Epifani ps400 Guida Utente

Tao of Impedance, Ohmmm (Ω = Ohms) –  
When connecting speaker cabinets to an 
amplifier, it is important not to exceed the 
minimum impedance for which the amplifier is 
rated.  The PS400 bass head has a minimum 
impedance rating of 4Ω.  If the impedance of all 
speaker cabinets connected to the amplifier is 
less than 4Ω, it will cause the amplifier to 
overheat.  When combining speaker cabinets, 
use the following chart to determine the 
impedance of the combined cabinets. 

Speaker Cables, Resistance Is Futile – For 
best results use speaker cables that are 16-
gauge or lower.  For cable lengths longer than 
25 feet, use 14-gauge or 12-gauge cable.  A 

lower number means the cable is thicker and 
produces less resistance which means better 
low-frequency transmission to the cabinets. 

Donʼt Phase Me Bro! – When using multiple 
cabinets, be sure they are all in ʻphaseʼ.  If you 
connect two cabinets to your amplifier and notice 
a lack of bass response, most likely one of the 
cabinets is out of phase.  This means its 
speakers are moving the opposite direction of 
the other speakers causing the sound waves 
from each cabinet to cancel each other out. You 
can readily notice this when a single cabinet has 
more bass and better response than when two 
are connected. Hereʼs how to verify phase. Take 
a ¼” cable. Insert one side into a cabinet and 
touch the other tip of the ¼” jack to the “+” of a 9-
volt battery and the shaft to the “-” of the battery. 
If all speakers move forward they are in phase.  
If any of the speakers move backwards, they are 
out of phase, The problem can be easily 
corrected by a speaker technician.

1. Tweeter Level – Three-way switch attenuates 

the output level of the tweeter.  Set to HI for 
maximum volume, NORM for moderate 
volume or OFF to disable the tweeter. 

2. Speaker Input/Output – ¼” TS Phone jacks 

wired in parallel.  Use only unshielded 16-
gauge or lower speaker cable to connect your 
amplifierʼs speaker output to either jack.  Use 
the other jack to daisy-chain an additional 
cabinet.