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In the Forum: Horn-Loaded Speakers
In the Thread: Should I low pass the midrange @10k?

Post Subject: To clarifyPosted by KS on: 8/7/2010

There might be 'rule of thumb' here, but let me explain a bit better with some specifics.

I'll have a Radian CD in a 425hz horn playing 800hz up to where it starts to roll off naturally at 6db at, say, 10K. And a similar Radian taking over from there in a smaller horn. (I've got a lot off leeway regarding XO points, and I'm not worried about where exactly they'll be at this stage)

But I read somewhere that high frequencies can in some way be 'problematic' when they become too high for the particular horn they are in. So I'm wondering if this is true, if there might be ever be any good sense in rolling off a mid freq horn BEFORE its natural roll off (lets pretend 7k). For example with full-range drivers, they might measure flat up to 15k on a smoothed graph but then listen you find you can hear cone breakup in the upper octaves, which you might not have guessed at before hand)

The simple thing would of course be to listen and see, but I'm in a fix wanting to run a 4-way system with a 3-way digital XO, so Im wondering before I buy the necessary amps etc, whether I could consolidate the uppper most two horn as one channel, i.e digital high-pass at 800hz then a passive XO on the tweeter.

So, if anyone here has ever found gains by cutting off the top end of their midrange before its natural roll, just say 'Yes' and I shall then investigate an active XO and buy an extra amp to allow for experimenting with this myself, with my particular drivers and horns.

Hope that makes sense, thanks anyone for input.

K.

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