Name: Paul Fanning
Email: madbones@earthlink.net
Subject: series or parallel?
Thread: 57
Time: Sun, 15 Jul 2001 19:33:18 UTC
I'm not sure about the later series of amps, but the original 65/130 models have the extension jack wired in SERIES (not parallel as your reply suggests). My 210HD-130 has two 8ohm speakers wired in parallel, so the proper setting without an extension speaker is the 4ohm setting. When I plug in a 4ohm cabinet to the extension jack, the two 4ohm loads in SERIES create an 8ohm load, so the switch goes in that position. The various comments saying that mismatched impedances are harmful to an amp SHOULD be taken seriously. You may not notice much difference in the sound at the moment, but there are long-term effects that could make you VERY unhappy when you lunch a hard-to-find output transformer!