Electro Voice Speaker SBA750 User Manual

SbA750 User Manual  
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Table of Contents  
0 Introduction.............................................................................................................................................................. 1  
Unpacking and Warranty ............................................................................................................................... 1  
Setup and Connections ................................................................................................................................. 1  
1 Quick Start ............................................................................................................................................................... 2  
2 Controls ................................................................................................................................................................... 3  
Input L/Mono Input R ..................................................................................................................................... 3  
Parallel Outputs L/R....................................................................................................................................... 3  
Mid-High Outputs L/R .................................................................................................................................... 3  
Level .............................................................................................................................................................. 3  
Status Indicators ............................................................................................................................................ 4  
Power Switch ................................................................................................................................................. 4  
AC Fuse ........................................................................................................................................................ 4  
AC Connector ................................................................................................................................................ 4  
3 Cabling .................................................................................................................................................................... 5  
4 Setup Example A ..................................................................................................................................................... 6  
5 Setup Example B ..................................................................................................................................................... 7  
6 Setup Example C..................................................................................................................................................... 8  
7 Setup Example D..................................................................................................................................................... 9  
8 Setup Example E ................................................................................................................................................... 10  
9 Specifications .........................................................................................................................................................11  
10 Dimensions...........................................................................................................................................................11  
11 Block Diagram ..................................................................................................................................................... 12  
Electro-Voice®  
TOC  
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0. Introduction  
Congratulations! In buying an Electro-Voice® SbA750 you decided on getting one of today’s most ad-  
vanced active subwoofers incorporating sophisticated technology.  
The active 15" subwoofer SbA750 with integrated 750 watt power amplifier has been specially designed to  
provide fundamental bass support for professional full-range and multi-channel cabinets. Through the  
integrated electronic frequency crossover of the SbA750 setting up an active stereo multi-channel system  
is truly simple. The stereo audio signals for the mid-high range cabinets are provided via the MID-HIGH  
outputs on the SbA750. Additionally provided are all connection facilities for using the SbA750 as active  
mono subwoofer in active 2-way or “add-on operation”. Manufactured from baltic birch and housing a high-  
performance Electro-Voice® DL15Y woofer, the SbA750 withstands even the hardest strain during transport  
and operation. While input connection is also possible via phone type jacks, all input and output signals are  
output via professional XLR-type connectors. The integrated High-Efficiency 750W power amplifier opti-  
mally matches the DL15Y woofer offering highest dynamic and audio performance and ensures at the  
same time that the DL15Y woofer is always operated in its optimum operation range. Extensive protection  
circuitry like VCP, DC/HF-protection, audio limiter, Back-EMF protection and thermal protection are em-  
ployed to securely monitor the compliance to these operation limits guaranteeing that the SbA750 provides  
outstanding performance even under most demanding conditions. The SbA750 is also especially suitable  
for many rental applications. Compared to Class-AB-operated amps and because of utilizing Class-H High-  
Efficiency technology the power amplifier produces significantly less power loss, and additionally reduces  
thermal stress of all components. Employing fans to ensure thermal stability is not necessary because of  
the Class-H technology and use of comprehensively dimensioned cooling profiles. The enclosure is sealed  
with extremely durable Futura coating and a robust powder-coated steel grille provides protection for the  
Electro-Voice® DL15Y woofer against mechanical damage. All controls and the cooling profiles of the power  
amp module are recessed to provide optimum protection for the sensitive parts of the SbA750 even during  
transportation. Two carrying handles, four castors and an integrated threaded pole-mount stand flange  
allow comfortable transportation and optimum, space saving installation. Because of its versatility, the  
SbA750 can be easily integrated into any existing sound reinforcement installation.  
Unpacking and Warranty  
Open the packing and carefully take out the SbA750. Remove the protective foil from the carrying handles.  
A power cord and the warranty card are supplied in addition to this owner’s manual. Please make sure that  
all details are filled in on the warranty card. Only a completely filled in warranty certificate entitles you to  
stake any warranty claims. Therefore, keep the original invoice together with the warranty certificate at a  
safe place.  
Setup and Connections  
Place the SbA750 on an even ground if possibly by using the supplied rubber feet to ensure safe opera-  
tion. Make sure to check the stability of the system when using pole-mount stands. Do not cover the heat  
sink on the subwoofer’s rear during operation. Otherwise, the SbA750 will enter protection mode because  
of thermal overload. Although this provides reliable protection for the subwoofer, sound reproduction is  
muted until the normal operation mode is regained. AC power is supplied via the Neutrik’s professional  
“PowerCon” connector system and by use of an 15’ (5m) AC cord. This ensures an absolute secure and  
reliable power supply connection. However, with large installations consisting of several active cabinets, the  
use of high-quality AC distributors that allow high power consumption and offer reliable protection through-  
out the entire system is strongly recommended.  
