Digitrax SP53188B | Rectangular 53mm x 18mm x 14mm 8 Ohm Box Speaker with enclosure | Multi Scale

The Digitrax SP53188B is the big one - a 53 x 18 x 14mm 8 ohm speaker in a sealed enclosure, with roughly four times the cone area of a compact box speaker. Where there is room for it, in an HO long hood, a large tender, or anything O and G scale, it is the difference between a locomotive you can hear and one you can feel.

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• 53 x 18 x 14mm enclosure - the largest of the Digitrax box speakers, with the cone area and internal volume to produce genuine low end.
• Sealed enclosure included. No scratch-building a baffle from styrene; the acoustic work is already done.
• 8 ohm, 1/2 watt - matches the speaker output on most DCC sound decoders.
• Interface wires pre-attached for soldering straight to the decoder speaker pads.
• Measure first: at just over 2 in. long and more than half an inch deep, this needs a long hood, a tender, or an O scale frame. For tighter installs use the 26.5 x 15.5 x 9mm SP26158B.

Will this fit in an HO locomotive?
In a diesel long hood or a decent-sized steam tender, usually yes - it needs about 2-1/8 in. of length, 3/4 in. of width and 9/16 in. of depth. In a short switcher or a boiler, it will not. Measure before ordering, or step down to the SP26158B.

Is it really that much louder than a compact speaker?
Yes. Cone area and enclosure volume are what produce bass and output, and this has far more of both. It is the single biggest upgrade you can make to a sound install that has room for it.

Do I need 8 ohm or 32 ohm?
Check your decoder manual. Most DCC sound decoders drive 8 ohms, which is this speaker. If yours specifies 32 ohms, order the Digitrax SP531832B - the same speaker and box in a 32 ohm version.

Does it come with a plug?
No, it has bare interface wires for soldering to the decoder. If you need a plug-in speaker, the Digitrax SP26158BC has a 2-pin plug, though it is the smaller box.