IVIE MPS 2300 User manual

1605 NW State Street
Lehi, Utah 84043
[phone]
FAX: [phone]
Interenet: www.ivie.com
Operation and Owners Manual for the
Printed in U.S.A.

lvie Technologies
MPS 2300
MUSIC AND PAGING SYSTEM
Table of Contents
Section One...Introduction
1-1
Welcome
Warranty
1-2 Overview and Description
Section Two....Basic Instructions
2-1 Unpacking and Inspection
Important Installation Precautions
2-2 Front Panel Controls and Indicators
2-2 Power Switch
Master Volumes A
& B
2-3 Master Treble and Bass Controls
Music Source Selector
Music Volume
2-4 Music Input Signal Presence and Assignment Indicators
Paging Volumes
Mic Input Signal Presence and Assignment Indicators
Mono/Stereo Linking Switch (located on bottom)
2-4 Rear Panel Controls and Features
2-4 Paging Section
Mic Gain Control
Mic AGC
Voice EQ
Mic Input Sensitivity Switch
Active Balanced Mic Input
Mic/Zone Keys
2-5 Music Section
Music Gain Control
Music Treble and Bass EQ Controls
Input Sensitivity Switches
Unbalanced Music Inputs
Active Balanced Inputs
Pre-Amp Out/Power Amp In
Muting Trims
2-6 AUX Inputs and Gain Controls
Remote Control Terminals
Power Amplifier Section
Clip Indicator
2-7 PowerLimit Control
Speaker Impedance Switch
Power Amp Output Terminals
Power Amp Active Balanced Inputs
2-8 Switched AC Outlet
Switched +/- 15V Power Supply Taps
2-9 Basic Set-up Instructions

2-10
2-11
2-12
2-14
2-17
AC Power
Chassis Ground
Speaker Connections
Paging Connections
Paging Inputs
Balanced Sources
Unbalanced Sources
Zone Keying
Paging Mic/Line Switch
Mic Gain Control (See Gain Staging)
Music Connections
Unbalanced Inputs
Balanced Inputs
Summing Stereo Pairs
Music Adjustments
AUX Inputs
Gain Staging
Control Range
Gain Staging Adjustments
Gain Staging the Paging Levels
2-13 Gain Staging the Music Levels
Gain Staging with Remote Control.
AUX Level
Music Muting Trims
PowerLimit Control
Limiting Overall Level
2-15 Protecting Speakers from Excess Power
2-l 6 Preventing Output Clipping
25 Volt Systems
Pre-Out/Amp In
Insertion of signal processing
2-17 Routing of signal to other amplifiers
Amplifier Active Balanced Inputs
Using Amplifier Active Balanced Inputs
Inserting Signal Processing
Mixing with Active Balanced Inputs
Switched AC Outlet
+/-15V Power Supply Taps
Section Three....Installation and Set-up
3-1 Shelf Mounting
Rack Mounting
Front Panel Set-up
Knob Lock-out Plug
Site Specific Labels
3-2
Music Source Selector Knob Rotation Limit
Remote Control
Hook-up
Set-up
3-3
Operation
Building Your Own Remote Control Panel
Stereo Operation

3-4 Set-up
Operation
Stereo Remote Hook-up
3-5 Stereo Remote Set-up
Quasi-balanced Lines
Section Four....Operational Trouble Shooting
4-1 No Sound
Very Faint Sound
4-2 Page but No Music
Music but No Page
Weak but Clear Sound
4-3 Weak and Distorted Sound
Sound Cuts In and Out
Sound has Bad Tone
Lacks Power
Unwanted Noise
Hum
Buzz
4-4 Hiss
Crackles
Radio Interference
Section Five....Maintenance and Service
5-1 Cleaning
Dust Removal
User Maintenance
Obtaining Service
Section Six...Schematics and Drawings
6-1 Specifications
Flow Chart
Schematics
Remote Schematic
Rear Panel Knob and Switch Setting Drawing/Log
Front Panel Knob Setting Drawing/Log

