Electro-Voice SbA750 User manual

Electro-Voice® SbA750 User Manual
SbA750 User Manual

Electro-Voice® SbA750 User Manual
The lightning flash with arrowhead symbol, within an equilateral triangle
is intended to alert the user to the presence of uninsulated dangerous
voltage within the products enclosure that may be of sufficient
magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert
the user to the presence of important operating and maintenance
servicing) instructions in the literature accompanying the appliance.
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water. Do not expose this apparatus to dripping or splashing and ensure that no objects illed
with liquids, such as vases, are placed on this apparatus.
6. Clean only with a dry cloth.
7. Do not block any o the ventilation openings. Install in accordance with the manu acturers instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including ampli iers)
that produce heat.
9. Only use attachments/accessories speci ied by the manu acturer.
10. Re er all servicing to quali ied service personnel. Servicing is required when the apparatus has been damaged in any
way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have allen into the apparatus,
the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
11.To completely disconnect AC power rom this apparatus, the power supply cord must be unplugged.
For US and CANADA only:
Do not de eat the sa ety purpose o the grounding-type plug. A grounding type plug has two blades and a third grounding prong.
The wide blade or the third prong are provided or your sa ety. When the provided plug does not it into your outlet, consult an
electrican or replacement o the absolete outlet.
Important Safety Instructions
CAUTION: These servicing instructions are for use by qualified personnel only. To reduce the risk of electric shock do
not perform any servicing other than that contained in the Operating Instructions unless you are qualified to do so. Refer
all servicing to qualified service personnel.
1. Security regulations as stated in the EN 60065 (VDE 0860 / IEC 65) and the CSA E65 - 94 have to be obeyed when
servicing the appliance.
2. Use o a AC separator trans ormer is mandatory during maintenance while the appliance is opened, needs to be
operated and is connected to the AC.
3. Switch o the power be ore retro itting any extensions, changing the AC voltage or the output voltage.
4. The minimum distance between parts carrying AC voltage and any accessible metal piece (metal enclosure),
respectively between the AC poles has to be 3 mm and needs to be minded at all times.
The minimum distance between parts carrying AC voltage and any switches or breakers that are not connected
to the AC (secondary parts) has to be 6 mm and needs to be minded at all times.
5. Replacing special components that are marked in the circuit diagram using the security symbol (Note) is only permissible
when using original parts.
6. Altering the circuitry without prior consent or advice is not legitimate.
7. Any work security regulations that are applicable at the location where the appliance is being serviced have to be strictly
obeyed. This applies also to any regulations about the work place itsel .
8. All instructions concerning the handling o MOS - circuits have to be observed.
Important Service Instructions

Electro-Voice® SbA750 User Manual
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
arallel Outputs L/R ....................................................................................................................................... 3
Mid-High Outputs L/R .................................................................................................................................... 3
Level .............................................................................................................................................................. 3
Status Indicators ............................................................................................................................................ 4
ower 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
TOC

