GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: Bye-Bye, Fane

Post Subject: AK47Posted by Jorge on: 4/11/2011

I wish I could stop the US government from selling AK47s in any corner shop in the US. If you give a monkey a gun, most probably he will shoot himself. If you give a monkey an AK47, well that is different. He will take anything he wants and few things will get on his way, Policemen; even un the US, dont carry assault rifles. You need the Army out on the streets, a different type of monkey!

I have a 120 hz horn, but with a 5 inch throat, designed specifically for this 10" driver, it has 102 db sensitivity and actual 110 db on the horn, no padding on my mid range compression drivers at all. it drops very agressively at about 1 khz, so just a 6 db high pass is needed. This 10" driver has the same magnet as their top of the line 18" driver, paper cone stiff suspension.

I guess it would be simple enough to add a couple of inches in order to bring the throat down to 4" in order to try the Studio 8M. I have already reduced it temporarily to 3" in order to try the JBL 2490h compression driver. I made an interesting test: I put the JBL 2490 on one side and the cone driver on the other side and unhooked the rest of the channels, I switched form one side to the other trying to see what differnces I could find between them, in the begining the differences were very big, I started adjusting the back chamber volume milimetrically untill I got 90% of what the 2490 was doing so wonderfully, there are still big diferences but they balance out, the 2490 is more detailed, transparent and dinamic, while the cone driver goes lower, keeping most of the attributes of the compression driver. This little bit lower, maybe down to 110-100 hz allows better integration with the channel under it, without this extension, there was a hole in there and this frecuency is so important, the lower register of even female voices was cut off and done by a woofer with terrible results. Now if I could get another horn to take it from there....

About the GOTO SG146Ld, well, it was a hipotetical question, I still cannot afford them and of course would not give them away ;-) but beyond that the next step I guess would be to get the horn going maybe even with a 12" or 15" driver making the provision to be able to attach an extension for the 4" GOTO while staying "reasonably" time aligned.

The interesting question here would be: where is the bordeline between an Arquitectural horn and a Furniture horn. This 120 hz horn can barely fit through a big doorway, it has a diameter of 92 cm and more than one meter long; Still maybe a longer squared horn with maybe one 90 degree bend or less, just a curve of say 20 or 30 degrees, some sort of J horn could work down to 60-50 hz making it around 2 meters long going from say the cieling to the floor could work, making the mouth to discharge against the floor in order to give the wave some time to mature...

Or just be a man tear the roof down!

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