Wolfson's Q4 forecast is $40 million to $50 million whereas it had generally been expected to be $58 million.
Q3 sales were $44million. Last year Q3 sales were $53 million.
The shares fell to below 150p. They have fallen by a quarter this year.
Blackberry's Q3 saw sales down 45% on last year with a loss of nearly $1 billion on $1.6 billion of revenue.