Name: Steve Kennedy
Email: steve@pacair.com
Subject: 21-65 Ohms
Thread: 214
Time: Sun, 21 Oct 2001 23:04:44 UTC
Is that a 210-65 you are referring to?
Anyway, it will depend on what speakers you have (regardless of model). If you measure your speakers individually (disconnect one wire) with an ohm meter, you will see approximately 6 ohms for an 8-ohm speaker and about 3 ohms for a 4-ohm speaker.
Assuming both are the same measurement, then do the following:
If both are 8 ohms and wired in parallel (4 ohms total), then set the switch for 4 ohms. If they are wired in series (for 16 ohms total), then set the amp for 8 ohms.
If they are 4-ohm drivers, wire them in series (for 8 ohms total) and set the amp for 8-ohms.
The amp can tolerate up to 100% mismatch in impedance, but the total cannot be less than 4 ohms.
If possible, you want the amp to have an 8-ohm load with its internal speakers so you can plug in an external 8-ohm cabinet. When you do this, you put the internal and external speakers in parallel, so in this case you would switch the switch to the 4 -ohm position when using an external cabinet.
I will try to add a section to the web site with drawings and charts showing this info so it is clearer in the future.
Steve