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HWK15 bottom port modified? (Read 6987 times)
HT-EXT
Ex Member



HWK15 bottom port modified?
11/17/06 at 17:12:59
 
I want to know if anyone has experimented with using extended flared ports in the bottom chamber. I recently wanted the HWK15 to play lower for HT. I put two 4" x 9.5" (flare to flare) ports and fell in love with the results. A shift from 50/63Hz down to 31/40/50Hz(40Hz peak). Just as I started to change the top port I check the output and it to was down also around 40/50Hz(50Hz peak) from 63/80 (6"x 6" port). Is the extra back pressure in the bottom causing the top to also play lower or is it my imagination? If anyone has some mod info please pass it on to me. Replies welcome.       HT-EXT
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Bob in St. Louis
Ex Member



Re: HWK15 bottom port modified?
Reply #1 - 11/17/06 at 21:58:57
 
John helped me with some good mods (for HT).

It's about time to close down shop tonight or I'd elaborate more.

I'll probably check back here in the AM.
For now, if you check the last severl pages of my two very lenthy threads in the HWK forum you'll find John's mods in one of them.

Bob (good night all) TIME TO CLOCK OUT!!!!  ;D
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60ndown
Ex Member



Re: HWK15 bottom port modified?
Reply #2 - 11/18/06 at 02:26:36
 
im sorry, i must be missing something very important? when steve deckert sais,

"Responses range from narrow bandwidth to wide bandwidth with typical responses down to 13 HZ on the all three models. Box can be built for 8's,10's, 12's, 15's or 18 inch woofers.  Note: The design is for a 15, however the the box can be scaled down (and so the performance) to smaller drivers but you will have to specifically tune anything below the original 15" design.
Using musical instrument woofers (ex. PEAVEY BLACK WIDOW) you get tight full accurate bass from 200 down to 40 HZ. Using subwoofers you get big warm full bass that can on command create Subsonic pressures lower than 20 cycles."

i go with that,

why modd something that already works? it already gets down real low?

if we ever have to get into a spaceship and go into space, i want to go in the craft that was designd by scientists, not modders!


im a little tired........

im off 2 bed
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bassboy
Ex Member



Re: HWK15 bottom port modified?
Reply #3 - 11/18/06 at 03:16:14
 
60, we've already been through this, remember?  This sport is all about tweaking.  If you are serious enough to swap drivers in search of something better, it's only a small step to trying different ports.  And from there to more serious mods like Bob's, which is still not really that different.  If you can successfully mod something to suit your personal taste, why not?

From my own personal experience I can tell you that since I have achieved greater bass extension I never turn it up as loud as I did before.  It is just more satisfying at any volume level.
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HT-EXT
Ex Member



Re: HWK15 bottom port modified?
Reply #4 - 11/18/06 at 11:54:41
 
Thanks for the replies and if I oaf-fended anyone by changing an excellent design I aplogize. I believe you build a enclosure for two reasons. First is to listen to it. Second is to tweak it and listen to it again. I am the type if I bought a tank I would want to put a bigger cannon on it eventually. I am modding it to fit my environment and taste. Bassboy had a good point, it takes less power, plays a little lower and is more pleasing to my ears in my environment. I sure BOB changed his to fit his taste and set up. You go BOB and tell them where you got it from! Experimentation and imagination is the only thing that keeps me getting out of bed every morning. This is the mod-oaf over and out.     HT-EXT
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Bob in St. Louis
Ex Member



Re: HWK15 bottom port modified?
Reply #5 - 11/18/06 at 12:56:01
 
Quote:
if we ever have to get into a spaceship and go into space, i want to go in the craft that was designd by scientists, not modders!

The first thing that come to mind is: Apollo, Challenger, Columbia  ::)

Since modding a sub has no real potential of physical risk, and no threat of death, shall we continue?

HT-EXT, here's a link to the numbers I tested after John's mods in my room, for my situation. Check post #253:
http://www.decware.com/cgi-bin/yabb/YaBB.cgi?board=Housewrecker;action=display;n...

That being said, I've had numerous members PMing and emailing me regarding the specifics of the mods. I'll cut and paste the specifics of the mods.

Since most of the LFEs seemed to come from the 'bottom' holes, I flipped it over. I thought the sound was being trapped behind my seating, so flipping it would put the sound over your/my head.

