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Cabinet Placement
:
Your ULD
subwooler
operates primarily
at
Irequencies
below
8S
Hz.
Due to
the nondirec-
tionality of these frequencies.
it is
not
necessary
to
place
the
subwoofer
equidistant
from
each
of
the
satellite
speakers
. Note. howeve r. that frequency
response
and
output
level
ca
n
be
greatly
influenced by
placement.
depending
on the
acoustic variables
of the room. Typically
.
the
subwoofer
will sound
louder next
to
a
wall or
in
a
corner.
Due to the
strength
of the magnet
in the
ULD driver it is
recommended
that the
un
it
be placed
at
least
4
teet
trom
any
television or other magnet-sensitive
device
such as
a
computer
disk drive
.
Adjusting
Level Control:
Once you
have selected the proper location tor
your ULD subwooter
you will
want
to
balance the
overall
output
at your
system.
We
recommend
that you begin
with
the
subwoofer
level
set to
mini-
mum
. Play seve ral selections
of
mus
ic and
bring
th
e
subwooter
level
up until
the
bass outpu
t
matches
the
mids
and highs
to
your satisfaction.
You
will
notice that
th
is
takes some
experimentation,
especially
it
you are
stand ing
next
to
the subwooter
while
making
the
adjustments.
Once you
set
the subwoofer level. the
proportion of
bass
to midrange and treble
outpul
will remain conslant.
The Velodyne controller may
be
used
to
tine
tune
the bass
output
if
desired
.
Crossover
Modification
: Your
ULD
subwoofer
has an active crossover
network.
Both
the
high
and low
pass
filters
are
set for
8S
Hz
and
feature
12
dB
slopes.
Wh
ile
either
crossove
r
point
may
be
raised
or lowered by your
dealer
at
a
nominal charge
.
we
feel
that the
factory preset
is
the opt
imum
crossover
for most applications
.
Ins
tallation
of
Crossover/Bypass
Option
:
For
audioph
iles
who
prefer a
passive
high
pass
crossover,
Velodyne
offers an accessory
unit
which
includes
a
6
dB per
octave
crossover
as
well
as
a
subwooter
bypass
switch
.
The
bypass
func
tion
allows you
to
play your
main
speakers full
range without the
su
bwoofer.
Figure
2 shows how
to
connect
your
ULD-15/18 with the
Crossover/Bypass.
Contact
your Veladyne dealer
for add
itional
information
regarding
th
is
accessory
(Velodyne part
number
80-1 10FI
N).
PRE-AMP
POWER AMP
SOURCE INPUTS
PRE
·AMP
OUTPUTS
POWER AMP INPUTS
R
L
0000
A
);,
000
0
'-S..~
,
,
CROSSOVER
/
B~
l
_
I
}
POWER
SERVO CONTROLLER
EXTERNAL
ELE~
)
RL
tic!
FROM fORE
·AM
P
10 !'OWER AMP
II
FROM
TO
POWE
PRE AM
AM
P
FUSES
SERVO
~
~
0
117 VAC
INTER-
""
""
FUSE
50
I
GO
HZ
FACE
7
AMPS
MA
X
0000
CAUTION
:
TO
SATELLITE
SPEAKERS
(AS
IN FIG
1)
ULD-
15/18 SERIES
II
POWER
SE
RVO CONTROLLER
I
t+=
CONNECT SPEAKER
SPEAKER
LEADS RED
TO
RED.
_
" _'D _'
_
_
_
'_
" '
_
CI< TO
BLACK
f
-
--t--==
Figure
2: Connection
using
Crossover
/
Bypass Accessory
25'
SHIELDED
PHONOCABLE
-
3-
IQ)
UNDERSIDE
OF
ULD·15/1S
CABINET
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