Loudspeaker impedance

[netdudeuk]

Hi

We're going to build a retro radio and the design calls for an LT700 transformer (secondary is 3.2 ohms) and a three ohm speaker.  However, every small speaker on eBay is at least eight ohms.  Would one of those be ok ?

Thanks

[SeanB]

It will work, and will be slightly softer but works well.

[netdudeuk]

Thanks for the quick reply.  Any value in adding a resister in parallel to get it nearer three ohms ?

[SeanB]

No real value, it will work with any speaker from 2R to 16R with no problems. The speaker impedance is in any case going to vary with frequency as well.

[netdudeuk]

Thanks Sean. Ordered.

[IanB]

Maybe too late now, but 4 ohm speakers might be found from some sources (perhaps intended for car audio use?)