Galaxy Audio Core PA8X140 User manual

OWNER’S MANUAL
1999GalaxyAudio,Inc.
©
GALAXY AUDIO
™
®
CORE PA8X140

This symbol indicates that there are important operating and maintenance instructions in the literature
accompanyingthisunit.
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WARNING! TOPREVENTTHERISKOFFIREORELECTRICSHOCK,DONOTEXPOSETHISAPPLIANCETO
RAINORMOISTURE.TOPREVENT THERISKOF ELECTRICALSHOCK,DONOTREMOVECOVER. NOUSER
SERVICEABLEPARTSINSIDE.REFERSERVICINGTOQUALIFIEDSERVICEPERSONNEL.
GENERAL GUIDELINES FOR OPERATING THE CORE PA8X140
DO NOT . . .
nExposethe COREPA8X140 torain ormoisture.
nPlug-in or unplug patch cords while the power is on.
nAttempt to make any repairs to the CORE PA8X140.
DO . . .
nHandlewithcare.
nReadthismanual.
nCompletetheregistrationcard.

1
CORE PA8X140 FRONT PANEL ------------------------------------------------------------------------------- 2
APPLICATIONS ------------------------------------------------------------------------------------------------------ 3
WIRELESS MICROPHONE CONNECTION------------------------------------------------------------------ 3
SOUND REINFORCEMENT BASICS-------------------------------------------------------------------------- 4
Avoiding Feedback -------------------------------------------------------------------------------------------- 4
Monitor Placement --------------------------------------------------------------------------------------------- 4
MaximizingGain ------------------------------------------------------------------------------------------------ 5
CORE PA8X140 SPECIFICATIONS---------------------------------------------------------------------------- 6
WARRANTY----------------------------------------------------------------------------------------------------------- 7
BLOCK DIAGRAM--------------------------------------------------------------------------------------------------- 9
TABLE OF CONTENTS

FRONT PFRONT P
FRONT PFRONT P
FRONT PANELANEL
ANELANEL
ANEL
®
CORE PA8X140
LIMITLED
Indicates when the built-in compression circuit is activated. By
automatically reducing gain before clipping occurs the compression
circuit
prevents distortion. The LIMIT LED remains lit about half the
time when the amplifier is being driven to its maximum potential. Do
not allow it to remain lit more than half the time.
MIC(XLR)INPUT
Balanced input with 24 VDC phantom
power for electret microphones.
TONECONTROLS
When all three controls are set to the
12 o’clock (detent) position, the
output frequency response is flat.
HIGH +/- 12dB peak/dip at 16 kHz.
MID +/- 12dB peak/dip at 2 kHz,
LOW +/- 15dB peak/dip at 100 Hz
¼”INPUT
LEVELCONTROLS
SmartALIC (All Level Input Control) adjusts the gain for differences between line
and mic signals. This allows almost any input signal to be used while maximiz-
ing the signal-to-noise ratio at the desired output level.
LINE LEVEL (7 o’clock to 12 o’clock) for tape decks, CD players. etc..
MIC LEVEL (12 o’clock to 5 o’clock) for mics and instruments.
POWERSWITCH
LEVELCONTROLFOR¼”INPUT
LEVELCONTROLFORMIC(XLR)INPUT
2
POWERLED

