Garage speaker system


Distinguished Member
Ignore the 'nominal' ohm figure. There no such thing as 4 ohm speakers because impedance changes depending on frequency. Most good amps are designed to play 4 to 16 ohms.
They're easy to drive compared to some other speakers advertised as 6 or 8 ohms nominal.

My Dali opticons are advertised as 4 ohm nominal but they don't drop below 4 ohms. They are 4 to 11.5 depending on the frequency. The 11.5ohms is around 70 hz.

Here is an impedence curve:

View attachment 1666378

You can get 8 ohm nominally rated speakers that drop to below 4 ohms.

Are you looking to have 2 pairs of speakers?
Yup my 8ohm drop to 2.9. The tweeters crap out when it comes to machine made 'noise'.


Active Member
Is nominal another word for average? I read somewhere that Dali rubicons dont dip below 4. I just plugged my dali ceiling speakers into the integrated amp.
Blue Monday by new order sounded crap, but George Benson sounded pretty good. The sound was similar to the Bose acoustic wave jobbie in the kitchen, but the Bose had better bass.
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No, nominal isn't the same as average.

The nominal is advertised by the manufacturer, some manufacturers will advertise their speakers as 8 ohm nominal as a marketing ploy when 6 ohms nominal is more accurate. Some also give a minimum and some will give a range (eg Canton)

There is a standard but manufacturers can advertise their speakers as anything they like. To be 8 ohm nominal, it means for a proportion of the time the impedance must be at least 8 ohms.

i would take ohms and rated watts with a pinch of salt. They're tested in house. Just like a car manufacturer's fuel consumption rated figures, they're tested in house.


Active Member
That's a good point. I love how they're out if the way and that was what I'm trying to achieve, wrongly.
I'm gonna get a pair of Rubicon 2 and be done with it. Thanks for everyone's input.

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