Quote Originally Posted by edgewound View Post
You can use a 175, which this system did, as long as it's not an early narrow gap model. 2410/2421/2460/2470 will work as well with a new diaphragm. I didn't do anything to this pair of 175s in order to preserve the wax seals per the customer and they swept great. The LE85/2420/2421 is a stronger motor which will yield increased upper end reach.

Here's the basic circuit. I ended up tuning it by ear by adding an additional 10uf cap in series with C2 which yields 8uf...and added a mechanical 50 watt L-Pad. Seems it brought the hi pass up to ~1800 or so. I can't really explain what happened electrically in detail, it just sounded right.
Thank you!
Not following what you're telling about the caps in series netting you 8uF though?
In series means subtractive, correct?
If 8uF was what you settled on and liked, could I just use an 8uF to start with?
I like your approach, less is more!
Thank you for taking the time to put this up