subjective commentary...Kappa Perfect 12VQ

[WmAx]

I'm crossing over to my bookshelves at 80 Hz using the receiver's crossover. I have a 20 Hz 2nd order subsonic filter from Harrison labs installed inline on my sub out jack. The sub is corner loaded. My room is a 2300 cubic foot rectangle with a door, no open spaces or vaulted ceilings.

This sub is obviously a completely different animal than the Velo I had. The Velo would sound at times like it was going to break on me when there was a lot of LFE in movies. With the kappa build, the bass is so effortless, nothing sounds constrained or on the fringes of damage, it hits hard but does so without feeling like its dying.

It's pretty much bass like I've never heard before.

Okay, I'm glad you are satisfied.

So, it sounds like it is performing as you expected based on the positive feedback on this site.

-Chris

 

[yettitheman]

I'll have to get around and build one of these sometime.

I could have bought an HSU VTF-2 a while back, but boy I kick myself for letting that thing slip through my fingers.

 

[WmAx]

I'll have to get around and build one of these sometime.

I could have bought an HSU VTF-2 a while back, but boy I kick myself for letting that thing slip through my fingers.

Why kick yourself over that? The Kappa Perfect project if built to spec will be far superior in every measurable aspect. You are better off now, if you put the saved cash from not buying the HSU into actually building the Kappa Perfect project. It may not cover the entire cost of the Perfect project, so just save a little more until you meet the budget goal.

-Chris

 

[Guiria]

NO EQ response curve

This is my in room response curve using TrueRTA. I never could get REW to work properly so I went another route.

I'm using an RS meter with a cal file loaded in TrueRTA. My test tones are done using the AVIA HT setup disc. I plan on a couple of EQ presets using the BFD, one as flat as I can get it, and the other using a house curve. I've got the house curve just about complete, needs a little more work on the low end Attached is the non-EQ'd curve. I could use another sub to flatten the response around that 55 Hz dip

As you can see the low end rolls off pretty steep below 20 Hz. I need to do this same test without the subsonic filter connected just to make sure it is doing the job.

 

[Guiria]

Couple o pics

Sub is obviously corner loaded. Having the amp on top keeps my kids from playing on it

You'll see around the driver and inside the port, I did a quick spray paint job when assembling. I should have done another coat but oh well, live and learn.

This sub is great, and I will never use a sub un-EQ'd again, the EQ makes such a difference in "real" bass. Now that it's all tuned in the subwoofer adds a level of realism to movies that I didn't have when I was hearing the boom from my other sub.

As crazy as it may sound my room at 2300 cubic feet could use another one to increase impact and smooth the response some.

Hopefully down the road I build something into my walls since the truss system is 24" on center. The simple midq build is just a smidge too large to fit. I may rebuild cabinets that would fit into the wall and at that point get another sub and ep2500.

Overall great project. Thanks to all on the forum for your fanaticism to audio

 

[Matt34]

Looks good! I need to do the same with my port and spray paint it. I also need to pick up some solder and tin my speaker wire to the back of the terminals.

 

[sawzalot]

Nice looking build ,sorry I missed this one,very nice indeed.I too would like to see more people add movies and or music to this thread.what have you guys watched and or listened to on the kappa build that just blows you away like no other.

 

[alexwakelin]

Nice looking build ,sorry I missed this one,very nice indeed.I too would like to see more people add movies and or music to this thread.what have you guys watched and or listened to on the kappa build that just blows you away like no other.

There are a ton of great bass movies out there, but the two that really blew me away were The Incredible Hulk (Ed Norton version), and Max Payne. Both of those movies have bass that is just off the charts. I've been renting stuff off of this list since I built my Kappa sub.

http://www.avsforum.com/avs-vb/showthread.php?t=755493

 

[Guiria]

I finally figured out what I was doing wrong with REW and now that I got it working it opens a whole new level of tinkering...

My graph is with some EQ but I plan on spending more time on it and smoothing it out as much as possible. I need to disconnect my mains and get the sub response smoothed down the sloping line. Looks like I need to turn the sub down a little as well ...nah

I'm just glad REW is working now.