PPI Pro124 subs and questions - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

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 22nd August 2004, 08:02 PM   #1
diyAudio Member
 
Join Date: Jan 2004
Location: az
Default PPI Pro124 subs and questions

hey everyone
Ok, i have a pair of PPI pro 124 12" subs, they are of the flat piston type and handle 300W RMS i think. I have a choice of running the 2 with an alphasonik PMA-2100i (100WRMS@4ohmsx2) or a pioneer GM-X862(125WRMS@4ohmsx2).
Which amp would be a better choice (or should i get an entirely different amp) for these subs, and also does anyone know where to get the thiele small parameters for these drivers or have any box specs, or at least the resonant frequency so i can add a port?

1 more thing, has anyone ever heard or dealt with these subs? are they cool?do they sound good? gimme some ideas!!!
__________________
sean
  Reply With Quote
Old 23rd August 2004, 12:21 AM   #2
diyAudio Member
 
theAnonymous1's Avatar
 
Join Date: Feb 2004
Location: Anonymityville
Heres the T/S parameters for the PPI pro 124......

Fs = 43 Hz
Qms = 2.51
Vas = 1.553 cu.ft
Cms = 0.0207 in/lb
Mms = 4.046 oz
Rms = 27.53 lb/s
Xmax = 0.217 in
Xmech = 0.512 in
P-Dia = 10.05 in
Sd = 79.36 sq.in
P-Vd = 0.00994 cu.ft
Qes = 0.66
Re = 4 ohms
Z = 4 ohms
BL = 3.089 lb/A
Pe = 300 watts
Qts = 0.52
no = 0.524 %
1-W SPL = 89.31 dB
2.83-V SPL = 92.39 dB

The pro 124 has a pretty high Fs for a 12" sub. I did some box modeling and a 3cu.ft box tuned at 32hz looks ok with a 3db down point of just above 30hz. If you used a single 4" port it would need to be 7" long(a bigger port would be a little better, but it would be much longer). At 300 watts it would yield a vent air velocity of 7.9%. That design is for one side so you would have to double it for both subs.

As far as your choice of amps go, I would look into something with a little more power. Neither of those amps will run those subs to their full potential.
  Reply With Quote
Old 23rd August 2004, 12:25 AM   #3
diyAudio Member
 
SmarmyDog's Avatar
 
Join Date: Jul 2003
Location: San Diego, CA
Default Toasty

I have a couple PPI Pro 104's in my big ol' pile of fried woofers. Here are some pics...


Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

They have very short voice coil lengths and since they are an overhung design they have a very small Xmax. They sounded quite decent at low volume levels but were not SPL demons when cranked. I had a fairly whimpy 300W Autotek class-D amp driving them and the amp was never driven into clipping (I adjust maximum gain with an oscilloscope).

If you're after good sound quality, your two 12's will perform well with either of the amps you listed. If you are going for sheer decibels then you might want to consider a more traditional (less compact) driver.

-Casey Walsh
  Reply With Quote
Old 23rd August 2004, 01:05 AM   #4
diyAudio Member
 
theAnonymous1's Avatar
 
Join Date: Feb 2004
Location: Anonymityville
That voice coil looks like it received some square waves of death
  Reply With Quote
Old 23rd August 2004, 04:12 AM   #5
diyAudio Member
 
Join Date: Jan 2004
Location: az
thanks a lot for the help and info, and what the hell did u do to those subs!?! good job
__________________
sean
  Reply With Quote
Old 23rd August 2004, 04:46 AM   #6
diyAudio Member
 
theAnonymous1's Avatar
 
Join Date: Feb 2004
Location: Anonymityville
Just a suggestion...... You could get rid of one of those amps and acquire another one that matches the one you decide to keep. Then you can bridge both amps to 4ohm mono and put one sub on each. That should leave you enough headroom to not clip and fry the subs like the pics above.


Good Luck
  Reply With Quote
Old 15th June 2005, 10:43 PM   #7
K-amps is offline K-amps  United States
diyAudio Member
 
K-amps's Avatar
 
Join Date: Nov 2003
Location: Indiana
Default Re: Toasty

Quote:
Originally posted by SmarmyDog
I have a couple PPI Pro 104's in my big ol' pile of fried woofers. Here are some pics...



They have very short voice coil lengths and since they are an overhung design they have a very small Xmax. They sounded quite decent at low volume levels but were not SPL demons when cranked. I had a fairly whimpy 300W Autotek class-D amp driving them and the amp was never driven into clipping (I adjust maximum gain with an oscilloscope).

If you're after good sound quality, your two 12's will perform well with either of the amps you listed. If you are going for sheer decibels then you might want to consider a more traditional (less compact) driver.

-Casey Walsh
Casey,

That Pro10 is not one of the ones Alma agates used is it?


  Reply With Quote
Old 16th June 2005, 12:53 AM   #8
diyAudio Member
 
SmarmyDog's Avatar
 
Join Date: Jul 2003
Location: San Diego, CA
Well now I HAVE to ask who/what is Alma agates...
  Reply With Quote
Old 16th June 2005, 01:54 AM   #9
K-amps is offline K-amps  United States
diyAudio Member
 
K-amps's Avatar
 
Join Date: Nov 2003
Location: Indiana
She set the db record on her Ford Bronco using the Pro10's in 1997/8. A google search will yield more info.
  Reply With Quote
Old 29th June 2005, 10:03 PM   #10
diyAudio Member
 
Join Date: Jun 2005
Location: california
Send a message via AIM to lynchingacers Send a message via Yahoo to lynchingacers
Default Re: Toasty

Quote:
Originally posted by SmarmyDog
I have a couple PPI Pro 104's in my big ol' pile of fried woofers. Here are some pics...


Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

They have very short voice coil lengths and since they are an overhung design they have a very small Xmax. They sounded quite decent at low volume levels but were not SPL demons when cranked. I had a fairly whimpy 300W Autotek class-D amp driving them and the amp was never driven into clipping (I adjust maximum gain with an oscilloscope).

If you're after good sound quality, your two 12's will perform well with either of the amps you listed. If you are going for sheer decibels then you might want to consider a more traditional (less compact) driver.

-Casey Walsh


ever heard of moderation my god u had to notice the sound if u wrecked them that bad but i bet it was fun!!!!
  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
Small sealed Shiva subs - Linkwitz questions scottrichardson Subwoofers 4 17th August 2008 11:34 PM
Some Quad els57 questions! - Novice Questions! Fanuc Planars & Exotics 13 5th December 2007 10:26 AM
Convert floor standers to subs with Tang Band 8" subs? prerunnerv6 Subwoofers 3 26th February 2006 01:44 AM
2 subs one box/2 subs 2 boxes vetkilr Subwoofers 5 22nd February 2006 10:27 PM
Questions on push-push subs... Schaef Subwoofers 39 20th November 2004 03:46 AM


New To Site? Need Help?

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