Speakers, Speaker Phasing | Radio Shack 811081640B, 32-2001, MPA-40

32-2001.fm Page 5 Friday, February 4, 2000 7:53 AM

PHONO/AUX/CD Switch — select the input source. Even if you connected auxiliary equipment to both the PHONO and AUX/CD input jacks, you can use only one source at a time.

Speaker Push Terminals — press the appropriate tab to open a terminal. In- sert the end of a speaker wire into the opening, then release the tab to close the terminal and secure the wire (see “Connecting Speakers” on Page 7).

AC Power Cord — to use AC power, simply plug this attached cord into a standard AC outlet.

4A/12V (4-Amp/12-Volt DC Power) Jack — connect the supplied DC power

cable’s barrel plug to this jack if you want to temporarily power the amplifier from your vehicle’s 12-volt battery. Then connect the cable’s other end to your vehicle’s 12-volt accessory socket (such as a cigarette-lighter socket).

Cautions:

•Your vehicle must have a negative- ground electrical system. If you are not sure it does, check with your vehicle dealer.

•Unplug the AC power cord before you connect the DC power cable. Likewise, disconnect the DC power cable before you plug in the AC power cord.

ˆSpeakers

SPEAKER PHASING

Phasing is the direction the speaker cone moves with reference to the polari- ty of the connection wires. Proper phas- ing 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 have a significantly decreased bass effect.

Speakers are in phase if all the speaker cones move in the same direction when an equal signal is applied. Phasing is correct if you observe the correct polari- ty (+ to + and – to –) when connecting the speakers.

Most speaker terminals are color-coded or have a mark that indicates the termi- nal’s polarity. Usually, terminals with positive polarity are red or have a plus symbol (+), and terminals with negative polarity are black or have a minus sym- bol (–). If the speaker terminals are un- marked, follow these steps to determine their polarity.

1.Remove about 1 inch of insulation from both ends of a short piece of wire (not supplied; available at your local RadioShack store). Then twist the exposed wire to secure all its strands.

2.Connect one end of the wire to one of the speaker terminals.

MPA-40, 32-2001, 811081640B specifications

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