Written while I was writing:
On August 7, 2017 at 12:37, Brad Humphrey said...
The TPD you are referring to is for 4/8 ohm systems. Of special note: the clamping voltage is 100VRMS.
You need to call TPD and check if that module will work on a 70v system. The audio signal rides on that 70v line so peak voltage can be well above 100v in use.
If you're going to speak of RMS, you have to speak only of RMS; the same goes for peak. The peak of a sine wave is 1.414 times its RMS value.
The peak voltage of a 70V sine wave is 98.98. The peak voltage of 100V RMS is 141.4 volts. This says that a 70V system should not cause the TPD to activate. SHOULD is not a good engineering term, though!
I'm willing to bet that TPD module can NOT be used on a 70v system. When you go to crank up the system, the TPD module will shunt, sending the amp into protect mode.
But again, call and check - if it can't, they may have a part number they sell that does do what you need.
