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In the Forum: Audio Discussions
In the Thread: A listening room for a domesticated Cat?
Post Subject: There are plenty things to think about.Posted by Romy the Cat on: 9/25/2017

 martinshorn wrote:
The 75 cycle suckout likely resonates very long after, guess u can hear the tale after the impulse. I guess there must be an alisson effect around your seat of 3-4 feet (?) 

I was wondering about the 75Hz suckout, it should not be there but I would not worry about it. The K-horn is not mounted correctly in corner, we just throw it to the corner as is. The corner has baseboard that I did not remove and the K-horn has baseboard whole which is twice larger then my actual baseboard. If I keep the K-horn then I will change the back panel to assure a perfect corner fitting. Also. The K-horn has no top panel, so it is not really a finished experiment. I do not particularly feel comfortable about using impulse under 150-200Hz. To get there you need to use Fourier transform analysis to filter out room reflection and I always feel uncomfortable with interpreting it.  You can get very wide window, filter out the room and make the perfect timing but it will not always be the same as the max summing gain from 3 sources: 2 matching channels and the room. I personally prefer always include the room and I do not fill that FFT is practical at LF.

 martinshorn wrote:
I was wondering why u cross the K's so low. On the other hand maybe new driver and corner load optimization should be first in place, then I love the sound around the 200 cycle region from the K's more than any other in the world 
The K-horn runs with default woofer and if I want my Vitavox to be mount I need to pay for the K-horn and it requires to be made a custom backer that need to be glued in. The best upperbas that I heard in my life was from Vitavox corner horn, which is very much the same as the K-horn in bass section. So, I did not play too much with crossover, particularly as I have my uppoerbass horns that do just fine. The idea to cross it as low as I need was to minimize the frequencies that go time misaligned. But as I said, I need to experiment more with it.

 martinshorn wrote:
Edit: I see the suckout is gone when using the scanspeaks. Could be from the sealing maybe ?? In case u use large cylinder wave its gone. Stacking 2 Ks would do the same.

Well, the measurement with scanspeaks array is right channel, so it is less relevant.  I do not worry about the suckout too much and it is might be fixes later on. The bigger dilemma with K-horn is that it max unexpectedly low in that corner. If it was 70-80Hz or 25-30Hz then it would be workable but 40-50 is exactly where my room corner has large gain… Perhaps I need a smaller horn in that corner…

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