Have 2 Jbl compression drivers from the signature series. 1 is marked (model 175 ) and is rated at 16 ohms. The other (model LE 175) and is rated 8-16 ohms. The 175 is an older series than the LE 175. Did JBL just stamp the LE infront of the 175???? What are the technical differences between these two drivers besides the finish on them. I found lots of data on the LE 175. But nada on the 175???????