APPLICAPPLIC
APPLICAPPLIC
APPLICAA
AA
ATIONSTIONS
TIONSTIONS
TIONS
SmartALIC all level gain control compensates for differences between the input levels of microphones, instruments and
other devices. It enables the CORE PA8X140 to function equally well as a monitor, guitar amp, one-piece PA system, or
keyboardamp. Balanced XLR and ¼-inch TRSinputs havetheir ownlevel controls. Simplyplug into the appropriate jack
andposition thePA8X140 foryour particularapplication.
STAGEMONITOR
nSmallfootprintandcompactsizemakethePA8X140anunobtrusiveon-stagecompanion
nGalaxy’sproprietaryfive-inchdriver,mountedinthePA8X140’stiltablehead,providessuperior
intelligibilityofthe humanvoice,whetherspeaking orsinging
GUITARAMPLIFIER
nFive-inchdriverprovidessuperfastattack
nHead tilts to optimize directivity of mid and high frequencies
n146 watts of power and 98 dB sensitivity combine to achieve 114 dB SPL (very loud)
nBuilt-in compressor/limiter maximizes sustain
FULLYPORTABLEWIRELESSPASYSTEM(WithGalaxyAudio’sFAROUTLET)
n12Vpowersupplyforwirelessreceiver
nGalaxy’sproprietaryfive-inchdriver,mountedinthePA8X140’stiltablehead,providessuperior
intelligibilityofthe humanvoice,whetherspeaking orsinging
nCoverscrowdsof1,500ormore
nClassHampmeansFAROUTLET retainscharge longer
nHead tilts to optimize directivity of mid and high frequencies
KEYBOARDAMPLIFIER
nSpeciallydesignedacousticsuspensionchamberwith eight inchwoofer handlesfrequencies
down to 20 Hz unlike conventional bass reflex (ported) speakers which can distort synthesizers’
lowernotes.
nAcoustic suspension design produces nice “tight”sound
nHead tilts to optimize directivity of mid and high frequencies
3

4
WIRELESS MICROPHONE CONNECTIONWIRELESS MICROPHONE CONNECTION
WIRELESS MICROPHONE CONNECTIONWIRELESS MICROPHONE CONNECTION
WIRELESS MICROPHONE CONNECTION
It is not necessary to remove the head to connect a
wireless receiver. This exploded view is provided for
clarity. The mic cable may be routed under the head.
Velcro not included.

SOUND REINFORCEMENT BASICSSOUND REINFORCEMENT BASICS
SOUND REINFORCEMENT BASICSSOUND REINFORCEMENT BASICS
SOUND REINFORCEMENT BASICS
AVOIDING FEEDBACK
Feedback (the shriek sometimes emitted by sound systems) occurs when the microphone (or pickup) and speaker are posi-
tioned too close together for a given level of volume. Once feedback occurs, it will continue until either the volume is de-
creased or the microphone or speaker is moved. Gain is the degree to which the volume may be turned up before feed-
back begins. In setting up a sound system, the object is to maximize the gain.
nIn most cases, the (main) speakers should be placed on stands, at a height slightly above the heads of the
audience, in front and to each side of the stage.
nThey should be rotated inward, but only slightly. More than a few degrees of rotation can reduce the gain.
nPowering monitor speakers with the same channel of the amplifier used to power main speakers may cause
feedback.
nIdeally, monitor speakers should either have their own volume controls or be routed through a separate channel of the
amplifier so the volume of one speaker system can be adjusted without affecting the other.
nMost mixers provide separate controls for the mains and monitors. Separate monitor outputs make it possible to tailor
the monitor mix and the levels, independent of the mains.
nThePA8X140’stonecontrolsprovideonemeansofcontrollingfeedback. Begin with the MID and HIGH controls
set at 12 o’clock, and LOW at 10 o’clock. Gradually increase the volume until it reaches the point immediately before
feedback (the speaker should ring slightly). Turn the MID control to 10 o’clock. If the ringing stops, leave the MID
control in that position. If the ringing persists, return the MID control to 12 o’clock. Turn the HIGH control to 10
o’clock. If the ringing stops, leave the HIGH control in that position. If it persists, return the HIGH control to 12 o’clock
and repeat the process, turning the MID and HIGH controls to 9 o’clock and the LOW control to 7 o’clock. Periodically
talk through the system, while repeating this process, until several notes ringing at once or sound quality is noticeably
reduced.
nIn high volume applications, reduce all the LOW frequencies. Low frequencies are omnidirectional and can be heard
equally well anywhere on stage. They are not needed in the monitor mix.
nTheCORE PA8X140automaticallyprovidesaflatfrequencyresponsewheneverthetonecontrolsaresettotheir
center-detentpositions.
nUsea unidirectional microphone. Sincethereare manybrands, withwidevariance intheir amounts ofrejection (the
abilityto not pick up peripheral sounds), experimentation provides the best means of choosing the right microphone.
MONITOR PLACEMENT
nThe CORE PA8X140 should be positioned as near to the performer as is practical. The closer it is, the louder it is.
nTheCOREPA8X140shouldbe placedtotherearofthe microphonebeing usedbytheperformer.
nIf, in a system with multiple monitors, one monitor is substantially nearer a vocal microphone than are the other
monitors in the system, its volume may need to be reduced to avoid limiting the gain of the entire monitor system.
5

