®
20/20™ S250
™
System S ubw oofer
USER GUIDE
20/20 S250 SYSTEM SUBWOOFER GUIDE2
T
hank you for choosing the 20/20 S250 System Subwoofer. To get the
most from your new subwoofer, please take a moment to read this
manual and familiarize yourself with the product’s features, set-up, and use.
About the 20/20 S250 System Subwoofer
Everyone wants more bottom end from their audio setup, and the Event
self-powered 20/20 S250 System Subwoofer makes an excellent foundation
for an extended bandwidth monitoring system. With five balanced inputs
and pass-throughs for active monitors, the 20/20 S250 provides low
frequency bandwidth and power extension to all audio channels in mono,
stereo, and 5.1 surround monitoring systems. A sixth balanced input is
available for monitoring the separate Low Frequency Effects (LFE) “.1”
signal, along with its own pass-through for feeding multiple subs when
room size or program material demands more acoustic output.
The 20/20 S250’s variable crossover allows you to tune the subwoofer to
your active monitors’ natural low-end response. This produces the lowest
possible sub-to-monitor crossover frequency, which results in more
accurate monitor system performance, and more options for subwoofer
placement in the studio. Other subwoofer systems only pass the front
channels through a fixed 80Hz crossover, which changes the low frequency sonic character of the monitors and unnaturally redirects more
audible acoustic energy though a single low frequency channel.
The 20/20 S250’s versatile Bass Management System includes the five
monitor inputs and a monitor group level control. This feeds the active
variable crossover, a continuously variable 0-180° phase delay control,
and a polarity invert switch. There’s also a monitor input disable switch for
instant in/out selection. The separate LFE input has its own level control
and a separate crossover fixed at 120Hz. Everything works together as a
system: The 20/20 S250 System Subwoofer.
Crossover, phase, and polarity settings for Event Direct Field Monitors are
included in this user guide. Additional information can be found at
www.eventelectronics.com.
20/20 S250 SYSTEM SUBWOOFER USER GUIDE
Setup
The monitoring format and room size generally dictate subwoofer set-up.
The 20/20 S250 System Subwoofer supports Mono, Stereo, and 5.1 channel formats, plus most anything in-between.
If you are confused about integrating a subwoofer into your stereo
monitoring system, or about how to set up your surround speakers with a
subwoofer, don’t worry: If you currently have an accurate set of active
direct field monitors up and running—that is, properly placed in front of
you in a reasonable acoustic environment—then you are likely ready to
place, connect, and use the 20/20 S250. And, if your control room is large
enough, with some space behind the listening position, you can add three
more of the same monitors mounted at the same height as your existing
monitors, and be ready for 5.1 surround monitoring.
The truth is that the same acoustic principals apply whether you have two
speakers or six. You cannot go wrong if you follow these few guidelines:
• Start with good monitors. If you have two trusted direct field monitors,
get three more of the identical kind for your surround monitoring system.
Good stereo monitors make good surround monitors.
• It seems obvious to place both speakers in a stereo pair equal distance
away from the listening position. We do this instinctively to maintain stereo
balance. The same rule applies to surround monitoring where all the
speakers (fronts, rears, and subwoofer) are placed at equal distance to the
3
Unpacking
The shipping container is designed to protect your subwoofer during
transit. Please unpack and check your subwoofer carefully, and
immediately report any damage to your dealer or to the company that
delivered the subwoofer to you. The packing materials are designed to be
reused—do not discard them. If you need to return the subwoofer to the
factory for repair, it must be shipped in the original packaging.
Connections and Operation
The 20/20 S250 is ideally suited for monitoring the LFE channel, extending
the overall low frequency response of an active monitoring system, or
doing both simultaneously.
• LFE monitoring only. Feed the LFE signal via the LFE input
connector and set the subwoofer level with the LFE Input Sensitivity
control. If you are using speakers other than Event Direct Field
Monitors, star t with the Polarity Invert switch in the out (of f)
position, and set the Phase Delay control to 0°. These controls may
need adjustment if your LFE program material must have a specific
phase relationship to the main program material. If you are using
20/20 S250 SYSTEM SUBWOOFER GUIDE
4
listening position. After placing all the speakers on the diameter of a circle
in this manner, with the listening position in the center, distance-related
amplitude and time offsets will be minimal.
• The final element, positioning on the circle, is determined by your
format. In the case of a mono system, both the single monitor and
subwoofer are placed directly in front of the listening position, the monitor
at ear level, usually directly above the sub.
• In a stereo system, the two nearfield monitors typically sit 60°apart, or
30°on either side of straight-ahead, again positioned close to ear level. If
you are using one subwoofer, place it on the circle between the two
speakers. If you have two subs, one for each channel, place them directly
under each monitor, again keeping everything on the circle.
• Finally, surround formats with front, center and rear speakers fill in
additional angles on the circle. The center channel is obviously located front
and center, with the two remaining front speakers at least 30°on either side
of center, or 60° from each other . The two rear surround monitors are often
spaced wider apart than the front speakers—sometimes as much as 120°.
Event Direct Field Monitors, we recommend the settings found in the
table on page 6.
• Extending the low frequency response of your active monitoring
system. This works for mono, stereo, and 5.1. Instead of connecting your
audio source directly to your active monitors, connect the source to the five
monitor channel inputs on the 20/20 S250, and feed the pass-throughs
from those inputs to your monitors. The five monitor channels are marked
on the 20/20 S250 amplifier panel for convenience during wiring, but all of
the five inputs are identical and are summed equally within the subwoofer.
