Lowell MA125 Скачать руководство пользователя страница 5

Instruction Sheet

IS-MA60/125/250

Issued: 3-6-18

Lowell Manufacturing Company

100 Integram Drive

Pacific, Missouri 63069 U.S.A.

Call: 800-325-9660

Fax: 636-257-6606

Click: www.lowellmfg.com

5

 

Amplifier Installation and Connection 

This unit was carefully checked and packed before leaving the factory .  However, it is always a good idea to inspect 
the  shipping  container  and  unit  for  indications  of  improper  handling .  If  the  unit  has  been  damaged,  make  an 
immediate claim to  the  dealer or distributor from whom it was purchased .  If  the  unit  was  shipped  to you, notify the 
transportation company without delay, saving all packing materials, in order to process the claim.

INSPECTION

PASSIVE CONVECTION COOLING AND VENTILATION

This  unit is cooled via  passive convection and  therefore  designed for continuous operation.  Excessive heat  due to 
poor ventilation can shorten the lifespan of electronic equipment and could void the manufacturer’s warranty.  Do 
not block the amplifier’s vent slots located on the top, sides, and bottom of the chassis.  

SHELF MOUNTING

This  amplifier  may  be  placed  on  a  wooden  or  metal  wall-mount  shelf.    Do  not  remove  the  plastic  feet  from  the 
bottom of the  amplifier  chassis.   When  the  amplifier  is  placed  on  a  countertop or  is shelf-mounted, the plastic  feet 
maintain  the  proper spacing  under the amplifier for passive convection cooling.  Do  not  block the side vents  of the 
amplifier  chassis and do not place anything on top of the amplifier where  the vents  on  the  top of the  chassis  would 
be  blocked.   If  it  is  desired  to  stack an  equalizer, AM/FM  tuner, or  other  music  program  source  unit  on  top  of  the 
amplifier, use spacers to make sure there is a minimum of  1.75" clear above the amplifier for ventilation.  Make sure 
that the spacing blocks do not obstruct the vents on top of the amplifier chassis.

RACK MOUNTING

If the amplifier will be rack mounted, we recommend that you provide a minimum of  1.75

” of open space 

above and below the unit to assure proper ventilation.  Provide ventilation fans in the equipment cabinet if 
that  is  required to maintain  an  amplifier  operating  temperature  of  no  higher  than  92

o

  F.    To  mount  the 

amplifier  in  a  Lowell  equipment  cabinet,  use  standard  10-32  Phillips-head  machine  screws  (like  the 
Lowell model RS or RSP rack screws) with integral plastic washers to protect the finish of the front panel 
of the amplifier.  R

ack mounting brackets for the amplifier are included.

   

 

The AC power cord provided  with  this amplifier  is  equipped with a  North  American  style NEMA  5-15P plug  and the 
AC SUPPLY SWITCH (see  item on page 4) is set to operate on a 115 VAC 50/60 Hz. power source.  The amplifier 
may  also  be  powered  with  24VDC  (See  the  DC  current  requirements  under  POWER  CONSUMPTION  in  the 
TECHNICAL SPECIFICATIONS section on page 3). 

If  this  unit  is  to  be  used  in  other  geo-political  areas  of  the  world, it  may  be necessary  to  change  the  AC  SUPPLY 
SWITCH to operate on 230 VAC.  Remove the plug from the end of  the cord and replace it with one appropriate for 
the  local  power  grid  receptacle  standards.    The  internal  wire  color  code  for  the  cord  supplied  with  this  unit  is  as 
follows:
Green/Yellow    

Earth “E” or Safety Ground

Blue                       

Neutral “N”

Brown                   

Line “L” or Hot

Note:  If a British Standard BS1363 plug is installed, it must be provided with a 5 Amp fuse.
Since  electrical  color  codes  vary  around  the  world,  make  sure  that  the  correct  connections  are  made  to  the  cord 
even if the local color code is different.  If in doubt, obtain the services of a locally qualified electrical professional.

POWER WIRING

Before  installing  the  amplifier, continue  the inspection  by  running  a  quick  performance  check.   Connect an 8

W

 test 

speaker  to the 8

W

 direct output terminals and  a tuner, tape deck, or CD  player  to one  of the aux inputs and  set  the 

controls for operation.  CAUTION: TO PROTECT THE SPEAKER FROM DAMAGE , DO NOT TURN THE UNIT ON 
UNTIL  ALL  CONNECTIONS  HAVE  BEEN  MADE.    IN  ADDITION,  MAKE  SURE  THE  UNIT  IS  GROUNDED 
BEFORE TESTING.  In this way you can check the basic operation of the amplifier before actually installing the unit 
and  making all of  the final terminations required  for  the permanent  installation.   If  shipping damage  has resulted in 
the amplifier being inoperable out of the box, call Lowell Customer Service to arrange for a replacement .

