Posted by Wayne Parham [ 64.216.179.54 ] on December 23, 2004 at 16:25:47:
In Reply to: Re: horn types? posted by scp53 on December 23, 2004 at 12:06:59:
You could certainly pair an APT tweeter with an Alpha 8 or 10 speaker, and I'd expect good results. You'll need to pad the tweeter down to match, and you'll want a crossover slope that blends well. Very do-able.
I've used a handful of successful arrangements for speakers like these. The eight π loudspeaker uses an Alpha 10 on a midhorn and reflex-tuned rear chamber for the bass. I use a PSD2002 with 1.6kHz crossover. The one π, two π and two π tower speakers use a smaller tweeter crossed over higher. For many years, I used the KSN1038 piezo tweeter and I could count on very good performance from that part. But it looks like I'll be switching to the Vifa DX25 soon because the KSN1038 has been discontinued.
The KSN1038 is a compression horn driven by a small cone diaphragm. Performance is good particularly for the money. But supplies are nearly exhausted, and I'm not sure if and when CTS will find a buyer for the tooling. So I've redesigned to use a Vifa DX25 dome tweeter, which is silky and smooth. They're more expnsive, but they do sound nice.
I considered using the APT tweeters when making the change, but I decided on the Vifa DX25 instead. I used a first-order filter on the Vifa, and I suppose that might work on the APT too. But unless a person is very careful with input power, I'm not a fan of first-order crossovers on compression drivers. It's too easy to over-drive them and send the diaphragm into the phase plug.
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