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-   -   how this design looks ( PI ) (http://www.diyaudio.com/forums/subwoofers/224636-how-design-looks-pi.html)

maxo 30th November 2012 01:09 AM

how this design looks ( PI )
 
PiSpeakers Forum - 12 ? observations and comparisons with other designs - Wayne Parham, July 08, 2005 at 03:53:47

and look like you can get the plans
http://audioroundtable.com/forum/ind...17928&start=0&

maxo 30th November 2012 10:52 PM

have anyone made one of those ?

norman bates 30th November 2012 11:09 PM

eh, I doubt they couple as well as the simulation says.

And the corner loading, that better be 3 walls of concrete also.
Bass will blast right through walls otherwise (lose another 3db or more below 100hz).


Take the kf940.
It is a double 12" bass horn made by EAW.
32" x 36" x 52" at 300lbs each.
It has a 13' long mouth with maybe 6ft2 mouth area.
Notice it couples well at 200hz, but hardly at all at 25hz.
This is off of THEIR spec sheets, not someone else's tests.

EAW: KF940

http://i959.photobucket.com/albums/a...ates/KF940.jpg

But you can add eq (see their literature).
And 4 dual 12 bass horns can take 12db of boost at 30hz better than 1 dual 12" box.

I wouldn't ever build a sub-horn.
For the same area, you can get a bunch of 15's and add eq.
But I would build a bass horn on concrete floor (4-6ft2 mouth) and run it 100hz - 750hz if it could get up that high.

I like the tactile feel of bass.
I had a w-bin with 6-7ft2 of mouth.
I heard/felt no bass untill I was over 10' away.
And I was pounded listening down the hallway.
Pounded, not rumbled (not much below 100hz).

Bass horns are a different animal.

maxo 30th November 2012 11:12 PM

so that means the pi design is too bulky to be practicall
?
EAW is pricey and not in my league

norman bates 30th November 2012 11:20 PM

I think so.

Bass horns (under 100hz) seem unpractical.

maxo 30th November 2012 11:21 PM

so i better stick to a TH sub design like the SS15

norman bates 1st December 2012 01:32 AM

TH are nice, but limited bandwidth (in my opinion).
You have to cross them a bit b4 they get those 5-10db spikes.

But many love their sheer output.

I've never built or heard one, but they look interesting.
I'd require one or 2 15's, and that would be a BIG box.

It's up to you what you want (how low, how loud, how big, how expensive).

epa 3rd December 2012 02:14 PM

agreed with norman .
in the old days power was expencive and speakers had much les powerhandling and x-max.
nowadays power is cheap ,speakers have much more powerhandling and x-max.
if your gona use your sub to 100~125 hz for pa ,a th is great.
otherwise just bild br boxes(or ppsl)

grtz erik

sippy 3rd December 2012 02:48 PM

I have 2 plan sets from Pi Audio, model 6 corner horn and model 8.
IF you read ALL the blurb about the Model 12, it says it's an Out Door device..... there was talk by Mr. Parham of horns to go atop the 12.
SCARY STUFF!!!!

maxo 3rd December 2012 03:03 PM

Quote:

Originally Posted by norman bates (Post 3265012)
TH are nice, but limited bandwidth (in my opinion).
You have to cross them a bit b4 they get those 5-10db spikes.

But many love their sheer output.

I've never built or heard one, but they look interesting.
I'd require one or 2 15's, and that would be a BIG box.

It's up to you what you want (how low, how loud, how big, how expensive).

i want to go budget
and to have small size for portability but maximize spl
yeah i know you cant break the laws of physics

size,spl,price

from the top 3 i can choose 2 only
and the third will suffer

if i choose small size and high spl,,, it will be pricey
if i choose low price and small size, spl suffer
:(


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