PYLE Audio PCM20A - Manual (Page 5)

SPEAKER CONNECTION
One or more speakers (4, 8 or 16 Ohms) can be connected to the amplifier with or
without transformers. However, before you connect any speakers to the amplifier, the
total impedance must be calculated in order to avoid damage to the amplifier. A total
speaker impedance greater than 8 Ohms or less than 8 Ohms can cause this damage
to occur.
SYSTEM 2 : Two (or more) Speakers in Series
NOTE : Connect the speaker (+) to the amplifier's 8-Ohm terminal, depending on the
TOTAL IMPEDANCE of the two speakers. If each speaker has an impedance
of 4-Ohm, the total speaker impedance in this series configuration is 8 ohms.
Pyle Home PCM20A Manual - 4
SYSTEM 1 : Single Speaker System
NOTE : Connect the speaker (+) to the amplifier's 8-Ohm terminal.