Radio Shack 32-2055 Скачать руководство пользователя страница 12

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The Basics

Beyond the Basics

monitoring sound sources

To monitor the sound sources, plug a pair of mono or stereo
headphones (not supplied) with a ¼-inch (6.35mm) plug into
the

PHONES

jack on the front of the ampliﬁ er. Headphones

sometimes make it easier to check and adjust the sound
source's balance.

listening safely

To protect your hearing, follow these guidelines when you
use headphones.

• Set the volume to the lowest setting before you begin

listening. After you begin listening, adjust the volume
to a comfortable level.

• Do not listen at extremely high volume levels.

Extended high-volume listening can lead to
permanent hearing loss.

• Once you set the volume, do not increase it. Over

time, your ears adapt to the volume level, so a volume
level that does not cause discomfort might still
damage your hearing.

using the feedback ﬁ lter

The

FEEDBACK FILTER

control lets you reduce or eliminate

squeal and other noise caused by feedback. After you adjust

LEFT/RIGHT

volume,

MIC1

MIC2

MIC3

MIC4/PHONO

, and

CD/AUX

, turn on the ampliﬁ er and any connected sound

sources. If you hear any feedback, turn

FEEDBACK FILTER

clockwise until you reduce or eliminate the feedback.

The

FEEDBACK FILTER

control decreases feedback

frequencies by up to 12dB. If it does not eliminate
the feedback, try using a frequency equalizer to
further decrease the feedback frequencies.

NOTE

PHONES

Jack

operating your ampliﬁ er

1. Start the input sound source.

2. Make

sure

LEFT

and

RIGHT

volume control on the

front of the ampliﬁ er are set to

MIN

3. Press

POWER

in to turn on the ampliﬁ er. The blue

light around the power switch and

LEFT/RIGHT

volume control will illuminate.

4. Rotate

LEFT

and

RIGHT

volume controls to their

middle positions.

5. One at a time, adjust

MIC1

MIC2

MIC3

MIC4/

PHONO

, and

CD/AUX

to the desired volume and

balance.

If you hear feedback after you adjust these controls,
turn

FEEDBACK FILTER

clockwise until the noise

disappears (see “Using the Feedback Filter,” p. 23).

6. Adjust

LEFT

and

RIGHT

volume controls to the

desired volume level after you ﬁ nd your desired
balance.

Left Volume

Control

Right Volume

Control

Power

Switch

MIC2

MIC1

MIC3

MIC4/

PHONO

CD/AUX

FEEDBACK

FILTER

NOTE

Содержание 32-2055

Страница 1: ... power you need in a professional sound system Its wide frequency response easily handles ampliﬁcation of voice and music Use it anywhere you need to deliver special announcements with excellent sound It is perfect for meeting halls auditoriums sporting events schools or in the ofﬁce for paging systems With a bridged speaker connection the ampliﬁer can produce up to 350 watts of clean powerful sou...

Страница 2: ...erating your ampliﬁer 22 monitoring sound sources 23 listening safely 23 using the feedback ﬁlter 23 using the level meters and clipping indicator 24 CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE THE COVER OR BACK NO USER SERICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED PERSONNEL The lightning symbol is intended to alert you to the presence of uninsulated dangerous voltage within ...

Страница 3: ... ampliﬁer resets itself when the problem is corrected A B Speaker Switch Select the speakers you want to use with the ampliﬁer in Channel A Channel B or both for use with 8 ohm speakers only MIC 1 MIC 2 and MIC 3 Adjust volume for the connected microphones MIC 4 PHONO Adjust volume of connected microphone MIC 4 or turntable FEEDBACK FILTER Turn to control audio feedback Volume Control Left Right s...

Страница 4: ...igh level sound source for music or special effects EQ BYPASS Selector Select EQ if you are using an equalizer or BYPASS if you are using another external processor STEREO MONO Selector Select bridged mono input mode in combination with a mono signal source plugged into the left channel Speaker Terminals Connect two sets of speakers Left and Right for A and B Audio Input Jacks Connect input source...

Страница 5: ...re or electric shock 16 Never push objects of any kind into this appliance through openings as they may touch dangerous voltage points or short out parts that could result in a ﬁre or electric shock Never spill liquid of any kind on the appliance important safety instructions UL 6500 1 Read all safety and operating instructions before the appliance is operated 2 Keep all safety and operating instr...