Figure 1.1
MAXIMIZINGGAIN
Figure 1.1 represents the worst possible case of gain limiting; the microphone is pointed directly at the speaker. Any in-
crease in volume will instantly produce feedback. As little as 1/1000 of the amplifier’s power may be available; with a 100 watt
amplifier, that’s only 1/10 of a watt. In Figure 1.2 , the distance between the microphone and the speaker has increased to 500
feet, allowing 100 percent gain (all 100 watts of power may be utilized without producing feedback). Of course, these are ex-
tremes, but they illustrate the importance of speaker and microphone placement in determining the gain of the system. In
most cases it’s not possible to locate the microphone 500 feet from the speakers. The challenge is to position the speakers
toadequately cover the listening areawhile positioningthe microphoneto maximizethe gain.
6
Figure1.2
500Feet

7
AMPLIFIERSECTION
Power Output: 146 watts @ 4 ohms
Distortion: <0.1% THD @ 4 ohms
Minimum Recommended Load Impedance: 4 ohms
Frequency response: 40 Hz–20 kHz
Equalization: Three band center detent
Lo: ± 15 dB peak/dip at 100 Hz
Mid: ± 12 dB peak/dip at 2 kHz
Hi: ± 12 dB peak/dip at 16 kHz
Input connections (each with individual volume control)
One ¼-inch, balanced (18 k ohms differential,
9 k ohms unbalanced)
One XLR, balanced, with +24 VDC phantom power
(2.6 k ohms differential)
Output connections:
One (post-EQ, post-level) RCA line out
One (5.5 mm O.D./2.1 mm I.D.) barrel 12VDC @ 500 mA with
12”cable attached (for wireless receiver)
Damping Factor: >380
SPEAKERSECTION
Speaker Complement: One Galaxy Audio S5C160-8 ferro fluid cooled
5-inch driver with 40 oz. (1.1kg) magnet structure;
One 8-inch woofer, with 96 oz. (2.7kg) magnet structure, 2 inch voice coil
Nominal impedance: 4 ohms
Power handling capacity: 150 watts @ 4 ohms
Sensitivity (1 Watt @ 1 meter): 98 dB (1 kHz octave band)
Frequency response: 40 Hz–18 kHz
Maximum SPL @ clip (100 Watts @ 1 meter): 114 dB
SPLOWT: 4.07 (SPL ÷weight)
Enclosure Materials: Wood composite cabinet with polyurea finish and
cloth covered Noryl grille
Color: Black cabinet and grille
Dimensions: 20.6" x 12" x 9" (523 mm x 305 mm x 229 mm)
Net weight: 28 lbs. (12.7 kg)
Shipping weight: 31 lbs. (6.1 kg)
SPECIFICSPECIFIC
SPECIFICSPECIFIC
SPECIFICAA
AA
ATIONSTIONS
TIONSTIONS
TIONS
BUILT-INCOMPRESSOR/LIMITER
Built-in compressor/limiter circuitry controls
the amplifier’s gain, acting like a compressor
on transient signals and a “brick wall”limiter
on signals that continuously exceed a prede-
termined limit. The result is an apparent 6 dB
increase in SPL without distortion.
CLASSHAMPLIFIER
TheClass Hpower supply configuration
utilizesfour output transistors, a lowvoltage
pairand ahigh voltagepair. The lowvoltage
transistors are active with any signal. When
demandon theamp exceedsthe lowvoltage
transistors’capabilities,the highvoltage
transistorskick inand provideadditional
power. The result isan amplifierthat runs
cooler, weighs less, is smaller and more
efficient.
POLYUREAFINISH
TheCORE PA8X140is covered witha tex-
tured black polyurea finish. An extremely
toughseamless membrane,polyurea—in
additionto beingabrasion, chemical,and
waterresistant—is airtight andprovides
sounddeadening. It ismanufactured without
theuse ofsolvents andis environmentally
friendly.

