IMPEDANCE MEGATHREAD FAQ

[pocaloc]

I think you all have me to thank, in part, for this handy thead. I've been all over his ass with annoying questions. Thanks for being such a helpful/knowledgable resource.

[zhivago]

I'm not sure how to change privileges specific to the forum, so I just made the edit for you, Brad

great writeup, by the way

[pocaloc]

When I tested the 70's bandmaster reverb that I just bought on my 16 ohm 1x12 cabinet, it was very quiet, and you could smell it heating up. When I brought it to a local store and tested it on his 4 ohm '65 Bandmaster 2x12 cabinet, I think with Oxford speakers, it almost blew the roof off and didn't seem to be heating up. So that 4 to 16 ohm difference really affected the amp.

[jimboyogi]

Great work Brad, an excellent write-up.

Is this a good place for information on power sharing in a multi-speaker array? If you have 4 speakers wired in 2 series pairs, then each pair paralleled, what proportion of the total power does each speaker see?

[Dave]

Is my recent Traynor thread the straw that broke the camel's back?

[i love sharin foo]

There's some ghost in the machine right now making it impossible for members to edit posts. Jay said he'll have a crack at sorting it as soon as he has some time.

PS, thanks for another superb write up Brad!

[andrewdoeshair]

All this knowledge is giving me a raging brainer.

[Professor Plum]

All this knowledge is giving me a raging brainer.

[Dave]

Brad, can you include some info about choosing the right speakers in terms of wattage? Do you add up all of the wattage ratings on all speakers being used to determine a proper amount?

[sookwinder]

Fender amps have a shorting jack on their speaker outputs for this reason-- If the speaker comes unplugged, it shorts the output transformer secondary, which will 'buy you some time' until you figure out that there's no speaker connected.

This is something I had not realised. When I went and looked at the schematics, I can now see the shorting jack (other than on the VC schematic - the VC has a RCA plug)

Thanks Brad for doing this thread.

[jimboyogi]

Cheers, thanks Brad

[noisepunk]

Okay, curiosity question:

In terms of sound, is there any audible difference between lower impedance wired upwards (higher impedance) and high impedance wired downward?

I.E. 2 2ohm speakers wired for 4ohms vs. two 8ohm speakers...

[noisepunk]

Hmm. Well thanks for answering anyway, maybe something to test sometime if I have the chance.