lvie Technologies
MPS 2300
Introduction
Thank you for selecting an Ivie product for your audio
system. Our goal is to be sure you remain happy with your
choice for many years to come. Please do not hesitate to
call the lvie customer service department if you have any
service problem or questions not answered in this manual.
Welcome.
Your lvie MPS 2300 can be readily operated by anyone.
However, we recommend that you use a qualified audio
professional to install and set-up the system. In this
manner, you will be assured of achieving optimum system
performance.
--
Please consult the Table of Contents for fast guidance to
the sections of interest. We recommend that all users read
Section Two, Front Panel Controls and Indicators. This will
provide operating information on the user front panel
controls. For individuals installing this product we urge you to
read the entire manual. Set-up instructions are contained
in Section Two, Basic Set-up Instructions. All users should
read Section Two, Unpacking and Inspection, and
important Precautions.
lvie Technologies warrantees all Series Two products to
be free from defective material and/or workmanship for a
period of three years from date of sale. lvie will replace
defective parts and repair malfunctioning products under
this warranty when the defect occurs under normal
installation and use, provided the unit is returned to our
factory via prepaid transportation. This warranty provides that
examination of the returned product must disclose, in our
judgement, a manufacturing defect. This warranty does not
extend to any product which has been subject to misuse,
neglect, accident, improper installation, or where the serial
number has been removed or defaced. Manufacturer shall
not be liable for consequential damages resulting from
defects in materials and/or workmanship.

Introduction
lvie Technologies
MPS 2300
Overview and
Description. The MPS 2300 Music + Paging System is an integrated 8- channel, 2-zone or stereo 1 -zone mixer amplifier designed
specifically for music and paging applications. The
numerous features incorporated to improve performance,
ease installation and simplify use include:
l Switch selectable music source selection
l LED input signal and routing indicators
l AGC on mic channels maintain consistent page
levels
l Adjustable muting trims set the exact amount of
muting desired
l PowerLimit controls set maximum level, prevent
clipping and protect speakers
l Remote control Source Select, Page and Music
volume
l Switchable channel input sensitivity
l Gain, Treble, and Bass controls on music channels
to match sources
l Active balanced inputs on Mic channels and Music
channels 1 and 2
l Pre-out/Amp-in patch points and separate Aux inputs
for each zone
l Direct 8 ohm/70V outputs improve damping and
lower distortion
l Mono/Stereo linking switch
l +/- 15V power supply taps to power outboard signal
processing
l Switched AC accessory outlet
l Delayed Turn-on/off and DC Fault speaker
protection
The mixer/[re=amp has 2-Mic, 4-Music and 2-Aux input
channels and two Zone outputs. Except for the Aux inputs,
any channel may be routed to either or both Zones. Mic
channels are keyed; grounding the appropriate terminal(s)
activates the mic, routes it to the correct zone(s) and
triggers the music muting circuit. Mic channels have AGC
and EQ tailored to provide high intelligibility. Music
channels are switched by front panel or remote selectors.
Music channels have Gain, Treble and Bass controls.
Separate AUX channels are provided for each Zone. Front
panel controls adjust Page, Music and Master levels for

Ivie Technologies
MPS 2300
Introduction
each Zone. LEDs monitor input signals and routing to each
Zone while level meters monitor the output.
Zone A and Zone B each have a 150 watt power amplifier
to drive
25-35V, 4-8 ohm loads or 70V lines. The direct-
output circuit significantly improves damping while lowering
distortion and is protected from shorts, mis-matched loads,
and thermal over-temp.
Speakers are protected from DC
fault and the PowerLimit circuit prevents clipping, protects
speakers from excess power, and/or limits overall level to a
preset maximum.
The MPS 2300 is designed to provide years of trouble free
performance. Quality components and contemporary high
performance circuits assure optimum performance and
long-term reliability. A three year limited parts and labor
warranty is among the longest in the industry.

