Not a problem. I know someone who can advise on this. However, if you could advise on frequency level of how low I should go, before eliminating signal to the BMR midrange, that would be great. I am guessing wiping everything below 200 or 300 hz would be about right, but IDK.
You should only use the EcoCore that Meniscus Mark sent you. You can scavenge enough from the big sheets to fill the midrange chamber fully. I'm not a believer in cap upgrades except for the tweeter, and that's only because the values are low and you can upgrade fairly inexpensively. It won't make any difference, of course, but you won't lose sleep wondering what might have been.
The Purifi engineers have contacted me to see if there's any way to make the Purifi work in the BMR cabinet. Currently, it tunes too low with the passive radiators, and I couldn't find a port configuration that was practical. It may be that the best use for the Purifi would be as a dedicated sealed midrange in, say, one of Jim Salk's large towers, which run the mid from about 400 Hz to 1900 Hz. That way you could take advantage of the driver's super low HD and IM distortion in the midrange without having to find a workable PR or ported configuration.
Release plans or a kit maybe so poorer folks could give it a try?
I don't think I ever saw this post. I couldn't find a practical port configuration that had sufficiently low chuffing at high volume. And the factory passive radiators tuned the box too low even with no added mass. Since then, I've worked with a mini[-tower cabinet with a long port designed by Jim Salk, and that works great, but it uses two Purfifi's in an MMT configuration. Expensive, but a very clean, high output machine.
Have anybody done this, and if so, how's the result? I'm concerned that the driver arrangement of the horizontal BMR is asymmetric (i.e. compare to MTM). The tweeter and woofer are at different side, and even the mid-range driver is not centered horizontally as far as I can tell. Wouldn't that affect the center imaging from this speaker?
The pads aren't meant to be used with the 64-10 tweeter. They're designed for the 70-10, which has a native response that starts taking off in the highs and is maybe 10 - 12 dB hot at 20 kHz. Although the pads do improve vertical dispersion slightly, their main purpose is to act as a passive tone control to flatten out the highs when spaced far apart, and to tilt down the highs from flat when placed close together. In any position on the 64-10, the highs will be tilted down. There's also the issue of whether you want greater vertical dispersion. That's very controversial.
