Well, it takes even more time when you're working a lot, and also when the development effort takes some unexpected twists and turns.
Two weeks ago a second test box was finished, using an old Woodstyle W123 standard enclosure- not very heavily braced, compared with the M8 (see earlier post).
After business travel and various activities with my daughter last weekend, I finally got back to the project this weekend, and tested the new crossovers with the text box, revised and tweaked them, about four cycles through on evaluating measurements and listening, before "freezing" the design for now. Then, since the first M8 enclosures were finished over a month ago, I loaded one with a set of crossover and zobel boards and drivers (MB MBTTR1 tweeter, Focal 8V4412 woofer.)
I've been listening and cleaning up the disaster area a little- so far, I'm quite pleased on a variety of material. I haven't finished "final" measurments because I don't have the diffraction control materials in place, and I haven't set them up for room measurements- sill, out in the center of the room, they're behaving as well as I would expect.
The crossover is the biggest hoodoo-voodoo here- besides the heavily braced and dampened enclosure. It accomplishes some of the same things that Joseph Audio does in their RMsi series speakers, but in a very different way. Net result is ability to run a relatively low crossover frequency (1.5 kHz), having more uniform than average frequency response even 30 degrees and 45 degrees off axis, and having a wider vertical window for good power response than you'd expect. What's weird about these is how good they sound even 70-80 degrees off axis. Or in the next room. That requires strong correlation between on axis reponse and total room power response.
They "blow away" the ScanSpeak based two ways I built in the mid nineties on Sarah MacLachlan, one of the artists I really liked on those older speakers.
Sax and female voice seem to be particularly soulful on these. I've been listening to "Yellowjackts", and now the SACD of Grover Washington Jr. "Prime Cuts" is on, with "Strawberry Moon" spinning right now, and bringing a big grin to me, even in glorious living "mono". I can't wait to here what a pair of these sound like; the way the midrange and sound field works from just one, [/understatement on] I think they're going to image reasonably well [/understatement off].
Regards,
Jon
Earth First!
_______________________________
We'll screw up the other planets later....
Two weeks ago a second test box was finished, using an old Woodstyle W123 standard enclosure- not very heavily braced, compared with the M8 (see earlier post).
After business travel and various activities with my daughter last weekend, I finally got back to the project this weekend, and tested the new crossovers with the text box, revised and tweaked them, about four cycles through on evaluating measurements and listening, before "freezing" the design for now. Then, since the first M8 enclosures were finished over a month ago, I loaded one with a set of crossover and zobel boards and drivers (MB MBTTR1 tweeter, Focal 8V4412 woofer.)
I've been listening and cleaning up the disaster area a little- so far, I'm quite pleased on a variety of material. I haven't finished "final" measurments because I don't have the diffraction control materials in place, and I haven't set them up for room measurements- sill, out in the center of the room, they're behaving as well as I would expect.
The crossover is the biggest hoodoo-voodoo here- besides the heavily braced and dampened enclosure. It accomplishes some of the same things that Joseph Audio does in their RMsi series speakers, but in a very different way. Net result is ability to run a relatively low crossover frequency (1.5 kHz), having more uniform than average frequency response even 30 degrees and 45 degrees off axis, and having a wider vertical window for good power response than you'd expect. What's weird about these is how good they sound even 70-80 degrees off axis. Or in the next room. That requires strong correlation between on axis reponse and total room power response.
They "blow away" the ScanSpeak based two ways I built in the mid nineties on Sarah MacLachlan, one of the artists I really liked on those older speakers.
Sax and female voice seem to be particularly soulful on these. I've been listening to "Yellowjackts", and now the SACD of Grover Washington Jr. "Prime Cuts" is on, with "Strawberry Moon" spinning right now, and bringing a big grin to me, even in glorious living "mono". I can't wait to here what a pair of these sound like; the way the midrange and sound field works from just one, [/understatement on] I think they're going to image reasonably well [/understatement off].
Regards,
Jon
Earth First!
_______________________________
We'll screw up the other planets later....
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