InDIYana build - SuperNova Minimus

[a4eaudio]

Yes, they did sound good and you had some pretty stiff competition in your group too. You got my wife's vote for the best in your group.

[Drjay]

I thought they sounded excellent and were especially impressive in the bass given the 1/2 CF cabinet.

[johnnyrichards]

These were very cool. I have always loved the look of the old school coffins.

[wogg]

Well, didn't get the votes but had a good time and really hung in there compared with the other entries. In my subjective opinion, these have ended up with a really detailed and clean mid and high end. Perhaps a little forward, with just slightly softer bass that would still benefit from being closer to a wall.

At this level of competition, really all the speakers sounded awesome. When everyone is targeting anechoic flat with good phase alignment, the differences become very subtle.

Here's the final system response, thrown through Blender to add the close mic woofer and port sum. The slightly soft bass is caused by the slow downward slope under 200Hz, ending at 50 where F3 landed. I'm also guessing the perception of detail is due to the 5k-20k range landing toward the top of the +-3dB window. In my subjective opinion, these would be excellent near field monitors for mixing as they really highlight the details very well.


And here's the final BOM and costs for the filter. I haven't done a simplified schematic yet, but the filter is textbook 2nd order on both with the padding resistor after the network to the tweeter.

[philthien]

The measurements look great.

Looking forward to your further report.

[4thtry]

Nice. I like how you mounted all parts to your removable baffle, making for a nice, neat package that can easily be removed for future repairs or modifications. Cool.

[wogg]

Before I go oiling them up I'm going to listen to them properly, with music and junk. You know, like speakers

[wogg]

Speakers complete! Now I just need to do some light sanding and apply some danish oil to freshen up the old walnut. Meanwhile... here's the results:

Right vs Left system gated comparison

The scale is zoomed in from default, overall within +-3dB with the narrow dip at 5.5k keeping it from being tighter than that. The biggest diference betwee L and R is in the tweeter range, where they deviate just under 2 dB from each other at 10k.

Impedance sweep L


Impedance sweep R


Both are easy 8 ohm loads.

[wogg]

We believe in Wogg! Sent from my Pixel 2 XL using Tapatalk

LOL!

I opted for split boards on the baffle.

[KEtheredge87]

We believe in Wogg! Sent from my Pixel 2 XL using Tapatalk

[wogg]

Replacement inductors in hand and tested. Looks good, the 4k lump is gone while holding the baffle step down. The key is to look at the 300Hz level, that should end up in the middle of the range for this system to end up flat as a whole.


Now I got to figure out where this lands in the cabinet and put together the peg board versions.

[KEtheredge87]

And- I can wind my own coils if I need to. That helps a lot!
Wolf

Without totally derailing Wogg's build log - I would love to learn more about your coil winding ability! I'll pick your brain at InDIYana on that if you don't have something handy to share here.

[Wolf]

And- I can wind my own coils if I need to. That helps a lot!
Wolf

[wogg]

Got the parts for the more baffle step version today and had 15 minutes to clip in place and measure. The baffle step change is right, but I got some underdamped chebyshev filter sloping going on that exacerbated the midrange peak at 4k.

I was trying to be cheap and make the same tweeter inductor work... bad idea. It has ended up measuring worse than the sim with the 4k peak staying put while everything else dropped 3dB.

Now I gotta buy more inductors. This is where I need access to Wolf's parts bin ;)

[wogg]

Not always. If you knew what I've been through in the last 2 months in terms of 'life', you might understand. FWIW, I knocked out the cabs in about 6 hours total. I've known the size and volumes and such for months, just have been unable to do the work. I only have to flush/round and cut holes in the baffles, as well as wire posts, and I'm ready for measurements. I have a large stockpile of parts, and drivers are on-hand. I likely won't have them finished for looks by then, but they will attend. If I hadn't done these, I would have nothing to bring, so I had to hurry... Later, Wolf

Didn't mean to poke at a bad couple months.... but looking forward to hearing what you're cooking, even if it's naked!