A few ideas that have worked with my students:
-Say "haup" when you take a breath and blow with warm air
-Blow the sax with the same feeling in your throat and tongue as when singing Ah on the lowest note you can sing.
-Make sure the head is level and the mouthpiece is going straight into the mouth
-Blow your airstream as if your are blowing toward your thumb on the octave key
-Have your embouchure set so that an Ab Concert is produced when you play the neck and mouthpiece alone
If you practice doing all of the above and a high A still comes out when you play a D, check to see if the neck octave key is opening slightly (it should only open on high A and above). Good luck. Hope some of this helps.
John
-Say "haup" when you take a breath and blow with warm air
-Blow the sax with the same feeling in your throat and tongue as when singing Ah on the lowest note you can sing.
-Make sure the head is level and the mouthpiece is going straight into the mouth
-Blow your airstream as if your are blowing toward your thumb on the octave key
-Have your embouchure set so that an Ab Concert is produced when you play the neck and mouthpiece alone
If you practice doing all of the above and a high A still comes out when you play a D, check to see if the neck octave key is opening slightly (it should only open on high A and above). Good luck. Hope some of this helps.
John