INITIAL PERFORMANCE CHECK

WARNING:

THIS AMPLIFIER MUST BE EARTH GROUNDED.

Содержание MA125

Страница 1: ... the POWER AMP IN jack A chassis ground termination screw is available on the rear panel The front panel includes channel 1 5 volume controls treble and bass controls a master volume control a main power switch and an output level LED display Rack mounting brackets are included with each model Optional Accessories sold separately Lowell Manufacturing offers a full line of 19 equipment cabinets wal...

Страница 2: ...To completely disconnect this apparatus from the AC mains disconnect the power supply cord plug from the AC receptacle This apparatus shall be connected to a mains socket outlet with a protective earthing connection When permanently connected an all pole mains switch with a contact separation of at least 3 mm in each pole shall be incorporated in the electrical installation of the building If rack...

Страница 3: ...BS MA250 29LBS Color Black Note Black rack mounting brackets are included Speaker Level Outputs Screw terminal strip 4W 8W 25V 70V MA60 60W RMS MA125 125W RMS MA250 250W RMS Tape Outputs Dual parallel RCA phono jacks 1V 4 7kW output Preamp Pre Outputs Dual parallel RCA phono jacks 1V 600W output Convenience AC Outlet 500W maximum unswitched outlet Mic Inputs 1 5 XLR receptacle or screw terminals 1...

Страница 4: ...jack or screw terminals Circuit Breaker for Convenience Outlet 1 2 3 4 5 6 7 8 9 10 11 12 Circuit Breaker for Amplifier Earth Ground Connection Screw Power Amp Input RCA Jack Preamp Output RCA Jacks Tape Output RCA Jacks Aux 6 Level Control Aux 6 Input RCA Jacks Aux 5 Input RCA Jacks Mic 5 Aux 5 Selector Switch Mic 5 Input XLR Jack Mic 4 Input XLR Jack 4 2 13 14 15 16 17 18 19 20 21 22 23 Convenie...

Страница 5: ...amplifier operating temperature of no higher than 92o F To mount the amplifier in a Lowell equipment cabinet use standard 10 32 Phillips head machine screws like the Lowell model RS or RSP rack screws with integral plastic washers to protect the finish of the front panel of the amplifier Rack mounting brackets for the amplifier are included The AC power cord provided with this amplifier is equippe...

Страница 6: ...telephone cables or other low voltage wiring that could pick up the signal from the higher level speaker cables DO NOT run high impedance unbalanced wiring more than 20 to avoid picking up noise and affecting the frequency response of the sound system DO use shielded cable for all microphone and line level cables except the balanced 600 ohm input line from a telephone system may be twisted pair ca...

Страница 7: ... or screw terminal inputs not the Channel 1 aux inputs have the second highest level of muting priority The telephone input always mutes Channel 1 The Channel 1 XLR and screw terminal inputs mute Channels 3 6 as long as the Channel 1 mute switch is in the ON position The Channel 1 muting is active whether using the XLR or screw terminal inputs in the microphone mode with the aux switch in the MIC1...

Страница 8: ...mono outputs to two different devices such as a booster amplifier or equalizer As shown in the AMPLIFIER BLOCK DIAGRAM on page 3 the PREAMP OUT jacks are fed from the output of the master volume control In other words if you wish the levels to be adjusted as a result of changes in the setting of the MASTER volume control that may need to be adjusted due to crowd noise in a live performance the PRE...

Страница 9: ...per Between Pre Out And Power Amp In OPTIONAL 1 3 OCTAVE EQUALIZER BY OTHERS High Z Input High Z Output Type 1 Type 1 Connection to two 2 1 3 octave equalizers using Lowell PA250A booster amplifiers with similar and different types of loudspeakers Note Similar speakers are fed by the same equalizer LOWELL PA250A BOOSTER AMPLIFIER Aux In Jack To Speakers Note Jumper cords shown are not included Ins...

Страница 10: ...amage the amplifier and void the manufacturer s warranty It is also important to pay attention to the power rating of the speakers used If an 8W speaker is fed from the 8W output of an amplifier and the amplifier is turned all the way up the speaker will receive the maximum power output of the amplifier A speaker must be chosen with sufficient power handling capacity for the amplifier used For exa...

Страница 11: ...M 572 5 watt 70V 25V dual voltage transformer That means that this speaker can be used on both 70V systems and 25V systems The 8W secondary of the transformer is connected directly to the 8W input terminals on the 810 speaker The primary has transformer taps for either 70V or 25V at 0 25W 0 5W 1W 2W and 5W When a designer is mapping out the coverage of these ceiling speakers he she will determined...

Страница 12: ...ker load to no more than 106 25W Since we know from our example that 100 speakers would be required it is obvious that tapping the speakers at 1W is the best choice Some system designers feel it is best to tap the speaker transformers as high as possible Consider an example where a sound system that has a 125W 70V amplifier only has 10 speakers If the transformers are tapped at 0 25W each the tota...

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