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Old 23rd February 2008, 02:23 AM   #41
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Old 25th February 2008, 09:27 AM   #42
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Quote:
Originally posted by Cal Weldon


It wasn't. It's just that every time I see a picture of a scantily clad woman, I start to think about, well, you know, and I don't associate that with a DIY activity.
You don't consider scantily clad women something you would 'do it yourself'? Pun oh so very much intended.

I've commited something of a sin for this fullrange board, I've ordered a pair of Seas 22TAF/G tweeters. Going to play around with that to see if I can improve something. I'm now looking for crossover options, and am thinking about a 6dB at 3~4kHz. Though I have some experience in the field of filters (mainly active ones / micro electronica though), crossovers are partly magic to me when it comes to level matching and (different) driver impedance and their effect on the crossover.

If anyone could point me to a good information source about crossovers (or has oddly enough done exactly the same thing and just so happens to have the perfect schematic for me), it'd be much appreciated. I figure I'll have to play a bit with different crossovers, but I'd like to get it right in the first few tries. I do have a scope, frequency generator, and all that jazz. I don't have decent gear to measure the actual sound output of the speakers though, aside from a cheap microphone and a laptop with internal soundcard (which I trust far less than I trust my stereo regarding linearity).

It may be worth investing in good measurement equipment (better microphone and decent external soundcard), but at the moment I'm a student who is also saving for a 2 month roadtrip this summer so I don't have too much to spare.
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Old 25th February 2008, 01:15 PM   #43
Colin is offline Colin  United Kingdom
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Good write up, digitalmind, well done with the build and comments. I've just returned from the Netherlands, had I known this was going on I might have planned a listening diversion ...

The only way I know to get around the extreme toe-in (apart from the wheels) is to place the enclosures back to back and use reflectors. The TV would have to go on top so you may need a periscope!

I tried the reflector system years ago (following a Ted Jordan article) and it worked quite well, but I haven't tried it lately with higher resolution gear and modern drivers.

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Old 25th February 2008, 01:24 PM   #44
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Thanks, you would've been most welcome.

A reflector... I had never thought of that. Ha, that's pretty intereting.
I know of one guy who placed his speakers side by side (both pointed forward, speakers just CM's apart) and placed a screen in the middle to create a complete seperation between the two channels. The listening seat is placed at the end of the screen, so that you get something like this when you're sitting in the seat: [speaker]||[speaker].
I've heard part of that system (not the speakers, but I did hear the turntable w/ diy tonearm, diy preamp/poweramp, and headphones), but some other people who have heard the speakers were wildly enthusiastic. That is, if you can manage to listen sitting in one spot all the time.

Guess there's more to speaker placement than the usual setup...

I don't mind the wheels though, it also allows me to space them farther apart which greatly improves the soundstage.
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Old 27th February 2008, 08:24 PM   #45
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Forgive me, for I have sinned.

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Click the image to open in full size.



Going to give them a bunch of hours over the next few days, and play with placement and the crossover before I can say much about it.
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Old 6th March 2008, 10:47 AM   #46
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Have sinned some more:

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Click the image to open in full size.

Picking up the parts for a new crossover, 12dB/oct at 5kHz, tonight. Also picking up plenty resistors to play with the output level of the tweeter, which is too loud as it stands. I'm still on the edge about going with either 4kHz or 5kHz, but I found 3kHz much too low for my liking, so I'll try 5kHz first.

On the downside of things, I managed to melt my soldering iron yesterday so a need a new one of that too. On the upside, that was the only thing that has been destroyed since I started building these speakers.
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Old 6th March 2008, 12:20 PM   #47
hm is offline hm  Europe
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Hello,

donīt you think for such a solution the JX 92 is to expensive,
up to 5 kHz there are a lot of cheaper driver?

make a step response you will see a lost of the single driver advantages.
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Old 6th March 2008, 12:58 PM   #48
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Quote:
Originally posted by hm
Hello,

donīt you think for such a solution the JX 92 is to expensive,
up to 5 kHz there are a lot of cheaper driver?

make a step response you will see a lost of the single driver advantages.
Horst,
I like the JX92s, and it's not a seriously expensive driver. I already had it, and had it working well and liking it a lot, so why would I go for a different unit? The tweeter is more of an expiriment than anything else. Just because I want to see if I can do something fun with it. I did not purchase the JX92s purely for this project.

I don't care much for "losing" the advantages of a single driver. Single driver speakers are fun and have advantages over two or three ways, but the same is true for the other way around. Two/three way speakers also have their advantages....

Also, I don't hear many complaints about other designs using the JX92s together with a tweeter.
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Old 7th March 2008, 05:17 PM   #49
Ivo is offline Ivo  Netherlands
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Quote:
Originally posted by Scottmoose
Differential tuning is an interesting idea; Voigt looked into it back in the 1930s, but very few cabinets have been designed featuring it.
The Cornu spiral horns feature this. It works well, IMO. I build speakers with a fullrange driver a and separate bass unit now, but the Cornu horns do excellent with just the little Fostex units. And I'm into Schmackshorns etc.!
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Old 7th March 2008, 05:31 PM   #50
Ivo is offline Ivo  Netherlands
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Of course, Horst works with differential tuning as well, only he works with two drivers driving the two hornpaths. Doubling the driver expense and adding a bipole/dipole/omnipole effect. Whether that's desirable, is a matter of taste. I haven't built his horns, so I cannot comment. I have heard various Cornu designs, especially the spirals with the little Fostex units and they are simply superb.
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