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Confused as fuck about impedance.
Posted: Sun Feb 24, 2008 8:50 pm
by Reece
I've been look at some small tube combos for when I go to uni, but I also want to be able to plug the combo into my PPC112 when I'm at home. The PPC112 is rated at 16 ohms.
After reading up about impedance, I am now completely and utterly confused about what I could safely plug into it, can someone explain impedance matching in thick terms, since I'm now worried I'm fucking up my TT?
Posted: Sun Feb 24, 2008 11:29 pm
by Sloan
MAKE SURE THE RATING ON THE AMP IS EQUAL TO OR HIGHER THAN THE RATING ON THE CABINET.
ex:
16ohm amp > 16/8/4/2 ohm cab
8ohm amp > 8/4/2 ohm cab
4ohm amp > 4/2 ohm cab
2ohm amp > 2 ohm cab
Posted: Sun Feb 24, 2008 11:31 pm
by Sloan
16ohm cab is weird to me.
I guess it's a Vintage 30 rated at 16ohms?
Posted: Sun Feb 24, 2008 11:40 pm
by Doog
Sloan wrote:MAKE SURE THE RATING ON THE AMP IS EQUAL TO OR HIGHER THAN THE RATING ON THE CABINET.
ex:
16ohm amp > 16/8/4/2 ohm cab
8ohm amp > 8/4/2 ohm cab
4ohm amp > 4/2 ohm cab
2ohm amp > 2 ohm cab
NOOOOOOOOOO
The amp's impedance should me the same or LOWER than the cabinet's.
Posted: Sun Feb 24, 2008 11:53 pm
by Reece
Doog wrote:Sloan wrote:MAKE SURE THE RATING ON THE AMP IS EQUAL TO OR HIGHER THAN THE RATING ON THE CABINET.
ex:
16ohm amp > 16/8/4/2 ohm cab
8ohm amp > 8/4/2 ohm cab
4ohm amp > 4/2 ohm cab
2ohm amp > 2 ohm cab
NOOOOOOOOOO
The amp's impedance should me the same or LOWER than the cabinet's.
Does trust doog more than slon.
Means I haven't been fucking up my TT then, tis all good.
Posted: Mon Feb 25, 2008 12:22 am
by mickie08
Doog wrote:Sloan wrote:MAKE SURE THE RATING ON THE AMP IS EQUAL TO OR HIGHER THAN THE RATING ON THE CABINET.
ex:
16ohm amp > 16/8/4/2 ohm cab
8ohm amp > 8/4/2 ohm cab
4ohm amp > 4/2 ohm cab
2ohm amp > 2 ohm cab
NOOOOOOOOOO
The amp's impedance should me the same or LOWER than the cabinet's.
+1
Posted: Mon Feb 25, 2008 2:24 am
by Sloan
hhaha.
the post right after that i actually changed.
it originally stated that i probably fucked it up. lolz.
Posted: Mon Feb 25, 2008 4:07 am
by Hugogamelas
Sloan wrote:MAKE SURE THE RATING ON THE AMP IS EQUAL TO OR HIGHER THAN THE RATING ON THE CABINET.
ex:
16ohm amp > 16/8/4/2 ohm cab
8ohm amp > 8/4/2 ohm cab
4ohm amp > 4/2 ohm cab
2ohm amp > 2 ohm cab
This is wrong, its the other way round.
You should never plug into cabs with lower impedance than the minimum suported by the amp.
Posted: Mon Feb 25, 2008 8:48 am
by Mike
Actually it's never really safe to mismatch impedance either way. I posted fucking SCIENCE everywhere the last time Doog said lower was OK and it was ignored.
http://www.shortscale.org/forum/viewtopic.php?t=13794
Match if you can.
If you mismatch you're basically stressing the transformer - good transformer means no worries, a cheap or poor one = problems.
Small mismatches are generally fine in either direction. For example 8 ohm cab // 16 ohm cab = 5.33 ohms. Use the 4 ohm socket.
Just use you TT 16 ohm output.
Posted: Mon Feb 25, 2008 1:44 pm
by Bacchus
Buy an epiphone valve junior head, and sell the TT to me.
Otherwise, it'll probably blow up, like.
It's the only sensible option.
Posted: Mon Feb 25, 2008 2:04 pm
by Doog
Pffffft. What do you know, with all your "electronics degrees", "applied learning", "fancy word books" and "sitdown brunches"..
Posted: Mon Feb 25, 2008 2:16 pm
by Mike
I thought you said "Sitdown wees" then for a second. I was all like HOW DOES HE KNOW?
Posted: Mon Feb 25, 2008 2:30 pm
by Doog
HAHAHA
Luxury pisses ftw.
Posted: Mon Feb 25, 2008 3:29 pm
by Sloan
I SIT DOWN WHEN I PEE
THERE AIN'T NOTHING THAT CRAZY BOUT ME
I'M JUST TAKIN A WHIZZ, MIND YOUR OWN BIZ
WHY IS EVERYBODY ALWAYS LOOKIN' AT ME?!!!