GoodSoundClub - Romy the Cat's Audio Site

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

Post Subject: Driver in a hornPosted by Jorge on: 4/11/2011

I have seen Beyma rewrite their specs when they redo a driver and even add a letter to the driver for that change, even if it is the same driver.
Now I have seen variable FS responses form different drivers of the same model also.

I was joking with a close friend the other day, he had just sold a very expensive piece of gear so we all chipped in to help him decide what he could spend all this money on, Of course I insisted on a pair of GOTO SG146 Ld, this is a compression driver that is supposed to go down to 30 hz with a price tag of around 25k a pair. Now imagine I just give them to you, free of charge, you bring them home and put them on the shelve. Now start thinking about what horn you will make for them: for 30 hz we have a wavelenght of around 10 meters, a quarter of this s 2.5 meters long, at this lenght the size of the mouth becomes not so important, now time align this horn with the rest of your horns. The best we could come up with for his house was tearing down the roof and building a new one with horns.

I have now a full working, nice 120 hz horn with a 10" driver, I have made 3 or 4 pairs of horns to arrive to what I have today, I started with a pair 180 hz horns with lowther DX3 drivers, all the ferocity that lowthers are known for, inside a horn they become a pussy cat, very soft sounding. I made the horns with an 8" throat and no compresion. in my system they would go down nicely to about 400-300 hz and poop out with just noise under that. I tried fostex 206 and other drivers, I finally changed the horn to a bigger 140hz with a 4" throat, better compression better sound still too much in the midrange for my taste, I have tried the same horns 180, 140 120 hz with a bunch of different dirvers with different back chamber volumes etc. Making work a cone driver inside a horn is a several month job, as the moron I am, I never expected to spend so much time on this.

IMHO the upperbass horn is the most important channel in my playback, and getting it right is a priority. Unluckily I have spent even more time trying to get the frecuencies under it to sound right...

The idea of buying a new pair of drivers for my upperbass horn implies making a new pair of horns for them, testing them , adjusting and readjusting back chamber and then re mixing it with my other channels, easily a few months work. If I get the Studio 8M drivers they will most probaly go in my unused drivers closet, trust me I will have a hard time finding room in it for them. Maybe right next to my pair of GOTO SG146LG! jijijijii

I was just curious to see if they already have the specs for the new run.

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