3
h
i
l
evel
inputs and outputs
c au t i o n : D
o
n ot
c o n n e c t t h e
a 1 5 0 ’
s
h
i
l
e v e l
i
n P u t s t o a n a m P l i F i e r w i t h a b r i D g e D
o u t P u t
. b
e F o r e
u s i n g
t h e
h
i
l
e v e l
i
n P u t s
,
c h e c k t h e o t h e r a m P l i F i e r
’
s D o c u m e n tat i o n
.
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
i
l
eVel
inputs. Then connect the a150’s
h
i
l
eVel
outputs to your left and right speakers. always make
sure to connect the a150’s “+” terminals to the electronics’
and speakers’ “+” terminals, and its “–” terminals to the elec-
tronics’ and speakers’ “–” terminals.
n
oT e
: T
h e
h
i
l
e V e l
o
u T p u T s i g n a l i s h i
-
pa s s f i lT e r e D aT
200h
z
, 6db/
o C Ta V e
.
i
m P o r ta n t
: i
F y o u a r e u s i n g t h e
a 1 5 0 ’
s
l
i n e
l
e v e l
i
n P u t s
(
s e e Pa g e
2 ) , D o n ot
m a k e a n y
c o n n e c t i o n s t o t h e
h
i
l
e v e l
i
n P u t s
.
a
uto
o
n
switch
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
uTo
o
n
switch to the
OFF
position. This allows the amplifier to be switched on and
off by the front-panel p
ower
button.
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
oT e
: i
f u s i n g s i n g l e b a n a n a C o n n e C To r s
,
b e s u r e T h e T e r
-
m i n a l s a r e C l o s e D
(
r oTaT e D f u l lY C l o C k w i s e
)
b e f o r e i n s e r T
-
i n g T h e C o n n e C To 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
m P o r ta n t
: a
s s h i P P e D F r o m t h e F a c t o r y
,
t h e
a 1 5 0
c a n
D r i v e
a
s i n g l e
s
o n a n c e
b P s - 1
s
u b w o o F e r
. t
o
c o n n e c t
t w o
b P s - 1
s u b
-
w o o F e r s
,
s e e
s
P e a k e r
F
u s e
,
b e l o w
.
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.
2. using a flat-blade screwdriver, remove the s
peaker
f
use
hold-
er cap from the amplifier.
3. replace the 1.6a fuse in the s
peaker
f
use
holder cap with the
supplied 2.0a fuse and replace the cap in the s
peaker
f
use
holder.
4. Connect the two bps-1 subwoofers in parallel to the a150’s
s
ubwoofer
o
uTpuT
.
front panel features
P
ower
button
when the rear-panel a
uTo
o
n
switch is in the
OFF
position, the
p
ower
button turns the a150 on and off. if the a
uTo
o
n
switch
is in the
ON
position the p
ower
button will have no effect.
a
ctive
leD
The a
CTiVe
leD illuminates whenever the a150 is operating.
P
ower
leD
The p
ower
leD indicates that the a150 is connected to an
active power outlet.
b
yPass
switch
The b
Ypass
switch bypasses the a150’s internal crossover
network (f
requenCY
control) and the a150’s V
olume
control.
if you have connected the a150 to a surround receiver or
processor with a built-in subwoofer crossover, set the b
Ypass
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
i
-l
eVel
i
npuTs
, set the
b
Ypass
switch to the
OFF
position. The a150’s f
requenCY
and
V
olume
controls will function (see below).
F
requency
control
The f
requenCY
control adjusts the amplifier ’s internal
crossover between 40hz and 150hz. The crossover’s slope is
12db/octave. The higher you set the f
requenCY
control the
higher in frequency the bps-1 subwoofer will operate.
use the f
requenCY
control to achieve a smooth transition of bass
frequencies between the bps-1 subwoofer and your main speak-
ers. generally, the f
requenCY
control should be set at a lower
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
requenCY
control by ear, listen for the
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
requenCY
control setting; if the bass
seems too weak at certain frequencies (especially if your main
speakers have smaller woofers) try raising the f
requenCY
control
setting.
sonamp
®
a150 subwoofer amplifier
