Ashly MFA-6000 Bedieningshandleiding - Pagina 10

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1. Specifications

Operating Manual - MFA-8000 and MFA-6000 Power Amplifier

7.6

Speaker Outputs - Speakon Connectors

Neutrik Speakon connectors are provided to con-

nect with the Neutrik NL4FC 4-conductor plug. For the

channel 1 and 2 Speakon connectors, the following pin

assignment is used:

Pin 1+ = speaker hot

Pin 1- = speaker ground

The third Speakon connector in the center pro-

vides a stereo connection if operating in stereo mode or a

bridged connection if operating in bridged mode. The

pin assignment for this connector is:

Stereo Mode

Pin 1+ = Ch.1 hot

Pin 1- = Ch.1 ground

Pin 2+ = Ch.2 hot

Pin 2- = Ch.2 ground

INPUT OPTIONS

Input option panels are available to provide built-

in features such as a stereo compressor-limiter, a mic and

line mixer, a crossover for bi-amplified systems, and in-

put transformers for signal isolation. In addition to the

MFA amplifiers, all FTX MOS-FET amps, the CFT-1800

convection cooled amp, and P70 series 70 volt amps will

accept Ashly input option panels. A brief description of

currently stocked input options follows. Consult your

dealer for detailed information on input options, or call

the factory.

8.1

Input Isolation Transformer

The input isolation transformer can be installed

directly into the standard input supplied with every

ASHLY amplifier (except for the single rack space SRA-

120). The input transformer provides complete electrical

isolation from the amplifier and its signal source to elimi-

nate any ground-induced hum noise. The transformer in-

put also further reduces any common-mode noise and ra-

dio frequency interference. The transformer option is in-

stalled within the standard input panel and does not change

the operation of any switches or controls.

Bridged Mode

Speaker hot

Speaker return

8.2

Peak Limiter/Compressor

The limiter input option provides peak signal lim-

iting from excessive input levels for speaker protection

and overall level control. Separate limiter threshold con-

trols, limit indicator LED's and limit on/off switches are

provided on each channel allowing fully discrete stereo

limiting operation.

8.3

Two-Way Crossover

The crossover input option provides fixed-fre-

quency 24 dB/octave high-pass and low pass filters al-

lowing the two amplifier channels to operate bi-amped,

full range with low out, both channels low out, or bridged

low out. Auxiliary low and high outputs are available for

connecting additional amplifiers. Included with the cross-

over input option are single in-line package (SIP) resis-

tor networks which allow preselection between standard

crossover frequencies of 160Hz, 500Hz, 750Hz, 1.2KHz,

and 1.6KHz. 360 of phase control is provided for proper

acoustical alignment of high and low frequency drivers.

Selectable constant directivity horn EQ is provided for

both small and large horn designs.

8.4

Six Input Mic-Line Mixer

The mixer input option provides four high-im-

pedance line inputs and two balanced low-impedance mi-

crophone inputs, each with its own level control. A swit-

chable 200 Hz high-pass filter is provided on the mic in-

puts to reduce unwanted low frequency noise. An inter-

nal jumper allows selection of 15 Volt phantom power

applied to the mic inputs for use with condenser mics.

The option has a master level control and selectable ste-

reo, mono and bridging modes. Insert Points are avail-

able for patching external processing into the left and right

channels.