Model PA635X
Page 7
© 2001 Xantech Corporation
3. Using good quality speaker wire, connect the individual speaker leads to the 4-terminal "SPEAKER" connectors
on the PA635X as shown.
4. The PA635X is 4-Ohm safe in Stereo Mode. Make sure the impedance presented to the speaker terminals by the
speakers (or any combination of speakers) is 4-Ohms minimum.
5. Be sure to observe correct polarity by connecting the "+" and "–" terminal from each channel on the PA635X to
the corresponding "+" and "–" terminals on each speaker. This will ensure correct "phasing" - see Fig. 5 and
Speaker Phasing below. Since the connectors are removable, you may unplug them for ease of lead assembly.
6. As a rule of thumb, use 18 gauge speaker wire for speaker runs up to 30' (9m), 16 gauge up to 70' (21m), and 14
gauge up to 150' (39m). The 4-terminal connectors accept wire sizes up to 12-gauge max.
7. Strip the insulation back about 1/4" (6mm) and twist the strands on each lead to prevent fraying.
CAUTION: After lead ends are inserted and the screws tightened down, be sure there are no free strands that
could cause shorting!
Speaker Phasing
To obtain stable imaging and full bass response, it is imperative that stereo speakers be connected "in phase" with
each other. You can verify this as follows:
a) If the "+" (positive) and "–" (negative) terminals on your speakers are correctly marked, and visible, and you have
wired the system as shown in Figs. 5 and 6, then the system will be "in phase". No further action is required.
Most manufacturers identify the positive terminal with a red binding post, a "+" sign, or a red dot.
b) If you are unsure of the markings, you can verify the phasing. Using a mono sound source, such as AM radio,
alternately reverse the leads to one of the speakers. Pick the connection that delivers a solid center image
between the speakers as well as best bass response.
LEFT
RIGHT
SPEAKER
+
-- --
+
LEFT
RIGHT
1
STEREO
MONO
BRIDGED
MODE
+
BRIDGED
--
1V
.2V
3V
LEVEL
LEFT
RIGHT
SPEAKER
+
-- --
+
LEFT
RIGHT
2
STEREO
MONO
BRIDGED
MODE
+
BRIDGED
--
1V
.2V
3V
LEVEL
VIDEO
AUDIO
L
R
1
RCA Type
Patch Cords
Preamp Outputs
ZPR68, etc.
PA635X
Rear Panel
+
Be sure speakers are
connected with correct
polarity as shown.
Wall speakers,
shelf speakers, etc.
Left
Right
Set
MODE
Switch to
BRIDGED
position
+
FIGURE 6 – BRIDGED MODE CONNECTIONS