Manual Samson D-3500 (page 10 of 28) (English)

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D3500 Quick-start

Quick start –

Using the D3500 to Reduce Feedback

The D3500 is a powerful 30 band, fully parametric equal-

izer with onboard loudspeaker processing effects. Each

of the 30 filters can be manually set and all the effects

parameters can be adjusted and stored into memory.

However, if you want to use the D3500 as a simple auto-

matic feedback management system, you can. First, lets

look at some basic concepts to employ that will help

reduce the chance of feedback before you even power up

the D3500.

Microphone Positioning - How to Reduce Feedback

Feedback is the annoying howling and squealing that is

heard when the microphone gets too close to the speaker

and the volume is high. You get feedback when the micro-

phone picks up the amplified signal from the speaker, and

then amplifies through the speaker again, and then picks

it up again, and so on and so on. In general, it is always

recommended that any LIVE mic (a mic that’s on) is posi-

tioned behind the speaker enclosures. This will give you

the best level from your system before feedback. One

possible exception is when you are adjusting the sounds

of the microphones, since you want to listen in front of the

speaker to hear properly. To do this, lower the PA system' s

main volume while setting the EQ and effects from in front

of the speakers. Once you have the sound you like, move

the microphones to behind the speakers and raise the

Main volume. In addition, be aware of your microphone's

pick up pattern. For most live sound applications, a uni-

directional or Cardioid microphone with great rear rejec-

tion is the best solution for getting the most gain before

feedback.

Looking for a great dynamic mic with above aver-

age feedback rejection? Try a Samson Q7.

Speaker Placement

Whenever possible, it is a good idea to raise the speakers

above the heads of the listening audience. Any good loud-

speaker, like the Samson dB500, Expedition, or Resound

model enclosures, feature a standard 1 3/8” pole mount

receptacle, which is compatible with speaker stands from

a variety of manufacturers (including the Samson TA100).

Position your speakers for the best audience coverage, but

be aware of where your live mics will be during the course

of your performance or presentation and position the

speakers in front of the live stage area.

Using the D3500 for Automatic Feedback Managemet

The following example is for reducing feedback in a typi-

cal PA system used by a band in a small to medium size

club using the D3500. First you’ll set ten of the filters to

RESONANCE mode to remove problem frequencies that

occur due to microphone and monitor placement, as well

as those caused by room acoustics. When the filters are set

to Resonance the

D3500

will detect a feedback problem,

then set automatically the filter to the feedback frequency,

and then lock on that frequency until it is reset or a new

program is preset loaded. After setting the RESONANCE fil-

ter, you’ll set some additional filters to DYNAMIC mode to

handle feedback problems that occur from artists moving

around on stage with their microphones. When the filter is

set to DYNAMIC mode, it will search for feedback and then

lock on that frequency until the feedback problem goes

away. If the filter set to DYNAMIC senses that the feed-

back problem is no longer present, it will begin to search

for new feedback problems. So, by setting some filters to

Resonance and some to Dynamic, you can easily handle

feedback problems from speaker and mic placement, as

well as from presenters and performers moving around

with live mics. Simply follow these basic steps and start

getting a louder mix without feedback.

•

sing standard XLR cables, c

onnect the output of your

mixer to the D3500's rear panel XLR INPUT connectors.

•

Now, run another set of XLR cables and plug the D3500's

rear panel XLR OUTPUT's to your power amp or active

speaker inputs.

Note: If you are using any other signal processors like a

graphic equalizer or compressor, put the D3500 after them in

the signal path.

• Power up your system as normal.

•

Press the D3500's LINK switch so that the green LED

lights, indicating the left and right channels are linked

together.

•

Press the BYPASS switch so that the LED is off, indicating

the D3500’s digital processing effects are engaged.

•

You’ll probably want to start with a default preset, so

press the LOAD switch. The LED will flash indicating the

D3500 is ready to load a preset.

•

Use the Data Wheel to select Preset 00 and press LOAD.

•

Now, select the first ten filters by pressing and holding

the Channel 1 Filter Select Switch, and then press the

Channel 10 Filter Select Switch. At this point you will

notice that the green Selection LEDs for the filters 1 – 10

are lit. This indicates that the filters are ready to be set-

up and engaged.

•

To set these filters to RESONANCE mode press the EQ

switch until MODE is displayed in the main LCD.

• Use the Data Wheel to select Mode 3; (RESONANCE).

D3500_ownman_v1_2.indd 8 9/4/05 5:20:06 PM

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Samson D-3500 Manual

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