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Old 16th February 2007, 10:40 PM   #1
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Default Which tweeters should I use?

I'm going to build an open baffle MTM with some Peerless 5.25" HDS Nomex mids, and either of these tweeters.

- Focal TC120TD5
- Raven 2.1

I have all the stuff here, just wondering if anybody has input on which set of tweeters I should use in this design? I'm leaning towards the Ravens, but love both tweeters.

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Old 16th February 2007, 10:59 PM   #2
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I have not been able to get the correct dispersion pattern with a ribbon in an MTM, and so I would recommend the Seas 27TDFC with LR-4 slope because of its low Fs and good Xmax, or use your Focal TC120TD5.

Dipoles put a great Xmax strain on the midrange drivers, and using a dome tweeter which can cross near 1.5K can lower the IM distortion generated from mixing large midbass cone movement with delicate upper frequency female voice.


The Raven 2.1 seem best suited for a higher crossover point on a 4-way like: 12" bass + 8" midbass + 4" mid + Raven
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Old 16th February 2007, 11:57 PM   #3
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I'm a bit of a ribbon noob ... didn't realize dispertion pattern would be a problem in an MTM, hmm. I was thinking MTM to get sensitivity up (both the Focal and Raven are very efficient), and to help deal with the 'air moving' demands of open baffle.

At this point every conceivable design parameter is changeable, except my driver choices I've never done an open baffle, and thought this would be a good way to apply my drivers. But I wouldn't be asking if I wasn't flexible.

Just FYI, I also have a pair of 12" TC2+ drivers that I was going to use up to about 150hz for this design.
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Old 17th February 2007, 01:46 AM   #4
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I have never used a Ribbon Tweeter, although they are supposed to sound incredible, many units have lower power handling.

However, in my custom speakers I've been using Audax 1" Titanium dome tweeters. I can say that while they sometimes have a harshness to some sounds (mainly symphonic orchestra or vocal pieces), they add a great high-end sizzle to synthesized sounds and percussion!

Does anyone have experience with Scan-Speak drivers? Also, the SEAS Millennium tweeter looks interesting.

I know that the Wilson Audio Alexandria uses Scan-Speak's top-of-the-line tweeter, they are spendy but have impressive frequency response up to 40khZ! (Not to mention they look very pretty )
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