AS-B Manual 17_06_05.cdr - Commercial Audio Solutions

AS-B
ACTIVE
SUBWOOFER
USER MANUAL
USER MANUAL
AS-B ACTIVE SUBWOOFER
The information contained within this manual does not include all of the details of design, production or
variations of the equipment. Nor does it cover every possible situation that may arise during installation,
operation or maintenance. If you need particular assistance beyond the scope of this manual please contact our
technical staff.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING! RISK OF HAZARDOUS ENERGY!
Magnetic Field - Caution
TO REDUCE RISK OF ELECTRIC SHOCK OR FIRE DO NOT
EXPOSE TO RAIN OR MOISTURE.
Do not locate sensitive high-gain equipment such as
pre- amplifier or tape decks directly above or below the
unit.
NO USER SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
UNIT MUST BE EARTHED AND CORRECTLY FUSED.
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 at the back of the unit.
The lightning bolt triangle is used to alert
the user to the presence of un-insulated
“dangerous voltage” within the unit that
may constitute a risk of electric shock.
The exclamation mark triangle is used to
alert the user to important operating or
maintenance instructions in the
literature accompanying the product.
CE Conformity
Features
This equipment has been tested and found to conform
to the requirements of the EMC Directive 89/336/EEC,
the requirements of the Low Voltage Directive
73/23/EEC, amended by 93/68/EEC and to the
following standards:
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EMC Emission
EN55103-1 (1996)
EMC Immunity EN55103-2 (1996)
Electrical Safety EN60065 (1998)
2
Soft Start
DC Fault Protection
Thermal Cut Off (85ºC Protection and 82ºC Working)
Current Limiting
User Selectable Input Sensitivity
Inputs and Links on XLR or Phono Sockets
Outputs on Neutrik Speakons®
Attractive styling
AS-B ACTIVE SUBWOOFER
Introduction
Congratulations on having purchased an OHM AS-B Active Subwoofer.
Please read this manual and familiarise yourself with the operation of your OHM AS-B Active Subwoofer before
you attempt to power up this unit. For your own safety we recommend you take the time to read all the warnings
and precautions on the page opposite and study the connection details to ensure correct usage and avoid any
misuse which may invalidate your warranty.
Record the model and serial number, found on the back of the unit, in the spaces designated on the warranty
card and in the space provided below. Refer to the model and serial number whenever you call upon your dealer
for information or service on this product.
Model
Serial Number
Unpacking
Carefully open the shipping carton and check for any noticeable damage.
Every OHM AS-B Active Subwoofer has been rigorously tested and inspected before being carefully packaged, prior to
shipping. If any damage has occurred to the packaging or the unit during transit, please notify the delivery company as
soon as possible. Only the consignee can file a claim against the carrier for shipping damage. Be sure to save the carton
and all packing materials for the carriers inspection.
We recommend that you retain the original carton and packing materials for use should you transport or ship the unit in future.
Mounting
Enclosure should be positioned far enough away from a wall so as not to impede airflow from the fan. Auto
power selected means that the unit reverts to a standby mode if a signal in not detected after a few minutes,
likewise the unit ‘wakes up’ when a signal is present.
Environment
Unrestricted airflow to and from the amplifier is crucial to maintain optimal performance. The air which is drawn in
through the vents on the rear is forced through the heatsink channels to exit at the rear. It is important to provide
sufficient ventilation at the rear of the amplifier. Cool air should be made available to assist control of the internal
temperature whenever possible.
Precautions
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Retain this manual for future reference.
Always check that the correctly rated power is supplied to your amplifier.
Do not allow the ventilation holes at the rear of the amplifier to get blocked or obstructed in any way.
Pay attention to the information on the rear of the amplifier, particularly the wiring details for the inputs and outputs.
Ensure the mode switches (Sensitivity, Phase, Crossover, Auto switch, Earth lift) are in the correct position for the
required operating mode and all necessary input and output connections are made before switching on your amplifier.
Under no circumstances should you connect the speaker outputs to the input or output stages of any other amplifier.
Never short the “live” inputs or outputs to ground.
Do not switch on multiple amplifiers at the same time.
Avoid direct contact of your amplifier with water or other liquids. Do not operate while standing in liquid.