If you are using any speakers other than Event Direct Field Monitors, start
with the Polarity Invert switch in the out (off) position, and set the Phase
Delay control to 0°. If you are using Event Direct Field Monitors, we
recommend using the settings found in the table on page 6.
Signals coming into the subwoofer via the five monitor inputs are muted
with the Monitor Disable button. This mutes the Subwoofer if there’s no
LFE input.
20/20 S250 SYSTEM SUBWOOFER USER GUIDE 5
• Putting it all together. The 20/20 S250 System Subwoofer is in full
form in a 5.1 surround system where all five monitor inputs are used along
with the LFE input. If you are using any speakers other than Event Direct
Field Monitors, start with the Polarity Invert switch in the out (off) position
and set the Phase Delay control to 0°. These controls may need adjustment
if your LFE program material must have a specific phase relationship to the
main program material. If you are using Event Direct Field Monitors, we
recommend the settings found in the table on Page 6.
The Subwoofer’s Phase Delay control is also used to maintain good
crossover alignment when the Subwoofer can’t be placed on the circle.
Notice the OFFSET column below. Refer to it when the subwoofer must sit
outside the circle.
20/20 S250 SYSTEM SUBWOOFER USER GUIDE6
Event Monitor
20/20bas
PS8 • TR8
PS6
PS5 • TR5
Sub Offset
Outside Circle
0
+3’
+6’
+9’
0
+3’
+6’
0
+3’
+6’
Monitor - Sub
Crossover
Frequency
35Hz
35Hx
35Hz
35Hz
40Hz
40Hz
40Hz
50Hz
50Hz
50Hz
Polarity
Invert
Normal
Normal
Normal
Invert
Invert
Invert
Invert
Invert
Invert
Phase Delay
0°
120°
80°
20°
100°
+60°
0°
70°
100°
60°
Figure 1. Recommended settings for using the 20/20 S250 System Subwoofer
with Event monitors.
Care and Maintenance
Your 20/20 S250 System Subwoofer is simple to care for and maintain. The
cabinet is finished with a durable vinyl laminate that can be cleaned with a
soft damp cloth. Avoid touching the exposed speaker element. Do not
expose the rear panel controls, connectors, or the speaker element to
moisture or chemicals. Do not expose the unit to dripping or splashing
liquids; objects filled with liquids should not be placed on the unit.
The circuit breaker is located just below the power switch on the 20/20
S250 amplifier panel. If it opens, you can reset it with a push. If it remains
open, please refer the unit to service to qualified personnel.
Caution: When the power switch is off, the internal amplifier components
are still connected to the AC mains.
Contacting Customer Service
If you experience any trouble with your 20/20 S250 System Subwoofer,
please call the Event Electronics Customer Service department at 805-5667777, ext. 5. Before calling, however, we ask that you please consult the
Technical Support section of our Web site, www.eventelectronics.com.
If you believe your 20/20 S250 System Subwoofer is in need of repair,
please contact the Event Electronics Customer Service department to
request a Retur n Authorization Number (RA#). We can accept for
servicing only those units that are accompanied by an RA#. Units shipped
without an RA# number will be refused.
20/20 S250 System Subwoofer Specifications
Low Frequency Driver: Long-throw 15" coated paper cone with foam surround and hightemperature voice coil
Frequency Response: 28Hz – 120Hz, -3dB
Amplifier Power: 250W, Linear
LFE Crossover: -3dB at 120Hz, 3rd order
Monitor Blend Crossover -3dB, variable 30Hz – 80Hz, third order
Maximum Sound Pressure Level: 117dB peak @ 1 meter
Noise: >100dB below full output, 1kHz BW
Inputs: One LFE channel, five mains monitor channels. All inputs 40k ohm balanced via gold
combination XLR-1/4" connectors
Monitor Input Sensitivity: 1.1V at any Monitor Input produces full output with Monitor
Group Input Sensitivity control at maximum.
LFE Input Sensitivity: 0.35V at any LFE Input produces full output with LFE Input
Sensitivity control at maximum
Pass-Through Outputs: One LFE channel pass-through, five mains monitor channel pass-
throughs, all via male XLR connectors
Controls: LFE Input Sensitivity, Polarity Invert, Phase Delay, Monitor Group Input Sensitiv-
ity, Monitor Input Disable, Monitor-Sub Crossover Tuning, Mains Power
20/20 S250 SYSTEM SUBWOOFER USER GUIDE 7
20/20 S250 System Subwoofer Specifications (cont.)
Indicators: Power ON/Overload LED
Power Requirements: 300VA, factory programmed for either 120V~ 60Hz,
220-240V~ 50-60Hz, or 100V~ 50-60Hz mains
Polarity: Positive signal at any + input produces outward LF cone displacement (with Polarity
Invert off)
Cabinet: 3/4" vinyl-laminated MDF, internally insulated
Dimensions: 20.25" W x 17.5" H x 17" D
Weight: 64lbs
Specifications subject to change without notice.
20/20 S250 System Subwoofer User Guide
©2002 Event Electronics, LLC
P.O. Box 4189
Santa Barbara, CA 93140-4189
www.eventelectronics.com
Event Electronics® is a registered trademark of Event Electronics, LLC.
S250, 20/20, 20/20bas, S250, Project Studio, and Tuned Reference are
trademarks of Event Electronics, LLC.
20/20 S250 SYSTEM SUBWOOFER USER GUIDE8
11/02 2204
Loading...