Electro-Voice® SbA750 User Manual 1
0. Introduction
Congratulations! In buying an Electro-Voice® SbA750 you decided on getting one of todays most ad-
vanced active subwoofers incorporating sop isticated tec nology.
T e active 15" subwoofer SbA750 wit integrated 750 watt power amplifier as been specially designed to
provide fundamental bass support for professional full-range and multi-c annel cabinets. T roug t e
integrated electronic frequency crossover of t e SbA750 setting up an active stereo multi-c annel system
is truly simple. T e stereo audio signals for t e mid- ig range cabinets are provided via t e MID-HIGH
outputs on t e SbA750. Additionally provided are all connection facilities for using t e SbA750 as active
mono subwoofer in active 2-way or add-on operation. Manufactured from baltic birc and ousing a ig -
performance Electro-Voice® DL15Y woofer, t e SbA750 wit stands even t e ardest strain during transport
and operation. W ile input connection is also possible via p one type jacks, all input and output signals are
output via professional XLR-type connectors. T e integrated Hig -Efficiency 750W power amplifier opti-
mally matc es t e DL15Y woofer offering ig est dynamic and audio performance and ensures at t e
same time t at t e DL15Y woofer is always operated in its optimum operation range. Extensive protection
circuitry like VCP, DC/HF-protection, audio limiter, Back-EMF protection and t ermal protection are em-
ployed to securely monitor t e compliance to t ese operation limits guaranteeing t at t e SbA750 provides
outstanding performance even under most demanding conditions. T e SbA750 is also especially suitable
for many rental applications. Compared to Class-AB-operated amps and because of utilizing Class-H Hig -
Efficiency tec nology t e power amplifier produces significantly less power loss, and additionally reduces
t ermal stress of all components. Employing fans to ensure t ermal stability is not necessary because of
t e Class-H tec nology and use of compre ensively dimensioned cooling profiles. T e enclosure is sealed
wit extremely durable Futura coating and a robust powder-coated steel grille provides protection for t e
Electro-Voice® DL15Y woofer against mec anical damage. All controls and t e cooling profiles of t e power
amp module are recessed to provide optimum protection for t e sensitive parts of t e SbA750 even during
transportation. Two carrying andles, four castors and an integrated t readed pole-mount stand flange
allow comfortable transportation and optimum, space saving installation. Because of its versatility, t e
SbA750 can be easily integrated into any existing sound reinforcement installation.
Unpacking and Warranty
Open t e packing and carefully take out t e SbA750. Remove t e protective foil from t e carrying andles.
A power cord and t e warranty card are supplied in addition to t is owners manual. Please make sure t at
all details are filled in on t e warranty card. Only a completely filled in warranty certificate entitles you to
stake any warranty claims. T erefore, keep t e original invoice toget er wit t e warranty certificate at a
safe place.
Setup and Connections
Place t e SbA750 on an even ground if possibly by using t e supplied rubber feet to ensure safe opera-
tion. Make sure to c eck t e stability of t e system w en using pole-mount stands. Do not cover t e eat
sink on t e subwoofers rear during operation. Ot erwise, t e SbA750 will enter protection mode because
of t ermal overload. Alt oug t is provides reliable protection for t e subwoofer, sound reproduction is
muted until t e normal operation mode is regained. AC power is supplied via t e Neutriks professional
PowerCon connector system and by use of an 15 (5m) AC cord. T is ensures an absolute secure and
reliable power supply connection. However, wit large installations consisting of several active cabinets, t e
use of ig -quality AC distributors t at allow ig power consumption and offer reliable protection t roug -
out t e 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 ne t to the AC switch, corresponds to your local
AC voltage.

Electro-Voice® SbA750 User Manual 2
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 e treme
output levels.
T is Quick Start Manual outlines t e set up and operation of a SbA750 used as add-on subwoofer toget er
wit a owermixer (see configuration examples). T e operation procedures are equivalent for ot er
mixers.
1. Set up your Powermixer system as usual and connect a signal source to t e power mixer (e.g. CD
Player or microp one).
2. Place your SbA750 somew ere between your full-range cabinets.
3. Set t e SbA750s LEVEL control to its counterclockwise stop and connect t e unit to a wall outlet using
t e supplied PowerCon mains cord.
4. Use a stereo p one plug cable to connect t e Powermixers MONO OUT to t e SbA750s L/MONO
INPUT.
5. Move t e Mixer MONO OUT fader all t e way down.
6. Be sure to switc on t e Mixer first and t en t e SbA750.
Switc ing on t e SbA750 last is recommended. Ot erwise, unwanted power-on noise mig t occur.
W en switc ing off your equipment, please proceed in t e opposite order, i.e. switc off t e
SbA750 first.
7. Set t e SbA750s LEVEL control to its center position (0dB) and start t e playback of t e desired signal
audio source.
8. After adjusting t e desired acoustic output level of t e full-range cabinets using t e Powermixers master
fader, establis volume setting for t e subwoofer using t e MONO OUT fader.

Electro-Voice® SbA750 User Manual 3
Input L/Mono, Input R
Electronically balanced inputs for t e connection of ig -
level signal sources suc as mixers, signal
processors, etc. Establis ing t e connection is possible via
p one 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.
T e input section of t e SbA750 also allows mono sub
operation. T e stereo signal is fed to t e L and R inputs
and t e low-frequency range signals of bot c annels are
summed prior to being processed in t e power amplifier
section. All ot er applications use only t e (L)/Mono input.
Please also refer to t e c apter SETUP EXAMPLES.
2. Controls
Level
T is control sets t e output volume of t e SbA750 in a
range between -∞dB and +10dB. T e internal power
amplifier provides a nominal input sensitivity of +6dBu.
arallel Outputs L/R
Parallel connected to t e main inputs t ese sockets are
used for carrying t roug  t e input signals.
Mid-High Outputs L/R
T e input signal is split via t e integrated electronic cross-
over (PowerMax, 100Hz). Low-frequency signals
are routed to t e internal power amplifier of t e SbA750
w ile ig -frequency signals are present at t e Mid-Hig
outputs for furt er distribution to external power amps or
active mid- ig range cabinets.

