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Bolt-On Transformer
MTC-CBT-70T
Professional Series
Key Features:
䉴
Adapts the CBT 70J-1 (and 70JE-1)
for Use on Distributed Speaker
Lines
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120W, 60W, 30W for 70V or 100V
(plus 15W for 70V)
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Bolts onto Back of CBT 70J-1 or
70JE-1 Speaker
䉴
Gland Nuts Provide Water Tight
Seal
Applications:
MTC-CBT-70T is a bolt-on
transformer module to adapt
CBT 70J-1 and CBT 70JE-1 (and
CBT 70J-1/JE-1 arrays) for use on
distributed loudspeaker lines. It
allows long cable runs and multiple
speakers to be driven from a single
distributed system amplifier channel.
Transformer taps include 120W,
60W, and 30W for 70V and 100V
distributed lines, plus 15W for 70V
only.
Connections are made via
customer-supplied cable to screwdown terminals inside the enclosure.
Two gland nuts are provided – one
for the cable into the enclosure from
the amplifier and one for the cable
from the enclosed terminal strip to
the input terminal of the loudspeaker.
The gland nuts form a water-tight
seal when used with round jacketed
cable with outside diameter between
4.0 mm (0.16 in) and 9.0 mm
(0.36 in).
The tap selection is made via the
terminal connection of the cable from
the power amplifier to the
appropriate terminals on the internal
terminal strip.
Mounting holes are provided that
fit via two 6 mm screws to any of the
two side-by-side insert points on the
back of the CBT 70J-1 or CBT 70JE-1
cabinet.
Note that MTC-CBT-70T extends
86 mm (3.4 in) from the back of the
CBT cabinet.
Available in black or white (-WH).
Module for CBT 70 Models
Cable not included.
Specifications:
Transformer Taps: 120W, 60W, 30W (and 15W at 70V only)
Connection: CE-compliant barrier strip terminals. Terminals accept up to
TERMINALS:
Terminal 1 = Common (black wire from transformer)
Terminal 2 = 120W @ 70V, N/C @ 100V (orange wire from transformer)
Terminal 3 = 60W @ 70V, 120W@100V (purple wire from transformer)
Terminal 4 = 30W @ 70V, 60W @ 100V (blue wire from transformer)
Terminal 5 = 15W @ 70V, 30W @ 100V (white wire from transformer)
Terminal 6 = N/C (no wire from transformer)
Terminal 7 = + Output to loudspeaker + terminal (yellow wire from
Terminal 8 = – Output to loudspeaker - terminal (green wire from
Maximum Insertion Loss = Less than 1 dB at any tap.
Gland Nuts: Two total. One gland nut by the transformer selection
Mounting to Speaker Cabinet: Two holes in the back of the enclosure 70 mm (2.75 in) apart.
Enclosure Material: Fiberglass filled ABS.
Environmental Capability: IP-55 rated, per IEC529. UV, moisture and salt-spray resistant.
Agency Rating: Transformer UL registered per UL1876, Isolating Signal and
Dimensions (H x W x D): 157 x 114 x 86 mm (6.2 x 4.5 x 3.4 in) including gland nuts.
Net Weight: 1.13 kgs (2.5 lbs)
Shipping Weight: 1.36 kgs (3.0 lbs)
Included Accessories: Two 6 mm (x 15mm length x 1.0 thread pitch) bolts, flat
JBL continually engages in research related to product improvement. Some materials, production methods and design
refinements are introduced into existing products without notice as a routine expression of that philosophy. For this
reason, any current JBL product may differ in some respect from its published description, but will always equal or
exceed the original design specifications unless otherwise stated.
8 mm outside 4 mm inside open-lug (#6 or #8) plus bare wire
up to 2.5 mm2(12 AWG).
transformer)
transformer)
terminals for cable from amplifier and one gland nut by the
transformer secondary terminals (green and yellow wires) for
output to speaker terminals. It is recommended to orient gland
nuts toward bottom of enclosure.Watertight seal requires
round jacketed cable with outside diameter between 4.0 mm
(0.16 in) and 9.0 mm (0.36 in).
Insert included 6 mm screw from inside MTC-CBT-70T
enclosure, using 1 flat washer and 1 lock washer, into the
side-by-side M6 insert points on the back of the CBT70J-1 or
CBT70JE-1 cabinet.
Feedback Transformers for Use in Electronic Equipment.
128 mm (5.0 in) enclosure height for enclosure only.
washers & lock washers
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䉴 MTC-CBT-70T Bolt-On Transformer Module for CBT 70 Models
V
Dimensions
128
[5.0]
Wiring Diagram
CONNECTION:
Transformer Wire Color Code
Green
Yellow
–)
(+)
(
White
N/C (none)
114
[4.5]
Blue
Purple
120W60W30W NC
Orange
COM(–)
COM(–)120W60W30W15W
157
[6.2]
Black
100
70V
86
[3.4]
Mounting onto Speaker
70
[2.8]
64
[2.5]
Out to
CBT Input
Terminals
Connect “–” to C OM
and “+” to
proper input tap.
In from
70V/100V
Amplier
Shown mounted to top insert points of CBT 70J-1.
JBL Professional
8500 Balboa Boulevard, P.O. Box 2200
Northridge, California 91329 U.S.A.
© Copyright 2013 JBL Professional
www.jblpro.com
SS MTC-CBT-70T
CRP
01/13
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