Mark III tone tip...

[boogiemon]

I've found that plugging into one of the 4 ohm jacks in back instead of the 8 ohm Jack takes some of the harshness out of the gain channel, at least at lower volumes. Ymmv

 

[fishyfishfish]

Will do.

 

[MrMarkIII]

Yup. It's my "wedding gig" go-to. :lol:

 

[boogiemon]

:lol:

Yup. It's my "wedding gig" go-to. :lol:

 

[emperor_black]

but isnt the 4 ohms jacks to be used when there are two 8 ohm cabs? I have a 8 ohm stereo cab. I connect the two 4 ohms jack to the cab. I noticed that even though its a 16 ohm cab, when I checked using a multimeter, the end of the speaker cable was reading only 14 ohms. that means in stereo, each jack was reading around 7 ohms. That's one of the reasons I use two speaker cables.

 

[boogiemon]

the total load seen by both 4ohm jacks should be >= 4ohms. The jacks are wired in parallel so If you've got two 8 ohm cabs, the total load is ~4ohms. If you've got one 8 ohm cab, the load is still >= 4 ohms so you're ok.

g'luck.

but isnt the 4 ohms jacks to be used when there are two 8 ohm cabs? I have a 8 ohm stereo cab. I connect the two 4 ohms jack to the cab. I noticed that even though its a 16 ohm cab, when I checked using a multimeter, the end of the speaker cable was reading only 14 ohms. that means in stereo, each jack was reading around 7 ohms. That's one of the reasons I use two speaker cables.

 

[tony777]

I noticed that even though its a 16 ohm cab, when I checked using a multimeter, the end of the speaker cable was reading only 14 ohms. that means in stereo, each jack was reading around 7 ohms. That's one of the reasons I use two speaker cables.

A multimeter shows DC resistance, not impedance, that's why you get a lower result.

 

[boogiemon]

That's cool, i never knew that. What's the relationship be tween the two? How would one measure impedance?

I noticed that even though its a 16 ohm cab, when I checked using a multimeter, the end of the speaker cable was reading only 14 ohms. that means in stereo, each jack was reading around 7 ohms. That's one of the reasons I use two speaker cables.

A multimeter shows DC resistance, not impedance, that's why you get a lower result.

 

[emperor_black]

That's cool, i never knew that. What's the relationship be tween the two? How would one measure impedance?

Recollecting from 'electrical engineering 101' from my B.S, I think the best way to think about the difference is, resistance is to DC as impedance is to AC. I should have realized it. I cant measure impedance with a multimeter.

 

[igfraso]

I've found that plugging into one of the 4 ohm jacks in back instead of the 8 ohm Jack takes some of the harshness out of the gain channel, at least at lower volumes. Ymmv

If you have a 60/100 watt amp and you want to make it sound closer to a SimulClass amp, you run the amp in 100 watt and plug the 8 ohm speaker into one of the 4 ohm jacks.

 

[frets70]

This is an interesting "techie" question, I thought impedance is a measure of the overall opposition of a circuit to current, in other words: how much the circuit impedes the flow of current

And resistance is a describing term stating that the circuit or component has a property or characteristic that resists the flow of electrons.

And then isn't the current through the speaker cable in a DC form?

 

[chipaudette]

There should be no DC current flow through the speaker. The output transformer should only transfer AC power from the power tubes to the speaker.

Chip