The actual mods done were:
- Tube removed from upper port (the real upper)
- One lower port sealed (Pick one 4" hole. Doesn't matter)
- Other port, install lenth of 4" PVC 13"-17" (you can play with final lenth. If memory serves, I think mine is 17"
- Drivers isoloaded(clamshelled) on top baffle. (the real top)
- Flipped it upside down.
- Build a "stand" from MDF. The stand is (4) pieces that are square, slightly larger dimentions as the HWK. (2) pieces (platform) glued together with {8} six inch long dowel rods 1.5" diameter are the 'columns' seperating the other platform. A hole in the top of the stand (same diameter as the hole in the top of the HWK) is centered so when I flipped it, the top (now bottom) hole isn't covered.

The only money spent was for a lenth of 4" PCV. No harm, No foul, No death, No life ending events.
All mods can be undone if desired to get the device back to "unmodified sonic purity".

Bob
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HT-EXT
Ex Member



Re: HWK15 bottom port modified?
Reply #6 - 11/18/06 at 13:07:21
 
Thanks Bob. Did you take any pictures of mods as you were building the HWKBOB. Oh yeah, I eyeballed your pics and that is a sweet set up for HT. What have you decided to build next and don't tell me you have not thought about it?     HT-EXT

P.S. My spaceship will be faster because it is "MODIFIED".
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« Last Edit: 11/18/06 at 14:24:41 by Joe_Eaton »  
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paulc
Ex Member



Re: HWK15 bottom port modified?
Reply #7 - 11/18/06 at 14:27:35
 
That "Bob" guy talks stuff but to my knowledge he has never posted any pictures of his "bastardized" HW.

I think he is just pullin our legs and waitin for us to mess up our homebuilt speakers.  I'll bet he is just laughing his arse off at us.
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gexter
Ex Member



Re: HWK15 bottom port modified?
Reply #8 - 11/18/06 at 18:40:40
 

he Homewreaker lends itself to tweaking more than the other designs.
the 15 requires the least because it is designed for the 15. As we know all drivers are not created equal.
One thing about Steves designs is that they are flexible and he decreases the fart factor for the less adventureous. And those
who cannot spell adventureous.
building by the book is the way to start, but it gets to be downright fun when you play around. I love, to play oh I love to play.

Play play and play....
I believe in you Bob, I believe, oh yes I believe..
ya I know your jus playin paulc Smiley
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paulc
Ex Member



Re: HWK15 bottom port modified?
Reply #9 - 11/18/06 at 19:45:43
 
and that "Gexter" fella might be a myth also.
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gexter
Ex Member



Re: HWK15 bottom port modified?
Reply #10 - 11/18/06 at 20:29:35
 
Yes
I am the myth inc link to everyones myth conceptions of the fallacy of myth information.

I am but a myth to some but well known in myth applications of what is deemed reality.

PS
Good one LOL
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paulc
Ex Member



Re: HWK15 bottom port modified?
Reply #11 - 11/19/06 at 11:47:25
 
Well, the Gexter might not be all that bad after all.


BUT, it's been 24 hours and that "Bob" guy has not responded.  That speaks volumes!
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Bob in St. Louis
Ex Member



Re: HWK15 bottom port modified?
Reply #12 - 11/19/06 at 12:04:14
 
[quote author=paulc  link=1163787179/0#11 date=1163936845]That speaks volumes! [/quote]

........be right there Dennis, lemme get some coffee,.. jeeezzz!
Keep your pants on.
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Bob in St. Louis
Ex Member



Re: HWK15 bottom port modified?
Reply #13 - 11/19/06 at 12:20:45
 
HT-EXT, sorry, no pictures. Really all you'd see is a standard HWK with two drivers clamshelled, a piece of MDF blocking a port (from inside), and a foot and a half section of 4" PVC.
It's not a radical "looking" design.
The stand, I think, is cool looking though. You can't really see it. It's back in a dark corner, under the HWK, behind all the seating, painted black.

Thanks for the support Guy! It's nice to know I've got a friend, albiet a distant friend. These local fellows are "fair weather chaps" you know. Tongue Kiss Smiley

Dennis, you should tell your doctor to lower your perscription of "synical".

Bob
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paulc
Ex Member



Re: HWK15 bottom port modified?
Reply #14 - 11/19/06 at 12:25:43
 
In December I'll come bearing incence, muir and jolida.
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