I was just wondering if anyone knows the difference in midbass design from the signature series and the true HD line of midbass drivers they produce now.

I have a set of the signature line midbass drivers and just ordered the "transient optimized" crossovers and a set of the 1" silk tweeters.

They have the same logo and same red basket, even looks like the same magnet so I'm hoping they haven't really changed anything when they went to the HD line.

I got these around 1999 or 2000 and just pulled them out of a box recently so any thoughts would be great.