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Old 12th November 2012, 02:39 AM   #11
just another
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My position would be that if you want to get the best sound out of the drivers you will probably need to measure, simulate build and possibly tweak.

However having lived with a set of speakers for 20 years (that I was perfectly happy with) that I used off the shelf crossovers (a couple of different ones till I got something I was happy with) and multiple different drivers over that time as well, I would say that it is definitely possible to get something good without doing the measurements.

Everyone's definition of good is different, and for me good was better than everyone else I knew who had consumer audio. It wasn't until I listened to some truly high end stuff that I realised how lacking it still was.

As you said you wanted to learn something, I think the best thing to do is experiment and see how you go. I think that all of the playing I did in the early years helped me when I finally started to measure and design in a more engineering fashion.

Even something as simple as a computer microphone (even one on a webcam) with some free software like holm impulse, can give some visual feedback to what you are hearing and help you to understand what is going on.

The way to approach it is not to worry whether or not it is a success or a failure sonically, but whether you learn something or not. Even if sonically it is a failure, if you learn something from that, then in my books it is a success

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Old 12th November 2012, 03:09 AM   #12
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Here is a link to something akin to what you are trying to do...

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Old 13th November 2012, 07:49 PM   #13
TFG1067 is offline TFG1067  United States
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I agree Tony, thanks for your input!

Dave, I think your link is missing. Unless you meant the links in your signature, which are quite impressive. When I have more time I really want to make one of those miniOnken. Beautiful design
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Old 13th November 2012, 08:08 PM   #14
chrisb is offline chrisb  Canada
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Originally Posted by TFG1067 View Post
I agree Tony, thanks for your input!

Dave, I think your link is missing. Unless you meant the links in your signature, which are quite impressive. When I have more time I really want to make one of those miniOnken. Beautiful design


yes, he has been known to paste a blank field, or words to that effect.
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Old 13th November 2012, 08:30 PM   #15
von Ah is offline von Ah  United States
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I'm in the nascent stage of building something very similar to you,TFG... I like the term fiddlefarting.
I have some of the same TBs and another buyout special from PE (the 299-114 woofer) that I am adapting an old pair of ~ 12L two-way cabinets with. At the moment I'm playing with ideas for the internal compartment which will house the W3881si. 4" PVC couplers and caps are the leading scheme... I move at a glacial rate on audio projects, so you're likely to finish before me.
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Old 14th November 2012, 05:13 AM   #16
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The trouble with passive crossovers is that they need to take into account the impedance of the drivers at the crossover frequency, which is often substantially different than the published "nominal" rating (8 ohms for example). You also need to measure and adjust for different sensitivities. One driver may give 5-10 dB more output than the other. Having said that, being off a bunch isn't usually horrible. Many of my early speaker projects were very sloppy, and still pretty enjoyable. Down the road you might decide to get a calibrated mic and look at the acoustic output of each driver separately, and see how to improve the accuracy.
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Old 14th November 2012, 06:12 AM   #17
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Dave, I think your link is missing.
A thread for Tysen and variations on FAST

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Old 14th November 2012, 06:14 AM   #18
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4" PVC couplers and caps are the leading scheme...
Forget the caps, just run it out the back and damp till aperiodic.

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Old 15th November 2012, 08:54 PM   #19
von Ah is offline von Ah  United States
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Lightbulb Another crazy idea

I will probably go with that, Dave.
However, I just stumbled on this idea... What about using some of these foam baffles used for auto speakers? A lot less volume, but a lot easier to work with.

XTC 4" Round Foam Baffle Pair 260-782
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Old 15th November 2012, 09:54 PM   #20
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I will probably go with that, Dave.
However, I just stumbled on this idea... What about using some of these foam baffles used for auto speakers? A lot less volume, but a lot easier to work with.
If you are happy with the mid-tweeter sealed, i'd suggest a visit to the local dollar store and quest for an appropriately shaped piece of plastic kitchenware.

dave
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