Lectrosonics SPN812 User Manual download pdf (Page 6)

SPN Mixers

LECTROSONICS, INC.

Introduction

The ASPEN digital matrix provides a maximum of 48

total outputs, but there is no limit to the number of in-

puts that can be added to a system by stacking multiple

units. Input only units deliver outputs to the digital bus,

so they are always used with a host mixer or confer-

ence unit to provide physical audio outputs.

ASPEN Series mixers are built around two “building

block” board assemblies. One is an 8 in/12 out mixer,

and the other is a 16 channel input only design. These

two building blocks are combined in various conﬁgura-

tions to create various processor models:

• SPN8128input,12outputmixer,1RU

• SPN161216input,12outputmixer,2RU

• SPN162416input,24outputmixer,2RU

• SPN241224input,12outputmixer,2RU

Input only processor models include:

• SPN16i16channels,1RU

• SPN32i32channels,2RU

Other processor models include:

• SPNConferenceteleconferenceInterface,1RU

• SPNDNTDantenetworkinterface,1RU*

All models fully support the 48 outputs provided by the

digital matrix, regardless of how many physical outputs

are present on the rear panel. Any physical output can

deliver the signal from any output in the matrix.

Every input includes a dynamic noise reduction ﬁlter to

enhance dynamic signals and suppress steady state

noise. This unique algorithm is a single ended, frequen-

cy selective process that signiﬁcantly reduces noise

from one or multiple sources.

When multiple units are stacked, Master and Slave

units are automatically detected and conﬁgured. All

data and audio from the Slave units in the system is

gathered in the Master, so a single connection between

a computer and the Master allows access to all units in

the stack. The throughput latency of all audio inputs in a

stack is automatically synchronized to maintain abso-

lute signal phase at the audio outputs.

Quick Start Essential

Settings

Install the ASPEN Software before connecting

the processor to the computer USB port.

Wiring and Cable Connections

All inputs, outputs and control devices must be securely

connected following the pinouts and polarity shown on

pages 7 thru 9.

Interconnect Multiple Units

When multiple units are used, interconnect them via the

ASPEN ports on the rear panels. (see page 9)

Critical Settings for Mixer Models

Several settings must be made before the processor will

pass signals correctly:

• Inputlevelsmustbeset

• Crosspointsmustbedened

• Outputlevelsmustbeset

The settings can be made using the computer interface

or with the LCD. (see pages 10 and 16)

Special Settings for SPN Conference

If the sound system includes an SPN Conference pro-

cessor, two of the ﬁnal mixes must be used to generate

the input signals for the AEC (acoustic echo canceller)

and another mix must be routed to the telephone send

connection. Details for this critical setting are included

in the Installation Guide for the SPN Conference.

Signal Processing

Audio quality is signiﬁcantly improved by using the vari-

ous signal processing functions included in all channels.

There is no “gas gauge” and no limitation of DSP re-

sources regardless of how many processes and stages

are enabled.

Every input channel includes settings for:

• Delay

• Noisereductionlter

• Equalization

• ADFE(autodigitalfeedbackeliminator)

• Compressor

Every output channel includes settings for:

• Delay

• Equalization

• Compressor

• Limiter

*SPNPower12 is to be developed at a future date

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