Bogen WV150 - Manual (Page 8)

Connections
Speakers
Transformer-Coupled Speaker Connections
Transformer-coupled, constant voltage speaker loads are connected to their respective load type (i.e., 70V
speakers to the 70V terminal, 25V speaker systems to the 25V terminals) and the COM terminal. Make sure
the selector switch is in the TRANS position. A separate 8-ohm terminal is provided to drive 8-ohm
(low-impedance) speakers through an output transformer tap.
The speaker terminals can accept up to a #10 spade lug and have integral clamping plates that make wiring
easier.
4-Ohm Low-Impedance Speaker Connections
A low-impedance (4
Ω) speaker load can be driven directly (without transformer coupling) by connecting the
load to the 4
Ω terminal and the GND terminal. Make sure the selector switch is in the DIR position.
Bypassing the output transformer and driving the speaker load directly provides the advantage of better bass
response. To maximize the power delivered to the speakers, their combined load impedance should be 4 ohms.
Connecting higher load impedances is electrically acceptable, but the mismatch in load impedance will cause the
speaker load to only receive a portion of the power that the amplifier is capable of delivering. It is not
acceptable to connect low-impedance speakers to the 70V and 25V outputs.
Note jumper link shorting the
GND to the COM terminal.
Typical connections to a low-impedance
(non-transformer-coupled) speaker load Typical connections to a 70V
transformer-coupled speaker
Note switch is
set to DIR
Note switch is
set to TRANS
6
Note jumper link shorting the
GND to the COM terminal.