Acoustic treatment can be a helpful addition to any room where you plan to listen to music or use speakers. It can help to improve the sound quality of your speakers by reducing reflections and other sound distortions in the room. There are several types of acoustic treatments that you might consider using in your DIY speaker build project, including:

1. Bass traps: These are designed to absorb low frequency sounds, which can help to reduce bass buildup and improve the overall clarity of the sound.
2. Sound diffusers: These are designed to scatter sound waves in different directions, which can help to reduce reflections and improve the overall sound quality of the room.
3. Absorption panels: These are designed to absorb sound waves, which can help to reduce reflections and improve the clarity of the sound.
4. Ceiling tiles: These can be used to absorb sound waves and improve the overall sound quality of the room.

It's important to note that the specific acoustic treatment that you choose will depend on the specific needs of your room and your goals for the sound quality. You may want to consult with an acoustics expert or do some research to determine the best treatment options for your project.