add notes from testing the speaker with an espotek labrador

1 files changed, 10 insertions, 0 deletions

diff --git a/notes.md b/notes.md
index 22b49ea..29ef053 100644
--- a/notes.md
+++ b/notes.md
@@ -21,3 +21,13 @@
 
 ## 2024-03-28
 ![](2024-03-28_notes.jpg)
+
+## 2024-03-30
+- the speaker was tested with a function generator (from the
+  EspoTek Labrador) outputting a square wave of varying frequency
+- it is painful above a frequency of 12 kHz and just creates clicks
+  below 30 Hz
+- it is louder at certain frequencies and quieter at others, and this
+  is not a linear relationship
+ - the speaker's datasheet has a graph of this which can be used to
+   adjust the speaker's volume at the problematic frequencies