Before establishing the AC connection for the first time, make sure that the SbA750’s operation  
voltage setting, which can be found on a label next to the AC switch, corresponds to your local  
AC voltage.  
1
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1. Quick Start  
Caution: Before switching on the power of the SbA750 always set the LEVEL control to its  
counterclockwise stop. A playing sound source could otherwise lead to extreme  
output levels.  
This Quick Start Manual outlines the set up and operation of a SbA750 used as add-on subwoofer together  
with a Powermixer (see configuration examples). The operation procedures are equivalent for other  
mixers.  
1. Set up your Powermixer system as usual and connect a signal source to the power mixer (e.g. CD  
Player or microphone).  
2. Place your SbA750 somewhere between your full-range cabinets.  
3. Set the SbA750’s LEVEL control to its counterclockwise stop and connect the unit to a wall outlet using  
the supplied PowerCon mains cord.  
4. Use a stereo phone plug cable to connect the Powermixer’s MONO OUT to the SbA750’s L/MONO  
INPUT.  
5. Move the Mixer MONO OUT fader all the way down.  
6. Be sure to switch on the Mixer first and then the SbA750.  
Switching on the SbA750 last is recommended. Otherwise, unwanted power-on noise might occur.  
When switching off your equipment, please proceed in the opposite order, i.e. switch off the  
SbA750 first.  
7. Set the SbA750’s LEVEL control to its center position (0dB) and start the playback of the desired signal  
audio source.  
8. After adjusting the desired acoustic output level of the full-range cabinets using the Powermixer’s master  
fader, establish volume setting for the subwoofer using the MONO OUT fader.  
Electro-Voice®  
2
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2. Controls  
Input L/Mono, Input R  
Electronically balanced inputs for the connection of high-  
level signal sources such as mixers, signal  
processors, etc. Establishing the connection is possible via  
phone or XLR-type jacks. Balanced connection  
is recommended to prevent noise or HF-interference.  
Caution: Before connecting or disconnecting any plugs,  
make sure to set the level control to its counterclockwise  
stop, which prevents the system, the audience and yourself  
from being stressed by nasty contact noise.  
The input section of the SbA750 also allows mono sub  
operation. The stereo signal is fed to the L and R inputs  
and the low-frequency range signals of both channels are  
summed prior to being processed in the power amplifier  
section. All other applications use only the (L)/Mono input.  
Please also refer to the chapter “SETUP EXAMPLES”.  
Parallel Outputs L/R  
Parallel connected to the main inputs these sockets are  
used for “carrying through” the input signals.  
Mid-High Outputs L/R  
The input signal is split via the integrated electronic cross-  
over (PowerMax, 100Hz). Low-frequency signals  
are routed to the internal power amplifier of the SbA750  
while high-frequency signals are present at the Mid-High  
outputs for further distribution to external power amps or  
active mid-high range cabinets.  
Level  
This control sets the output volume of the SbA750 in a  
range between -dB and +10dB. The internal power  
amplifier provides a nominal input sensitivity of +6dBu.  
3
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Status Indicators  
These indicators provide information about the actual operational state of  
the SbA750’s internal power amplifier.  
Signal Indicates that an audio signal is present at the input and that it is  
output.  
Limit When lit this indicator signals that the internal power amplifier actu-  
ally operated at the threshold of clipping. Short-term blinking is not critical,  
because the amp’s audio limiter keeps distortion under control, so that the  
sound is unaffected. Input overdrive, which results in sound degradation, is  
a probable cause for a continuously lit indicator. To prevent this from  
happening, reduce the input level.  
VCP Lights when the power amplifier’s “Voice-Coil-Protection” is activated.  
During dynamic peaks the integrated power amplifier is capable of produc-  
ing output levels that exceed its stated nominal output capacity. Therefore,  
the SbA750 employs a VCP circuit (Voice-Coil-Protection), which simulates  
the thermal behavior of the speaker’s voice-coil, automatically reducing the  
energy fed to the speaker system on the occurrence of thermal overload.  
Protect Lights when one of the multiple comprehensive protections, e.g.  
against thermal overload, HF, DC or Back-EMF of the power amplifier is  
activated. Preventing the woofer from being damaged, it is shutoff via  
relays in the protect mode. Additionally, the input level is being reduced.  
During power-on the PROTECT LED lights for approximately 2 seconds,  
which is normal. This only indicates that all protection circuitry has been  
activated properly.  
