Universal 2-Way  (400-1296A)       Operation          Faxback Doc. # 14334
Crossover Network

CROSSOVER FREQUENCY

The Crossover Frequency is the frequency point midway between two adjacent
filter networks.  At the crossover frequency, equal voltages should go to
each speaker.  For this unit, the stated crossover frequency is based on
an 8 ohm load.  (Actually, the crossover frequency may vary due to
constantly changing speaker impedance -- an 8 ohm speaker may vary from 7
to 15 ohms or more at different frequencies.)  Using L-pads and volume
controls can cause changes in the crossover frequency, as can differences
in speaker efficiency levels and the signal distribution of program
material.

Your Crossover Network has three selectable crossover frequencies: 2,000,
2,500, and 4,000 Hz (abbreviated 2K, 2.5K, and 4K).

These are available for both woofer and tweeter:  Ordinarily, you'll want
the same crossover frequencies for woofer and tweeter.  (That is, the
tweeter's response should begin where the woofer's response ends.) 
Experiment a little to find the proper crossover frequency for your
woofer and tweeter.

SPEAKER SELECTION

To assure proper crossover points, use only 8 ohm speakers.  Use speakers
with adequate frequency range -- otherwise, you may find large "holes"
(frequencies at which the level of the audio output drops) in your speaker
system's response.

How about some ideas for speaker?  Here are three for starters -- you take
it from here:

    An 8 inch woofer (Radio Shack Cat. No. 40-1006) and a cone dynamic
    tweeter (Cat. No. 40-1270).

    A 10 inch woofer (Cat. No. 40-1331) and a midrange/tweeter (Cat. No.
    40-1289)

    A 6 1/2" woofer (Cat. No. 40-1009) and a soft dome tweeter (Cat. No.
    40-1374).

Of course, there are many other combinations that might be very pleasing. 
Take the time to browse around your local Radio Shack and see the various
combinations you might work up.

SPEAKER POLARITY AND PHASING

Speakers have two terminals with their "polarity" marked.  One is the
"hot" side (marked with a + or red dot).  The other is the common side
(marked with a - or a black dot).  When you connect speakers to your
crossover network, connect the common side of your speakers to the COM
(common) terminals on the Crossover Network and the hot side of your
speakers to the desired crossover frequency terminal.

You might want to experiment with changing the polarity of any one of the
speakers to see if this enhances the sound of your speaker system.  The
sound from the two speakers can add to or cancel each other -- this is
known as phasing.  Incorrect phasing causes a deterioration in sound
quality or a "hole" (absence of sound) in the frequency response of your
 speaker system.

CONNECTIONS

Before making connections, mount the Crossover Network so you can
determine correct lead length.  Your Crossover Network can be mounted with
sheet metal or wood screws to the inside of the speaker enclosure.  (Take
care to avoid crating air leaks in the enclosure when installing your
Crossover Network.)

Connect the + side of the tweeter terminals to either the 2K, 2.5K, or 4K
terminal of the tweeter, depending on the crossover frequency desired. 
Connect the - side of the tweeter terminals to the COM terminal.  Do the
same for the woofer;  connect the + side to the crossover frequency
desired on the woofer side and connect the - side to the other COM
terminal.

When wiring the leads, cut and strip the wire to the desired length.  Make
secure connections (either solder or crimp terminals) at both ends.  Make
sure no stray wires short across to adjacent terminals.  The input
terminals of the Crossover Network should be connected to a binding post,
terminal strip, jack or similar connector for easy connection of the
speaker to your amplifier/receiver.  (Be sure to match polarities at these
output terminals.)

NOTE:  This Universal Crossover Network is designed to handle up to 100
       watts of audio power (maximum music power).

(ALL-03/23/95)