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s o n a m p
a 1 5 0 s u b w o o f e r a m p l i f i e r
®
h
l
inputs and outputs
i
evel
c a u t i o n : D
n o t
o
l
i
e v e l
n P u t s
t o
a n
. b
o u t P u t
e F o r e
u s i n g
c h e c k t h e o t h e r a m P l i F i e r
if your system's electronics do not have preamp outputs or
subwoofer outputs you can connect its left and right speaker
outputs to the a150's h
l
i
eVel
h
l
outputs to your left and right speakers. always make
i
eVel
sure to connect the a150's "+" terminals to the electronics'
and speakers' "+" terminals, and its "–" terminals to the elec-
tronics' and speakers' "–" terminals.
n
: T
h
l
o
o T e
h e
i
e V e l
u T p u T s i g n a l i s h i
2 0 0 h
, 6 d b /
.
z
o C Ta V e
i
: i
m P o r t a n t
F y o u a r e u s i n g t h e
l
i
(
e v e l
n P u t s
s e e P a g e
c o n n e c t i o n s t o t h e
a
o
switch
uto
n
when this switch is in the ON position the a150 will
automatically turn on when it senses a signal on either of its
inputs. The amplifier will remain on for approximately 5
minutes after the signal has ceased. if you want to manually
turn the amplifier on and off, set the a
position. This allows the amplifier to be switched on and
O
off by the front-panel p
ower
subwoofer output
The a150 amplifier features a binding post speaker connector
that can accept bare wire and wire terminated in pins or
single banana connectors.
n
: i
o T e
f u s i n g s i n g l e b a n a n a C o n n e C T o r s
(
m i n a l s a r e C l o s e D
r o Ta T e D f u l lY C l o C k w i s e
.
i n g T h e C o n n e C T o r
if you use bare wire, make sure you strip only enough wire (½")
to fit into the hole in the terminal. before inserting the wire,
twist all strands tightly to prevent strays that could cause a
short circuit between the "+" and "–" terminals. To make a
secure connection, insert the wire in the direction of terminal
rotation (clockwise) to force the wire around the terminal post.
i
: a
m P o r t a n t
s
s h i P P e D
a 1 5 0
c a n
D r i v e
a
s
.
t
u b w o o F e r
o
c o n n e c t
s
,
P e a k e r
w o o F e r s
s e e
speaker Fuse
as shipped from the factory, the a150 is fitted with a 1.6a
speaker fuse that allows it to drive a single bps-1 subwoofer.
To connect two bps-1 subwoofers, you must replace this fuse
with the supplied 2.0a fuse:
1. Disconnect the power cord from the a150's power Cord
Connection.
a 1 5 0 '
c o n n e c t
t h e
a m P l i F i e r
w i t h
a
b r i D g e D
h
l
i
t h e
i
e v e l
'
s D o c u m e n t a t i o n
inputs. Then connect the a150's
-
p a s s f i l T e r e D a T
a 1 5 0 '
2 ) , D o n o t
m a k e a n y
h
l
i
.
i
e v e l
n P u t s
o
switch to the
uTo
n
button.
,
b e s u r e T h e T e r
)
b e f o r e i n s e r T
F r o m
t h e
F a c t o r y
s
s i n g l e
o n a n c e
b P s - 1
t w o
F
,
.
u s e
b e l o w
2. using a flat-blade screwdriver, remove the s
er cap from the amplifier.
h
s
i
3. replace the 1.6a fuse in the s
supplied 2.0a fuse and replace the cap in the s
,
n P u t s
holder.
.
4. Connect the two bps-1 subwoofers in parallel to the a150's
s
o
ubwoofer
front panel features
P
button
ower
when the rear-panel a
p
button turns the a150 on and off. if the a
ower
is in the ON position the p
a
leD
ctive
l
s
i n e
The a
leD illuminates whenever the a150 is operating.
CTiVe
P
leD
ower
The p
leD indicates that the a150 is connected to an
ower
active power outlet.
b
switch
yPass
The b
switch bypasses the a150's internal crossover
Ypass
network (f
requenCY
if you have connected the a150 to a surround receiver or
processor with a built-in subwoofer crossover, set the b
switch to the ON position. all of the system's subwoofer
crossover and volume functions will be handled by the sur-
round processor 's internal subwoofer crossover. refer to your
surround processor 's documentation for information about
adjusting the subwoofer 's volume.
-
if you have connected the a150 to a preamplifier 's line
-
outputs, or connected it using the h
b
switch to the O
Ypass
V
controls will function (see below).
olume
F
requency
The f
r e q u e n C Y
crossover between 40hz and 150hz. The crossover 's slope is
12db/octave. The higher you set the f
higher in frequency the bps-1 subwoofer will operate.
,
t h e
use the f
b P s - 1
requenCY
frequencies between the bps-1 subwoofer and your main speak-
-
s u b
ers. generally, the f
value if your main speakers have larger woofers, and should be
set at a higher value if your main speakers have smaller woofers.
when setting the f
smoothness of the bass. if the bass seems too strong at certain
frequencies (especially if your main speakers have larger
woofers), try lowering the f
seems too weak at certain frequencies (especially if your main
speakers have smaller woofers) try raising the f
setting.
3
f
peaker
use
.
uTpuT
o
switch is in the O
uTo
n
button will have no effect.
ower
control) and the a150's V
-l
i
eVel
position. The a150's f
control
control adjusts the amplifier 's internal
requenCY
control to achieve a smooth transition of bass
control should be set at a lower
requenCY
control by ear, listen for the
requenCY
control setting; if the bass
requenCY
f
hold-
peaker
use
holder cap with the
f
peaker
use
position, the
o
switch
uTo
n
control.
olume
Ypass
i
, set the
npuTs
and
requenCY
control the
control
requenCY
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