Electro-Voice® SbA750 User Manual 4
Status Indicators
T ese indicators provide information about t e actual operational state of
t e SbA750s internal power amplifier.
Signal Indicates t at an audio signal is present at t e input and t at it is
output.
Limit W en lit t is indicator signals t at t e internal power amplifier actu-
ally operated at t e t res old of clipping. S ort-term blinking is not critical,
because t e amps audio limiter keeps distortion under control, so t at t e
sound is unaffected. Input overdrive, w ic results in sound degradation, is
a probable cause for a continuously lit indicator. To prevent t is from
appening, reduce t e input level.
VC Lig ts w en t e power amplifiers Voice-Coil-Protection is activated.
During dynamic peaks t e integrated power amplifier is capable of produc-
ing output levels t at exceed its stated nominal output capacity. T erefore,
t e SbA750 employs a VCP circuit (Voice-Coil-Protection), w ic simulates
t e t ermal be avior of t e speakers voice-coil, automatically reducing t e
energy fed to t e speaker system on t e occurrence of t ermal overload.
rotect Lig ts w en one of t e multiple compre ensive protections, e.g.
against t ermal overload, HF, DC or Back-EMF of t e power amplifier is
activated. Preventing t e woofer from being damaged, it is s utoff via
relays in t e protect mode. Additionally, t e input level is being reduced.
During power-on t e PROTECT LED lig ts for approximately 2 seconds,
w ic is normal. T is only indicates t at all protection circuitry as been
activated properly.
ower Switch
AC switc for switc ing t e SbA750s power ON or OFF. T e switc lig ts after turning
t e power ON. Make sure t at t e AC cord is correctly connected if t e switc is not lit
upon turning t e power on. If t e AC cord is correctly connected and t e AC switc does
not lig t upon power-on, please contact your local dealer.
AC Fuse
During normal operation t e AC fuse of t e SbA750 only blows at t e occurrence of a
malfunction. Exc anging t e fuse is only permissible using a fuse of t e same type
(current, voltage and release c aracteristic). In case t e fuse blows frequently, please
contact your local dealer.
AC Connector
AC connection is establis ed via a PowerCon connector. A 15 (5m) long AC cord wit
PowerCon plug is supplied.
CAUTION: THIS APPLIANCE HAS NO USER-SERVICABLE PARTS INSIDE. LEAVE ANY
SERVICING AND MAINTENANCE QUALIFIED SERVICE TECHNICIANS ONLY.

Electro-Voice® SbA750 User Manual 5
3. Cabling
LF-Cords
Using balanced cables wit p one or XLR-type plugs for connecting signal sources to t e SbA750 is
strongly recommended to prevent problems caused by noise interference. Make sure to mind t e
pin-assignment as s own below.
XLR MALE XLR FEMALE
2, SIGNAL +
3, SIGNAL - 2, SIGNAL +3, SIGNAL -
SIGNAL -
SIGNAL +
SIGNAL +
Standard XLR-Cable
Cable connection phone to XLR-type, unbalanced
Cable connection phone to XLR-type, balanced
Standard phone-type, unbalanced
Standard phone-type, balanced
signal +
signal -
signal +
signal -
signal + signal -
signal +
signal -
signal + signal -
T e following illustration s ows t e most important cable connections and t eir pin-assignment.
A balanced wiring is to be preferred in eac case.

Electro-Voice® SbA750 User Manual 6
. Setup Example A
Add-On Operation
T e easiest way to expand your power mixer by means of a SbA750.

Electro-Voice® SbA750 User Manual 7
5. Setup Example B
Stereo 2-way Active Operation with Mono Subwoofer
In t is operation mode only t e Mid/Hig signals are fed to t e fullrange speaker cabinets, w ic allows
ig er acoustic output levels.

Electro-Voice® SbA750 User Manual 8
6. Setup Example C
Stereo 2-way Active Operation with Stereo Subwoofer
T e second SbA750 provides improved SPL in t e bass range, in a full Stereo Setup.

Electro-Voice® SbA750 User Manual 9
7. Setup Example D
Stereo 2-way Active A-System
Using two SbA750s to expand an existing fullrange-system, in a full Stereo Setup.

Electro-Voice® SbA750 User Manual 10
8. Setup Example E
A-system with Active Components
SbA750 in combination wit t e SxA250, or ot er active cabinets.
SxA 250
SxA 250

Electro-Voice® SbA750 User Manual 11
9. Specifications
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10. Dimensions

Electro-Voice® SbA750 User Manual 12
11. Block Diagram

Electro-Voice® SbA750 User Manual
U.S.A. and Canada:
For customer orders, contact t e Customer Service department at:
800/392-3497 Fax: [phone]
For warranty repair or service information, contact t e Service Repair Department at:
800/685-2606
For tec nical assistance, contact Tec nical Support at:
866/78-AUDIO
Specifications subject to c ange wit out notice.
All Ot er International Locations:
952-884-4051 Fax: [phone]
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