Aspen SPNTWB, Installation And Startup Manual

SPNTWB

LECTROSONICS, INC.

8

Audio Inputs – Unbalanced

Unbalanced audio sources include items such as 

consumer VCR’s, DVD players, etc., which can be con-

nected with either two wire or three wire cables. The (+) 

terminal of the source is connected to the (+) terminal 

of the processor. The shield and (–) connections are 

made as shown here.
Three wire cables should have the shield connected to 

the (–) connector at the source end of the cable.

Processor

Unbalanced source to 

ASPEN input – 3-wire cable

Source

Shield

Two wire cables should have a jumper between the 

processor (–) input and ground.

Processor

Unbalanced source to 

ASPEN input – 2-wire cable

Source

Shield

Audio Inputs – Balanced

Balanced audio sources connect to the processor in-

puts in a straight “pin to pin” configuration.

Processor

Balanced source to 

ASPEN input

Source

Shield

Installing the chassis into a rack

Install the chassis so that the cooling fan vent is not 

blocked.  Mount with 4 rack screws using the appropri-

ate mounting holes.  Use nylon washers to prevent 

damage to the front panel’s finish when tightening the 

mounting screws.
All ASPEN processors have internal switching power 

supplies that can tolerate voltages ranging from 100 

to 240 VAC. Use an approved power cord with an IEC 

60320 C13 connector.

Cables 

It is recommended to use lacing bars for cable strain 

relief when mounting in a rack. Use only professional 

audio cable with proper shielding – typically, two con-

ductor plus ground/shield.

Audio Connectors 

The analog audio inputs and outputs are connected 

through 5 pin de-pluggable connectors. Strip the insula-

tion back 1/8 to 3/16” but do not tin (apply solder to) 

the leads. Insert the wire into a de-pluggable connec-

tor, leaving less than 1 mm of bare wire exposed, then 

tighten the retaining screw.

Caution: Do not overtighten the screws.

5-pin depluggable 

connector

Do not leave more than 

1 mm of exposed wire 

beyond the connector.

Do not apply  

solder to leads

Retaining Screw

(Do not overtighten)

Note the labeling on the rear panel for the positive and 

negative leads.  Ground is shared between two connec-

tions (the center pin).

Note: ASPEN processors do not have a “pin 1 

problem.”  Inputs and outputs are true differential 

connections.

Hardware Installation