Power Switch  
AC switch for switching the SbA750’s power ON or OFF. The switch lights after turning  
the power ON. Make sure that the AC cord is correctly connected if the switch is not lit  
upon turning the power on. If the AC cord is correctly connected and the AC switch does  
not light upon power-on, please contact your local dealer.  
AC Fuse  
During normal operation the AC fuse of the SbA750 only blows at the occurrence of a  
malfunction. Exchanging the fuse is only permissible using a fuse of the same type  
(current, voltage and release characteristic). In case the fuse blows frequently, please  
contact your local dealer.  
AC Connector  
AC connection is established via a PowerCon connector. A 15’ (5m) long AC cord with  
PowerCon plug is supplied.  
CAUTION: THIS APPLIANCE HAS NO USER-SERVICABLE PARTS INSIDE. LEAVE ANY  
SERVICING AND MAINTENANCE QUALIFIED SERVICE TECHNICIANS ONLY.  
Electro-Voice®  
4
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3. Cabling  
LF-Cords  
Using balanced cables with phone or XLR-type plugs for connecting signal sources to the SbA750 is  
strongly recommended to prevent problems caused by noise interference. Make sure to mind the  
pin-assignment as shown below.  
2, SIGNAL +  
XLR MALE  
3, SIGNAL -  
2, SIGNAL +  
3, SIGNAL -  
XLR FEMALE  
SIGNAL -  
SIGNAL +  
SIGNAL +  
The following illustration shows the most important cable connections and their pin-assignment.  
A balanced wiring is to be preferred in each case.  
Standard XLR-Cable  
signal +  
signal -  
Cable connection phone to XLR-type, unbalanced  
signal +  
signal -  
Cable connection phone to XLR-type, balanced  
signal + signal -  
Standard phone-type, unbalanced  
signal +  
signal -  
Standard phone-type, balanced  
signal + signal -  
5
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4. Setup Example A  
Add-On Operation  
The easiest way to expand your power mixer by means of a SbA750.  
Electro-Voice®  
6
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5. Setup Example B  
Stereo 2-way Active Operation with Mono Subwoofer  
In this operation mode only the Mid/High signals are fed to the fullrange speaker cabinets, which allows  
higher acoustic output levels.  
7
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6. Setup Example C  
Stereo 2-way Active Operation with Stereo Subwoofer  
The second SbA750 provides improved SPL in the bass range, in a full Stereo Setup.  
Electro-Voice®  
8
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7. Setup Example D  
Stereo 2-way Active PA-System  
Using two SbA750’s to expand an existing fullrange-system, in a full Stereo Setup.  
9
Electro-Voice®  
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8. Setup Example E  
PA-system withActive Components  
SbA750 in combination with the SxA250, or other active cabinets.  
SxA 250  
SxA 250  
Electro-Voice®  
10  
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9. Specifications  
Freq. Range (-10 dB): 45 Hz - 150 Hz  
Amplifier Design: Hi-Efficiency Class H  
Output Power: 750W (RMS)  
Sensitivity (SPL 1W/1m): 100 dB  
Max Calculated SPL: 128 dB  
Components: EV DL15Y  
Connectors: 2 XLR/Jack Combo Input  
2 XLR Slave Through  
2 XLR Mid-Hi Output  
Level Control: +40 dB to -10 dB  
Internal Crossover: PowerMax 12, 100 Hz  
Cooling: Convection Cooled, Passive  
Protection: Dynamic Limiter, DC, HF High  
Temperature, Peak Current Limiter  
Power Requirements: 100V, 120V, 230V, 240V  
Cabinet: 18mm Baltic Birch Vented Enclosure,  
4 Wheels, Pole Mount (M20), 2  
Handles  
Cabinet Finish: Futura  
Grille: Black Powder-Coated Steel  
Dimensions 23.7" x 16.9" x 22.0"/26.2"  
(H x W x D/D w/Wheels): (603mm x 428mm x 558/665mm)  
Net Weight: 94.7 lbs (43 kg)  
10. Dimensions  
11  
Electro-Voice®  
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11. Block Diagram  
Electro-Voice®  
12  
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U.S.A. and Canada:  
For customer orders, contact the Customer Service department at:  
800/392-3497 Fax: 800/955-6831  
For warranty repair or service information, contact the Service Repair Department at:  
800/685-2606  
For technical assistance, contact Technical Support at:  
866/78-AUDIO  
Specifications subject to change without notice.  
All Other International Locations:  
952-884-4051 Fax: 952-736-4212  
www.electrovoice.com l Telex Communications, Inc. l www.telex.com  
Printed in U.S.A  
© Telex Communications, Inc. 3/2003  
Part Number 38110-235 Rev A  
Electro-Voice®  
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