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So I made these a while back and I have just started working on the next step. The drivers are Fatial. 140 and 142 horn and the 15' woofers are 15fh500 or 15fh510. The second order xover has the polarity inversed. Jeff Oster designed and built it - he is the Fatial rep. He also helped with the design of the speaker.The horns are on sleds to allow test with time alignment and angle. I think I will place them in the box at some point.
These cabinets are for testing and trials. Made from Baltic birch. My first set of speakers were Cornscala. Guess the speakers are 105db.
Not as much very low end as I would have guessed, but the bass is so clear and defined. Speakers sound great and I am just starting to work on the horn position. Cabling is very basic - the final will use Kimber 8TC.
Any comments or suggestions. I have thought about rebuilding the xovers with nicer caps and resistors, but I am not sure of the need.
I have moved the speakers to the corners of the room.
Thanks.
Don Walker
Edits: 07/15/12Follow Ups:
I might go with a push-pull connection on the woofers (see TAD center photo) and a 2.5-way crossover (125hz and 900hz).
The Q=2 filter adds 6dB of boost at 32hz.
Push Pull. New concept for me. I guess the advantage is cleaner sound because there is more control. Thanks for the picture and more ideas!
Mot making much headway on moving up to the expertise of this group.
Any suggestions on resources to learn or people that might like to design a xover (and would be good)?
Just tried some Solid State on the speakers and really they sound very good. Which makes me think they are worth more work.
I enjoy the designs on this forum.
Don Walker
I would hope they are the 15FH500, they could be flat to 35hz with a 6th order vented alignment.
The network looks very primitive, the 140/142 needs a gentle notch in the 1Khz~3Khz range, and it has a 16Khz resonance.
What is the net box size and the Fb?
The inside measures 46x16.5x15.5 = 11764 sq inches. The shelf port opening is 15x2.25 and the shelf is 10.5. All in inches.
I search my email and found that they are 15FH500.
The current sound is good. I am always looking for more. How would you suggest creating a new xover. I need to learn what the 16khz resonance means. I am an Eningeer but I have just programmed for years.
Would a different horn help?
I also have only a app on my iTouch to do a test graph.
I can only guess at the Fb
I might be a little optimistic!
Don Walker
Your box is tuned to about 32hz, that's fine.But,
I would add a Q=2 high-pass filter at 32hz to make it flat to 32hz, right now you are about 10dB down at 32hz with respect to the mid-band output. The filter would convert the system to the 6th order vented design I referred to in my first post, it would also protect the system from infrasonic signals.
Resonance or ringing is what I was referring to at 16Khz. I suspect the driver, not the horn. Big titanium diaphragms have a resonance at high frequencies. In this case you can see it in the frequency response graph (although they have artificially smoothed the graph quite a bit), and in the impedance plot.
I've been meaning to try the LTH142 horn, but with the HF144 driver. It doesn't have the peak at 16Khz, or the glitch in the impedance plot.
Who have you been getting your Faital Pro from?
What amps are those?
Are the HF140 8Ω or 16Ω?
Edits: 07/17/12 07/17/12
Sorry for the slow response, somehow I missed your post. We just got in from a nice run in the mountains.
The amps are Quicksilver Horns. I have found that maybe they work better with these speakers using KT88 and the 4ohm tap, but I just tried this configuration. The QS Mid Mono work very well with these speakers and most speakers.
I am a dealer. I get the Faital from Faital (Jeff Ostler). I do not sell much gear so do not get the wrong idea. I have a very modest income. I have a part time programming day job.
Glad the box is tuned correctly. I do expect more low bass from these speakers. I made them close to the size of the woofer , so that the sides really hold the woofers. I have not put a single brace in the box, yet. I do not hear any cabinet resonance.
The 140 are 8ohm.
I went for the 140 because Bob Crites likes them and the graph appears flatter than the 144. And more extended. I was looking at using a xover point around 500hz like Bob uses on the Cornscala D. The idea is that the lower xover reduces the problem with time alignment. Jeff talked me out of the 500hz and into going up a bit to 900Hz or so.
I need to do some more reading so that I can understand the Q=2 high pass filter and the 6th order vented design. You had suggested a different xover for the 1k to 3k range for the 140/142. Any hints?
Thank you for your time. These are fun projects. Wish work and trying to sell gear left more bandwidth for the PROJECTS.
Don Walker
I've been looking at that combo myself for use above the AE TD15s at 800-900hz. Id like to hear them somewheree first...
You are welcome to stop in. Bring some files or LPs.
I have not considered shipping a set out, might happen...
Don Walker
If I see your crossover pic correctly you have 2 air core coils parallel to each other. You should put the at 90 degrees to each other to minimize cross induction which wil foul up the values of the inducters as you play the speakers.
Thanks. Yes I will do this. Not sure why it was built this way. The speaker sound good as is. I can not wait to make some changes.
Don Walker
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