Go Back   Home > Forums > >

Multi-Way Conventional loudspeakers with crossovers

Dipole Woofer for upper bass Recommendation
Dipole Woofer for upper bass Recommendation
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
Old 10th June 2007, 11:31 PM   #1
Hara is offline Hara  United States
diyAudio Member
 
Hara's Avatar
 
Join Date: Oct 2005
Default Dipole Woofer for upper bass Recommendation

Hello,

I am going over revisions for my final dipole speaker design and I am lacking good choices for a good woofer with the following criteria.

Low as possible distortion
Used Bandwidth: (80-100, preferably low) - 250hz not including bandwidth for crossover slopes

Linear output within used SPL
SPL range: up to 105 db
This tends to require drivers (using SL's dipole_spl excel sheets) with a bare minimum of 190 cm^2 surface area (or about 8" diameter) with 5mm of xmax. High xmax helps but consider the tradeoff of low distortion vs xmax. (http://www.zaphaudio.com/lowxmax.html)

Driver size should be less than 15", preferably less.

Sensitivity: Greater than 87db/watt*m

Preferably Qts between .5 and .7 for simplified filter design

Finally,
Price: $30-$80 per driver

Driver's Currently considered:
Peerless SLS 12" and 10" ~$60
Dayton RS270 10" ~$30

Any suggestions or data on such drivers would be greatly appreciated.
  Reply With Quote
Old 10th June 2007, 11:34 PM   #2
bigwill is offline bigwill  United Kingdom
diyAudio Member
 
Join Date: Dec 2004
Location: UK
I know it's 15" but consider the Eminence Beta 15

Qts of around 0.6 iirc, senstivity around 98dB

xmax of 4mm, but it's 15"

Fs of 35Hz so It should easily cover the range you want

Quite a linear response in the range you want too
  Reply With Quote
Old 10th June 2007, 11:43 PM   #3
Hara is offline Hara  United States
diyAudio Member
 
Hara's Avatar
 
Join Date: Oct 2005
Thank you for your response.

Do you have any data on its harmonic distortion or links to people who have tested them?
  Reply With Quote
Old 10th June 2007, 11:53 PM   #4
bigwill is offline bigwill  United Kingdom
diyAudio Member
 
Join Date: Dec 2004
Location: UK
Quote:
Originally posted by Hara
Thank you for your response.

Do you have any data on its harmonic distortion or links to people who have tested them?

Not offhand, but considering it's a high efficiency PA driver designed to be hammered with hundreds of watts, I think at home listening levels it would be quite low. This is just a guess though.
  Reply With Quote
Old 11th June 2007, 06:05 PM   #5
ScottG is offline ScottG  United States
diyAudio Member
 
Join Date: Feb 2003
Location: US
If I were you I wouldn't get "hung up" on low non-linear distortion, though sometimes audible with test tones - I personally find even fairly high non-linear distortion to be in-audible for music (order vs. spl dependent).

I use two of these per side parallel connected (i.e. 8 ohms nominal):

http://www.shredmuzic.com/product_p/813-010.htm

I have no idea what the distortion spectrum/level is like with them.. however:

1. They sound good in this application,
2. They are limited in fs - allowing for lower nominal distortion when considering excursion,
3. 2 drivers are better than one (..again, lower nominal distortion),
4. They have more mass - which provides a bit more "punch" in this region (..though marginally at the expense of "delicacy" depending on the pairing amplifier),

Caution: The drivers have 3 inch VC's - this may allow for less distortion near fs (and they are also vented), but conversely more distortion at higher freq.s (>1 kHz).

Additionally, IF you purchase them - make sure to "test" the drivers with various music to make sure you don't get a driver with poor gluing at the surround that makes a buzzing sound (..one of my 4 drivers did this prior to modification to fix it - of course you can always return the driver for a new one).
__________________
perspective is everything
  Reply With Quote
Old 11th June 2007, 08:39 PM   #6
Hara is offline Hara  United States
diyAudio Member
 
Hara's Avatar
 
Join Date: Oct 2005
I'm concerned for low harmonic distortion measurements simply because the other drivers used in my design are also quite low. Vifa XG18, and Seas H1212. So for the sake of matching well together I thought it would be a good idea to also have low distortion woofers. Also for comparison reasons, having more numbers helps.

They are relatively cheap drivers so going two per cabinet allows me to go even lower down to 50-60hz which is a nice benefit, but not a requirement.

I checked madison's website, they do not provide complete datasheets on their drivers. While I'll be adding filters, it would be nice to know what kind of filters they would need. (From the given parameters, I just ran it through winISD in a large box to see its response, and it does look good for this application.)

I will of course be testing the purchased drivers (whichever I choose) for final consideration.

Anyways, thank you for your suggestion ScottG, it looks like a good candidate and will be considered.

I have basically till the end of next week to decide, just so I can start working on it.

Also, is there any woofer testing site that compare many woofers around this range? I know there are a few for the subwoofer range, midrange, and tweeters, but not woofers. If not, maybe I should start one? Just a thought. At least, whatever I build, I'll post my results.
  Reply to this post

Reply


Dipole Woofer for upper bass RecommendationHide this!Advertise here!
Thread Tools

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
Dipole Ribbon tweeter isolation from dipole mid-woofer array Bent Planars & Exotics 8 29th March 2015 09:45 AM
12 " for lower midrange - upper bass Audiodidakt Multi-Way 33 23rd June 2009 05:39 PM
Dipole bass with Seas L26 alu woofer? cyclo Subwoofers 16 4th September 2004 03:05 PM
a couple of questions re: woofer roll of (upper ) and mc-2 info Nanook Multi-Way 13 17th March 2004 07:41 AM
Need to smooth upper bass of sub response... eRiCdWoNg Subwoofers 4 27th August 2003 04:01 AM


New To Site? Need Help?

All times are GMT. The time now is 07:14 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki