Lowell MA125 Скачать руководство пользователя страница 3

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

3

Amplifier Block Diagram

Technical Specifications

Dimensions:

17" wide x 3.5" high x 13.5"deep,

431.8mm wide x 88.9mm high x 342.9mm deep,

Frequency Response:  50Hz-20KHz + 3dB  (

Test signal inserted at aux input

)

AC Supply Voltage:  115VAC or 230VAC (Rear panel switchable) + 10%, 50/60Hz

Channel 7

Telephone

Page

Channel 6

Music

Channel 5

Mic/Music

Channel 4

Mic/Music

Channel 3

Mic/Music

Channel 2

Mic/Music

Switch Defeatable  Circuit  Mutes CH3-CH6

Channel 1

Mic/Music

Bass 

and 

Treble

Controls

Master 

Volume 

Control

Mixing

And

Control

Section

Power

Amplifier

Circuit  Mutes All Channels

MA60     60W RMS
MA125   125W RMS
MA250   250W RMS

8

W

70V
25V

COM

4

W

CH3

VC

CH4

VC

CH5

VC

CH6

VC

CH7

VC

CH2

VC

CH1

VC

Tape O ut

Preamp Out

Power Amp  In

Fact ory Installed 

Jumper

DC Supply Voltage:  24VDC (Max 10% deviation)

Power Consumption:

MA60

150W (if supply is AC)

5A (if supply is DC)      

MA125

300W (if supply is AC)

8A (if supply is DC)

MA250

600W (if supply is AC)

16A (if supply is DC)

Shipping Weight: MA60:  22LBS.

MA125:  24LBS.

MA250:  29LBS. 

Color:

Black    Note:  Black rack mounting brackets are included.

Speaker Level Outputs:  Screw terminal strip,  4

W

, 8

W

, 25V, 70V,  

MA60: 60W RMS,  MA125: 125W RMS,  MA250: 250W RMS

Tape Outputs:  Dual parallel RCA-phono jacks, 1V @ 4.7k

W

 output 

Preamp (

“Pre”) Outputs:  Dual parallel RCA-phono jacks, 1V @ 600

W

 output

Convenience AC Outlet:   500W maximum unswitched outlet  

Mic Inputs 1-5:  XLR receptacle or screw terminals,  1mV @ 600

W

 balanced,

Note:  With channel aux  switch depressed, XLR and screw terminal inputs still operate but are padded as line input 
150mV @ 600

W

 balanced.   

Aux Inputs 1-6:  Dual parallel RCA-phono jacks, Stereo converted to mono,  150mV @ 22k

W

 

Telephone Input 7:  Screw terminal strip, 150mV @ 600

W

 balanced 

Power Amp In:  RCA-phono jack, 1V @ 8k

W

Total Harmonic Distortion:  Less than 1% at 1kHz at rated power.

Signal to Noise Ratio:  80dB (

Test signal inserted at Aux 6 input),    

60dB (

Test signal inserted at Mic 1 input),

Tone Controls:  Bass + 10dB @ 100Hz,  10dB @ 10kHz,

Phantom Power:  16VDC, 

Shipped from factory with internal phantom power jumpers set “ON” for Channels 1-5.

To defeat phantom power, 

remove cover and set jumper to “OFF”.  Channel-1: see jumper JP1,

Channel-2: see jumper JP2, Channel-3: see jumper JP3, Channel-4: see jumper JP4, Channel-5: see jumper JP5.    

Priority Muting:  3 levels of priority.  

See section “AMPLIFIER MUTING-PRIORITY SCHEME” on page 7. 

Weight:        

  MA60:  17LBS.

MA125:  19LBS.

MA250:  24LBS. 

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...

Отзывы: