05-04-2011, 11:16 AM
I have a pair of Optimus LX5's as well as Pro 77's. The LX5's use the dipole Linaeum tweeter and the Pro 77 have a monopole.
Does anyone have a schematic for a crossover on these models and instructions on how to wire them in? And is there an advantage for using dipole instead of monopole or vice versa?
05-04-2011, 05:29 PM
I'm not sure about a crossover upgrade, but I put some duct seal in the front face and speaker basket, stuffed it with a pile of poly, and man does it sound better! The low mid hump has cleared up considerably.
I'm interested in a crossover mod if there are any good ones.
05-04-2011, 07:39 PM
You may have already seen that Dennis Murphy reworked the crossover (http://murphyblaster.com/content.php?f=rslx.html) for the LX550 iteration of this dipole tweeter two-way.
Murphy's proposed upgrades, with or without tweeking perhaps, may work for the LX5. They address issues of woofer breakup overlapping the tweeter, similar to that reported by Stereophile (http://www.stereophile.com/budgetcomponents/695ratshack/) in their review of the LX5.
05-04-2011, 11:30 PM
The thing is, the LX550 uses a different woofer than the Pro 77's and the LX5 used about three different woofers during it's run. I have a pair of Pro X88AV's (ported and shielded version of the Pro-77) and I'm going to convert the crossover to a second order LP/HP with a Zobel on the woofer.
I really, really don't like the enclosures of the LX5's and I'll be parting out the tweeters on the ones I have rather than trying to fix the enclosures. Because the models with the mono-pole Linaeum tweeters are much more placement friendly, I prefer them.