HIGH-Z INPUT JACKS (8)
Two parallel i/4” 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 l/4” 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 shorti/4” 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 l/4” 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 l/4” jack can also be used creating an unbalanced input.
HIGH OUT CROSSOVER JACKS (9)
These output jacks are provided for crossover capability. With the crossover switch depressed, the low- frequency signal is automatically routed to Channel A. The high-frequency signal has to be patched to the input of Channel 6 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 2-way system.
SPEAKER OUTPUTS (10)
Two l/4” jacks and 5way 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 l/4” 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.
AC LINE CORD-120 V products only (11)
All the PV Series power amplifiers are fitted with a single, heavy-duty 3-conductor line A 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. Never break off the ground pin on any equipment. It is
provided for your safety.
The use of extension cords should be avoided but, if necessary, always use a three-wire type with at least a #I 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.
CROSSOVER SWITCH (12)
This switch is used to select the crossover capability of this amplifier. With this button depressed, the low frequecies 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.
SUB-SONIC FILTER (13)
Depressing this switch to the ‘<in” 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 dB per octave.
INSTALLATION AND CONNECTION
The PV professional series of power amplifiers is designed for durability in commercial installations and has the quality of perfomance 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.
