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Old 3rd February 2013, 12:19 PM   #1221
ravener is offline ravener  Singapore
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Originally Posted by xrk971 View Post
Ravener,
Looks good! I have never heard of the glue melting the foam. Are you talking about the foam on the white channel or the black back panel? My gun is only 10 watts if that matters.
Foam on the white channel, the black one have a layer of paper laminate on it.
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Old 3rd February 2013, 12:51 PM   #1222
xrk971 is offline xrk971  United States
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Squeak,
I had to pull the drivers from the Cornu's to put in the FIB's so I have not been able to do a true A/B comparo. But, my impression is that the BIB's have lower bass extension than the 20 in Cornu's, however they do not sound as "expansive" as the Cornu's. I think for certain music where a harder driving bass sound is needed, the FIB's are better, but for most music, the Cornu's sound better, especially jazz or anything with horns or woodwinds. I may pull the drivers from my cardboard MLTL's and put them in the Cornu's so that I can do a true A/B test and update this response. One thing that I have found with the FIB is that it is very sensitive to stuffing, I had to play with it quite a bit to get the sound I wanted. Maybe I just got lucky with how I did the stuffing on the Cornu's because it was good the first time.
UPDATE: I put another set of drivers in the Cornu's and did an A/B test with the FIB's. My impression from above is still correct. The lower bass on the FIB's is a definite advantage on songs that have deep kick drums or bass guitar that goes below 100 Hz. The sound stage of the Cornu's is still really special - it feels like you are listening to larger speakers in a larger room. Amazing what the spiral enclosure can do. The imaging and musicality of vocals between the two are about even. Although on many songs, the speakers are very close and with my eyes closed, it is hard to tell the difference other than a warmer coloration to FIB sound. I think this may be the characteristic 'BIB' signature sounds and really depends on how much damping and stuffing you apply - YMVV.
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Old 3rd February 2013, 12:54 PM   #1223
xrk971 is offline xrk971  United States
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Originally Posted by ravener View Post
Foam on the white channel, the black one have a layer of paper laminate on it.
Ravener,
It may be the type of glue you are using which has a higher melt temperature. It might be special industrial strength hot melt glue. The stuff I use is the budget all-purpose craft store stuff. You must be getting close! Looking forward to seeing the finished product, your listening impressions, and if you are able to do it - a mp3 sound clip
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Old 3rd February 2013, 04:35 PM   #1224
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Originally Posted by surface tension View Post
Finally, here's a photo of my 20" Vifa TC9FD masonite/foam hybrid with banana leaf paper.[/ATTACH]
Those look great.
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Originally Posted by ravener View Post
Using a 40W glue gun<snip>melting the foam.
Happ ens to me too. Just lay the bead and be patient enough for it to cool before moving the foam into place. Also, maybe do a spot weld and caulk method.
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Originally Posted by xrk971 View Post
Ravener,
It may be the type of glue you are using which has a higher melt temperature.
My thoughts also but remember he does have a 40 gun. I know the idea is to get the glue hot faster but it may be hotter overall too.
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Old 3rd February 2013, 11:58 PM   #1225
ravener is offline ravener  Singapore
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Quote:
Originally Posted by xrk971 View Post
Ravener,
It may be the type of glue you are using which has a higher melt temperature. It might be special industrial strength hot melt glue. The stuff I use is the budget all-purpose craft store stuff.
Quote:
Originally Posted by Cal Weldon View Post
Happ ens to me too. Just lay the bead and be patient enough for it to cool before moving the foam into place. Also, maybe do a spot weld and caulk method.

My thoughts also but remember he does have a 40 gun. I know the idea is to get the glue hot faster but it may be hotter overall too.
I got my glue gun and glue sticks from a local arts and crafts store.

Probably due to the heat of the gun, don't think there is a cutoff switch for when the gun gets too hot.

If i use it after leaving it for idle for more than 5min, the glue will come out with lots of tiny bubbles in them, and the glue stays fluid for about 3min even after i turn the switch off.

Anyway, will try to work on it in the evening after I get home from work, with Chinese New Year approaching at the weekends, I still have to clean my room. So much to do, so little time.
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Old 4th February 2013, 12:16 PM   #1226
ravener is offline ravener  Singapore
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A little update:

Have yet to seal up the enclosure yet, trying to figure out the mounting for the drivers as I do not have any spare screws lying around, therefore using back the original screws, which have about 1cm of threadless area for the original baffle.

probably gonna glue the screws tight (not going to keep the first prototype, planning to scrap it once I've figured out how to properly do everything and make a new pair).

Testing it out laid on a flat table, with the original beside, I can hear an obvious difference; the spiral enclosure has definitely a bigger soundstage(sounds like I'm in a concert hall). Source is my Galaxy S2 (FLAC) with a Fiio E11 headphone amp.

Now to seal up the thing and enjoy it monologue-ly, for the time being
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Old 4th February 2013, 12:25 PM   #1227
xrk971 is offline xrk971  United States
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Ravener,
Nice progress, wait until you seal it up, it will be a huge difference - much better sounding as all those air leaks rob any horn-bass you are getting. I am surprised that the fiio headphone amp can power those drivers.
I think it will work well. What did you say the path length was for the horn?
X
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Old 4th February 2013, 12:47 PM   #1228
ravener is offline ravener  Singapore
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Path length is rather short, roughly 0.431749m (16.998") based on the outer curve of the horn.
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Old 4th February 2013, 01:14 PM   #1229
xrk971 is offline xrk971  United States
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That will get you down to only about 200 Hz but the horn will serve more to amplify the back wave. That is the problem with Fibonacci, it gets really big in size to get any appreciable path length.
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Old 4th February 2013, 01:28 PM   #1230
ravener is offline ravener  Singapore
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heh, no harm trying it out.

though it's a little bit of a work out for a first project...

I'm not so worried about bass though, I have an old 8W Sonic Gear SP321(1st Order Reflex cab iirc) to fill in if i ever feel like it, it's not punchy, but it will do for now.
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