- What size ( dimensions please ) will fit comfortably into your listening space?
- Don't you already have a pair of M19(s) ?
- If so, what is it about them that you want to improve upon ?
- I've looked around and can't find any existing cabinets ( or plans ) that really fit the bill . JBLs' model 4508 cabinet comes to mind, but it's a mite small for 2, 416s .
- I suspect that you will stuck doing a custom design/build that may or may not meet your LF expectations ( whatever those actually are ) .
- One idea here, contact some local sound companies ( within a 150 mile radius to you ) and ask if they have surplus bass bins for sale ( single or dual 15 ). SR companies this time of year are discovering their surplus needs . Find out the sizes that are available and take it from there .
>< cheers