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You can use either 2 or 4 speakers of any appropriate 8 ohm model with the Tsunami..AHD hb-1 or otherwise.  I have Tsunamis having 1, 2 and 4 installed.  There is no doubt that you will improve the sound by driving more speakers.  Just be sure to follow the wiring diagram provided in all Tsunami products and on the Sountraxx website for the proper wiring of the speakers. Two speakers may be wired in series to achieve 16 ohms...which will sound better than one but you may want to turn down the volume somewhat as you have halved the impedence in the circuit.Do not wire them incorrectly to 4 ohms or you will eventually damage the decoder.  You may wire four 8 ohm speakers in series/parallel to achieve 8 ohms, but probably won't have the space for this in any tender.  I have mine in an experimental "sound car" box car that is connected via miniconnectors to various locos as needed.BTW, you will not need to purchase a capacitor for the speakers as one is provided, wired into the decoder already.
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