Evaluating Sub-woofer drivers - 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 30th April 2004, 08:02 PM   #1
RyanC is offline RyanC  United States
diyAudio Member
 
Join Date: Apr 2004
Location: Denver CO
Default Evaluating Sub-woofer drivers

Hello,

I am in the process of designing a 3 way active system- I have the upper components chosen-

Fountek JP2-

Audax 8" aerogel-

What I wan't for the low end is a high excursion sub woofer driver. These will be in the same box- not a seperate sub box and will be in a sealed box about 60L.

I have been looking at

The Stryke AV12

The TC sounds TC2+

Sonicraft SC12NRT

Ultimatly I would like to take these drivers up to about 150hz so that I can get a higher max spl out of the system (so the audax's won't be streesed to much trying to produce the low stuff).

So my question is how can I evaluate how high I can take any one of these woofers?

When I look at the freq plots they all should go up that high- But madisound suggested 80hz or so for the Sc12nrt- I suppose I can work with that but I would like to have the greatest amount of overlap so that I can expieriment with the best combination of max SPL and accuracy later (using the behringer DCX or similer). I think that madisound suggests 80hz because the driver starts to exibit much more distortion around 100-120hz- But I can't even find the info for distortion vs freq on the other woofers.

What I don't want to do is to go with the one that rep from the company says will work, just becaue they are trying to sell me somthing.

Is there a specific parameter that I should be looking at? Voice coil size? Qes? Qts? etc thanks for any input here,

Ryan
  Reply With Quote
Old 30th April 2004, 09:46 PM   #2
diyAudio Member
 
Join Date: Nov 2003
Location: flyover country
The Stryke AV12

The TC sounds TC2+

Sonicraft SC12NRT

Hi, Ryanc -

I was going to recommend (strictly from the sales literature) the Sonicraft because of its underhung large vc design which would seem to promise better control of the cone, but I noticed it has a foam surround which is a longevity concern, at least for me. Aside from that, TC sounds looks like they're putting effort into making the upper bass of their drivers decent. I wonder if there may be possible mismatches in sound by xovering from a heavy aluminum cone driver to a aerogel one above 100hz also. Plus, I still recall a review of the Carver Sunfire SW which called its sound 'rubbery' and not particularly dynamic higher in its frequency range. I've thought they must have been referring to the sonic contribution of its large half roll surround.

For my HT system, I bought 16 Audiobahn 12" aluminum cone Santoprene surround woofs when they were being closed out last year because they looked relatively decent & were marked way down(I still haven't got around to building the two endtable style cabinets for them, though) I'm going to cross them over quite low, around 50 - 70 hz.
  Reply With Quote
Old 30th April 2004, 10:38 PM   #3
ScottG is offline ScottG  United States
diyAudio Member
 
Join Date: Feb 2003
Location: US
I'd take a different tack here, a T-line with this driver:

This driver:
http://profesional.beyma.com/ENGLISH/producto.php

oops, thats the 12lx60 from the low freq. (lx60) drop down menue..

sold here:
http://mcm.newark.com/NewarkWebComme...jsp?id=55-2445


Its not cheap(price), but then again its not cheap(quality)! Notice the distortion vs. freq. on the pdf - you won't find typical drivers displaying this sort of low harmonic distortion. Additionally you can extend this driver higher in freq. if you wish. If you really need that small an enclosure you could always go with an ELF system with this driver (but you couldn't extend the freq. response much past 80Hz) - if you were to do it though I'd think 2 drivers would be recommended.
__________________
perspective is everything
  Reply With Quote
Old 1st May 2004, 07:39 AM   #4
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally posted by ScottG
a T-line with beyma12lx60
I had to go to my 3rd string browser for the page to work...but i finally snagged th epdf -- the Qt is a little low for a good TL.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 2nd May 2004, 11:37 PM   #5
diyAudio Member
 
Join Date: Apr 2004
Location: Brisbane
Send a message via Yahoo to ozynigma
Ryan,

You have not described the lower frequency response you are looking for from these speakers.

Do you want them to produce subwoofer type frequencies to say 20Hz?

I have just used an Adire DPL12 in a 60 litre enclosure with good results as a sub below 40Hz. My main speakers have a tweeter and 2 x 6" drivers and handle all the way down to 40Hz.

Without knowing the specs of your 8" driver I would assume it is comfortable going that low. I would be more concerned with its crossover with the tweeter with no midrange driver.

You are describing to me a tweeter, woofer, woofer(sub) speaker. Maybe some of the experts here could comment on whether the 8" and 12" would both need to be considered in the enclosure size calculations?

Howard
  Reply With Quote
Old 4th May 2004, 02:00 AM   #6
RyanC is offline RyanC  United States
diyAudio Member
 
Join Date: Apr 2004
Location: Denver CO
Cool,

T-Lines are too big for me and a little beyond my carpentry skill (and patience) level.

I think the TC is the one that I am leaning toward- How bad is a foam surround longevety wise? That is a concern for me.

Anyway i am looking for sub type performance but not necessarily all the way to 20hz- I would be prefectly happy with an f3 of 30-50hz. But I do want a high excursion driver- I want that big puchy sound that they tend to have (unless you have 10 lower xmax drivers). The Audax will go well below 150 or 100 or 60 even I just want somthing that remains very smooth up high so that I can cross it over slowly (on a soft slope) so that there should not be any major issue going from the Alu to the aerogel. Also I want the mid driver (the audax) to not have to deal with the really low stuff so that I can get more max spl out of it. Thanks again,

Ryan
  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
Evaluating Unknown Power Transformers wrenchone Tubes / Valves 18 18th July 2012 03:07 PM
Evaluating A Used Technics SL-1700 beffie Analogue Source 2 4th May 2005 08:04 PM
Evaluating amps, a fair comparison blind testing. destroyer X Solid State 11 21st March 2005 01:04 AM
Should Woofer material match drivers BROKEN THIRDS Introductions 2 19th April 2004 02:54 PM
Need help evaluating 2A3 transformer coupled designs Eric Tubes / Valves 27 17th October 2003 04:39 PM


New To Site? Need Help?

All times are GMT. The time now is 08:52 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