Which is the better woofer? - 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 23rd July 2001, 07:35 PM   #1
Ignite is offline Ignite  Canada
diyAudio Member
 
Join Date: Jul 2001
Location: Toronto, Ontario, Canada
Send a message via ICQ to Ignite
I am well aware the second woofer is much more efficient, but in every computer-based simulation of low-end frequency response, it has a much, much higher dropoff, creating pretty crappy < 40Hz response. And it's 6 ohm. So I ask, which is probably the better choice, and why?

Pioneer A25FU14-57F:
Outside Dia: 256mm
Impedance: 8 ohm
Power: 70W
Freq. Response: 28Hz - 2.5KHz
Magnet: 14Oz
Fs: 28Hz
Re: 7.4 ohm
Qts: 0.49
Qes: 0.55
Qms: 4.28
Vas: 121.2 L
Xmax: 3.4mm
Voice Coil Dia: 38 mm
SPL: 89dB
Depth 104mm
Baffle Opening: 236mm
Mtg. Cntr: 248 mm BC x 4

Pioneer A25FU30-51D:
Outside Dia: 256mm
Impedance: 6 ohm
Power: 85W
Freq. Response: 26Hz - 2.5KHz
Magnet: 30 Oz
Fs: 26Hz
Re: 5.5 ohm
Qts: 0.20
Qes: 0.21
Qms: 3.36
Vas: 171.9 L
Xmax: 2.9mm
Voice Coil Dia: 38 mm
SPL: 93dB
Depth 113mm
Baffle Opening: 236mm
Mtg. Cntr: 248 mm BC x 4
  Reply With Quote
Old 23rd July 2001, 09:37 PM   #2
diyAudio Member
 
Join Date: May 2001
Location: Netherlands
It depends on what kind if speaker you want to build bas- reflex or closed or maybe TWQ or ... Or what kind of amp want to you use and a lot of other things.

Remco
  Reply With Quote
Old 23rd July 2001, 10:03 PM   #3
Ignite is offline Ignite  Canada
diyAudio Member
 
Join Date: Jul 2001
Location: Toronto, Ontario, Canada
Send a message via ICQ to Ignite
Bass reflex, kenwood (VR-408) reciever, woofer will be included in a 5-speaker system each with a tweeter and one of those two woofers.
I'm looking for the one with better bass response in a reasonable sized vented cabinet (~100-150L).

[Edited by Ignite on 07-23-2001 at 05:10 PM]
  Reply With Quote
Old 24th July 2001, 05:00 AM   #4
diyAudio Member
 
Join Date: May 2001
I ran some numbers through WinISD, and got some answers for you. The A25FU30-51D driver is NOT for you. It's -3dB point, in an optimum configuration is 73Hz, but can be lowered to 46Hz, by using an EBS (Extended Base Shelf) configuration (for more information on EBS configurations, please see 'http://www.diysubwoofers.org/'). The response falls like a rock below that. If you're using a sub, this might work out, but you didn't say.

The A25FU14-57F should work for you in either a sealed or a vented configuration. The vented configuration (limited to 120L, to accomodate the port, and stay within your limits; it thinks it wants 300L) shows a -3dB point of 29Hz. The sealed configuration (Qtc=0.7) shows a -3dB point of 40.5Hz, but with slower rolloff than the vented.

The room acoustics must also be considered. Most rooms will give a 10-20dB boost by 20Hz (smaller rooms give higher boost). With a vented enclosure, this would probably end up sounding boomy.

I'd go with the A25FU14-57F in a sealed enclosure, between 120 and 150L. This should give fair results. Please note, you will not be able to get loud, low bass out of this driver (at least not and have it continue working ).

FYI, sealed enclosures are the simplest to build, and the most forgiving of minor math errors (size).

Good luck.
  Reply With Quote
Old 24th July 2001, 07:23 PM   #5
diyAudio Member
 
Join Date: May 2001
Location: Netherlands
For what it is worth I agree totaly with thoth .A 3m long transmission line folded of course may also be a fun and special A woofer with a Qts of 0.2 realy does not have a lot of bas

Remco
  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
4 ohm or 8 ohm woofer in 2 way mmgando Multi-Way 0 4th December 2007 07:14 AM
What can I do with this woofer? Bricolo Multi-Way 5 1st April 2004 09:37 PM
diy sub-woofer takashi Subwoofers 3 19th August 2003 09:16 PM
the best mid-woofer? joz Multi-Way 4 19th March 2003 08:19 AM
Qts of Push-pull woofer and Compound Woofer System... haggy Multi-Way 1 13th December 2001 01:30 AM


New To Site? Need Help?

All times are GMT. The time now is 02:10 PM.


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