Newbie design - diyAudio
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 1st April 2004, 11:26 AM   #1
mikec is offline mikec  Australia
diyAudio Member
 
Join Date: Apr 2004
Location: Albany
Default Newbie design

Hi.

I am new to speaker building so I want my first project to be mainly a learning exercise.
Therefore I have decided to try and make a Subwoofer out of parts I already have.
A friend recently gave me a set of speakers with 12 inch Dai1chi 120 watt speakers, plus I have a couple of reasonable quality 300 watt stereo amplifiers, so hopefully I can make something that doesnt sound to bad.
I would like some advice on what would be the best way to go:

Sealed or vented sub?
Dual 12inch drivers in one sub or two small subs?

Any existing plans that you know of that may be suitable would be greatly appreciated.

Thanks

Mike C
  Reply With Quote
Old 1st April 2004, 07:49 PM   #2
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Without the driver parameters we cannot help,

sreten.
  Reply With Quote
Old 2nd April 2004, 09:23 AM   #3
mikec is offline mikec  Australia
diyAudio Member
 
Join Date: Apr 2004
Location: Albany
After much searching, found the following info on the drivers
(Made a mistake in my last post-100W not 120W)

12" WOOFER 100W
Paper Cone.
Foam Surround.
Z 8W (7.2Wdc)
Freq. 334KHz
Fo 32Hz
Sens' 93dB
Magnet 30 Oz
Voice 38mm
Power 100W nom.
Qms 1.42
Qes 0.47
Qts 0.35
Vas 188.56L
Code SP12-100

Thanks
  Reply With Quote
Old 2nd April 2004, 09:33 AM   #4
mikec is offline mikec  Australia
diyAudio Member
 
Join Date: Apr 2004
Location: Albany
After much searching, found the following info on the drivers
(Made a mistake in my last post-100W not 120W)

12" WOOFER 100W
Paper Cone.
Foam Surround.
Z 8W (7.2Wdc)
Freq. 334KHz
Fo 32Hz
Sens' 93dB
Magnet 30 Oz
Voice 38mm
Power 100W nom.
Qms 1.42
Qes 0.47
Qts 0.35
Vas 188.56L
Code SP12-100

Thanks
  Reply With Quote
Old 2nd April 2004, 02:51 PM   #5
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
some alignments for one driver, sreten.
Attached Images
File Type: gif dai1chi.gif (60.5 KB, 240 views)
  Reply With Quote
Old 2nd April 2004, 02:58 PM   #6
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Xmax is not given but here are some isobaric pair alignments,

sreten.
Attached Images
File Type: gif dai1chi.gif (66.6 KB, 223 views)
  Reply With Quote
Old 2nd April 2004, 03:05 PM   #7
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
JMO but a single 300w amplifier is way more than enough,
IMO you'd be a lot better off with the facilities provided
by a mono plate amplifier circa 150w for both drivers, e.g. :

http://www1.jaycar.com.au/productVie...=&SUBCATID=443

Note that an isobaric pair will be 1/4 of the size of a pair
used in parallel, but maximum output will be 6dB lower.

IMO the isobaric ~ 2 cuft ~ 60L tuned 30Hz looks good,
unless a big box is not a problem, then ~ 6cuft ~ 200L
tuned to 28Hz, drivers in parallel is the way to go.

sreten.
  Reply With Quote
Old 5th April 2004, 03:03 AM   #8
mikec is offline mikec  Australia
diyAudio Member
 
Join Date: Apr 2004
Location: Albany
Thanks steren for the info, much appreciated.
A couple more questions:

With the isobaric option, does the box volume stay the same if you dont have the drivers configured in a clamshell arrangement, instead have one behind the other (cant remember what they call this config)?

Also I was trying to match your results by putting the driver info into WinIsp but my results never seemed to match yours- mainly in the single driver option- box always came out at 118 ltrs- This is the first time I have used this program so I guess I am doing something wrong or misinterpreting the driver data.
Can you show me the data you entered into the driver parameters?

Thanks again.
  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
1U5 amplifier design, Newbie Speaker Dude Tubes / Valves 3 3rd May 2009 04:32 PM
Amp design Newbie help anyone? matt09 Chip Amps 11 7th August 2006 11:27 PM
TL design questions from a newbie. Spasticteapot Full Range 3 19th March 2006 03:12 AM
Senior Design Newbie Deltat Introductions 8 1st May 2005 01:56 AM
Newbie Design seekingwisdom Multi-Way 4 27th April 2005 03:44 AM


New To Site? Need Help?

All times are GMT. The time now is 10:19 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