We recently began changing out some old Maxtrac radios to Mototrbo XPR4550 radios. Some vehicles were equipped with external speakers (8 ohm). Some were wired directly from the radio accy port to the speakers and some go thru a toggle switch that switched between the internal and external speaker on the Maxtrac radios (so the operator could turn the external speaker on of off via the switch).
The direct wire connections work great - both the internal and external speakers work fine. The problem came in when we cut the speaker inputs off of the Maxtrac connector and wired them to the XPR speaker + and - connections when the toggle switch was in the circuit. When the switch is in the closed position, the external and internal speaker on the XPR units are fine. However, toggling the switch to where the external speaker is seeing an open switch does indeed cut the external speaker off but it also distorts and lowers the audio on the internal radio speaker.
Anyone have any idea on what is going on here? I have some ideas to try but I wanted to get some more inputs from those who may have experienced similar problems swapping out older units without spending too much time trying to figure this out. Thanks.
The direct wire connections work great - both the internal and external speakers work fine. The problem came in when we cut the speaker inputs off of the Maxtrac connector and wired them to the XPR speaker + and - connections when the toggle switch was in the circuit. When the switch is in the closed position, the external and internal speaker on the XPR units are fine. However, toggling the switch to where the external speaker is seeing an open switch does indeed cut the external speaker off but it also distorts and lowers the audio on the internal radio speaker.
Anyone have any idea on what is going on here? I have some ideas to try but I wanted to get some more inputs from those who may have experienced similar problems swapping out older units without spending too much time trying to figure this out. Thanks.
