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RE: YUP

Posted by Ed Schilling (M) on October 5, 2013 at 09:34:08

In Reply to: RE: YUP posted by Tre' on October 4, 2013 at 17:51:20:

Well, I say "not in the signal path" because the Coil and cap are across the voice coils as a "shunt" (I guess is a good word) and not "in line" with the voice coils as in a parallel network.

The VC's are in series. I've been messing with the Heils since the 70's and at one time was building magnet structures and buying diaphragms from ESS.

The first order series xover has a property no other type or slope has. I assume we all know what that is but just in case, here is a little primer.... http://sound.westhost.com/parallel-series.htm...... here is the gist.... assuming you have a suitable design and drivers and the xover point and slope are suitable.............. "The result is quite obvious - unlike a parallel crossover, the response remains flat regardless of a shift in the woofer (or tweeter) impedance. If both change in any direction, the same thing happens. In theory, this means that the series network is almost immune from impedance variations in the drivers."

If the series xover will work in your application this is a very good property for several reasons that should be obvious.

One caution....it seems the digital amps view the coil across the Heil as a short and respond by latching on the P/S. Maybe not all of them but for a fact some will and when they do they fry the bass driver. The good news is that the Heil is protected somewhat as the bass driver acts almost like a "fuse". Before we realized what was happening we fried 4 126's with absolutely no damage to the Heil. In the thread where it appears I was "getting into it" that was never the intent. Randy showed melted diaphragms.....I simply tried to explain why and how it often happens and that with the Horn/Heil/series xover that would be almost impossible to happen. The point was to rest any fears of the 50 or so folks who have bought them from me and to assure them that it would be almost impossible for that to happen.
Things went sideways from there.....it was assumed I was "preaching" and really I was just trying to give a little info. They should have thanked me for the info not attacked me for trying to hep my customers :)

In my room the Heils were "flat" from 2k out past 20K. my daughter could hear a 20K sine wave at 90db at the other end of the house.

In my opinion they are best when used with a very low mass, high efficiency, very wide bandwidth driver. Which is exactly why I did not bother to design a separate bass system and just used The Horns. It met all my goals.

It is my OPINION that with a series xover the actual type coil and cap is not very important since they are across the coils and not in line but I think the tolerance of the caps and coils ( between left and right channel components) is very important. I use 1% caps.

1973 Shovel, the series xover will work with your F1.
Ed

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