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Post by cellar on Apr 15, 2020 12:43:51 GMT -7
How would I connect a 4ohm speaker load to the Nova back panel? I have an internal speaker and external speaker output.
Thanks!
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Post by doctorice on Apr 15, 2020 16:02:05 GMT -7
I don't think you should do this. The NOVA manual implies that the amp expects a total 4-ohm load when two speakers are plugged in, one in each output jack. The implication is that the amp speaker outputs are set up for parallel operation. If you use an 8-ohm and a 4-ohm in parallel the combined load is under 3 ohms, which has potential to damage the transformer.
You could connect the 4-ohm speaker in series with the 8-ohm using a special speaker cable. That will make a 12-ohm load and the amp will be OK with that plugged into the internal speaker jack. (Todd, PCNS here on Z Talk, can make one of these for you; he has a discount for Z Talk members. Highly recommended for all your cable needs.)
Another approach is to purchase an impedance matcher that sits between the amp output and your speaker(s). Weber used to make one.
Enjoy your NOVA. It's a great amp.
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Post by cellar on Apr 15, 2020 18:39:30 GMT -7
Thanks for the input. I am loving the nova! Ok let me see if I understand. One 8ohm (or a little higher) load connected to one of the outputs or two 8 ohm loads 1 per each speaker output. However, it is not safe to connect one 4 ohm load to the two speaker outputs combined in parallel?
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Post by Jaguarguy (Mike) on Apr 15, 2020 19:18:44 GMT -7
You can not use more than one speaker output at a time (hopefully that is not what you were thinking of doing)!
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Post by cellar on Apr 16, 2020 0:11:18 GMT -7
The manual reads: 14. External Speaker Jack: This allows you to use an external speaker cabinet if your NOVA is a combo model. Connect an 8 ohm extension speaker for a parallel load of 4 ohm. If your NOVA is a head model, this will allow you to use a second 8 ohm speaker cab in parallel with your first 8 ohm speaker cab for a total load of 4 ohm. Use the Internal Jack if connecting your NOVA head model to only one 8 ohm speaker cab. Regardless of model, always have a speaker plugged into the amp when it is powered on.
Ok, then I must be dense, because I am not sure what this means.
Thanks for your input.
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Post by KeithA on Apr 16, 2020 3:48:37 GMT -7
The manual reads: 14. External Speaker Jack: This allows you to use an external speaker cabinet if your NOVA is a combo model. Connect an 8 ohm extension speaker for a parallel load of 4 ohm. If your NOVA is a head model, this will allow you to use a second 8 ohm speaker cab in parallel with your first 8 ohm speaker cab for a total load of 4 ohm. Use the Internal Jack if connecting your NOVA head model to only one 8 ohm speaker cab. Regardless of model, always have a speaker plugged into the amp when it is powered on. Ok, then I must be dense, because I am not sure what this means. Thanks for your input. I read it the same way you do in that you can connect a second cab as long as its 8 ohms (which means doctorice's explanation of why hooking up a 4 ohm cab is a no-no). Based on what I read the external 8 ohm cab will give the 4 ohm parallel load limit. Maybe we are both reading it wrong
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Post by cellar on Apr 16, 2020 4:02:29 GMT -7
Thanks KeithA!
This states that
Output Impedance = 8 Ohm, 4 Ohm with extension speaker out
This makes me think the External Speaker Output is for a 4 ohm load.
Or maybe that is in conjunction with the Internal Speaker Output.
But I am not sure and I would like to be SURE.
Thanks to everyone for your help!
It appears this the same configuration with the CURE, NOVA, and Z-MASTER.
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Post by KeithA on Apr 16, 2020 4:14:45 GMT -7
Thanks KeithA!
This states that
Output Impedance = 8 Ohm, 4 Ohm with extension speaker out
This makes me think the External Speaker Output is for a 4 ohm load.
Or maybe that is in conjunction with the Internal Speaker Output.
But I am not sure and I would like to be SURE.
Thanks to everyone for your help!
It appears this the same configuration with the CURE, NOVA, and Z-MASTER.
I think it's in conjunction with the internal speaker output. Maybe if Doc sees this he'll chime in so you can hear straight from the horse's mouth. Normally this would mean a quick email to the Z shop but, unfortunately, World events are wreaking havoc right now.
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Post by daddyelmis (Greg) on Apr 16, 2020 4:39:05 GMT -7
I don’t own a Nova, but my reading of the manual seems to mean the Nova’s outs are like the white Brakelite - it’s an “automatic” parallel connection so you can just add the 2nd 8ohm speaker and the outputs then see 4ohms. So you don’t unplug the internal speaker at all.
However, I could be wrong. 🥴
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Post by cellar on Apr 16, 2020 4:41:40 GMT -7
Thanks! I would have just sent an email but, with the shop closed, I though I would ask here.
At least I am not the only one that is not sure.
I will await an answer from the good Doc.
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Post by KeithA on Apr 16, 2020 4:45:14 GMT -7
I don’t own a Nova, but my reading of the manual seems to mean the Nova’s outs are like the white Brakelite - it’s an “automatic” parallel connection so you can just add the 2nd 8ohm speaker and the outputs then see 4ohms. So you don’t unplug the internal speaker at all. However, I could be wrong. 🥴 I think you are right
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Post by cellar on Apr 16, 2020 5:15:38 GMT -7
I didn't think about them automatically being in parallel. So, I just did a quick check. The multimeter confirms that both the internal and external outputs are wired in parallel.
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Post by pcns on Apr 16, 2020 5:16:19 GMT -7
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Post by DRZ on Apr 16, 2020 5:16:26 GMT -7
Thanks! I would have just sent an email but, with the shop closed, I though I would ask here.
At least I am not the only one that is not sure.
I will await an answer from the good Doc.
You can only use an 8 ohm extension speaker in the external jack, simple as that on the Nova. That will parallel the total load the amp sees to 4 ohms. You can not connect a 4 ohm load to the Nova's External jack. That is exactly what the manual states , I can't say it any easier to understand. Z
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Post by cellar on Apr 16, 2020 5:35:48 GMT -7
Thanks! I would have just sent an email but, with the shop closed, I though I would ask here.
At least I am not the only one that is not sure.
I will await an answer from the good Doc.
You can only use an 8 ohm extension speaker in the external jack, simple as that on the Nova. That will parallel the total load the amp sees to 4 ohms. You can not connect a 4 ohm load to the Nova's External jack. That is exactly what the manual states , I can't say it any easier to understand. Z OK!
So one 8ohm connected to the Internal (amp sees 8 ohms)
Or one 8 ohm connected to the External (amp sees 8 ohms)
or 8 ohm connected to both Internal and External (amp sees 4 ohms) Thank you Doc!
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Post by doctorice on Apr 16, 2020 7:54:37 GMT -7
Dr Z confirmed my original response. Good to know I wasn't making it up
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Post by KeithA on Apr 16, 2020 8:01:15 GMT -7
Dr Z confirmed my original response. Good to know I wasn't making it up We knew you were good
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