Welcome! Need support, you got it. Or share your ideas and experiences.
In Reply to: RE: RD75 baffles posted by SteveJewels on February 17, 2021 at 04:39:27
Part of it is to average out the effects of edge diffraction (by varing the distance from the center of the driver to the baffle edge and vary the total width of the baffle) over the height of the baffle, but it appears to have redistributed it from top to bottom.
FWIW, you can attach the ribbons to the sides of your existing baffle until you get new baffles. Magnepan did this for their 30.7 for condos demos, but it also appears they trimmed off one side of the metal cage which would not be necessary for a interim configuration.
Thank you @emailtim!
Can you suggest a good crossover freq and slope from the RD75 to the tweeter?
I'm using 2500 Hz with my Neo 8's, if only because that's what the original crossover does. :-) But I think it's safe to say that that's safe, given that Magnepan chose it. 18 dB/octave would be safe, seeing as you can't make a compound curve with the midrange since the RD75's play so low. (An LR4 might be even better, but it could make the transition between the RD's and the Neos more obvious.)
In general, the higher the crossover point, the louder you'll be able to play without the ribbons starting to sound hard, but as you raise it, you get more crossover lobing and head position becomes more critical as a result. Satie is the expert here, since he's experimented with various crossover points.
I just did a comparison, Neo 8 array in one speaker and Neo 8 + ribbon in the other, and the ribbon won. It's just a better tweeter, one of the best ever made -- more transparent, extended, detailed, and incisive (transient response -- pianos are more realistic, etc.). Not that the Neos weren't credible on their own, and there are definite advantages to running a single driver full range.
Sorry, have nothing to offer other than to keep the XO's out of the most sensitive hearing range [2kHz-5kHz]. Higher XO points conflicts with the optimal physical proximity limitations. Ideally, you want the mids and tweeters physically located as close as possible which in turn causes line array structural hurdlers.
I experimented a little with trying to integrate the ribbons, but ended up running my NEO8's full range on the top end without the ribbons.
I took off the tweeter side wood styles and attached a narrow baffles containing the NEO8's in place of the wood styles to get them as close to the ribbons as possible without cutting the original Maggie frames.
I then put the NEO8's in their own separate baffles and are running them that way. I may try pulling the ribbons and attaching them to the sides of the NEO8 baffle like what Magnepan has done but am not at that stage yet.
FWIW, Josh and I are using software XO's for experimentation which allows you to try virtually any point/slope combinations. Josh and Satie can probably give you a better idea because they are already running the ribbons with the NEO8s.
Post a Message!
This post is made possible by the generous support of people like you and our sponsors: