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Old 4th January 2013, 11:42 PM   #291
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by chazdrumzalot View Post
There are a couple of other nagging issues with this design which could/should be addressed, if possible. One thing on my mind is the problem of putting the driving smack in the middle of a large square. Baffle diffraction, anyone? Anyway, enough talk; time to mount some drivers.
Now that you are listening to them, are you still as concerned about baffle diffraction? The main reason I want to move it off center is to allow different length horns designed and modeled to precisely fill in each other's dips in the freq response. It would help things to offset the driver location and make box follow golden ratio.
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Old 5th January 2013, 01:48 AM   #292
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I've built the second little 8"er and got them up on the wall. They are held together with elastic bands right now while I test them. The best word to describe the sound is shrill. Listening to some string quartet music the soprano really screams at you while the cello is kind of lost in the mix. This could well be the cheap little drivers that I put in there. I'm sure they would sound better sealed up properly with some better speakers in them.
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Old 5th January 2013, 01:53 AM   #293
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My idea of using the table saw fence and mitre slot for cutting the foam is more bust than boom. Took me a clamp and 10 minutes to set up and then ruined two pieces before I gave up. Back to the straight edge method. Nothing I could do to make that work. I'm not an idiot but I sure felt like one.

Heading for the Captain Morgan now. Better luck tomorrow.

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Old 5th January 2013, 02:00 AM   #294
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by prezden View Post
I've built the second little 8"er and got them up on the wall. They are held together with elastic bands right now while I test them. The best word to describe the sound is shrill. Listening to some string quartet music the soprano really screams at you while the cello is kind of lost in the mix. This could well be the cheap little drivers that I put in there. I'm sure they would sound better sealed up properly with some better speakers in them.
I bet it is because it is not sealed. The leaks will kill any bass from the horn. Glue them and try again, the drivers should work fine.
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Old 5th January 2013, 02:06 AM   #295
prezden is offline prezden  Canada
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Would it help to take some of the dampening out? Right now the centre chamber is stuffed and the inner channels up to where the second channels begin.
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Old 5th January 2013, 02:13 AM   #296
prezden is offline prezden  Canada
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On a different note: I tried scoring the foam board by making shallow cuts with a t-square about an 1/8" apart across all of the channel pieces at once then cutting them to width after. This way the curves were pretty much the same on all the baffle pieces. Seemed to work pretty well
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Old 5th January 2013, 02:20 AM   #297
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by prezden View Post
Would it help to take some of the dampening out? Right now the centre chamber is stuffed and the inner channels up to where the second channels begin.
A little driver like that only needs some stuffing in chamber. Take it all out of channels.
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Old 5th January 2013, 06:06 PM   #298
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i finally glued my speakers (with visaton frs8)...after drying 1 came apart due to tension in the wood...argh.
But noting even more glue could not fix! So now there are playing there songs..

They play good, there is more bass dann before but they sound a bit hollow. Can be due to damping? i stuffed just the chamber with underfloor carpet. Or must i play a bit longer with my vistatons... these are my first new drivers normally i buy second hand or vintage..

But the project was great fun....accept from the blisters from the glue gun..
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Old 5th January 2013, 06:17 PM   #299
xrk971 is offline xrk971  United States
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Xerxes,
Congratulations! Photos?
Try fiber stuffing, also if it came apart did you reseal all internal channels? Leaks can sound hollow.
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Old 5th January 2013, 06:37 PM   #300
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Photo's will follow but in the dark with a mobile is a no go. I think that I sealed it well altought that is what difficult to see.. But the they sounds the same an the second must be sealed... I will try some different stuffing. ( I am thinking about the build procedure and if this can be done different with a 100% guarantee that it is sealed).

I will keep you posted
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