Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 11th January 2007, 03:33 PM   #1
diyAudio Member
 
Join Date: Jun 2006
Default simple questions, can't find the answers

I just finished building two towers using the pioneer subs TS-W125DVC, the specs are here somewhere on the site, I used 2.7 cubic feet boxes ported and tuned to 37hz, everything is fine at low volumes, but as soon as I throw some power at them they distort, they move a lot of air and they just sound weird, weirdly enough I did not have this issue when I was using them in my car in a 1.65 cubic feet box ported at 37hz they played hard and never distorted...Could it be that these speaker only handle small enclosures ?

Thanks...if you have any suggestions please donít' hesitate,

I don't mind changing the ports, but the size of the box has to stay the same...
  Reply With Quote
Old 11th January 2007, 03:40 PM   #2
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: British Columbia
Try adding stuffing to the port, a little at a time and see if that helps. Use polyester not fiberglass.
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 11th January 2007, 04:00 PM   #3
diyAudio Member
 
Join Date: Apr 2001
Location: Leeds, UK
Do you have a link to the woofer or any specifications?

We could model some enclosures for you
  Reply With Quote
Old 11th January 2007, 04:10 PM   #4
diyAudio Member
 
Join Date: Jun 2006
Stuffing ? in the port ? huh ?

Here's the specs...

TS-W125DVC

T/S PARAMETERS

Dia. 12 in.
Z 8.0 / 2.0 ohm
Re 6.0 / 1.5 ohm
Zmax TBD
fs 33.9 Hz
Qms 14.20
Qes 0.379
Qts 0.370
Vas 1.794 ft3
50.796 Liters
Sd 0.0460 m2
0.495 ft2
BL 21.247 / 10.667 Tm
Cms 1.695x10-4 m/N
Mms 129.73 g
Rms 1.953 Ns/m
Mg. Wt 2,350 g
83 oz
VC dia. 2.25 in.
56 mm
Hvc 1.13 in.
28.8 mm
Hag 0.39 in.
10 mm
Xmax 0.37 in.
9.4 mm
Levc 3.337 / 0.834 mH
Displ. 0.083 ft3
2.36 Liters
SPL 89 dB/W
Power (nom) 400 Watts
Power (max) 800 Watts
  Reply With Quote
Old 11th January 2007, 05:22 PM   #5
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: British Columbia
Quote:
Originally posted by pjaneiro
Stuffing ? in the port ?
Yes it's known as aperiodic loading.

http://www.diyaudio.com/forums/showt...852#post198852
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 11th January 2007, 07:24 PM   #6
diyAudio Member
 
Join Date: Jun 2006
i've been reading the site, and i'm not sure if that would solve my issues, i'm pushing the subs with just about 300w of power..., the power plant is a crown macrotech 2400, the subs are in a 3 way box, the enclosure is 2.7cubic feet with a 4 inch port 6.6 inch long, i just tried one of the boxes with another driver, it's a no name brand stamped HQ in the back 160wrms, they play loud punch hard and do not distort, but of course the bass is no where near the ones punched by the pioneer, anyone here had experience with these drivers ? or anyone here knows of a good driver that would be suitable for a 2.7 ft box that is capable or deliverng bass and power ? i know i'm asking a lot with little info, but i just finnished building these boxes and i don't want to end up building others...
  Reply With Quote
Old 11th January 2007, 07:32 PM   #7
adason is offline adason  United States
diyAudio Member
 
adason's Avatar
 
Join Date: Nov 2004
Location: Maryland
hi pjaneiro,

try to close the port completely and see if the bass gets better
maybe the box is too big or port tuned at wrong fr
eliminate port and see
maybe reduce the volume, that for sure will limit the lower fr response, but you might get well controlled bass
  Reply With Quote
Old 11th January 2007, 09:41 PM   #8
diyAudio Member
 
Join Date: Apr 2001
Location: Leeds, UK
Thanks for the driver specs, it looks like you're waaaay oversized on the enclosures, you actually weren't too far off with your origonal 1.65 cu ft boxes.

I get about 1.4 cu ft ideal volume tuned to 36Hz, with that and no sub-sonic filtering you will be able to give them 400w right down to 30Hz or so before you get beyond linear excursion. Add a 30Hz 2nd order highpass filter and you'll be able to give it as much stick as you like with your amp
Sealed isn't really an option with that driver as you need around 0.7 cu ft and you end up with an f3 around 65hz, and it doesn't have the nessasary excursion capability for much of a linkwitz transform.
  Reply With Quote
Old 12th January 2007, 04:22 AM   #9
diyAudio Member
 
Join Date: Jun 2006
I though it had to do with teh size of the box, i put back the subs in their original boxes and they kick ***, i'm already running a subsonic filter 4th order 24db at 25hz, so i guess it's time for me to get new driver to fit in these boxes.......
  Reply With Quote
Old 12th January 2007, 06:17 PM   #10
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: British Columbia
Can you lower the volume of the box by adding wood or bricks or W.H.Y. to the inside?
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  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
Utter novice looking for answers to easy questions: shnaggletooth Tubes / Valves 24 23rd August 2009 09:10 AM
just another rookie,looking for simple answers. yosh Multi-Way 44 4th August 2004 02:35 AM


New To Site? Need Help?

All times are GMT. The time now is 05:13 AM.


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