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Old 4th November 2005, 07:51 AM   #11
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Hmm, not bad. I'd be cautious though as it stands -there's a massive peak at cut-off according to your sim (what did you use BTW?), which will make for a boomy sound, especially as it's right in the zone that many recording engineers tickle up to add some extra weight. I know a small peak of 1 - 2 db isn't usually noticeable, but this as it stands breaks the limits by some margin. That impedance curve is pretty vicious too -only PP valve amps that can swing some current or one of Nelson's trans-conductance power amps need apply methinks, unless you've got a high power SS amp with a big resistor in series with the driver.

On the up side, above cut-off, it looks great -slightly decreasing response as frequency increases, which will make for a subjectively warm sort of presentation that'll be very easy to listen to over the long term, and very little ripple indeed. If you can just get rid of that large peak, I think you'd be really on to something there. Worth pursuing IMO.

Cheers
Scott
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Old 4th November 2005, 11:28 AM   #12
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HI Scott


I've build a simular projekt with the Vifa 10BGS (you can find it here: http://www.hornlautsprecher.de/vifahorn.htm )

As you can see at the second sim we also have had a peek at the end. After we have build this horn and measured the frequenz he couldn't find/hear this peek. That is in most cases the difference between the simulation an a real projekt.

I haven't build this horn so I can't tell if it realy works. But as I know from my past projekts it could and I have a good feeling.

The impedance is like a BR.
I am using a single ended MOSfett with 15W/channel/8Ohm. Its pretty simular to the nelson pass ALEPH 0 and a NAD216. All my horns have these kind of imp. and I have never had a problem.


Maybe someone has the time and the wood to build a testbox to see if the horn worx. I haven't got a Fe108ES so I can't try it.


Till
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