Sound for an Athearn SW1500

[cnw1961]

i would like to do the same to one of my SW9's but the speakers are too large i have seen to fit in.

If your P2K SW9 looks the same as my old SW9, then the LokSound 16 x 25 mm (.640" x 1") speaker I used on my SW1500 would fit perfectly above the front truck if you’d remove (or modify) the weight. Whether you can find a place to put the decoder is still another question ...