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In Reply to: RE: Compare and Contrast upgrade issues on .7 vs older? posted by bruce.warren on July 16, 2021 at 07:38:27
you could replace the stock caps with something more energetic but those types of things are always an adventure..When I replaced the caps on my 1.6's it was based on different folks who posted various brands of capacitors.When the foil series came along I've seen very little post involving surgery on any of the 'i' series so it's pretty much an open frontier.
Edits: 07/17/21 07/17/21 07/17/21Follow Ups:
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: 07/17/21
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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