If you are referring to DCC sound decoders, these are not a matter of
scale. Any sound decoder will do. You have room for larger speakers on
an O scale loco than an HO loco, which means higher wattage, so make
sure the decoder can handle the extra current.
Generally speakers have an ohms rating of 8 or possibly 4 ohms, whatever
their physical size. A 300mm speaker will have the same ohms rating as a
Greater volume is achieved by increasing the output voltage of the
amplifier. (see ohms law)
As a teenager I connected up a pocket transistor radio to our band
speaker stacks arranged so that I had 16x 12" speakers in parallel and
series still totalling 8 ohms - it sounded much better!
The limit comes when the amplifier power exceeds the handling capacity
of the speaker, something that happens very quickly with a minimum sized
Check Phoenix but after you see the prices you may think again.
Theyalso really push the term "DCC compliant". Of course I'm not sure
which DCC they are talking about. If I remember correctly they only support
a very few CVs!
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