Is my amp the problem?

The XO is a Pioneer SF 700. I will use it only as a low pass at approx 200hz. This is to compare with the mindsp re input impedance and output voltage. I am using a cap on the input of the Modwright as a hi pass.

Just as an experiment, what happens if you bypass the crossover and drive the preamp straight into the power amp driving the subs? The question is, how is the bass then?

Ill check that later today. I am getting improvement in the system as I work on it. However I would say the bass is not there yet. Ill drive the crown directly from the pre. I would think there would be a sonic difference and will report back. Thanks.

almarg, Dan agreed with you. he said 20K is good input impedance 30K is ideal. He is very helpful, one of the nicest guys to deal with. Love his product and his attitude, good karma for sure. I purchased (on his suggestion) 2 output coupling caps to help solve the problem. Your suggestions and help are greatly appreciated. Thanks all was I work through this. I am confident it will be solved in time and with money Lol

I bypassed the mindsp and went straight to the crown on the woofer and KWA100SE on the mid/twt. It did sound better. Not wonderful, but better. Next is to try the active XO with a higher input impedance (once I can get it). New amp should be here Thursday.  

Thanks for the update. Although the input impedance of the Crown XLS 1002 is not specified (as Auxinput had indicated earlier), its similarly rated predecessor model, the XLS 1000, was specified as having input impedances of 10K single-ended and 20K balanced. Given also that pro-oriented equipment very often seems to have relatively low input impedances I would think it to be a good bet that the input impedance of the XLS 1002 is the same or similar. 10K happens to be the same, of course, as the specified input impedance of the miniDSP 2x4 HD.

Also, the 20K balanced input impedance probably means 10K per leg (i.e., a 10K load being applied to each of the two signals in the balanced signal pair). And the output stage of the LS100 will see that 10K load in parallel with the 15K to 23K input impedance (at various frequencies) of the KWA 100SE regardless of whether the connection to either amp is via XLR or RCA, since as I indicated earlier the LS100’s XLR output is driven with a single-ended signal.

15K in parallel with 10K is 6K. 23K in parallel with 10K is 6.97K. Both values are of course far below what Dan recommends.

The input impedance of the Pioneer SF-700 Electronic Crossover is spec’d at 100K. Much better! Although it appears that the SF-700 dates back to the early 1970s, so the possibility that it may be in less than top condition is something to keep in mind.

Good luck. Regards,
-- Al