When cleaning the amplifier wipe with a soft, dry cloth. If more heavy duty cleaning is required disconnect from
the mains and use a damp cloth, ensuring that the unit is completely dry before reconnecting to the mains.
Do not use solvents or chemicals on the exterior of the amplifier as they may cause the surface to discolour and peel.
Do not use this unit if the power cord is frayed or broken.
If you experience continuous problems, disconnect from the mains and refer to a qualified service engineer.
3
6
7
SATS
SUB
8
1
2
3
4
5
FRONT
1 Rubber Feet.
Anti skid feet are fitted to the bottom of the cabinet
to stop the cabinet from skating about the floor.
2 Bass Driver.
Two Heavy duty 10” proprietary Cast Aluminum
Chassis Bass Woofers with 2” voice coils and large
magnet assemblies ensure longevity and
exceptional power handling.
6 Attractive Cabinet Styling.
Substantial 18mm heavily braced MDF housing
painted in OHM Anthracite, hard wearing paint.
7 Dual Port Tubes.
Reflex loaded port design bass enclosure.
Substantially sized port tubes are used to avoid air
noise, so apparent in lesser systems.
8 and 9 Two Recessed Pocket Handles.
3
Perforated Kickproof Grill.
Custom made 1.6mm thick perforated metal mesh.
Powder coated for durability. Offers protection to
the drivers especially if the cabinets low profile is
fully taken advantage of in under bench seating
areas.
4 Stainless Steel Logo.
Attractive stainless steel brushed logo fitted with
Left and Right Satellite blue status LED indicating
that the amplifiers are operational.
5 Reticulated Foam Front.
One per side. Provided to facilitate easy moving of
the unit.
DESIGN PHILOSOPHY
The AS-B is designed to be used as the basis of a
sub/sat system or as an add on to an existing system
where additional low frequency capability is required.
The AS-B can be used with any speakers with an
impedance not lower than four ohms. Recommended
Ohm speakers can be found on page six.
PROTECTION
Built in Limiter.
Glued on to the perforated metal mesh. Attractive
and prevents direct spillage and dust contaminating
the loudspeaker cones.
4
Each channel of the AS-B comes with a Built in
Limiter to prevent the amplifier being over driven.
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AS-B ACTIVE SUBWOOFER
MADE BY THE OHM GROUP
1 2 3
4 5
6
7
8 9 10 11 12 13 14
15
16
17
18 1920
REAR PANEL
1
2
and 7 Left and Right Input Connectors.
Electronically balanced Neutrik® input Combi sockets
accept 1/4 Balanced Jack plugs or male XLR Connectors.
Wired as follows:
Pin 1 (sleeve)= Ground, Pin 2 (tip)= Hot, Pin 3
(ring)= Cold
Heatsink Ventilation Slots
Do not obstruct these slots as the amplifier requires
unrestricted airflow to aid cooling.
3 and 6 Left and Right Link Connectors.
Electronically balanced Neutrik® Link sockets
accept XLR Female connectors. Wired as follows:
Pin 1 = Ground, Pin 2 = Hot, Pin 3 = Cold
4
and 5 Phono Inputs / Links
Wired as follows:
Sleeve = Ground, Tip = Live
8
Input Sensitivity Switch.
Two position sensitivity switch.
Full output power for an input level of 1.40V
Full output power for an input level of 0.77V
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Phase Reverse
0° - 180° Reverses the phase of the system.
12 Mid High Gain Control
Adjusts the volume level of the left and right
satellite outputs.
13 Auto Power Switch
Senses if signal is present and switches on or off
accordingly. Unit remains in standby mode.
14 Earth Switch
Setting this switch from GROUND to LIFT
separates the signal ground from the chassis
ground, thus breaking the “Ground Loop” between
adjacent chassis grounds in the signal path.
15 and 16 Left and Right Output Neutrik Speakons®
Left and right satellite speaker outputs minimum
impedance 4 ohms per channel. Use cable with a
minimum 1.5mm cross section. Wired as follows:
Pin 1+ = positive, Pin 1- = Negative
17 IEC Fused Mains Inlet
A heavy duty lead is provided. If the panel fuse fails
always replace with a correctly rated substitute.
18 Mains Switch
Switches the amplifier on and off.
10 Bass Gain Control
Adjusts the volume level of the Subwoofer.
Left and right input signals are summed as a mono
signal.
19 Power on LED
When lit, this LED indicates that the Amplifier is
switched on.
