Here are a few key points on how the size of the exciter can be adjusted to potentially improve the sound quality of DML speakers:
- Using a larger exciter generally provides better bass extension and output capability. This can help fill in the lack of deep bass that is a common issue with DML speakers[1][2].
- However, an oversized exciter can overdrive a smaller panel causing distortion. Proper matching of exciter size to panel dimensions is important[2][3].
- Smaller exciters allow more placement flexibility on a panel to find the optimal position to evenly excite resonance modes. But they may lack power[1][4].
- Using multiple small exciters can equal the output of one larger exciter if properly spaced. This maintains flexibility while increasing power handling[1][3].
- The exciter size affects the dispersion pattern, with larger sizes providing more consistent coverage across mid to high frequencies[3][5].
- Larger exciters do require more amplifier power and lower the system impedance. Careful impedance management is needed[2][5].
In summary, adjusting exciter size, either using a larger single exciter or multiple smaller ones, can potentially smooth the frequency response, increase power handling, and improve dispersion. But the tradeoffs of each approach need to be balanced for best results[1][4]. Proper pairing with the panel size is key.
Citations:
[1] https://www.diyaudio.com/community/threads/a-study-of-dmls-as-a-full-range-speaker.272576/page-38
[2] https://www.avsforum.com/threads/dml-build-w-exciters-doesnt-sound-good.3273889/
[3] https://youtube.com/watch?v=MHCpcbOnZZw&t=1
[4] https://techtalk.parts-express.com/forum/tech-talk-forum/64791-diy-flat-panel-speaker-love/page89
[5] https://www.daytonaudio.com/topic/excitersbuyerguide
[6] https://www.reddit.com/r/diyaudio/comments/q0zbj6/i_created_a_big_dml_system_and_learned_a_lot/