Bedienungsanleitung Samson D-2500 (Seite 25 von 32) (Englisch)

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• Now run your mic, MP3, or CD player signal, press

RTA on the D1500 and check the LCD Meters on

the D1500.

• While the D1500 is set to RTA, you may need to

adjust the GAIN to set the reference point of the

display.

Once you confirm that the system is operating normally

and that the RTA can read the system response with the

test mic, you can move ahead and generate the Pink Noise

to help you flatten the system.

• Connect the D1500 Left and Right Outputs to a pair of

inputs on your mixing console.

• Now make sure that the input gain controls and faders

on the inputs on your mixers have the D1500 outputs

connected and turned up to about 0dB.

• Press the GEN switch on the D1500.

• To change the operating

level

reference scale press the

REF switch and use the Data Wheel to make the change.

• To be extra safe with your gear (this may get really loud!

really!), start with a very low signal level by selecting the

GAIN switch and turning the Data Wheel counter-clock-

wise all the way to –98dB.

• Next, press the SOURCE switch and turn the Data Wheel

until the display reads: SRC: PINK.

• To turn up the Pink Noise signal, make sure that GEN is

still selected and then press the GAIN switch and turn

the Data Wheel clockwise until your hear the level of the

pink Noise get about as loud as the system was when

you played your mic, MP3, or CD player signal,

• Now, press the RTA switch and you should see the vari-

ous frequency meters bouncing along.

If the LED meters read very low on the display, or the you

don’tsee them at all, you will need to do one, or a combi-

nation, of the following:

1 Press Global and use the data wheel to select MG (Mic

Gain). Next, turn the Data Wheel clockwise to increase

the Mic Gain in 10 dB steps. Press the STORE switch to

accept the change. Repeat this step until the LED indica-

tors are operating in a range approximately halfway up

the display.

2 Press the RTA switch and then the GAIN switch. Turn the

Data Wheel clockwise until the LED indicators are oper-

ating in a range approximately halfway up the display.

Operating the D2500 with the D1500 RTA

Using the signal Generator

The D 1500’s internal Signal Generator can be used

to produce Pink Noise, White Noise or a tunable Sine

Wave.

You can use the Generator for a variety of applica-

tions including using the Pink Noise signal to flatten

the response curve of a speaker system with an ana-

log equalizer, or using the Sine Wave to output a sine

wave for tuning a crossover at a specific frequency.

Before you get started using the Generator, press and

hold the GEN switch for about two seconds and take

notice of the parameters that can be adjusted while

using the Generator. You’ll notice that the SOURCE,

GAIN, REF and FREQ are illuminated indicating that

these parameters can be edited.

The following example outlines a typical application

for using the D1500’s RTA and Pink Noise Generator

to flatten a loudspeaker system in a small to medium

size venue using a traditional analog graphic equal-

izer.

• Connect your mixer, equalizer and power amplifiers

as you normally would and confirm that you have

normal output by play

ing a signal like that from a

mic, MP3, or CD player. It’s a

good idea to set the

system to the same

level that you will be ultimately

using during normal operation. Once you get the

system up and running mute the mic/MP3/CD, but

keep set up so you can use it to set the measure-

ment mic level.

• Connect a measurement microphone like the

Samson MM01 to the D1500 rear panel MIC INPUT.

Place the microphone on a stand and position it

about ear level, approximately 3 meters, or 10 feet,

from your speaker.

Note:

The proper spot to position the measurement

microphone will vary depending on the size of the

space the loudspeaker system is operating in.

• Press the Global switch once or twice until you see

Inp in the LCD display, then select Mic and press

STORE

• Press Global again, and use the Data Wheel to set a

Mic Gain of +20 dB to start. Press STORE. You may

need to adjust the

Mic

GAIN up or down depend-

ing on your exact situation.

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