Jump to content
The Klipsch Audio Community
Sign in to follow this  
Donkeyshins

Help needed: KP250 DIY cabinet question

Recommended Posts

I'm using a trio of KP250 speakers in my home theater and because of the limits of the room, I'm having to put the center channel speaker on it's side. Given that the speaker cabinet has been 'well loved', I was thinking about building a new cabinet for the speakers - one that is designed to fit into the space.

My idea is to move the midrange, tweeter and ports to one of the side panels and have the woofer firing either out the top or bottom (the latter would require me to put feet on the 'bottom' of the speaker so the woofer would have room to move / radiate).  Essentially, the speaker would be face down (or face up) with the ports, tweeter and midrange firing out a side.  Given that the internal dimensions would remain the same and the porting would remain the same - are there any pitfalls (other than making sure that the woofer magnet doesn't interfere with the midrange compression driver) to be worried about?

Unfortunately, I can't use an Academy center channel as (a) it isn't sensitive enough compared to the KP250, (B) it's too wide for the space even if it were a good match and © they're expensive as hell.

Thanks in advance for any advice,

 

-D

Share this post


Link to post
Share on other sites

Imho, that would likely prove unsatisfactory.  The human voice (primary focus of center channel) frequency range begins at about 250Hz.  With the woofer pointing up or down, your will lose much of the fundamentals of human voice relative to the harmonics coming from mid-range and tweeter.  I would think it better to simply lay the 250 on its side, if it will fit.

  • Like 1

Share this post


Link to post
Share on other sites

I agree with Bill.  The 12" driver is a woofer, not a subwoofer.  You'll want it pointing at you.

Share this post


Link to post
Share on other sites

You might be better off using the horns in the middle and flank them with two eight ich woofers insted of the single twelve. Obviously you would need to change out the crossover to work this way. This way everything faces forward and sound is directed towards you. I have a KLF 20 single speaker that I am going to use for a center and that is my plan I am following.

Share this post


Link to post
Share on other sites

You might be better off using the horns in the middle and flank them with two eight ich woofers insted of the single twelve. Obviously you would need to change out the crossover to work this way. This way everything faces forward and sound is directed towards you. I have a KLF 20 single speaker that I am going to use for a center and that is my plan I am following.

 

Unfortunately, there is insufficient space (width-wise) for this option.

 

Imho, that would likely prove unsatisfactory.  The human voice (primary focus of center channel) frequency range begins at about 250Hz.  With the woofer pointing up or down, your will lose much of the fundamentals of human voice relative to the harmonics coming from mid-range and tweeter.  I would think it better to simply lay the 250 on its side, if it will fit.

 

So the two ports on either side of the tweeter (see below) wouldn't pass these frequencies?

 

IMG_0251.jpg

 

-D

Edited by Donkeyshins

Share this post


Link to post
Share on other sites
So the two ports on either side of the tweeter wouldn't pass these frequencies?

 

Not the way you're thinking.  Most of the sound primarily comes off the face of the driver.

Share this post


Link to post
Share on other sites

Perhaps if you could attenuate the squaker and tweeter down say 3-4db, and aim the ports to the front, you might get away with it. Has anybody tried this? It would make the speaker a lot less efficient, so you would have to up the db of the center in your AVR. If you built a slot the the whole speaker to slide into and left a couple inches above it for the woofer's sound waves to come out??

 

I think it would be a cool experiment. Who knows, you may have solved the age old thin center for a Heritage speakers problem.

 

Bill and Carl are probably right, though.   :)

post-47699-0-57740000-1426039925_thumb.j

post-47699-0-30700000-1426040289_thumb.j

Edited by mustang guy

Share this post


Link to post
Share on other sites

"It would make the speaker a lot less efficient"

 

It will be the same, except there will be a ~6dB peak at some frequency (determined by the depth of the cavity the woofer is mounted in).

Share this post


Link to post
Share on other sites

I'm using a trio of KP250 speakers in my home theater and because of the limits of the room, I'm having to put the center channel speaker on it's side. Given that the speaker cabinet has been 'well loved', I was thinking about building a new cabinet for the speakers - one that is designed to fit into the space.

My idea is to move the midrange, tweeter and ports to one of the side panels and have the woofer firing either out the top or bottom (the latter would require me to put feet on the 'bottom' of the speaker so the woofer would have room to move / radiate).  Essentially, the speaker would be face down (or face up) with the ports, tweeter and midrange firing out a side.  Given that the internal dimensions would remain the same and the porting would remain the same - are there any pitfalls (other than making sure that the woofer magnet doesn't interfere with the midrange compression driver) to be worried about?

Unfortunately, I can't use an Academy center channel as (a) it isn't sensitive enough compared to the KP250, ( B) it's too wide for the space even if it were a good match and © they're expensive as hell.

Thanks in advance for any advice,

 

-D

it would be cheaper and a lot less trouble to just buy the kP101  -

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...