The Digitrax SP10188 is a 10 x 18mm oval 8 ohm speaker - the shape that solves N scale sound installs. An oval fits the long, narrow space along the top of an N scale shell or inside a tender where a round speaker of the same area simply will not go, and it ships with interface wires already attached.
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Why choose an oval speaker over a round one?
Shape. N scale shells and small steam boilers give you a long narrow cavity, not a circle. An oval uses that space, so you get more cone area than a round speaker that has to fit the narrow dimension.
Will it work with my sound decoder?
Any DCC sound decoder rated for an 8 ohm speaker output. Check the decoder manual - if it specifies 32 ohms, you need a 32 ohm speaker instead.
Do I need a baffle?
It makes a large difference at this size. Sealing the back of the cone is what produces the bass; without it the front and rear waves cancel and the sound goes thin and tinny.
Is there a bigger option for HO?
Yes. If the shell has room, a 28mm round or one of the rectangular box speakers with an enclosure will give you noticeably more volume and low end.
