how this design looks ( PI ) - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 30th November 2012, 02:09 AM   #1
maxo is offline maxo  United States
diyAudio Member
 
Join Date: Sep 2012
Location: A Hole in Texas
Default 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&

Last edited by maxo; 30th November 2012 at 02:15 AM.
  Reply With Quote
Old 30th November 2012, 11:52 PM   #2
maxo is offline maxo  United States
diyAudio Member
 
Join Date: Sep 2012
Location: A Hole in Texas
have anyone made one of those ?
  Reply With Quote
Old 1st December 2012, 12:09 AM   #3
diyAudio Member
 
norman bates's Avatar
 
Join Date: Nov 2003
Location: iowa
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

Click the image to open in full size.

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.

Last edited by norman bates; 1st December 2012 at 12:20 AM.
  Reply With Quote
Old 1st December 2012, 12:12 AM   #4
maxo is offline maxo  United States
diyAudio Member
 
Join Date: Sep 2012
Location: A Hole in Texas
so that means the pi design is too bulky to be practicall
?
EAW is pricey and not in my league
  Reply With Quote
Old 1st December 2012, 12:20 AM   #5
diyAudio Member
 
norman bates's Avatar
 
Join Date: Nov 2003
Location: iowa
I think so.

Bass horns (under 100hz) seem unpractical.
  Reply With Quote
Old 1st December 2012, 12:21 AM   #6
maxo is offline maxo  United States
diyAudio Member
 
Join Date: Sep 2012
Location: A Hole in Texas
so i better stick to a TH sub design like the SS15
  Reply With Quote
Old 1st December 2012, 02:32 AM   #7
diyAudio Member
 
norman bates's Avatar
 
Join Date: Nov 2003
Location: iowa
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).
  Reply With Quote
Old 3rd December 2012, 03:14 PM   #8
epa is offline epa  Netherlands
diyAudio Member
 
Join Date: Apr 2010
Location: amsterdam
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
__________________
one good thing about music ,when it hit you feel no pain.
so hit me with music
. hr driver db
  Reply With Quote
Old 3rd December 2012, 03:48 PM   #9
sippy is offline sippy  United Kingdom
diyAudio Member
 
Join Date: Jun 2008
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!!!!
  Reply With Quote
Old 3rd December 2012, 04:03 PM   #10
maxo is offline maxo  United States
diyAudio Member
 
Join Date: Sep 2012
Location: A Hole in Texas
Quote:
Originally Posted by norman bates View Post
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
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Tractrix in 1*Pi and 2*Pi revintage Multi-Way 21 26th August 2011 10:37 PM
proper design of pi-filter for Aleph 30 h_a Pass Labs 14 3rd February 2007 10:42 AM
PI Speakers Haknhendrix Multi-Way 1 13th November 2003 07:52 PM
What is 2 pi and 4 pi EternaLightWith Multi-Way 12 13th October 2003 02:28 AM


New To Site? Need Help?

All times are GMT. The time now is 07:10 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2