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In Reply to: RE: Compare and Contrast upgrade issues on .7 vs older? posted by Green Lantern on July 17, 2021 at 06:13:15
As best I can discern, there is no difference in the crossovers of the non-i models v. the i models. Beyond modifying the crossover, the usual Maggie tweaks (wood frames, losing the jumpers and fuse, etc) would be the same and there would not be a reason to post.
I did contemplate doing surgery on the 3.7i but decided against for two reasons: 1) The 3.7i (and 3.7) has a pile of caps and replacing with "higher grade" would cost a fortune and the expected improvement would be small and 2) conversion to a parallel crossover topology with the goal of going to biamping was more difficult than I anticipated. This would have been relatively cheap as I already owned two identical amplifiers and an active crossover (XM-44). While in theory any series XO can be converted to a parallel XO in actuality this was not the case. The reason being that a series XO always results in a flat output but my attempts at an equivalent parallel configuration resulted in a "bump" at the XO frequency. I did work out a parallel XO for the 1.7(i) but, since I didn't own a pair, it was just an exercise of the mind.P.S. For Davey: The failure to get a flat output curve with the 3.7, I believe, was due to the mid-driver being 8 ohm while the woofer and tweeter were 4 ohm. When I made the impedance of all 3 drivers the same the curve flattened out.
I married the perfect woman - the downside is that everything that goes wrong is my fault.
Edits: 07/17/21Follow Ups:
Are you sure the 3.7 has an 8 ohm midrange driver??
Dave.
Yes, I measured it myself and also discussed it with Wendall who confirmed my measurements.
I married the perfect woman - the downside is that everything that goes wrong is my fault.
Neo - check out Joe Schmo's post a couple rows below.
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