Bass loss hits hard when the crowd’s out in the open. Get the sub under a ground mat or a small berm—any barrier will trap the low waves and let them feel the room instead of blowing out into the sky. Throw a few bass‑reinforced speakers on a low‑angle line‑array and keep the sub’s power low‑end boost to the level the wind can’t drown.

Echo is the next beast. Position your main drivers on a staggered, angled array so the sound fronts face the audience, not the horizon. Add a reflector or a lightweight panel on the back wall if you have one—just enough to absorb the bounce. Keep the stage area clear of large metal objects that could scatter the wave front.

Drop the EQ a touch—cut the mid‑highs where the air absorbs and boost the 60–100 Hz band before the driver. Keep the compressor’s release tight to avoid echoing tails, and use a low‑pass on the monitor mix to protect the crew’s ears from the extra high‑frequency spill.

Finally, do a proper soundcheck with a mobile PA that includes a line‑array. Check the mix at the edge of the crowd, tweak the delay on the rear speakers, and trust your headphones for real‑time monitoring. Once the low‑end sits and the front is tight, the outdoor stage turns into a stadium, not a canyon.