GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s Midbass Project – the grown up time.

Post Subject: Eventually!!!Posted by Romy the Cat on: 8/30/2010

I spent some time with my back chamber, trying to drive the driver resonance heighted. I built a sealed sarcophagus as a back chamber (if somebody are interested I can post a picture) approximately 1.5 gallons but it moved Fs for 700Hz. Then I began to fill it with all imaginary shit and I got another 2.5Hz. Not enough! So, I concluded that the size of back chamber shall be infinitely small, perhaps even smaller then the size of the driver basket. Then I got a strong electric tape and tape out the driver basket windows. It was sealed but the tape, even in 3 layers, still have some elasticity.

The resonance went up to 49Hz. That is already something I figured and begun to punch needle hole in the tape. After the 5 holes the resonance was set at exactly 42Hz. I took away my 100R resistor (I measure voltage not current) and play some music for test. I can’t describe with other words that amassing. It was in fact so good that I felt crying. It was absolutely different bass then what I had from this horn before. It was much deeper, with much more textured bass. It was huge in size as before but this time it was stunningly soft. The softness and kindness of the horn made me flabbergasted. I play at much moderated volume but horn was screaming like thunder. Making it painfully loud made me to fell… not painful, in fact I played it so loud that I thought my basement windows will be blown away. Still, at this barbaric level I felt no chest pressure and no body discomfort. The volume of tone was rising faster than the volume of pressure –and this is not just a big deal but this is a huge! The softness of the horn sound is from out there. The horn is rolling to it’s pitch very genital, like a young mother laying a bad a sleeping infant. Still it doe it very confident with an amazing sense of anti-compression.

Hey, I figured out that I got this midbass driving my horn from table radio, with unfinished horn (5 and 7 section are not glued), not loaded the horn with sand, using chicken wire as back chamber and sitting in my shitty basement. If so then I think I will be VERY happy when I bring my horn upstairs.
Now about what I am concern. It will be VERY important to set the low pass for this horn properly. The upper frequency of this horn is horrible, absolutely horrible. I think it will be needed a more or less sharper filter and I know at this point that that it will need to be set VERY smartly and very prissily. Surrey it all will be after the horns are intaled but so far the result I get makes me very happy and very enthusiastic.

Rgs, Romy the Cat

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