Speaker Connections; Speaker Impedance - Yamaha P2500S Owner's Manual

I Speaker impedance
Speakers can be connected to the amplifier as shown below. Note that speaker impedance will vary according to the connection method and
the number of speakers. Please be sure that your speakers
Connection configurations for STEREO
and PARALLEL modes
When using 5-way binding post output jacks
STEREO BRIDGE PARALLEL
or
STEREO BRIDGE PARALLEL
When using Speakon connector
3 2
+ 1 +
-
1 -
Minimum
speaker
impedance:
4 Ω
When using phone jack
3 2
+ 1 +
- 1 -

Speaker Connections

'
1 1
- + + -
(-) (+)
BRIDGE
Minimum
Minimum
speaker
speaker
impedance:
impedance:
4 Ω
4 Ω
SPEAKERS
2 3
1 + +
1 - -
2 + +
2 - -
SPEAKERS
2 3
1 + +
1 - -
2 + +
2 - -
Minimum
speaker
impedance:
4 Ω
impedance is not less than the relevant minimum value indicated below.
Connection configurations for BRIDGE
mode
When using 5-way binding post output jacks
STEREO BRIDGE PARALLEL
When using Speakon connector
3
+ 1 +
- 1 -
1
- + +
(-) (+)
BRIDGE
Minimum
speaker
impedance:
8 Ω
SPEAKERS
2 2 3
1 + +
1 - -
+ +
2
2 - -
Minimum
speaker
impedance:
8 Ω
1
-
9