I recently purchased your Davis 100CKW8DF 4" Kevlar/Carbon midbass speakers. (Parts express-297-560). I am going to be using these as the midrange speaker in a 3-way cabinet (tweeter, midrange, woofer. I requested enclosure information from parts express, however, what they sent me was a bass box pro enclosure which included a port!!! First, let me say that this puzzles me, because as far as I can conjecture, they have mistaken the application of the speaker. (Why would a midrange need a port?) Can you tell me if a ported enclosure is appropriate for your speaker in my application?? Second, even if I was using them in a woofer application, I prefer sealed enclosures. Third, I don't think that I really want to spend the time building a box inside a box, with a port!
So, what I have in mind is to use a 6" pvc pipe as a means to enclose the speaker. (The next smaller pipe that is available to me is a 4", which I think will be too difficult to work with, considering the magnet is about 3 1/4 in diameter, and the mounting holes of the speaker are 4 1/2"). Here is where you come in.
1. Do you see any problem with using a 6' pvc
pipe to enclose the speaker?
2. If you don't see a problem with that, can you
give me an optimum length of the "cylinder"?
(Please consider that the speaker will be
mounted on 3/4' particleboard, and recessed
1/8 to 1/4" so the front of the speaker will
be flush to the face of the cabinet).
3. If you can suggest an optimum length, can you
tell me if this determination is based on
an "optimum" enclosure (sealed) volume? (In
other words, what criteria did you use
4. If there is an optimum sealed volume, what is
it? (I may try to find 5" pipe, if possible,
Other factors: Since the back of the magnet is 2 7/8 behind the front plate of the speaker, this means that shortest the pipe can be is 2 1/8. The inside diameter of the 6" pipe is 6". (O.D. 6 5/8)
I also intend to spray the inside of the pipe with rubberized car undercoating, to "absorb" and dampen the sound waves. What is your take on this, and, would I need to or want to add any other damping material? Other than what I have mentioned, do you have any other recommendations? Thank you, and I want to say I am very impressed with your speakers!
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