Update README.md

README.md

@@ -119,11 +119,11 @@ After brainstorming for the first design iteration, we decided on using magnet a
 <img src= "img/wireplotting11.0.jpg" height=400px>
 
 <!--need to verify if it is 1/8" magnet and wood... was it plywood?-->
-We then lasercutted the outer frame from 1/8" wood to clamp the coil membrane. 
+We then lasercut the outer frame from 1/8" wood to clamp the coil membrane. 
 
 <img src= "img/wireplotting11.jpg" height=400px>
 
-We then lasercutted the magnet grid plate from the same kind of wood.
+We then lasercut the magnet grid plate from the same kind of wood.
 
 <img src= "img/wireplotting12.jpg" height=400px>
 
@@ -164,7 +164,7 @@ We tested the cutting settings and found that the best values were: 3% speed, 80
 
 <img src= "img/wireplotting24.jpg" height=400px>
 
-Here are some five shim/spacers we lasercutted from this thin plastic sheet.
+Here are some five shim/spacers we lasercut from this thin plastic sheet.
 
 <img src= "img/wireplotting25.jpg" height=400px>
 
@@ -231,6 +231,8 @@ Test of the stereo speaker with coil membrane pasted on the plastic.
 
 If you compare this video with the two spacers one, you will notice that it seems to have better sound with a stiffer coil membrane.
 
+The speaker on the right has some holes that were countersinked so we could nest the bolts deeper into the top frame and hid the holes with a plastic film.
+
 ## Links:
 
 - [Planar magnetic headphones](https://www.innerfidelity.com/content/how-planar-magnetic-headphones-work)