polk plate amp and 8 Klipsch drivers....what to do??? - 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 15th May 2010, 02:51 AM   #1
diyAudio Member
 
jmillerdoc's Avatar
 
Join Date: Mar 2009
Location: Lawton, OK, USA
Default polk plate amp and 8 Klipsch drivers....what to do???

Hello,
I have acquired many interesting drivers and electronics over the years which have been gathering dust too long. I wanted to put together a subwoofer with some parts I have on hand. I was hoping for some ideas and assistance here.

I have to work with 2 Polk plate amps (200w each) from a pair of RT2000p speakers and 8 (eight) Klipsch 8" sub drivers.

The specs for the subs I have are from ApexJr:

Vas 29.46 L, Fs 45.7406, Qts 0.4644, Qes 0.5429, Qms 3.2134, Re 2.99, Le 0.5439mH, 89.98 dB 1w/1m, BL 6.23 Tesla Meters

I wanted a single enclosure using as many of the subs I can with the smallest footprint possible. I am flexible (very).

Thanks for your thoughts and advice!
Jeff
  Reply With Quote
Old 15th May 2010, 09:23 AM   #2
diyAudio Member
 
Join Date: Apr 2010
the fs is a little high and the Qts is slightly high for ported but should manage if tuned low enough.

i would get winisd or similar and take a look for yourself. Even use winisd online punch in fs qts etc and get an idea.
8 woofers means +9dB sensitivity due to cone area. I prefer smaller multiples thant huge monoliths.
Do you know the Xmax(excursion) ?
  Reply With Quote
Old 15th May 2010, 10:01 AM   #3
diyAudio Member
 
jmillerdoc's Avatar
 
Join Date: Mar 2009
Location: Lawton, OK, USA
Default Woofer Tester measurements

Quote:
Originally Posted by neddludd View Post
the fs is a little high and the Qts is slightly high for ported but should manage if tuned low enough.

i would get winisd or similar and take a look for yourself. Even use winisd online punch in fs qts etc and get an idea.
8 woofers means +9dB sensitivity due to cone area. I prefer smaller multiples thant huge monoliths.
Do you know the Xmax(excursion) ?
I don't have the Xmax but I do have the Woofer Tester measurements I forgot about earlier when I posted the first time (from ApexJr website). These were don on the drivers in hand by the individual I purchased them from. I have included them here attached .pdf

Where can I find winisd online?
Jeff
Attached Files
File Type: pdf 20090309140036.pdf (34.1 KB, 13 views)
  Reply With Quote
Old 15th May 2010, 11:01 AM   #4
diyAudio Member
 
picowallspeaker's Avatar
 
Join Date: Apr 2007
Hi ! I wish I had 8 drivers to play with ! Are those real subs or just woofers ? I'm asking because lot of people call "sub" anything bigger than 2". The problem is IMHO their low Z and the fact that they should be matched to be sure they work at best in the same enclosure . Serial-parallel connection (betterarallel then serial ) would give about 4 Ohm.I'm talking about two boxes for stereo application.
Putting them in a big box with two big vents (B3 alignment) would work ,I guess.
But my idea was to put them in a faceted solid structure (like a pyramid with triangular base ) which is part of a big horn , working till 3-400 Hz . Well ,that's a 2 or 3 way design ,not a sub...
  Reply With Quote
Old 15th May 2010, 03:03 PM   #5
bjorno is offline bjorno  Sweden
diyAudio Member
 
Join Date: Mar 2005
Location: Jacobsmountain
Send a message via MSN to bjorno
Quote:
Originally Posted by jmillerdoc View Post
I was hoping for some ideas and assistance here.
Hi Jeff,

IMO, The drivers are most suitable for closed box designs where each needs at least a cu.ft. of internal volume resulting in a minimum 8 cu.ft./ 8 Ohm speaker not utilizing the full potential of your two plate amps and the speaker footprint wouldnt be small.

For smoothest in room FR response you need at least 3 boxes, preferably at least one main sub near a corner and two or more placed elsewhere. For main sub use and low extension I recommend building T-TQWPs to be placed near corners using 2 drivers in series in two boxes with a footprint about 1.25 sq. ft.

b
Attached Images
File Type: gif Jeff_T-TQWP.GIF (106.4 KB, 91 views)
  Reply With Quote
Old 15th May 2010, 03:58 PM   #6
diyAudio Member
 
jmillerdoc's Avatar
 
Join Date: Mar 2009
Location: Lawton, OK, USA
Ya know....these are woofers, not subs. I still have the original 8" Polk drivers the plate amps were ment to drive. I still have the original ports too. I could build 2 seperate subs with these, just need to figure the original volume of the cabs and make some boxes up.

This still leaves me with the 8 Klipsch drivers.......maybe for some WWWWMT 3 ways. I have some tweeters that would keep up with the SPL of 4 of the woofers, just need to find a cheap high eff mid and a good xover design.

Jeff
  Reply With Quote
Old 16th May 2010, 02:26 AM   #7
diyAudio Member
 
Join Date: Apr 2010
Get winisd pro and enter in the data, have a look. I dont think anyones going to do it all for you

The larger your main speakers, the more likely your panel modes will be resonating IN BAND which you dont want. Id make the speakers producing the 300hz-3khz in particular as small as possible, or make alot of effort to control modes. After hearing some silver iris 15" coaxials on small open baffles my ears havent been as happy since/
  Reply With Quote
Old 16th May 2010, 10:42 PM   #8
diyAudio Member
 
Join Date: Jan 2008
Location: Toronto and Delray Beach, FL
Pity, 8 is the wrong number.

You want 16 (or maybe 9), half facing forward, series-parallel, in a big sealed box with motional feedback.

Does the resonance of the unit or the system change when there are a whole bunch? I can't remember.
__________________
Dennesen ESL tweets, Dayton-Wright ESL (110-3200Hz), mixed-bass Klipschorn + giant OB using 1960's Stephens woofer; Behringer DSP
HiFi aspirations since 1956
  Reply With Quote
Old 17th May 2010, 12:10 AM   #9
diyAudio Member
 
Join Date: Apr 2010
Quote:
Originally Posted by bentoronto View Post
Pity, 8 is the wrong number.

You want 16 (or maybe 9), half facing forward, series-parallel, in a big sealed box with motional feedback.

Does the resonance of the unit or the system change when there are a whole bunch? I can't remember.
No the Fs doesnt change. You could use motional feedback yes,it looks like youd have to DIY it though. If you listen at sane volumes they wont be quite as nonlinear as running 2 x 8"s at their limit anyway.
  Reply With Quote
Old 18th May 2010, 07:26 AM   #10
dangus is offline dangus  Canada
diyAudio Member
 
Join Date: May 2004
Location: Vancouver Island
I'm just going to throw out the idea of a low profile sub that could sit on edge behind a couch, or lie on the floor, maybe with a second row of seating on top. Or, maybe tapped horns with 2 drivers per horn.
  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
polk, celestion, vifa raw speaker drivers ke4mcl Swap Meet 5 7th January 2010 04:22 AM
Just acquired a pantload of replacement drivers for Energy, Polk, Klipsch The Paulinator Swap Meet 7 2nd October 2009 05:46 PM
Polk Audio MW8000 drivers pair Rockmore Swap Meet 2 24th September 2009 04:48 PM
Tons of replacement Energy and Polk drivers for sale The Paulinator Swap Meet 15 15th May 2006 03:29 PM
FS: (AU) Sub plate amp, Vifa, SS, NHT drivers fishball79 Swap Meet 0 10th December 2004 06:53 AM


New To Site? Need Help?

All times are GMT. The time now is 11:05 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