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Connecting Your Amplifier

When making connections between any source compo-

nents and the amplifier, or when making connections to

any speaker, be certain that both the input devices and

the amplifier are turned off. To assure that there will be

no unwanted signal transients that can damage equip-

ment or speakers, it is always best to unplug all equip-

ment before making any connections.

With the new multi-channel module design of the

AT3300 amplifiers and the renaming of each channel

from actual speaker location to a just a number, we rec-

ommend using each module bank to power one side of

the room, i.e. all of the left channel speakers are pow-

ered from the left amplifier bank and all the right chan-

nel speakers are powered from the right amplifier bank.

Then use the extra amplifier channel for the center

channel speaker.

Input Connections

Connecting the amplifier to your source equipment is

simple. Using high-quality audio interconnect cables,

connect the outputs on the rear of your source equip-

ment to the input jacks on the rear panel of your ampli-

fier that have the same type of connector; any amplifier

channel can be used to drive any loudspeaker in your

room. The AT3300 amplifiers have both XLR and

RCA input connections on the rear panel. Use the slide

switch below each RCA jack to select the desired input

for each channel; you can mix input connections as

needed. We do not recommend using this switch as

another source selection. The switch actuator is flush

with the rear panel, so a small tool may be needed to

slide it to the proper position. When making connec-

tions with RCA type plugs on interconnect cables,

make certain to gently, but firmly, insert the plug into

the jack. Loose connections can cause intermittent

sound and may damage your speakers. Some quality

RCA plugs may be very tight, and it is important to

assure a proper connection between the interconnection

cable and the input jack.

Speaker Connections

To assure that the high quality signals produced by

your amplifier are carried to your speakers without loss

of clarity or resolution, we recommend that you use

high quality speaker wire. Many brands of wire are

available; the choice may be influenced by the distance

between your speakers and the amplifier, the type of

speakers you use, personal preferences, or other factors.

Regardless of the brand or type of speaker wire select-

ed, we recommend that you use a wire constructed of

fine, multi-strand copper with a gauge of 14 or less. In

specifying wire, the lower the number, the thicker the

cable. Wire with a gauge of 16 may be used for short

AT3300 Manual

runs of less than twenty feet. We do not recommend

that you use any wires with an AWG equivalent of 18

or higher due to the power loss and degradation in per-

formance that will occur.

To connect the amplifier to your speakers, a pair of

binding posts is provided for each channel output.

These posts will accept bare wire, spade lugs or banana

type plugs. If bare wire is used for the connections,

strip approximately 1/2 inch to 3/4 inch of insulation

from the end of each wire and carefully twist the

strands of each conductor together. Be careful not to

cut the individual strands or twist them off. All strands

must be used for optimal performance.

Correct polarity of connections are important to main-

tain proper speaker phasing. When speaker phasing is

correct, all speakers move in and out at the same time,

preserving the imaging of the program material. Out-of

-phase connections mean that some speaker cones will

be moving in, while others move out. This will cause

indistinct or confused imaging, and muddled and

cloudy sounds. To avoid incorrect phasing or polarity,

be certain to use wire that has distinct markings, colors,

stripes, wording, or grooves on each side of the speaker

cable. When making connections to the amp and speak-

ers, adhere to a consistent pattern of using one side of

the wire to the red terminals and the other side to the

black terminals. When using cable with markings on

one side only, traditional convention is to consider the

marked side of the wire as the red, or positive (+) con-

nection, and the non-marked side as the black or nega-

tive (–) connection.

Next, loosen the knobs of the amplifier's speaker out-

put terminals, far enough so that the pass through hole

is revealed. Follow the proper connection instructions

for your system with regard to which terminals are

used. Once the connections are made, twist the cap

back so that the connection is secured, but do not over

tighten or use tools, as this may break the delicate wire

strands and decrease system performance.

If you are using spade lugs, connect them to the speak-

er wire using the manufacturer's instructions, and then

loosen the caps on the speaker terminals. Place lugs

between the plastic cap and the back of the terminal. Be

sure to observe proper polarity, using the appropriate

speaker hook-up icons for your system's configuration.

Using your fingers, tighten to obtain a positive contact.

When using banana plugs, connections may be made

by simply inserting the jack affixed to your speaker

wire into the hole provided on the rear of the colored

screw caps on the binding posts. Before using banana

type jacks, make certain that the plastic screw caps are

firmly tightened down by turning them in a clockwise

direction until they are snug against the chassis. This

will insure that the maximum surface area of the plug is

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