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Re: 4 Pi Home Theater Build [message #67725 is a reply to message #67710] Wed, 18 May 2011 20:16 Go to previous messageGo to next message
NWCgrad is currently offline  NWCgrad
Messages: 143
Registered: March 2010
Location: Frederick, United States ...
Master
I will be gluing the front baffle on this weekend. Since I have doubled the thickness of the baffle from 0.75" to 1.5" I made the port exactly 0.75" shorter - thus the overall length from the front of the baffle to the end of the port is 10" (as in the original plan).

Is this correct or are there other factors at play that I failed to take into account? Shocked

Thanks,


VIRIBUS MARI VICTORIA
Re: 4 Pi Home Theater Build [message #67726 is a reply to message #67725] Wed, 18 May 2011 21:02 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18670
Registered: January 2001
Illuminati (33rd Degree)

That's right. You want the duct to be 10" long from entrance to exit. It's the airpath length we're concerned with, and the fact that the baffle makes up part of it is fine, as long as the total path length is right.

Re: 4 Pi Home Theater Build [message #67727 is a reply to message #67726] Wed, 18 May 2011 21:09 Go to previous messageGo to next message
NWCgrad is currently offline  NWCgrad
Messages: 143
Registered: March 2010
Location: Frederick, United States ...
Master
Thanks Wayne, I thought that was the case but better to ask now than be sorry later.

VIRIBUS MARI VICTORIA
Re: 4 Pi Home Theater Build [message #67780 is a reply to message #67727] Sat, 21 May 2011 22:26 Go to previous messageGo to next message
NWCgrad is currently offline  NWCgrad
Messages: 143
Registered: March 2010
Location: Frederick, United States ...
Master
Made some progress on the enclosures today.

Internal Frame - designed to increase structural robustness of the MDF as the speakers will be subjected to mutliple military moves.

index.php?t=getfile&id=412&private=0

index.php?t=getfile&id=413&private=0

index.php?t=getfile&id=414&private=0


VIRIBUS MARI VICTORIA
Re: 4 Pi Home Theater Build [message #67781 is a reply to message #67780] Sat, 21 May 2011 22:30 Go to previous messageGo to next message
NWCgrad is currently offline  NWCgrad
Messages: 143
Registered: March 2010
Location: Frederick, United States ...
Master
Gluing in the ports:

index.php?t=getfile&id=415&private=0

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VIRIBUS MARI VICTORIA
Re: 4 Pi Home Theater Build [message #67782 is a reply to message #67781] Sat, 21 May 2011 22:39 Go to previous messageGo to next message
NWCgrad is currently offline  NWCgrad
Messages: 143
Registered: March 2010
Location: Frederick, United States ...
Master
Final pictures for today, gluing in the back baffle (solid 0.75" baffle will be glued to this cut-out baffle).

index.php?t=getfile&id=419&private=0

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VIRIBUS MARI VICTORIA
Re: 4 Pi Home Theater Build [message #67804 is a reply to message #67782] Mon, 23 May 2011 11:01 Go to previous messageGo to next message
NWCgrad is currently offline  NWCgrad
Messages: 143
Registered: March 2010
Location: Frederick, United States ...
Master
Was able to get the inner front baffle glued/screwed before I had to return to Newport for the week (left nice warm Maryland for cold, drizzly Rhode Island Sad ).

index.php?t=getfile&id=425&private=0


- I use a paint brush to apply an even coating of Titebond III glue (2x on the MDF edges as it soaks in during the time required to apply all the glue).

index.php?t=getfile&id=426&private=0

index.php?t=getfile&id=427&private=0

index.php?t=getfile&id=428&private=0

The final picture shows my 18-year old Paradigm 9se MkIII speakers these will replace, my 24" sealed sub (Exodus Audio, Maelstrom-X 18" driver), a bit of my Paradigm PDR 12 sub, and my projection screen. Only the two 4 Pi speakers and the PDR 12 sub will be making the move to Cambodia, the remainder will be going into long-term storage.


VIRIBUS MARI VICTORIA
Re: 4 Pi Home Theater Build [message #67806 is a reply to message #67804] Mon, 23 May 2011 11:42 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18670
Registered: January 2001
Illuminati (33rd Degree)

Looking good! Getting close now!

Re: 4 Pi Home Theater Build [message #67811 is a reply to message #67806] Mon, 23 May 2011 15:22 Go to previous messageGo to next message
NWCgrad is currently offline  NWCgrad
Messages: 143
Registered: March 2010
Location: Frederick, United States ...
Master
Thanks...they are coming along and I cannot wait to get my shipment so I can give them a listen!

Next weekend I will add the bracing. I am thinking of using one .75" x 2.5" [a] oak piece side to side w/ three 0.75" x 1.5" [b] oak pieces as shown:

index.php?t=getfile&id=430&private=0

As I already have the wood as leftover from a different project I figured three front-to-back is better than one, it does add an extra 0.025 ft^3 of volume but I think this is probably negligible.

Could this bracing modification do more harm than good?


VIRIBUS MARI VICTORIA
Re: 4 Pi Home Theater Build [message #67816 is a reply to message #67811] Mon, 23 May 2011 17:17 Go to previous messageGo to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18670
Registered: January 2001
Illuminati (33rd Degree)

I think that's fine. Don't know if it's better or worse than a cross-brace but I do know it makes a better "rest" for the R11 that should be placed there.

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