lvie Technologies
MPS 2300
Basic
Instructions
l Check for carton damage while unpacking.
Unpacking and
Inspection.
l Check the product for loose or rattling parts.
l Save the carton for return shipment, if required.
l If shipping damage is evident, notify the transpor-
tation company immediately. File a claim with the carrier
for shipping damage. Be sure to save the carton for the
Shipper to inspect.
l Keep power OFF when making any connections. Important
Installation
Precautions.
l Check the AC voltage before connecting the AC
plug. CONNECTION TO WRONG VOLTAGE WILL IM-
MEDIATELY DAMAGE THE PRODUCT, and voids the
warranty.
l Start with the Master Volume controls all the
way off. Turn the controls up gradually until normal
operation is verified.
l Never connect speaker barriers from different
channels together or the same speaker to more
than one channel.
l Do not connect speaker barriers to chassis or
signal ground.
l Keep speaker wiring separate from input wiring.
l Always connect speakers with power off. Use
heavy gauge cable with no frayed strands or
damaged insulation.
l Failure to observe precautions could lead to fire
or shock hazard. Never plug in a damaged amplifier
until the condition of the internal insulation is checked. If
the internal fuse blows the amplifier section is defective
and must be repaired or replaced.
l Be sure to provide adequate support and
ventilation.

Basic
Instructions
lvie Technologies
MPS 2300
Safety Warning.
DANGEROUS VOLTAGE INSIDE. Do not remove
the cover or expose to rain or moisture. Refer all
servicing to qualified personnel. Warranty may be
void if the product is repaired or tampered with by
non-lvie repair personnel. Please call the factory
for service information and locations.
Front Panel Controls
and Indicators.
MUSIC + PAGING SYSTEM MASTER CONTROLS
r
1 r
I
TREBLE TREBLE
BASS BASS
POWER
0MASTER. VOLUME MASTER volume
. .
. .
.
nA
0’
0.
.
10 10
ON/OFF ZONE AZONE B
Power Switch. Power Switch controls entire unit including outlet and
+/- 15V power supply taps.
Master Volumes A
& B Master Volumes A
& B are the gain controls for each power
amp. The nominal position for full output is all the way up.
A center detent marks the -6 dB gain position.

Basic
Instructions
lvie Technologies
MPS 2300
+6 dB fully clockwise. A remote fader can be used on each
control to provide up to 30 dB of attenuation.
Music Input Signal
Presence and
Assignment Indicators
Page Volumes.
Mic Input Signal
Presence and
Assignment Indicators
Mono/Stereo Linking
Switch.
Rear Panel Controls
and Features.
Paging Section.
Mic Gain Controls.
Mic AGC.
Voice EQ.
Music input Signal Presence and Assignment Indicators
monitor performance and operation and simplify set-up and
trouble shooting. Yellow signal presence LEDs monitor
each of the four Music channels. The indicators flicker in
proportion to the signal present at the input. A set of green
LEDs indicate assignment of an input to either or both
Zones.
Page Volumes are microphone sub-masters for each zone.
A center detent marks the nominal level position, with +6 dB
fully clockwise. A remote fader can be used on each
control to provide up to 30 dB of attenuation.
Mic Input Signal Presence and Assignment Indicators
monitor performance and operation and simplify set-up and
trouble shooting. Yellow signal presence LEDs monitor
each of the two Mic channels. The indicators flicker in
proportion to the signal present at the input. A set of green
LEDs indicate assignment of an input to either or both
Zones.
Mono/Stereo Linking Switch (located behind front panel)
converts the system from mono 2-zone to stereo 1-zone.
The stereo position links input pairs (left and right) to music
selector A and defeats selector B.
Mic Gain Controls set and match levels of mics. A center
reference detent marks a nominal gain position with 20 dB
of additional gain fully Clockwise.
Mic AGC (Internal) maintains a consistent level and
compensates for excessive microphone proximity effect
while helping prevent overload.
Voice EQ maximizes intelligibility while minimizing
problems with feedback. Peak/cut type cuts at 1 KHz and
boosts at 3 KHz with frequency extremes rolled off. A
center detent marks the flat position.

