I'm continuing with the op amp rolling, many of the ones I want to try are only available as SMD's so I bought some SOIC8 to Dip8 adaptor PCB's, warmed up the Iron and grabbed a magnifying glass to aid my getting on for 60 year old eyesight. The op amps here are AD8066 which are supposed to have better deep bass than the OPA2134 being used at the moment, they are supposed to be good for the top end as well so two per channel required. They will be mated with LM4562 which are good for mids (band pass) and the input buffers so six of those needed. I have them running in at the moment, folks on various forums say run them in for a couple of days, which I can confirm seems to be about right for these devices to settle in.