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Old 8th April 2007, 10:58 PM   #11
v-bro is offline v-bro  Netherlands
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This is how it looks (still a prototype, I've found much smaller components by now...) :
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Old 25th April 2007, 11:26 PM   #12
v-bro is offline v-bro  Netherlands
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Did some measurements on the filter and the combination with Monacor SPH-30X...

I immediately changed some components to raise the frequency on which it filters (the dip is now @ 2.2Khz, still quite wide range...)
Here's what I had initially created, and sounds quite nice...
It was measured with the potmeter in max. filter setting...
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Old 25th April 2007, 11:30 PM   #13
v-bro is offline v-bro  Netherlands
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Here's with minimal filter setting:
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Old 25th April 2007, 11:34 PM   #14
v-bro is offline v-bro  Netherlands
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Here's the result through the monacors with the old filter in 'medium' setting:
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Old 25th April 2007, 11:37 PM   #15
v-bro is offline v-bro  Netherlands
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Still busy with tweaking, right now I get the best results with a 145nF cap, more measurements will follow...

Here's how they measure without filter:
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Old 26th April 2007, 03:30 PM   #16
Geoff H is offline Geoff H  Australia
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Hi v-bro. That is a nasty peak at 9.3K. Could be too sharp for a twin t filter, but I'll give it a go.
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Old 26th April 2007, 11:14 PM   #17
v-bro is offline v-bro  Netherlands
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In real life it's a big plus IMO. The highs don't sound harsh at all, rather delicate and detailed. Note the measurements were done pretty close-up, from larger (listening) distance the higher frequencies normally stay more behind. At least it gives a tonal balance that makes you suspect a tweeter is used.

The system I use it for was never intended to become hifi, otherwise I would have used a wooden cabinet. Instead I used a PVC enclosure...

But for a 1 liter enclosure with two 3" fullrange speakers (stereo from 1 box...) I (and many others) think it sounds phenomenal!
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Old 26th April 2007, 11:22 PM   #18
v-bro is offline v-bro  Netherlands
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At least the 'tizz' is fully there, but I'm still working on it. I will get a measuring system soon myself.
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Old 27th April 2007, 12:24 AM   #19
Geoff H is offline Geoff H  Australia
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"In real life"

That's the bottom line. Cone treatment may help.
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Old 27th April 2007, 06:02 PM   #20
v-bro is offline v-bro  Netherlands
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I very dislike the idea of cone treatment, it's so permanent...And perhaps makes what sounds very rich now sound dull afterwards...

Perhaps I can start by sticking a piece of self adhesive foam on the dustcap (so it can be removed again...).

Anyway, I know about the difference between measurements and real life situations, I own ESL speakers for funk sake!

My posting these measurement is merely to give a slight insight in the system, intended for those (experts, gurus) who also know the difference. Not to draw conclusions out of, or claiming I did the right thing. I can think of a million things to get that line straight in the FR graph, but it doesn't have to sound better, I agree...

I do think (or actually know from experience) that a wooden enclosure would perform much better (both audible and measurable) for example...

What exactly is a twin t filter? I'd like to know...thanks....
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