Ivie Technologies
MPS 2300
Basic
Instructions
Mic Input Sensitivity Switch selects mic or line input
sensitivity.
Active Balanced Mic Inputs provide hum and noise
rejection, low distortion and controlled frequency response.
Barrier strips provide long term gas-tight connections.
Barriers may be jumpered to provide unbalanced input.
Inputs are protected from excess voltage and levels.
Mic/Zone Keys grounding the terminal opens the mic and
routes it to the selected zone(s). The mic may be hard wired
on by jumping the barrier.
Music Gain Control set and match levels of different types
of sources. A center detent marks a nominal gain position
with 20 dB of additional gain fully clockwise.
Music Gain Control.
Treble and Bass EQ Controls are tailored for music sources
with
10 dB of boost or cut at 100 Hz and 10 KHz. Center
detents mark the flat position.
Treble and Bass EQ
Controls.
Input Sensitivity Switches select 0.1 V or 1 V input levels to Input Sensitivity
accept a wide variety of music sources. Switches.
Unbalanced Music Inputs with phono connectors are
provided for each music channel. Unbalanced Music Inputs.
Active Balanced Inputs with barrier connectors on music
channels 1 and 2 are provided for maximum performance
when long cable runs are required.
Active Balanced
Inputs.
Pre-Amp Out/Power Amp In insertion point for signal
processing or routing of signal to external equipment.
Unbalanced signal is pre-master volume, post-page and
music volumes.
Muting Trims for each zone are adjustable between 0 and
-
30 dB, and have a quick, popless mute followed by a slow
return to normal level.
Mic Input Sensitivity
Switch.
Active Balanced Mic
Inputs.
Mic/Zone Keys.
Music Section.
Pre-Amp Out/Power
Amp In.
Muting Trims.

Ivie Technologies
MPS 2300
Basic
Instructions
These instructions cover normal use of the MPS 2300 in
two-zone applications. See Section Three for installation
instructions and stereo one-zone operation.
Connect AC cord to standard
120V, 60Hz, three conductor
(grounded) outlet only. The amplifier will operate
satisfactorily from
100-130V, but full rated performance will
be met only at
120V.
There is a provision for lifting signal ground relative to
chassis ground. For safety reasons do not remove
the ground pin on the AC cord. Electronic balanced
inputs are provided for hum rejection, if needed. Use
balanced input cables and ground lift strap if necessary to
avoid hum and interference.
Speaker connections must be made in conjunction with
setting the speaker voltage switch. See diagram for proper
hook-up. Make certain power is off during hook-up. Do not
change switch setting after speaker hook-up.
Switching output voltage with power on could cause
speaker failure.
Basic Set-Up
Instructions.
AC power.
Chassis Ground.
Speaker Connections.
70V
4-8 ohms
25-35V, 4-8 Ohm
rs
70V
70V
++
4-8 OHM 4-8 OHM

Basic
lvie Technologies
MPS 2300
Instructions
unbalanced line, do not use the mic shield as the
ground connection for Zone Keys (see below).
Active electronic switching connects the mic channel to the
output Zone(s) only during actual paging. This blocks noise
and interference between pages, as well as activating the
Music Muting. To page the desired Zone, ground the
appropriate Key terminal on the barrier strip by using a
switch in the mic or an external switch at the paging
location. Wire Zone A and B keys together to page both
Zones, or use a split paging switch to selectively page
either or both Zones. Music will mute only in the Zones
being paged. A Zone Key can be wired to ground to keep
the mic permanently open, losing the ability to mute music
while paging. In this case, any noise or interference at the
paging input can be passed to the output between pages.
Zone Keying.
Most mics will use the high gain “Mic” position. Telephone
sources and amplified mics may use the “Line” position.
For telephone hook-up, see Section 3.
Paging Mic/Line
Switch.
Mic Gain Control. See Gain Staging (below). Mic Gain Control.
All Music Inputs have phono plugs for unbalanced sources.
Music Inputs 1 and 2 have barrier strip balanced inputs.
Start with Channel 1 and work across to prevent skipped
positions on the selector.
Music Connections.
Use the phono jacks, or connect to the +Input of the
barrier strip (Music Input 1 or 2 only), leaving the
shorting link in place between Gnd
and -Input.
Unbalanced Inputs.
Remove the shorting link to the -Input and connect
the balanced pair to +Input and -Input. Balanced Inputs (Music Inputs 1 and 2
Only).
Sum a stereo source into Music Input 1 or 2 by
connecting one channel to the phono plug and the
other channel to the +Input of the barrier strip. Keep
the shorting link from Gnd to -Input. Summing occurs
in-phase through matched 1 OK resistors.
Summing Stereo
Pairs.

