The Digitrax SP13138 is a 13mm round 8 ohm speaker for the tightest sound installs. At just over half an inch across it drops into N scale shells, tenders and small HO hoods where a 28mm speaker will never fit, and it ships with interface wires already attached so there is nothing to solder at the speaker end.
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Will this speaker work with my sound decoder?
Yes, as long as the decoder drives an 8 ohm load. Check your decoder manual for the rated speaker impedance - a decoder that specifies 32 ohms needs a 32 ohm speaker instead, such as the Digitrax SP282832.
Do I really need a baffle or enclosure?
It makes a large difference. A bare speaker cone lets front and back waves cancel each other, which kills the bass. A sealed box - even one you fold from sheet styrene - will noticeably improve volume and tone.
Can I wire two of these to one decoder?
Two 8 ohm speakers in series give 16 ohms, which is safe for most decoders. Wiring them in parallel drops the load to 4 ohms and can damage the decoder, so check the manual before doubling up.
Does it come with a plug?
No. The SP13138 has bare interface wires. If you want a speaker that plugs straight into a compatible motherboard, look at the Digitrax SP26158BC with its 2-pin plug.
