Lowell PA250A Installation Sheet And Operators Manual Download Page 2

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REMOVABLE

PHOENI X

CONNECTOR

Lowell Manufacturing Company

100 Integram Drive

Pacific, Missouri 63069 U.S.A.

Call: 800-325-9660

Fax: 636-257-6606

Click: www.lowellmfg.com

 

Read these instructions.    

Keep these instructions.    

Heed all warnings.  

Follow all instructions.       

Do not use this apparatus near water.    

Clean only with a dry cloth. 
Do not block any ventilation openings.  Install in accordance with manufacturer

’s instructions. 

Do not install near any heat sources such as radiators , registers, stoves, or other apparatus (including amplifiers) 

that produce heat. 

Do not defeat the safety purpose of the polarized or grounding-type plug.  A polarized plug has two blades with 

one wider than the other.  A grounding-type plug has two blades and a third grounding prong.  The wide blade or 
third prong is provided for your safety.  If the provided plug does not fit into your outlet, consult an electrician for 
replacement of the obsolete outlet. 

Protect the power cord and plug from being walked on or pinched particularly at plugs , convenience receptacles, 

and the point where it exits from the apparatus. 

Only use attachments and accessories specified by the manufacturer . 
Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. 

When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over. 

Unplug this apparatus during lightning storms or when unused for long periods of time . 
Refer all servicing to qualified 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 fallen into the 
apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped. 

The plug on the power cord is the AC mains disconnect device and must remain readily operable .  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 mounting, provide adequate ventilation.  Equipment may be located above or below this apparatus, but 

some equipment (like large power amplifiers) may cause an unacceptable amount of hum or may generate too 
much heat and degrade the performance of this apparatus. 

This apparatus may be installed in an industry standard equipment rack .  Use screws through all mounting holes 

to provide the best support. 

WARNING: 

To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.  Apparatus 

shall not be exposed to dripping or splashing and no objects filled with liquids, such as vases, shall be placed on the 
apparatus.  This product may contain chemicals known to the State of California to cause cancer , or birth defects or 
other reproductive harm. 

NOTE: This equipment may generate, uses, and can radiate radio frequency energy and, if not installed and used in accordance 
with the instructions, may cause harmful interference to radio communications .  However, there is no guarantee that interference 
will not occur in a particular installation.  If this equipment does cause harmful interference to radio or television reception, which 
can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more 
of the following measures:  Reorient or relocate the receiving antenna. 
Increase the separation between the equipment and receiver. 
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. 
Consult the dealer or an experienced radio/TV technician for help. 

 

CAUTION:

 Changes or modifications not expressly approved by Lowell Manufacturing will void the manufacturers warranty .  

IMPORTANT SAFETY INSTRUCTIONS

Instruction Sheet

IS-PA250A

Issued: 1-18-19

Summary of Contents for PA250A

Page 1: ...wellmfg com PA250A INSTALLATION SHEET AND OPERATORS MANUAL PA250A General Description The PA250A power amplifier provides 250 watts of continuous RMS power directly into a minimum 4W speaker load or uses the internal 25V 70V output transformer to feed 250W to distributed speaker systems The PA250A was designed to be used as a 250 watt booster amplifier to increase the power capability of Lowell s ...

Page 2: ...he 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 mounting provide adequate ventilation Equipme...

Page 3: ...isolated line level inputs but the 600W input has lower input sensitivity than the TEL PAGE input In other words the TEL PAGE input is a hotter input so it takes less input signal to drive the amplifier to full power when using the TEL PAGE input Red Peak LED Note If the red peak LED flashes it indicates the peaks are approaching full power A steady bright red glow could indicate that the amplifie...

Page 4: ...IL 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 r...

Page 5: ...wer source If this unit is to be used where the VOLTAGE SELECT must be switched to 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 Green Earth E or Safety Ground White Neutral N and Black Line L or Hot Note If a British Standard BS1363 plug is inst...

Page 6: ...y for the amplifier used For example if a 4W speaker can handle 250 watts and it will be fed from the 4W output of the amplifier an amplifier with a power output of 250 watts or less should be chosen so that if the amplifier is turned all the way up the speaker will be able to handle the amplifier s full power output All of the Series Parallel configurations shown below will result in load impedan...

Page 7: ...f 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 how many speakers are required and in what locations and what power tap will be used for the speakers to be loud enough for this application...

Page 8: ... 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 total speaker load will be 0 25W X 10 speakers 2 5W If the amplifier is turned all the way up so its output is 70 vol...

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