MEME
TYPE
CH 1
BR I D G E
CH2
CH 3
CH4
CO N N E C T21
CH 3CH 4
STEREO
BRIDGED
PARALLEL
or or
or or
BBAA
CCDD
Connections
Stereo Mode
Parallel Mode
Bridged Mono Mode
CONNECT 1
CONNECT 2
SPEAKER OUT
STEREO
BRIDGED PARALLEL
CH 1
CH 1CH 2
CH 3
CH 2
CH 4
DESIGNED AND ENGINEERED IN KOREA
WARNING
DO NOT EXPOSE
THIS EQUIPMENT
TO RAIN OR
MOISTURE
CAUTION
FOR CONTINUED
PROTECTION AGAINST
RISK OF FIRE, REPLACE
ONLY SAME TYPE FUSE
AVIS
RISQUE DE CHOC
ELECTRONIQUE NE
PAS OUVRIR
ATTENTION
UTILISER UN FUSIBLE
DE RECHANGE MEME
TYPE
CH 1
BR I D G E
CH2
CH 3
CH4
C O N N E C T21
CH 3CH 4
STEREO
BRIDGED PARALLEL
or
or
AAA
BBB
(5-Way Output Binding Posts)
(5-Way Output Binding Posts)
CONNECT 1
CONNECT 2
SPEAKER OUT
STEREO
BRIDGED PARALLEL
CH 1
CH 1CH 2
CH 3
CH 2
CH 4
DESIGNED AND ENGINEERED IN KOREA
WARNING
DO NOT EXPOSE
THIS EQUIPMENT
TO RAIN OR
MOISTURE
CAUTION
FOR CONTINUED
PROTECTION AGAINST
RISK OF FIRE, REPLACE
ONLY SAME TYPE FUSE
AVIS
RISQUE DE CHOC
ELECTRONIQUE NE
PAS OUVRIR
ATTENTION
UTILISER UN FUSIBLE
DE RECHANGE MEME
TYPE
CH 1
BR I D G E
CH2
CH 3
CH4
C O N N E C T21
CH 3CH 4
STEREO
BRIDGED PARALLEL
Bridged/Mono
Bridged/Mono
or
or
AA
BB
(5-Way Output Binding Posts)
Connections

10
QA4150 / QA4300
CONNECT 1
CONNECT 2
SPEAKER OUT
STEREO
BRIDGED
PARALLEL
CH 1
CH 1CH 2
CH 3
CH 2
CH 4
DESIGNED AND ENGINEERED IN KOREA
WARNING
DO NOT EXPOSE
THIS EQUIPMENT
TO RAIN OR
MOISTURE
CAUTION
FOR CONTINUED
PROTECTION AGAINST
RISK OF FIRE, REPLACE
ONLY SAME TYPE FUSE
AVIS
RISQUE DE CHOC
ELECTRONIQUE NE
PAS OUVRIR
ATTENTION
UTILISER UN FUSIBLE
DE RECHANGE MEME
TYPE
CH 1
BR I D G E
CH2
CH 3
CH4
C O N N E C T21
CH 3CH 4
STEREO
BRIDGED
PARALLEL
B
A
oror
oror
AB
AB
CD CD
Stereo Mode
CONNECT 1
CONNECT 2
SPEAKER OUT
STEREO
BRIDGED
PARALLEL
CH 1
CH 1CH 2
CH 3
CH 2
CH 4
DESIGNED AND ENGINEERED IN KOREA
WARNING
DO NOT EXPOSE
THIS EQUIPMENT
TO RAIN OR
MOISTURE
CAUTION
FOR CONTINUED
PROTECTION AGAINST
RISK OF FIRE, REPLACE
ONLY SAME TYPE FUSE
AVIS
RISQUE DE CHOC
ELECTRONIQUE NE
PAS OUVRIR
ATTENTION
UTILISER UN FUSIBLE
DE RECHANGE MEME
TYPE
CH 1
BR I D G E
CH2
CH 3
CH4
C O N N E C T21
CH 3CH 4
STEREO
BRIDGED
PARALLEL
B
A
or
or
AA
BB
A
B
Parallel Mode
Bridged Mono Mode
CONNECT 1
CONNECT 2
SPEAKER OUT
STEREO
BRIDGED PARALLEL
CH 1
CH 1CH 2
CH 3
CH 2
CH 4
DESIGNED AND ENGINEERED IN KOREA
WARNING
DO NOT EXPOSE
THIS EQUIPMENT
TO RAIN OR
MOISTURE
CAUTION
FOR CONTINUED
PROTECTION AGAINST
RISK OF FIRE, REPLACE
ONLY SAME TYPE FUSE
AVIS
RISQUE DE CHOC
ELECTRONIQUE NE
PAS OUVRIR
ATTENTION
UTILISER UN FUSIBLE
DE RECHANGE MEME
TYPE
CH 1
BR I D G E
CH2
CH 3
CH4
C O N N E C T21
CH 3CH 4
STEREO
BRIDGED PARALLEL
B
A
or
or
Bridged/Mono
Bridged/Mono
SPK+ to PIN 2+
SPK- to PIN 2-
SPK+ to PIN 2+
SPK- to PIN 2-
SPK+ to PIN 2+
SPK- to PIN 2-
SPK+ to PIN 1+
SPK- to PIN 1-
SPK+ to PIN 1+
SPK- to PIN 1-
SPK+ to PIN 1+
SPK- to PIN 1-
SPK+ to PIN 1+
SPK- to PIN 1-
SPK+ to PIN 1+
SPK- to PIN 1-
SPK+ to PIN 1+
SPK- to PIN 2+
SPK+ to PIN 1+
SPK- to PIN 2+
Connections

