Lowell PA250 Manuel d'utilisateur télécharger pdf (Page 5)

Instruction Sheet

IS-PA250

Issued: 5-1-14

Lowell Manufacturing Company

100 Integram Drive Pacific, Missouri 63069 U.S.A.

Call: 800-325-9660

Fax: 636-257-6606 Click: www.lowellmfg.com

POWER WIRING

The PA250 includes a power cord with a standard 15A 120VAC 3-pronged grounded plug. A push-to-reset circuit

breaker for the amplifier is provided on the front panel. An unswitched 120VAC (2A max.) convenience outlet is

provided on the rear panel. Warning: THIS UNIT MUST BE EARTH GROUNDED.

PASSIVE CONVECTION COOLING AND VENTILATION

This unit is cooled via passive convection and therefore designed for continuous operation. Excessive heat due to

. Do

.

MOUNTING THE AMPLIFIER

The PA250 may be placed on a wooden or metal wall-mount shelf. Do not remove the rubber feet from the bottom

of the amplifier chassis. When the amplifier is placed on a countertop or is shelf-mounted, the rubber feet maintain

the proper spacing under the amplifier for passive convection cooling. Do not place anything on top of the amplifier

where the vents on the top of the chassis would be blocked. Rack mount ears are built into the front panel of the

PA250. If the amplifier will be rack mounted, we recommend that you provide a minimum of 1.75

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

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. The PA250 is very

heavy, so we recommend that you provide rear support for the amplifier when rack mounting it to remove some of

the load from the built-in rack mount ears.



The amplifier includes a mono high-impedance unbalanced auxiliary input which may be used for connecting signal

sources such as an AMFM tuner, CD player, Cassette deck, or an unbalanced feed from an equalizer or mixer/

preamplifier. Two (2) parallel RCA-phono connectors are provided for the aux input so stereo input cables can be

connected to this mono input. Mono inputs need only use one or the other of the RCA-phono connectors.

600W CHANNEL INPUT WIRING

From an

External

Device

Balanced

Line-level

600W

Output

600W Stranded Twisted-Pair Wiring

Shielded wiring from an external device feeding the 600W

balanced line level would typically be required as shown below.

BUTT SHIELD

(No connection)

DRAIN

SHIELD

The amplifier includes a 600W line level input channel. This input accepts a low impedance balanced 600W line

level signal that would typically be fed from an equalizer, from another system, or from some other outboard device.

Note: The MIC/TEL Input and the 600W Line Level Input are both 600W balanced line level inputs, but the MIC/TEL

. If distortion results from

feeding the MIC/TEL input with a high level signal, use the 600W Line Level Input instead.

600W INPUT CHANNEL

TEL-PAGE

GND

600W

TELEPHONE TEL-PAGE CHANNEL INPUT WIRING

From the

Telephone

System

Page-Port

Output

600W Twisted-Pair Wiring

Shielded wiring from the telephone system is typically not required, but if

shielded wiring is used, drain the shield at the telephone input and butt

the shield (no connection) at the telephone system page port output.

BUTT SHIELD

(No connection)

DRAIN

SHIELD

TEL-PAGE INPUT CHANNEL

The amplifier includes a telephone input at the TEL-PAGE channel. This input accepts a low impedance balanced

600W line level input that would typically be available as a page port output from a telephone system. Note: The

MIC/TEL Input and the 600W Line Level Input are both 600W balanced line level inputs, but the MIC/TEL Input is a

. If distortion results from feeding the MIC/

TEL input with a high level signal, use the 600W Line Level Input instead.

TEL-PAGE

GND

600W

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Lowell PA250 Manuel d'utilisateur Page 5

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