I know this has been asked before - ohm question

[Securb]

So if I have a 16-ohm head and an 8-ohm cab what are my options. And is there a way to wire up four 8-ohm speakers for 16 ohms?

 

[Demanic]

Re: I know this has been asked before - ohm question

That's a tough one.

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[chadd]

Re: I know this has been asked before - ohm question

If you have two output jacks, you cold do two 16 ohm pairs

 

[Demanic]

Re: I know this has been asked before - ohm question

That's like trying to wire up 4 16ohm for 8.

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[Securb]

Re: I know this has been asked before - ohm question

If you have two output jacks, you cold do two 16 ohm pairs

There are two 16 ohm outputs on the amp what are you suggesting?

 

[IM4Tone]

Re: I know this has been asked before - ohm question

Limited options:
1) Use the mismatch. Probably no harm, but it's best to follow the mfg's recommendations....what do they advise?
2) Two speakers only in series ==>16 ohms
3) Buy one of THESE. It's less $$$ than 4 new speakers.

 

[jeremy]

Re: I know this has been asked before - ohm question

what is the head in question?

 

[GoldenVulture]

Re: I know this has been asked before - ohm question

So if I have a 16-ohm head and an 8-ohm cab what are my options. And is there a way to wire up four 8-ohm speakers for 16 ohms?

Originally Posted by chadd If you have two output jacks, you cold do two 16 ohm pairs
There are two 16 ohm outputs on the amp what are you suggesting?

Wire the cabinet for stereo, Viz: two pairs of 8 ohms in series . MY quad box is wired similarly to that plus a mono option for the lot @ 8 ohms.[center jack ]

 

[GoldenVulture]

Re: I know this has been asked before - ohm question

Here's a marshal setup.

 

[chadd]

Re: I know this has been asked before - ohm question

Viz: two pairs of 8 ohms in series .

That's exactly what I would do. Wire up two pairs just like the top left diagram in this image.

 

[Demanic]

Re: I know this has been asked before - ohm question

Two pairs in parallel? That won't give you 16 ohms total.

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[IM4Tone]

Re: I know this has been asked before - ohm question

Two pairs in parallel? That won't give you 16 ohms total.

Right. This thread had me confused at first, until the following clarification was made (which must have been while I was typing my first response).

There are two 16 ohm outputs on the amp what are you suggesting?

So the initial post stating the amp was 16 ohms was misleading. It obviously is 8 ohm (via 2 parallel 16 ohm inputs) I think?

 

[SlyFoxx]

Re: I know this has been asked before - ohm question

If you're not pushing the amp balls out the mismatch shouldn't be any problem to any decently designed amp.

 

[Securb]

Re: I know this has been asked before - ohm question

There are two 16 ohm outputs on the amp. I want to avoid wiring it for stereo because I would have to hack a vintage plate on the back of the cab. The head is a AMPEG B-25b.

 

[IM4Tone]

Re: I know this has been asked before - ohm question

Check the schematic from the output transformer and based on it either:
1) Make a Y speaker cable and place the two plugs into both of the amp's jacks, the other end into the 8 ohm cab.
OR
2) Place a 'blank' plug (no wires attached) in the amp's jack 1 and run a speaker cable from jack 2 to the 8 ohm cab.

 

[GoldenVulture]

Re: I know this has been asked before - ohm question

There are two 16 ohm outputs on the amp. I want to avoid wiring it for stereo because I would have to hack a vintage plate on the back of the cab. The head is a AMPEG B-25b.

Apparently.

The extension speaker jack opens up the 8 ohm tap.

No need to rewire your cabinet.
The schematic confirms this. - http://www.classictubeamps.com/schematics/Ampeg/Ampeg B25B schematic.pdf -