Event electronic Speaker S250 TM User Manual

2 0 /2 0 S 2 5 0  
Sys te m Subwoofe r  
USER GUIDE  
®
 
20/20 S250 SYSTEM SUBWOOFER USER GUIDE  
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.  
S e tup  
The monitoring format and room size generally dictate subwoofer set-up.  
The 20/ 20 S250 System Subwoofer supports Mono, Stereo, and 5.1 chan-  
nel 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, dont 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  
 
4
20/20 S250 SYSTEM SUBWOOFER GUIDE  
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°.  
Conne ctions and Ope ration  
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 m on itorin g on ly. 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 Inver t 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  
 
20/20 S250 SYSTEM SUBWOOFER USER GUIDE  
5
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 theres no  
LFE input.  
P utting 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 Subwoofers Phase Delay control is also used to maintain good  
crossover alignment when the Subwoofer cant be placed on the circle.  
Notice the OFFSET column below. Refer to it when the subwoofer must sit  
outside the circle.  
 
6
20/20 S250 SYSTEM SUBWOOFER USER GUIDE  
Event Monitor  
Sub Offset  
Outside Circle  
Monitor - Sub  
Crossover  
Polarity  
Phase Delay  
Frequency  
20/ 20bas  
0
Invert  
0°  
35Hz  
PS8 • TR8  
+3’  
Normal  
120°  
35Hx  
+6’  
+9’  
0
Normal  
Normal  
Invert  
Invert  
Invert  
Invert  
Invert  
Invert  
80°  
20°  
35Hz  
35Hz  
40Hz  
40Hz  
40Hz  
50Hz  
50Hz  
50Hz  
PS6  
100°  
+60°  
0°  
+3’  
+6’  
0
PS5 • TR5  
70°  
+3’  
+6’  
100°  
60°  
Figure 1. Recommended settings for using the 20/ 20 S250 System Subwoofer  
with Event monitors.  
Care and Mainte nance  
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.  
 
20/20 S250 SYSTEM SUBWOOFER USER GUIDE  
7
Contacting Cus tom e r S e rvice  
If you experience any trouble with your 20/ 20 S250 System Subwoofer,  
please call the Event Electronics Customer Service department at 805-566-  
7777, 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 Ser vice department to  
request a Return Authorization Number (RA#). We can accept for  
ser vicing only those units that are accompanied by an RA#. Units shipped  
without an RA# number will be refused.  
2 0 /2 0 S 2 5 0 S ys te m S ubwoofe r S pe cifications  
Low Frequency Driver: Long-throw 15" coated paper cone with foam surround and high-  
temperature voice coil  
Frequency Response: 28Hz – 120Hz, -3dB  
Amplifier P ower: 250W, Linear  
LFE Crossover: -3dB at 120Hz, 3rd order  
Monitor Blend Crossover -3dB, variable 30Hz – 80Hz, third order  
Maximum Sound P ressure 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  
P ass-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  
 
8
20/20 S250 SYSTEM SUBWOOFER USER GUIDE  
2 0 /2 0 S 2 5 0 S ys te m S ubwoofe r S pe cifications (cont.)  
Indicators: Power ON/ Overload LED  
P ower Requirements: 300VA, factory programmed for either 120V~ 60Hz,  
220-240V~ 50-60Hz, or 100V~ 50-60Hz mains  
P olarity: 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.  
2 0 /2 0 S 2 5 0 S ys te m S ubwoofe r Us e r Guide  
©2002 Event Electronics, LLC  
P.O. Box 4189  
Santa Barbara, CA 93140-4189  
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.  
11/02 2204  
 

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