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Digitrax SP13138, 8 Ohm Speaker for Digitrax Sound Decoders -- Round 13mm Shipping_Pickup Only It’s a great introduction toDetails: Round 13mm 8 Ohm Speaker with wires. Fits many N & HO Scale installations. Used on current production SDN144K0A and SDN144K1E sound decoders. Digitrax recommends the use of a baffle or speaker enclosure for maximum sound output when using this speaker.