Audio Systems: 70v PA System zone (on/off) question, question question, attenuator

Question
QUESTION: Hi!

I'm currently building a small PA system (70v / 60w total) for a friend and need your advice on one small aspect:

The system will have 2 different "zones" (ie. separate wiring from the amp). the first zone will have a 70v attenuator to control the volume but for the second, I just need on/off control. Now, this may sound like a stupid question but could I  just use a typical 120v on/off switch (SPST)... or do I absolutely need another 70v attenuator?

Thanks in advance! :)

ANSWER: Is this on/off for Zone 2 only or for the entire system? Also, so I don't set you on fire, can I get some pictures of the system?

---------- FOLLOW-UP ----------


PA diagram   QUESTION: LOL! :)

It's for zone 2 only. No pictures yet as I'm in the process of ordering the parts for the system but I've hand drawn a small diagram to show you what I mean. Oh, and the max. cable run will be about 250 feet.

Thanks for your help Kyle!
Simon

Answer
Actually, either will work. A simple on/off will work just fine. You may run into some issues with the circuit staying open though. Some amps get testy when you turn 1 zone off and still turn the other zone up or down. It may not happen but it is a possibility. If this becomes an issue, a mono 8 ohm volume control may be the better route. Good luck.