Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Simple bass unit using the Dayton PA310
Simple bass unit using the Dayton PA310
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 3rd January 2018, 07:38 AM   #41
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
Simple bass unit using the Dayton PA310
regarding the audibility of bass distortion - is that with sine wave? - music? - if the latter, subjectively how does the distortion subjectively manifest itself? darker timbres? - wooly bass ? thud-i-ness?

would you still suggest tuning POC3 TH a bit higher?
  Reply With Quote
Old 3rd January 2018, 03:58 PM   #42
Brian Steele is offline Brian Steele  Grenada
diyAudio Member
 
Join Date: Nov 2007
Quote:
Originally Posted by freddi View Post
regarding the audibility of bass distortion - is that with sine wave? - music? - if the latter, subjectively how does the distortion subjectively manifest itself? darker timbres? - wooly bass ? thud-i-ness?

would you still suggest tuning POC3 TH a bit higher?
The audible distortion manifested itself at frequencies below Fb (~50Hz), and it was during a swept sine wave test at different SPL levels, which can be particularly hard on vented designs (or any design where the driver is unloaded below a certain frequency). I configured REW to start the sweeps off at 44 Hz and then changed it to 48 Hz for the sweeps at higher power. I still wasn't able to achieve 10% THD in the passband, but I got very close.

I was able to find some temporary stuffing material yesterday afternoon, so I'm going to perform another set of tests today on it, including the filtering suggestion I gave in a previous message.

Hey, I can even make a good recording of it (using the UMM mike) playing back a few tracks. Any suggestions?
__________________
www.diysubwoofers.org
  Reply With Quote
Old 3rd January 2018, 04:00 PM   #43
Brian Steele is offline Brian Steele  Grenada
diyAudio Member
 
Join Date: Nov 2007
Quote:
Originally Posted by freddi View Post
would you still suggest tuning POC3 TH a bit higher?
Yes, if planning to use just one. ~40 Hz tuning on a 12" driver with 5mm Xmax for pro audio use is really pushing it.
__________________
www.diysubwoofers.org
  Reply With Quote
Old 3rd January 2018, 07:26 PM   #44
Brian Steele is offline Brian Steele  Grenada
diyAudio Member
 
Join Date: Nov 2007
Quote:
Originally Posted by Brian Steele View Post
I was able to find some temporary stuffing material yesterday afternoon, so I'm going to perform another set of tests today on it, including the filtering suggestion I gave in a previous message.
The results of the filtering look pretty good - see attached. Basically I minimized the 20 Hz and 31 Hz setting, then increased the 50 Hz setting a bit to compensate and add a little extra at that frequency.

I also tried running it again at the maximum volume I was prepared to drive it. My multimeter suggests that 32.2V at 70 Hz and 37.7V at 50 Hz. It survived the playing of some test tracks with lots of low frequency bass (e.g. "Mi Gente") intact without sounding stressed. At peak levels it did lose that "effortless" sound of the POC3 TH alignment though, but that may be due to my "confirmation bias" at work again
Attached Images
File Type: png 20180103-POC6 with EQ.png (49.7 KB, 82 views)
__________________
www.diysubwoofers.org
  Reply With Quote
Old 3rd January 2018, 08:18 PM   #45
LORDSANSUI is offline LORDSANSUI  Brazil
diyAudio Member
 
Join Date: Sep 2016
good work as always
  Reply With Quote
Old 5th January 2018, 07:56 PM   #46
Fidstang is offline Fidstang  United States
diyAudio Member
 
Join Date: Nov 2014
Location: USA - Midwest
That'll be a good little outdoor bass bin with the processing you did. I think the thickness of the cone on these, also help with the perception of it going deeper than it really is. Be sure to let us know how you feel about it after a few good party sessions.
  Reply With Quote
Old 6th January 2018, 12:20 AM   #47
Brian Steele is offline Brian Steele  Grenada
diyAudio Member
 
Join Date: Nov 2007
Quote:
Originally Posted by Fidstang View Post
That'll be a good little outdoor bass bin with the processing you did. I think the thickness of the cone on these, also help with the perception of it going deeper than it really is. Be sure to let us know how you feel about it after a few good party sessions.
Interesting you'd mention that. Per the measurement below, the distortion is primarily 2nd order in nature (though at high levels the driver's terminals can be heard buzzing via the vent). We are not sensitive to distortion at bass frequencies, and we are certainly not sensitive to even order distortion at bass frequencies - it can actually make the bass sound "fuller". This might work in this design's favour.
Attached Images
File Type: png 20180105-POC6 with EQ (distortion).png (59.5 KB, 54 views)
__________________
www.diysubwoofers.org
  Reply With Quote
Old 26th January 2018, 03:09 AM   #48
Brian Steele is offline Brian Steele  Grenada
diyAudio Member
 
Join Date: Nov 2007
Just a minor update - I've finished the first paint job on the POC6 (which of course exposed all the flaws that need to be corrected). I built this as a sort of "reference", but it might actually end up getting some use outside, so I've got to find a way of protecting the MDF from the elements (the occasional beer spill, etc.). Paint and a good mesh grille for the driver should do the job.

The POC6 actually sounds pretty good, with a nice punchy sound with most music. It's about the third time (that I know about) that the MLTL workbook has been used to successfully design a subwoofer (though with a 48 Hz Fb, and a rolloff that starts a bit above 50 Hz, this is more truthfully a bass module than a subwoofer!).
Attached Images
File Type: jpg 20180125-POC6.jpg (365.6 KB, 34 views)
__________________
www.diysubwoofers.org
  Reply With Quote
Old 26th January 2018, 03:27 AM   #49
globalplayer is online now globalplayer  Germany
diyAudio Member
 
globalplayer's Avatar
 
Join Date: Oct 2014
Location: =)
Should work well with late 70s, early 80s disco funk or techno.
I like the blue.
__________________
◢◣◢◣◢◣◢◣◢◣
  Reply With Quote
Old 26th January 2018, 08:51 AM   #50
USRFobiwan is offline USRFobiwan
Horn Addict
diyAudio Member
 
USRFobiwan's Avatar
 
Join Date: Oct 2014
Location: Haarlem
Simple bass unit using the Dayton PA310
Can also be a part of a DJ monitor setup. What is the bandwidth? Did you do any measurements?
__________________
Destroyed some nostalgia
For the love of Horns and glory of pressure waves.
  Reply With Quote

Reply


Simple bass unit using the Dayton PA310Hide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
small bass unit johnr66 Subwoofers 10 3rd February 2014 11:04 PM
Finally taking the plunge (Dayton PA310-8 TH) Brian Steele Subwoofers 43 4th December 2012 01:17 AM
dayton wright st300a matching / bias trnsformer unit krmaudio Planars & Exotics 14 21st October 2010 01:05 AM
Help for bass unit incloser pra3718 Subwoofers 4 23rd January 2009 03:45 PM
Cracked bass unit nfcgfm Multi-Way 3 17th April 2008 04:29 PM


New To Site? Need Help?

All times are GMT. The time now is 03:56 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki