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Post by zroach on Jun 2, 2007 20:00:19 GMT -7
My Maz 18 head has outputs for 4 and 8 ohms (as they all do). Let's say I have two identical speaker cabinets except one is wired to run at 4 ohms and one is wired to run at 8 ohms. Will there be any difference in tone? What about power? I'd like to buy another cabinet soon and wasn't sure whether to buy and 4 or 8 ohm. Any help would be appreciated. thanks.
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Post by Hohn on Jun 6, 2007 10:10:16 GMT -7
Part of me says there would have to be a difference based on my reasoning, but I can't really hear any difference at all that's worth considering when I switch cab impedance. I attribute any tone difference to the fact that my 1x12 is just a Blue, while my 2x12 is a Blue/EVM setup.
jh
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Post by rhythmeister on Jun 6, 2007 11:15:00 GMT -7
I don't know the answer, but I do know that there was a prior thread on this on this Board, with all the theories explored and discussed. I think the Doc himself contributed on that thread.
Cheers, Blair
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Post by flem on Jun 6, 2007 15:20:33 GMT -7
I know some people prefer to use the 8 ohm out into their 16 ohm 412 cabs. I could never figure out why, but there must be some reason. Only logical reason I can think of is it makes the amp work a little harder and maybe sound a little more cranked? I think I'm going to look for the original thread on this. Lol I asked that question on page 9 in this forum channel, the consensus was not much of a change, anyway take a look at page 9 Impedance matching for tone" only i spelled matching wrong oops. Here's the link zroach, sorry I'm not all that computer literate, I'm sure theres an easier way to link but I mine as well just cut, paste and modify for now. drzamplifiers.proboards41.com/index.cgi?board=cabs&action=display&thread=1125008496&page=1#1125008496
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Post by zroach on Jun 6, 2007 15:34:16 GMT -7
If you find the original post a link to it here, would ya? I haven't been able to find it.
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Post by hdahs143 on Jun 6, 2007 19:52:16 GMT -7
Post the question in Ted Weber's column in the "Ask the Experts" thread. He'll give you a detailed answer.
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Post by zroach on Jun 6, 2007 20:12:45 GMT -7
Thanks for the link, flem!
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Post by Matt H. on Jun 7, 2007 10:26:38 GMT -7
I have a Ghia 2x10 - When I use it 8 Ohm - it is quite a bit louder with more headroom and less compressed than the 4 Ohm output. I find that at home, I like 4 Ohm's and when rehearsing I prefer the 8 Ohm's. I don't think the tonal qualities of the amp change all that much, but it definitely seems cleaner to me at the 8 Ohm setting. Well, that's how my amatuer ears hear it -
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Post by dixiechicken on Jun 12, 2007 3:38:08 GMT -7
Yes there is an electrical difference. I forget the exact effects, though.
The "impedance load/speaker load" on the output "tranny" secondary side - will affect the current flowing through the primary side and thus affect how the output tubes runs. In a worst case scenario it can affect the relation between grid/plate voltages and the bias point in the output tubes. It can in rare cases cause havoc.
Better safe than sorry, would be my advice. Use the impedance switch/outputs if there is that option on your amp.
Generally speaking tube amplifiers are more forgiving for varying impedance loads compared to solid state amplifiers. Still play it safe, I'd say.
I would surmise the god DR has thought of this while designing his amps, so to follow his "lead" - seems a proper course of action.
Cheers: Dixiechicken
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