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Foam Core Board Speaker Enclosures?
Foam Core Board Speaker Enclosures?
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Old 29th November 2012, 07:49 AM   #111
xrk971 is offline xrk971  United States
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Foam Core Board Speaker Enclosures?
Nice job! That was a good idea to start from inside, I started from outside to make sure the mouth had a 30 in long piece. Looks awesome! Congratulations on getting the channels completed.
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Old 29th November 2012, 07:55 AM   #112
klampykixx is offline klampykixx  Australia
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I started my foamcore project today. Ill have to wait for my internet to be connected before i can upload pics. I just estimated horn length so i hoping it sounds acceptable. Using 4x3inch instwad of the 4inch drivers. They sound fresher than the bigger ones. Which i think will be better suited for what ill be using them for.
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Old 29th November 2012, 07:59 AM   #113
klampykixx is offline klampykixx  Australia
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Just to add its a 75cm horn path and mountng the drivers in the mouth facing out hoping for it to just boost the bass output. Not aiming for deep deep response but a good bass output will be nice.
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Old 29th November 2012, 09:01 AM   #114
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by klampykixx View Post
Just to add its a 75cm horn path and mountng the drivers in the mouth facing out hoping for it to just boost the bass output. Not aiming for deep deep response but a good bass output will be nice.

Driver at the mouth like the B&W Nautilus where the horn is acting as an infinite tube? I guess we will see when you post pics. 75 cm has a characteristic freq of only 114 Hz, is that low enough bass for you?
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Old 29th November 2012, 09:13 AM   #115
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by Cal Weldon View Post
Speaker widow was in a good mood so I got a start. I found it easier to begin on the inside and spiral out, making sure I waited at each corner to catch up with the next piece so as to give my working room but I made sure I used a full piece at the mouth to cut down on visible seams.

I forgot to mention that I also double up on the glue by liberally applying white, or in your case, yellow glue on top of the hot melt just in case there are any cracks that need to be sealed, plus it ensures that if hot melt ever gives you have a backup bond. I assume you are waiting for cap to bond right now. You are right about getting the approval of the OWMBO prior to starting new campaigns.... This particular speaker has a very high WAF though.
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Old 29th November 2012, 11:06 AM   #116
klampykixx is offline klampykixx  Australia
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Im not familair of the cab you described but to the "tuning" frequency, no thats not really low enough but it was the longest i could draw up in the space i have as well as keeping it stereo and fitting four drivers in there... Lol it will more than do the job me thinks.
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Old 29th November 2012, 12:40 PM   #117
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by klampykixx View Post
Im not familair of the cab you described but to the "tuning" frequency, no thats not really low enough but it was the longest i could draw up in the space i have as well as keeping it stereo and fitting four drivers in there... Lol it will more than do the job me thinks.
75 cm (29.5 in) is actually adequate for a mass loaded transmission line like the TABAQ (circa 32 in) which uses a restriction on terminus to 'mass load' the TL to bring the resonant tuning frequency down to about 55 Hz. You really should take a look at the TABAQ TL thread. The design has been built by many folks over the years (I think the thread has like 130,000 views) and was designed for small 3 to 4 in drivers to get deep bass. Your requirement of 4 drivers does make it more difficult to fit all that in.

The design can be found here:

http://coolcat.dk/bjoern/TABAQ_TL_for_TB.pdf

http://www.coolcat.dk/bjoern/TABAQ%2...et%20build.pdf
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Old 29th November 2012, 12:45 PM   #118
Cal Weldon is offline Cal Weldon  Canada
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Quote:
Originally Posted by xrk971 View Post
I assume you are waiting for cap to bond right now.
Goodness no. WYSIWYG, I will try and do the other spiral today. We'll see about doing the caps. Yes, I used some hot glue where there are gaps but I'm not too worried, there is a similar SPL on either side of the channels inside the the horn isn't there?
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Old 29th November 2012, 01:18 PM   #119
xrk971 is offline xrk971  United States
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It's not about SPL (as there is very little pressure build-up in horns in general since they are so open) but I worry about small air leaks which can cause the low frequencies to have a hard time in establishing a standing wave. If you have played a flute or any other woodwind instrument you know that a tiny leak on the finger seal above the low note you are trying to play causes the note to collapse. I am just being careful and using plain hot melt is fine as long as there are no obvious leaks.
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Old 29th November 2012, 01:38 PM   #120
Cal Weldon is offline Cal Weldon  Canada
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I tried to be careful and added extra where I saw gaps as I went along so I'm hoping I have done it well enough.
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