Страница 6: ...ons Adjust only those controls that are covered by the operating instructions as an improper adjustment of other controls may result in damage and will often require extensive work by a qualiﬁed technician to restore the appliance to normal operation If the appliance has been dropped or damaged in any way When the appliance exhibits a distinct change in performance 19 Do not attempt to service thi...

Страница 7: ...ont of ampliﬁer is out and AC power cord is not plugged in connecting microphones You can connect up to four high or low impedance microphones to the microphone inputs on the back of the ampliﬁer Each input labeled MIC1 MIC2 MIC3 and MIC4 has a balanced and unbalanced jack You need a microphone with a inch 6 35mm plug to connect to an unbalanced jack or a microphone cord with a 3 pin XLR plug to c...

Страница 8: ...from an outside equalizer They do not handle the signal from this equalizer s stereo INPUT jacks NOTE CD AUX Jack MIX BUS Jack EQ IN OUT Jacks If your microphone cord is longer than 20 feet 6 meters we recommend that you connect it to a balanced jack to reduce signal hum If you connect a microphone to both balanced and unbalanced jacks for MIC1 MIC2 MIC3 or MIC4 the microphone you connect to the u...

Страница 9: ...ur total speaker impedance is 8 ohms NOTE connecting speakers You can connect one or more 4 8 or 16 Ohm speakers to the ampliﬁer To ensure equal volume from each speaker all connected speakers should have the same impedance rating Proper phasing is important when you use more than one speaker in the same room or area Out of phase speakers can lose up to one half of their potential volume and can h...

Страница 10: ...on Use this connection if you are connecting more than one speaker on the same channel or if you do not have high power speakers 1 Connect the speaker wires to the corresponding left and right positive and negative speaker terminals 2 Connect the other end of the left and right speaker s positive and negative wires to the ampliﬁer s corresponding SPEAKER LEFT and SPEAKER RIGHT terminals for each c...

Страница 11: ...ction Use this connection if you have high power speakers that can handle a power output of 350 Watts For a bridged connection do not connect any speaker wire to the black SPEAKER terminals 1 Connect the speaker wires to the speaker s positive and negative terminals 2 Connect the other end of the speaker s positive and negative wires to the ampliﬁer s red SPEAKER LEFT and SPEAKER RIGHT terminals S...

Страница 12: ...C2 MIC3 MIC4 PHONO and CD AUX turn on the ampliﬁer and any connected sound sources If you hear any feedback turn FEEDBACK FILTER clockwise until you reduce or eliminate the feedback The FEEDBACK FILTER control decreases feedback frequencies by up to 12dB If it does not eliminate the feedback try using a frequency equalizer to further decrease the feedback frequencies NOTE PHONES Jack operating you...

Страница 13: ... Holder Cap NOTE NOTE using the level meters and clipping indicator The illuminating ﬂow of the output LED indicators reﬂect the ampliﬁer s output level The stronger the signal the more LEDs illuminate The maximum signal through the MPA 250 should cause the CLIPPING LED to blink at peak music levels using speaker A B Press in SPEAKER A or SPEAKER B on the front of the ampliﬁer for the channel you ...

Страница 14: ...se until you reduce or eliminate feedback Your microphones or speakers could be too close together Reposition the microphones and speakers product speciﬁcations Input Impedance 20k Ohms Continuous Output Power Stereo at 1 kHz 125 Watts x 2 8 Ohms Stereo at 1 kHz 175 Watts x 2 4 Ohms Bridged at 20 Hz to 20 kHz 250 Watts 8 Ohms Bridged at 1 kHz 350 Watts 8 Ohms Total Harmonic Distortion 70 Watts 8 O...

Страница 15: ...00 Taylor Street 6th Floor Fort Worth TX 76102 04 04 Keep the ampliﬁer dry If it gets wet wipe it dry immediately Use and store the ampliﬁer only in room temperature environments Handle the ampliﬁer carefully do not drop it Keep the ampliﬁer away from dust and dirt and wipe it with a soft cloth occasionally to keep it looking new If your ampliﬁer is not performing as it should take it to your Radi...

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