All SoundTraxx speakers are 8 ohms. As a general rule, we recommend installing the largest speaker that will fit in your model for the best sound. You also can use Tsunami's built-in 7-band equalizer (see Below) to optimize the speaker frequencies.
Speaker measurements are from the edge of the frame, not the cone size. Inches provided are nominal.
More about Tsunami's built-in 7-band equalizer
Tsunami’s 7-band Equalizer (EQ) allows you to fine-tune sounds to create distinct locomotive “personalities,” and optimize the speaker’s frequency response to enhance your favorite sounds. Using the EQ, you can cut and boost sound levels by +/- 12dB over seven selected frequency ranges!