Crown Audio STUDIO AMPLIFIER Reset Switch, Do not use the channel 2 input in either mono mode

Studio Reference I & II Professional Studio Amplifiers

Fig. 2.2 Rear Facilities

I. Reset Switch

This back panel switch can be used to trip and reset the AC mains circuit breaker (see Section 4.3.4).

J. Power Cord

For 120 VAC, 60 Hz North American units, the Studio Reference I includes a 10 AWG power cord and NEMA TT30P plug, and the Studio Reference II includes a 12 AWG cord and NEMA 5-15P plug. Other units are shipped with an appropriate power cord and plug.

K. P.I.P. Module

The standard P.I.P.-FX input module is provided with your amplifier. It provides female XLR input connectors. Each pair of XLR and phone jack connectors is wired in parallel so the unused connector can be used as a “daisy chain” output to connect a source to multiple am- plifiers. Other P.I.P. modules can be used in place of the P.I.P.-FX to provide additional features that customize your amplifier for different applications (see Section 8 for available P.I.P. modules).

L. Balanced XLR Inputs

A balanced three-pin female XLR connector is provided on the P.I.P.-FX (K) for input to each channel. Caution:

Do not use the channel 2 input in either mono mode.

M. Output Connectors

Two pairs of versatile 5-way binding posts are provided for the output of each channel so multiple loudspeakers can be connected easily. They accept banana plugs, spade lugs or bare wire.

N. Stereo / Mono Switch

This switch is used to select one of three operating modes. Stereo mode is used for normal two-channel operation, Bridge-Mono mode is used to drive a single channel with a load impedance of at least 4 ohms, and Parallel-Mono mode is used to drive a single channel with a load impedance of less than 4 ohms. WARNING:

Turn off the amplifier before changing this switch (see Section 3.3).

O. Balanced Phone Jack Inputs

A balanced 1¦4-inch phone jack is provided for input to each channel. They may be used with either balanced (tip, ring and sleeve) or unbalanced (tip and sleeve) in- put wiring (see Section 3.3). These inputs are in parallel with the P.I.P. connector, so they should not be used as inputs if the installed P.I.P. has active circuitry. Caution:

Do not use the channel 2 input in either mono mode.

P. Ground Lift Switch

The input signal ground may be isolated from the AC ground with this switch to help prevent unwanted ground loops. It affects only the phone jacks (O). It has no affect on the P.I.P. module’s XLR connectors. Activat- ing the switch inserts an impedance between the sleeve of each phone input jack and the circuit ground.

❑Input Sensitivity Switch

The three-position input sensitivity switch inside the am- plifier can be accessed by removing the P.I.P. module. Settings include 0.775 volts and 1.4 volts for rated out- put, and 26 dB voltage gain (see Section 4.4).

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