Aerius acoustic backing

[sleepysurf]

Happened to be surfing the Acoustic Sciences website, and noticed they have some leftover acoustic "back boxes" for the Aerius' on clearance. I read positive comments about these years ago, and was contemplating buying a pair when I owned the Aerius i's. They supposedly improve imaging, particularly when you're forced to have your Aerius' closer to the front wall than optimal. $325/pr is a pretty good price, but I bet they'd sell 'em for even less!

For anybody interested, here's the link (scroll down to middle of page)...
http://www.acousticsciences.com/clearance/clearance.htm

 

[Kruppy]

There was a discussion about these on this site a couple of years ago, I haven't found the thread yet.....

 

[JonFo]

Alan, good find. Those should be of interest to any Aerius owner, as they allow different placements than the traditional.

As you saw a week ago, I have a pair of foam wedges (Auralex corner traps, simple cut foam) sitting on the rear deck of my Monoliths.

While measuring the Triac effects, I decided to also measure the effect of the foam.
So I placed the mic 10cm from the panel, at mid point of the foam block behind.

The I took measurements without (blue line) and with (red line).

As you can see in this impulse response graph, the foam has some impact at 1 ms, and a significant impact at 6ms. The 6ms spike that’s gone is the wall bounce from behind the speaker. Since the foam absorbs the bounced energy, it’s much smother.

 

[JonFo]

In this frequency response view of the same measurement, you can see the slightly smoother mid-bass with the foam. The mid and treble is also slightly smoother due to the absence of interference from the wall bounce.

In practice, this is all barely audible, but I know I’ve preferred to have them there. So it’s good to see there actually is something measurable.

 

[JonFo]

Kruppy, I’m sure you are right, as I also recall a conversation about this many moons ago.


The Aerius back box should totally limit the rear wave cancellation effect of the dipole radiation, so it should have much improved mid-bass.
Likewise, the highs should be cleaner, as the rear wave wall bounce will be mitigated.

Now, the question is: does the total enclosure of the rear wave mass-load the panel in some funky way that might secondary effects on frequency response?

I would assume they left some room for a pseudo-reflex port in the rear bottom.

 

[Kruppy]

Found one thread, it's a couple of posts down, I believe there's another older one yet to be found.

http://www.martinloganowners.com/~tdacquis/forum/showthread.php?t=1942&highlight=aerius+acoustic+box

 

[Kruppy]

It goes back a bit......

Found it in the old forum section:

http://www.martinloganowners.com/~tdacquis/forum/messages/8722.html

Sorry to dredge up some old trash, I just realized the infamous banned kevin was involved with this one.