Thanks so much for all the great input so far. i need to clarify some of the suggestions though:
@loach71: Just to clarify I don't have a new sub here. I have 4-way speakers running in full-mode now (with jumpers installed on speakers input terminals) and each speaker is powered by a mono amp. Now I want to bi-amp them without external subs by isolating the LF drivers from the network. Thanks for the tip on starting out on low volume first.
@JuniorJBL:you said "You would not use the Ashly because the 250 XO is just split apart when you remove the jumpers" Good to know this and will try it this way first.
Does this also mean I need two Y-cables to split two outputs (L/R) of preamp to feed 1) Ashly and 2) HF amp (bypassing Ashly)? Currently using XLR cables btw preamp and mono amps.From loach71's reply, looks like I don't need Y-cables just connect L/R cables from preamp to Ashly then connect four outputs from Ashly to both HF and LF amps. Will this work?
@grumpy: I will check out and read the link provided so I understand what you meant to tell me. I am a bit slow on this sort of things.
Another question for clarity, if I want to use Ashly to driver the LF speaker (with jumpers removed), I will still need to remove the driver from existing network then run amp output directly to the driver, correct?
one of the reasons I bought external x-over so I can play with it and try to plot FR curves to educate myself - just another hobby I recently got myself hooked on).
Thanks to all for the help.