Two parallel
stereo input jacks are provided for each channel. This allows one to be used as a
conventional input and, simultaneously, the other to be used as a “line out” (Y-cord) to connect to
another input jack on this amplifier or other amps or equipment. These
jacks are not chassis
grounded and will provide a unique ground loop elimination circuitry associated with each input. This
feature will normally allow “hum-free” operation when relatively short
cable patches are made
between the jacks on this amp and other jacks on various other equipment that share the same rack
with this amp. The inputs are true electronically balanced to further eliminate any hum. A
stereo
jack can be used at the input with the tip being the positive phase, the ring being the negative phase
and the sleeve connected to ground. A mono
jack can also be used creating an unbalanced input.
These output jacks are provided for crossover capability. With the crossover switch depressed, the
frequency signal is automatically routed to Channel A. The high-frequency signal has to be patched to
the input of Channel from this jack. If both channels are being used for the lows, (either Bridge mode
or Stereo) then the HI OUT jacks can be connected to another amplifier to provide the highs in a
system.
Two
jacks and
binding post speaker output terminals are provided for each
A
channel. Again, for each channel, these outputs are in parallel; hence, the speaker
connection cables can be terminated with
phone plugs, banana plugs, or stripped
wires for use in the binding post terminals. For sustained high power applications, the
use of the binding post terminals is recommended. However, care must be exercised to
assure correct speaker phasing.
A
All the PV Series power amplifiers are fitted with a single, heavy-duty
line
cord and a conventional AC plug with a ground pin. It should be connected to an inde-
pendent circuit capable of supporting at least 15 amps or greater continuously. This is
particularly critical for sustained high power applications. If the socket used does not
have a ground pin, a suitable ground lift adaptor should be used and the third wire
grounded properly.
The use of extension cords should be avoided but, if necessary, always use a three-wire type with at
least a 4 AWG wire size. The use of lighter wire will severely limit the power capability of this power
amplifier. Always use a qualified electrician to install any new electrical equipment. To prevent the risk
of shock or fire hazard, always be sure that the amplifier is properly grounded.
This switch is used to select the crossover capability of this amplifier. With this button depressed, the
low
are automatically sent to the corresponding channel. The high frequencies are sent to
the HI OUT jack, which can be connected to either the other channel’s input or another amplifier. The
crossover frequency is fixed at 150 Hz.
Depressing this switch to the
position provides a 40 Hz high-pass filter for the corresponding
channel. This will cut ultra-low frequencies, protecting speakers from the possibility of over-excursion.
The low-frequency roll-off is 18
per octave.
The PV professional series of power amplifiers is designed for durability in commercial installations and
has the quality of
required in studio and home applications. These units are a standard
rack-mount configuration height, and each is cooled by an automatic two-speed internal fan. All input
and output connections are on the back panel. Additionally, the level controls, selector switches and the
resetable circuit breakers are on the back panel. The front panel contains LED indicators for power and
DDT activation and the main power switch.
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