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AUDIO FORUMS >> General Discussion and Support >> 15ohm speakers on Mini Torii
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Message started by chalun823 on 04/01/15 at 07:32:48

Title: 15ohm speakers on Mini Torii
Post by chalun823 on 04/01/15 at 07:32:48

Hi Decware community!

I am thinking about running a pair of Lowther drivers @ 15ohm on the mini torii. Other than the amp not providing full power, are there other drawbacks?

Or...should I not worry about it and just go ahead?

Thanks guys!

Title: Re: 15ohm speakers on Mini Torii
Post by SteveC on 04/01/15 at 08:07:17

From my very simplistic electronics understanding:

less resistance/ohms means more current flow > burns up wires too small to handle the current.

more resistance/ohms means less current (less sound too) > no problem. should be the same as adding a resistor in series with a "normal" speaker.

Now I have no idea if parts of a tube are affected by seeing higher resistance on the output. Does some part of a tube get hotter because fewer electrons are flowing? don't know. don't think so. plus the output transformers are in the way, scaling the change somewhat.

99% sure you'll be fine.

Title: Re: 15ohm speakers on Mini Torii
Post by Fireblade on 04/01/15 at 13:10:15

I know the Mini Torii maxes out in power at 8 Ohms nominal Impedance. Anything below or above it, brings it into an exponential decreasing curve in power. So, you are right, the power (SPL) will suffer, ceteris paribus.

I'm not familiar enough with the topic to comment on possible side effects other than power, but I bet the Mini Torii can go all the way to 16 Ohms, without trouble.

There is a special transformer for the Mini that is apt for using it with speaker impedances over 8 Ohms (as opposed to the std 2 - 8 Ohm offering), which I think would suit the Mini much better in these circumstances. I would ask Steve about that possibility or reconsider the speakers choice.

Good luck!