Step 4. Push the panel surface into the mounting
hole.
4. INSTALLATION
Step 1. Using the supplied paper pattern as a guide,
open a mounting hole of the dimension
specified below in the ceiling.
Step 2. Hook the speaker mounting spring into the
mounting hole in the ceiling.
3.1.a. PC-668R-AS
3. GENERAL DESCRIPTION
131-14-00187-00
URL: http://www.toa.com.sg/
Traceability Information for Europe
Manufacturer:
TOA Corporation
7-2-1, Minatojima-Nakamachi, Chuo-ku, Kobe, Hyogo,
Japan
Authorized representative:
TOA Electronics Europe GmbH
Suederstrasse 282, 20537 Hamburg,
Germany
Ceiling
5 – 25 mm
(0.2
"
– 0.98
"
)
ø250 ±5 mm
(9.84
"
±0.2
"
)
Integrated with a resin panel and speaker frame,
the PC-668R-AS and PC-668RC-AS are the
ceiling mount speakers with a metal grille
attached. They feature spring clamp mecha-
nism for easy speaker mounting to the ceiling.
The input impedance can be easily changed
by changing the tap position of the transformer.
Step 3. Make wiring.
Connect its HOT line to the black lead wire,
and COM line to the white one. Such as the
figure 2.
3.1.b. PC-668RC-AS
Insert the lead-in cables (cables from the
amplifier) and lead-cut cables (cables to other
speakers) into the input connector. Such as
the figure 3.
5. WIRING DIAGRAMS
5.2. PC-668RC-AS
HOT
(+)
COM
(-)
670
Ω
*
330
Ω
1 k
Ω
2 k
Ω
3.3 k
Ω
* Factory-preset
8
Ω
0
Matching
Transformer
Bridging Terminal
COM
5.1. PC-668R-AS
670
Ω
*
330
Ω
1 k
Ω
2 k
Ω
3.3 k
Ω
* Factory-preset
8
Ω
0
COM
(white)
HOT
(black)
Matching
Transformer
COM
Ceiling
Speaker
clamp
Matching transformer
Dust cover
COM (White)
HOT (Black)
The figure 2
The figure 3
Speaker cable
(From the amplifier)
Speaker cable
(To the next speaker)
Dust cover
The figure 1
From the amplifier
To the next speaker
COM (–)
HOT (+)
9 mm
(0.35”)
Applicable cable
Solid wire: ø0.8 – ø1.6 mm (equivalent to AWG 20 – 14)
Stranded wire (7-core): 0.75 – 1.25 mm2 (equivalent to AWG 18 – 16)
Input connector
3-2. Change the input impedance as needed.
The speaker's input is factory-preset to 670
Ω.
When changing the input impedance, detach the
black wire connected to the matching trans-
former, and reinsert it into the desired input tap
referring to the table below.
HOT (Black)
COM (White)
330
Ω
COM
8
Ω
0
670
Ω
1k
Ω
2k
Ω
3.3k
Ω
Impedance 330
Ω
670
Ω
1 k
Ω
2 k
Ω
3.3 k
Ω
-
15 W 7.5 W
5 W
3 W
15 W 7.5 W
5 W
2.5 W 1.5 W
100 V line
70 V line
The figure shows the matching trans-
former factory-preset of PC-668R-AS.
