I've had my micro-cube for about 3 months now and I would just like to relay my experience and get some feedback if anyone has any. It started out rough, but with some tweaking got much better.
My original build post is here: https://www.avsforum.com/forum/155-di...-15-build.html
(I'm not sure of the etiquette of starting a new post or using the old one, apologies if I'm doing it wrong).
When I first hooked them up I ran Audyssey on my Onkyo 805, I was a disappointed with how they sounded. They definitely had a ton of subsonic response, but not much else. Some material sounded like there wasn't even a subwoofer there, for example some music sounded very flat, not the boom I was expecting. But movies had a lot of very low frequencies. I could see a lot of movement, but not a lot of thump. I knew something was wrong when one of the subs bottomed out while playing War of the Worlds (About the 23 minute mark when the ground starts to shake). The volume wasn't even that loud. I think -17, iirc. (Coincidentally, search youtube for "sub bottoms out" and you'll find someone with the same problem at the exact same point. You can hear the cop say "Clear the intersection", then "pop").
I figured I needed a subsonic filter, since I bought the non-dsp version of the Behringer inuke3000 (impulse buy at a store in town and that's what they had in stock). I bought these (http://www.amazon.com/FMOD-Crossover.../dp/B0006N41BU
). They helped a bit, but not a huge improvement. I could play War of the Worlds a bit louder without bottoming out. Obviously the inuke dsp would have been much better.
I played around with different test tones and music trying to pinpoint what was wrong. I noticed that there were some odd sounds coming from the sub when there should have been just clean bass. Almost like a metallic chirping. I also noticed clicks when changing the volume on the receiver. When I disconnect the mains, I could very faintly hear the full range frequencies of whatever I was playing coming from the subs. Obviously, I never noticed this with my old sub because it had a low pass filter. I didn't think I would need one since the receiver should only be passing the correct frequencies. I remembered the inuke has some sort of crossover feature I thought I might use. Again, the inuke dsp version would have solved this. I discovered my inuke is slightly different than the manual available on Behringer's website. My crossover feature would put the high pass to Channel A and the low to Channel B. The online version is either a high-pass or low-pass for both channels. I figured I could still make due with the single channel by putting both subs in parallel to make a 2ohm load on channel B and nothing on channel A. This should effectively be the same power as the stereo 4ohm load. Once I hooked it up, huge improvement! Sounded a million times better. Obviously, this is not a recommended configuration. Does anyone know *how* bad this is for the amp?
One more final tweak I did, was to turn off Audyssey and EQ everything manually. I liked the way the mains sounded before so it was a matter of trying to duplicate that. Then I had access to the sub EQ. I currently have it set like this:
25Hz: -6bd (minimum)
63Hz: +6db (maximum)
(numbers from memory, may not be 100%)
This was the best improvement yet. This confirms, yet-again I should have bought the dsp version of the inuke. I watched Project X (not my favorite movie, but it's a 5 star (https://www.avsforum.com/forum/113-su...cy-charts.html
)) and it was ridiculous. The entire house shakes. Bassy music gives that tactile feeling I have been craving. I wonder if I would see much improvement if I upgrade to the dsp version?
All the above took place over the span of 3 months, with the last tweak happening last night. It's been quite a while, but I'm finally happy with my build. The main reason it took so long is that I can only really test things out while family is out of the house. The Wife isn't a bass fan like I am. Anyway, I now have two new problems:
While watching Blue Crush (again, 5 star bass from "Master List"), the inuke went into protection a couple of times. It's better than blown subs or fried amp, but I'm just wondering if this is normal. The amp didn't feel hot to the touch. It was barely even warm. With most everything else I'm not even hitting the limiter (the red light on the front). Mind you, it was pretty loud - volume at -5db. Could this have something to do with only using Channel B? Or is this just an exceptional movie for bass? Is this yet another reason to upgrade to the dsp inuke? Maybe even step up to the 6000 for the extra head room, I don't really need that much more power - or do I
Secondly, my projector vibrates a lot now. It almost added the the shaky camera effect in Project X, but was somewhat annoying in Blue Crush. It's very firmly mounted the the ceiling, but the ceiling is shaking that much. I can confirm this by standing in the kitchen, which is directly above, and feeling the vibration in the floor.
Is this just something I have to live with, or is there anything I can do? Edit: I see projector vibration is a common issue, I should have searched first
Thanks for reading. I would appreciate any feedback.
PS: honestly, they look even better in person, you don't see any of the imperfections