11 X-Over Frequency control
Fine tunes the x-over frequency between 100Hz
and 150Hz. Adjust to personal preference.
20 Cooling Fan
Provides assisted cooling to the internal heatsink,
the fans airflow must not be obstructed.
5
*
2 x KS-1 (8Ω)
5¼” Bass unit and
14mm polycarbonite
High Frequency unit.
*
KC-1
SWB
S-SA
a
Speakon
option
KC-3
SWB
S-SA
a
Speakon
b
option
BC-5
SWB
S-SA
Speakon
a option
b
BC-6
SWB
S-SA
Speakon
a option
b
BC-8
LWB
W-SA
b
2 x KS-3 (8Ω)
8” Bass unit and high
efficiency Bullet Tweeter.
*
4 x BR-5 (16Ω)
6”, 35mm coil Bass unit
and 1” Horn loaded
Soft Dome Tweeter.
*
2 x BR-6 (8Ω)
2 x 6”, 35mm coil Bass
units and Fluid Cooled
Dual Phasing Plug
Bullet Tweeter.
2 x BR-8 (8Ω)
2 x 8” Bass units and
2 x Fluid Cooled Dual
Phasing Plug Bullet
Tweeters.
Minimum Load 4 Ohms per channel
Notes:
4Ω 4Ω
a
The SS-A stand adapter allowing
cabinets to pan and tilt can be
used in conjunction with the SS-1
heavy duty speaker stand.
b
Business Music* speakers are
fitted with binding posts as
standard, for hard-wiring or use
of Pomona plugs.
A factory
fitted dual Neutrik® Speakon
option is available.
c
The BR-8 is fitted as standard
with dual Neutrik® Speakon
connectors, EP-5’s are available
as a factory fitted option. The
enclosure is fitted with a top hat
as standard to accept the SS-1
heavy duty speaker Stand.
d
The WS-A attaches to the LWB
wall bracket and fits into the
recess when the top hat is
removed. This accessory allows
the cabinet to pan and tilt.
MADE BY THE OHM GROUP
SS-1 Heavy Duty Speaker Stand
Model
6
Impedance
(ohms)
Power
Handling
Rms Watts
Programme
Watts
Spl
1w/1m
(db)
Max @
1m
(db)
Frequency
Response
(-3db)
Crossover
Active
Crossover
d EP-5 option c
Dispersion
Dimensions
Weight
3.8
KS-1
8
50
100
88
107.5
90Hz-20kHz
5kHz
110Hz
100 x 100
192x257x192
KS-3
8
100
200
89
111
75Hz-20kHz
3.6kHz
100Hz
100 x 100
248x350x234
8.0
BR-5
16
100
200
92
111
125Hz-20kHz
7kHz
110Hz
120 x 80
280x189x184
4.8
BR-6
8
200
400
94
117
125Hz-20kHz
5kHz
110Hz
100 x 80
410x189x184
7.6
BR-8
8
250
450
101
125
80Hz-20kHz
4.2kHz
100Hz
160 x 80
336x458x315
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AS-B ACTIVE SUBWOOFER
Amplifier Power Ratings and Specifications
Output Power (1kHz THD<0.1%)
NOTES:
Mid-Hi 2 x 200 Watts into 4 Ohms
Subwoofer 300 Watts into 4 Ohms
Signal Noise Ratio (A-Weighted)
>100dB
Input Impedance
20K Ohm Balanced
Input Sensitivity
0.77 V
1.4 V
Variable Crossover
100Hz - 150Hz
Input Connectors
Neutrik® Combo,
RCA Phono
Link Connectors
Neutrik® XLR
Output Connectors
Neutrik® Speakon Connectors
Protection
Full Short Circuit
Open Circuit
Thermal
On/Off Muting
Limiter
Cooling
Two Speed Fan
Power Supply
AC 230V 50Hz
Controls
0.77 V / 1.4 V Input Sensitivity Switch
0°/180° Phase Switch
Bass Gain Left + Right Summed
Crossover Frequency
Mid-Hi Gain (Left and Right)
Auto Power Switch
Earth Lift Switch
Mains Switch
Dimensions (mm) (H x W x D)
313 x 670 x 580
Weight (Kgs)
38
As part of our continuous R & D programme,
reserves the right to change specifications without prior notice.
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