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Old 28th February 2009, 07:11 PM   #1
HaLo6 is offline HaLo6  United States
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Question Building tips please!!!

I am building my first set of speakers. Just got the cabinets picked up from Lee Taylor! Beautiful... I had them built sine I dont have the woodworking skills yet!

Question: I am putting Whispermat and foam inside the speaker. Is it important to cover every inch of exposed MDF? I have Whispermat on the rear and bottom face and 1/2" foam on the sides and top. I have a couple slivers that are exposed around the rear input and ports.

Just wondering what everyone's technique is here! Attached are finished and unfinished pictures!

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Old 1st March 2009, 04:39 AM   #2
HaLo6 is offline HaLo6  United States
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no one has any help? 54 Views?
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Old 1st March 2009, 07:38 AM   #3
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Hi HaLo6! Nice looking cabs you have there!

It sounds as if what you have stuffed in 'em so far is a good starting point. It's sort of hard to tell without knowing what the drivers are and what their SPL's they kick out.

Stuffing a speaker is often a matter of taste and testing. Also of consideration is the cross-overs and the drivers. The weakest link in the chain can drag the rest of the speaker down with it and getting the mix right is what speaker design is all about.

Assuming that you have the drivers and x-overs right (and the port) then it's going to mostly be stuff to taste. Start low - test - add a bit more - test some more, etc.

Hope this helps.
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Old 1st March 2009, 02:33 PM   #4
HaLo6 is offline HaLo6  United States
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I am building the Zaph Revalator Kit, so ScanSpeak D3004/6600 “AirCirc” Tweeters and 2 18W/8531G 7” Revelator Woofers . Crossovers schematics are provided below.
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File Type: jpg crossover.jpg (46.1 KB, 149 views)
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Old 1st March 2009, 02:51 PM   #5
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Zalph provides a lot of info at his site for this speaker http://www.zaphaudio.com/ZRT.html

For the 2-way he states "I call for heavy stuffing at the bottom of the enclosure to reduce the lengthwise pressure node at 140Hz. Not doing so would cause some audible raggedness in the midbass. The difference between enough and not enough stuffing is easily seen in an impedance curve. "

I didn't see much on the 2.5 way design about stuffing. Zalph is very supportive and if you drop him an inquiry I'm sure he would get around to answering your questions.

In the mean time the previous advice applies. Stuff a little - test - stuff and test until you are happy with the results. Enjoy! When you get these speakers dialed in they are going to be very nice!
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Old 1st March 2009, 04:57 PM   #6
HaLo6 is offline HaLo6  United States
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I was refuring more to the foam backing rather than the acousti-stuff material if you have additional guidance ... I just want to make sure some exposed MDF is ok
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Old 1st March 2009, 05:41 PM   #7
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1/2" foam will essentially be invisible at lower frequencies, so I wouldn't worry too much. At the higher frequencies, there probably isn't enough energy to radiate back through the cones. If you are worried about it, get some polyfil and experiment.
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