Centralized audio applications   
4.16  EST3 Installation and Service Manual 
OUT PRE-AMP = Low level audio to audio power amplifier 
input. 
3-ATPINT jumper settings 
Refer to Figure 4-9. 
 
Table 4-6: 3-ATPINT jumper settings 
Input / Voltage  Jumper setting 
Pre-Amp #1, 70 Vrms  P1 = 1/2 
Pre-Amp #1, 25 Vrms  P1 = 2/3 
Pre-Amp #2, 70 Vrms  P2 = 1/2 
Pre-Amp #2, 25 Vrms  P1 = 2/3