Basic
Instructions
lvie Technologies
MPS 2300
Music Adjustments. Set the 0.1 V-l V Sensitivity Switch so the Music Gain
control operates in a comfortable range (see Gain Staging,
below). The Treble and Bass controls are flat on the center
detent and have typical home-stereo response curves to
match tone quality for each source.
Aux Inputs.
Gain Staging.
Control Range.
Gain Staging
Adjustments.
Gain Staging the
Paging Levels.
An unbalanced barrier-strip input with Gain control for each
Zone bypasses all front controls except the Master controls
for each Zone’s power amp. Useful for alarm messages,
chimes, masking or outboard mixes which should not be
affected by Music or Paging.
There are two general approaches to setting the controls on
the front panel. One is to set the Music Volume and Paging
Volumes to control the relative loudness of the music and
paging, and let the user adjust the Master Volume for each
zone. The other is to pre-set the Master Volumes for each
zone and let the user adjust the Music and Paging
separately. Pre-set controls can be locked out and "site-
specific” labels used to clearly identify the remaining
controls. The installer’s goal is to pre-set the rear panel and
locked-out front panel controls so that the remaining
controls operate over a well-controlled range, with the
center detent being “nominal”. Since there are three
controls affecting the gain of any signal (two front-panel,
and one rear-panel control), it is essential to adopt an
organized approach to Gain Staging.
Front-panel Volume controls are -6 dB on the center
detent providing limited “boost” above
and unlimited
volume reduction below the detent.
Determine which controls will be user-adjustable, and
set these on the center detent. Adjust the remaining
front
and back panel controls to obtain the desired
levels. Start by establishing the paging level, as noted
below.
The peak level of the paging signal is controlled by
the AGC circuit and can serve as an anchor around
which to set the other levels. The AGC circuitry is
designed so that the threshold of power amp clipping
is reached when Paging Volume and Master Volume
are full-up for a given Zone. For “normal” full power
paging with a few dB of headroom,
either the Master Volume or the

Ivie Technologies
MPS 2300
Basic
Instructions
Paging Volume (but not both) may be reduced to the
center detent. This would normally be the case with a
70V system where speaker taps have been accurately
set for desired SPL. When Paging is desired at
reduced level, the control to be locked-out can be
reduced as necessary. Use the Mic Gain and Voice
EQ on the rear panel to ensure adequate Paging
Volume without feedback. The objective is to keep the
front-panel user control on the detent. Adjust the
remaining control(s) for desired level and then check
the full range of the user control for acceptable
behavior.
Once the nominal page level is set, the Music Volume
(or Master Volume) for that zone can now be
detented. Use Music Volume and Music Input controls
to obtain the desired music level and EQ. Music
Muting may now be set (Section Two, Music Muting
Trims).
Gain Staging the
Music Levels.
Remote Faders only decrease volume from the levels
established by each Zone’s Music Volume and
Paging Volume controls. Set these controls for the
maximum desired volume. The user will then have
Remote volume control over a 30 dB range. Check
Remote Fader positions if gain seems low or
premature clipping (loss of headroom) occurs during
Gain Staging.
Gain Staging with
Remote Control.
The only front-panel controls which affect the Aux
Level are the Master Volume and Master EQ's. Set
these controls in the desired position as determined
above and then adjust the rear-panel Aux Gain for the
desired Aux level.
Aux Level.
Muting adjustment is separate for each zone, and ranges
from 0 dB (no muting) to -30 dB. Make adjustments after
completing music and page set-up. If using a remote Music
Fader adjust after making connection since it affects the
Muting Trim taper. To adjust:
Music Muting Trims.
1. Rotate Muting Trim control fully counter-clockwise
(out).