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Speaker Connections; Placement - HP Barney Oliver Manual

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Installation
The phono cartridge should be located
is convenient from any transformers, motors, or
as
other source of AC magnetic field. With proper
installation and
a good cartridge, no AC hum
should be audible even at the full setting of the
volume control and with bass boost.
B.
USE
OF PHONOG RAPH PICKUPS OTHER
THAN SHURE V15 TYPE II
The
phonograph
pre-amplifiers
optimized for the Shure V15 Type II pickup.
are
Other good quality pickups can be used, but a
resistor change on each of the phono pre-amp
boards may be required. The resistors in question
are
designated R1 as shown near the left side of
the
pre-amp
schematic in
determine the optimum value for R1 for a given
pickup, the inductance and resistance of the pick­
up must be known. The value for resistor R1 may
then be calculated by using the following equation:
L
6
IR
x 10
- 100 R
1
.75
Where
L o is pickup inductance in Henries, R o is
pickup
internal resistance in ohms, and R 1 is in
ohms.
Once the value for R1 has been calculated
R1 resistors on each of the two phono pre-am
boards
should be changed to the proper value. For
additional information, see Section V, A.
LEFT SPEAKER
3-2
far
as
shipped
as
Section
VI,
A.
To
- 20K
o
p
\
\
BISECTOR
\
\
\
\
\
\
\
, ' .
\
The Barney Oliver Audio Amplifier
C.
SPEAKER CONNECTIOI\lS
The amplifier
may be located at any con­
venient distance from the loudspeakers. Twisted
pairs of No. 18 wire or larger or ordinary zip-cord
may be used to connect the amplifiers to the
speakers if the distance is under 100 feet. For
longer distances, heavier conductors are recom­
mended.
In
general
the
cables
or
cords
should not exceed 5% of the
speaker impedance.
Connection to the amplifier outputs is via
the two-terminal polarized Jones sockets at the
rear of the amplifier. The cords or cables must be
soldered to the mating plugs provided, taking care
to avoid internal short circuits from wire strands
or solder bridges. It is good practice to insulate
the wire and lugs from each other with electrical
tape
or heat shrinkable tubing inside the plug
sleeve after soldering.
D.
SPEAKER PLACEMENT
The loudspeakers should be located at the
ends of the base of an isosceles triangle with the
listener at the apex. The apex angle of this tri­
angle, i.e., the angle between the lines of sight
to the two speakers should be about 150 to 450
as shown in Figure 2. Good sound quality wil
then be heard up to 45 0 on either side of the
perpendicular
bisector of the line between the
speakers.
RIGHT SPEAKER
d-c
resistance
of
the
l
Figure 2.

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