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ANOTHER speaker impedance question

 
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George
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Joined: 03 Jul 2009
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Location: UK

PostPosted: Wed May 25, 2016 6:11 pm    Post subject: ANOTHER speaker impedance question Reply with quote

my incoming new head can drive my 212 cab in 8 ohms series or 16ohms parallel to separate speakers. is there a tone difference or a more "correct" way of doing it?

id test this myself but i took the ohmage pcb switch thing out of the cabinet to sort out a grounding issue the fender mustang head had and now can't find it, so i can only do parallel at 16ohm per speaker
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Fakir Mustache
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Joined: 25 Sep 2013
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PostPosted: Wed May 25, 2016 7:34 pm    Post subject: Reply with quote

sorry, but that doesn't make any sense....

from the amp point of view, maybe, but from the cab point of view not really: if it does 16 ohms series, it'll do 4 ohms parallel if it is a 2x12" with 2 8 ohm speakers, unless you're talking about only connecting one 8 ohm speaker and leaving the other disconnected..

16ohm speakers in parallel = 8 ohms
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George
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PostPosted: Wed May 25, 2016 7:50 pm    Post subject: Reply with quote

you'll have to forgive me, i'm pretty ignorant with this stuff.

cab: 2 x 16ohm speakers, each with their own separate cable ports.

head: 2 x 16ohm speaker outputs



i take that to mean i can hook up using the 2 x 16 ohm connectors on the back?
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Fakir Mustache
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PostPosted: Thu May 26, 2016 6:10 am    Post subject: Reply with quote

No, it depends how many ohms the speaker cab is wired for.
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George
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PostPosted: Thu May 26, 2016 6:20 am    Post subject: Reply with quote

George wrote:
cab: 2 x 16ohm speakers, each with their own separate cable ports.


And they're not even on the same circuit
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NickS
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Joined: 14 Jan 2008
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PostPosted: Thu May 26, 2016 10:27 am    Post subject: Reply with quote

Sounds as though that's right. Test: Take one cable from the 16 ohm output to one of the connectors on the cabinet. Confirm that only one speaker is active.

If you've already opened the box and eyeballed (or other how know) that only one speaker connects to each jack socket, fine. Some cabinets have two sockets to provide a through connection to the expansion cab.
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George
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PostPosted: Thu May 26, 2016 10:36 am    Post subject: Reply with quote

thanks nick, the head manual states this regarding the two outputs:
Quote:
8 OHM Speaker Jack Use this to connect the Night Train to one 8 ohm Cabinet or two 16 ohm Cabinets. (Night Train 15C1 NOTE: If using a 16ohm extension cabinet, both the internal speaker and the external cabinet must be connected to the 8 ohm jacks)

this is the cabinet by the way: http://www.thomann.de/gb/harley_benton_g212_vintage.htm



so i'm presuming the 8 ohms mono setting is both 16ohm speakers in parallel, and the 16ohm stereo setting is both speakers completely separate from one another? this is academic at this point because i've lost the pcb bit off the backplate to be able to switch to mono, and the head isn't stereo out anyway. so really each speaker will count as cabinet 1 (16 ohm) and cabinet 2 (16 ohm) within the same box
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NickS
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PostPosted: Thu May 26, 2016 11:17 am    Post subject: Reply with quote

Yeah, you're good. Two cables from the "8 or 2x16" sockets on the amp to the two on the cab then.
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George
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PostPosted: Thu May 26, 2016 11:24 am    Post subject: Reply with quote

thanking you. good to know im not going to wreck my output transformer on day 1
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Doog
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PostPosted: Thu May 26, 2016 1:06 pm    Post subject: Reply with quote

New amp day ooooooh
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