11
QA4150 / QA4300
Wiring
These are several ways to interface the QA series amplifier to support a variety of applications.
The QA series features balanced inputs and outputs, so connecting balanced and unbalanced
signals is possibles.
Unbalances 1/4” Connector
Balances TRS 1/4” Connector
XLR Balanced Wiring Guide
Speakon® Output Connector
Wiring

12
QA4150 / QA4300
QA 4150 QA 4300
Rated Output Power Stereo Four Channel Driven
8 ohms 100 W 200 W
4 ohms 150 W 300 W
Rated Output Power Bridged Mono
8 ohms 300 W 600 W
Signal to Noise Ratio
(20 Hz ~ 20k Hz) 100dB 100dB
Distortion (SMPTE-IM) 0.05% 0.05%
Input sensitivity @8 ohms 4dBu 4dBu
Voltage Gain 27dB 30dB
Output Circuitry AB AB
Current Consumption 120Vac / 240Vac
@ 1/8 power @4 ohms 5.0A / 2.4A 9.5A / 4.6A
@ 1/3 power @4 ohms 7.5A / 4.0A 14.5A / 7.4A
@ Rated power @4 ohms 11.0A / 5.8A 1.5A / 11.2A
Distortion
0.01% 0.01%20 Hz-20k Hz Half Power
1k Hz Rated Power 0.1% 0.1%
Frequency Response 0/-0.5dB ; 20Hz-20KHz, 0/-3dB ; 5Hz-60KHz
Damping Factor (400 Hz) 200 200
Input Impedance 15Kohm Unbalanced, 30Kohm Balanced
Input Clipping 22dBu (10Vrms)
Cooling Continuously variable speed, Front to rear
Connectors (each)
Input Active balanced combo (XLR and 1/4” TRS common use)
Output 5-way Binding post and Speakon
Control
Front AC power switch, Channel 1 & 2 & 3 & 4 volume
Rear Mode selector switch
Indicators Active(blue), Protection(red), Clip(yellow), Signal (green)
Protection Short circuit, Thermal, Current limit, Current inrush, RF protection, Turn on / Turn
off muting
Power requirements 100, 120/240Vac, 50/60Hz
Dimensions (W × H × D) 19”(482mm) × 3.5”(88mm) × 16.5”(420 mm)
Net Weight 40 lb
(20.9 kg)
51.1 lb
(23.2 kg)
Necessary modifications are carried out without notice.
Specifications
Specifications