Pair of JBL 2440-16 compression drivers. The pro-version of the famous JBL 375. They are exactly the same drivers, but the 375 have black painting where the pro-series are all grey. 4" diaphragms and 2" exit. 500-12.000hz. Best paired with JBL 075 or 077 tweeters crossed over at 10.000hz. The...