8
CAUTION:Thisproductiscapableofproducingsoundpressurelevelswhichmaycausepermanenthearingdamageafter
prolongedexposure.
THREE YEAR LIMITED WTHREE YEAR LIMITED W
THREE YEAR LIMITED WTHREE YEAR LIMITED W
THREE YEAR LIMITED WARRARR
ARRARR
ARRANTYANTY
ANTYANTY
ANTY
This warranty gives you specific legal rights, and you may also have other rights which may vary from state to state.
This warranty is extended to the purchaser and to any purchaser from him for value.
GALAXY AUDIO warrants the materials and workmanship of its products for a period of three full years from the date of the original purchase.
The following are not covered by the warranty:
1. Damage to or deterioration of the exterior cabinet which occurs after delivery.
2. Damage after initial delivery resulting from accident, misuse or neglect.
3. Damage resulting from failure to follow instructions contained in the owner’s manual.
4. Damage resulting from the performance of repairs by someone other than GALAXY AUDIO or an authorized GALAXY AUDIO service center.
5. Damage occurring during the shipment or delivery of any GALAXY AUDIO product to GALAXY AUDIO or an authorized service center after initial delivery of the product to you.
6. Damage to any GALAXY AUDIO product which has been altered, or on which the serial number has been effaced or removed.
If your unit requires service, it must be returned, shipping charges prepaid to an authorized GALAXY AUDIO service center in the United States. (This warranty is not enforceable outside the U.S.) If you are not able to
locate an authorized service center in your area, please call or write GALAXY AUDIO, 601 E. Pawnee, Wichita, Kansas 67211, [phone]. We will then refer you to an authorized service center to which the unit
may be returned, or we may advise you to return your unit to the factory for service. Under no circumstances should you return your unit to the factory without written instruction to do so. If service is required, you must
present the original or a copy of the bill of sale as a proof of date of purchase of your unit.
Upon receipt of your unit for service, GALAXY AUDIO or the authorized service center will repair or replace your unit as soon as possible, but in no event later than 30 days after the receipt of the unit. We will return
the unit to you, shipping charges prepaid, provided the necessary repairs are covered by this warranty.
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE ARE LIMITED IN DURATION TO THE LENGTH OF THIS WARRANTY, UNLESS OTHERWISE PROVIDED
FOR BY STATE LAW.
GALAXY AUDIO’S LIABILITY IS LIMITED TO THE REPAIR OR REPLACEMENT, AT OUR OPTION, OF ANY DEFECTIVE PRODUCT, AND SHALL IN NO EVENT INCLUDE INCIDENTAL OR
CONSEQUENTIAL DAMAGES OF ANY KIND.
SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS AND/OR DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUEN-
TIAL DAMAGES, SO THE ABOVE LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO YOU.
GALAXY AUDIO does not authorize any third party, including any dealer or Authorized Service Center, to assume any liability on behalf of GALAXY AUDIO or to make any warranty for GALAXY AUDIO.
With Galaxy Audio’s Far Outlet personal power source,
a lunchbox-sized rechargeable supply of 110 house-
hold current, the CORE PA8X140 can be used where no
ACpowerisavailable.TheFAROUTLETisavailable
fromGalaxy Audiodealers.

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Distributed outside the United States and Canada by E and E Exports, Inc. 17922 Sky Park Circle, Suite P, Irvine, CA 92714
949.440.0760 FAX [phone]
Distributed in Canada by A.C. Simmonds & Sons Limited 580 Granite Court, Pickering, Ontario, Canada L1W 3Z4
905.839.8041 FAX [phone]
601 E. Pawnee Wichita, KS 67211 316. 263.2852 FAX [phone] www.galaxyaudio.com
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