Woofer suggestions for MTM - 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 6th June 2005, 10:21 AM   #1
diyAudio Member
 
Join Date: Jun 2005
Location: Home
Default Woofer suggestions for MTM

Hi everybody

I'm planning a set of speakers for 50/50 HT/music use.

Fairly sure I'll be using the Vifa XT25TG but I'm having trouble find a nice woofer to compliment it without blowing my budget.

I was considering the Vifa M18WO because I've heard its close to the quality of SS without the price tag. However the crossover point would need to be pretty low wouldn't it? Is the M18 worth the extra over the P17WJ which seems to allow for a greater range of crossover points?

I looked at the Hi-Vi M8a but the enclosures would be bigger than I'd like.

I was also looking at the Adire extremis 6.8 but its low sensitivity wouldn't match the tweeter too well.

Can anyone suggest a good woofer for around $60USD that would blend nicely with the XT25 and be relatively noob friendly to design a crossover for?

Also any suggestions on crossover design would be appreciated.

Thanks,
Anonymoose
  Reply With Quote
Old 6th June 2005, 02:03 PM   #2
diyAudio Member
 
dmitriy167's Avatar
 
Join Date: Mar 2004
Location: NJ, USA
There is a general consensus that the P17's bass capabilities are lackluster; it's more of a large-format midrange driver. Just by looking at the specs, the M18 would have better bass, but would not not work well at all above 1kHz. The dip in response from 1kHz to 1.6 and the double peak from 2.5 to 5kHz are the result of cone breakup. For better matches to the XT25, look at the PL18, MG18, and Peerless HDS series. In fact, the Peerless would probably be your best option as it has a very smooth response and a low distortion motor. As far as the Extremis goes, it has pretty uneven response and I wouldn't like to deal with it. Besides, it might be a little too pricey.

Another problem is that the XT25 is not a forgiving tweeter in terms of crossovers. Despite its low resonance, it doesn't like crossover points below 3kHz. There are other good tweeters in the price range that go much lower, like the Morel MDT30 and the Usher 9950. If you don't yet have the XT25, I wouldn't bother with it.
  Reply With Quote
Old 6th June 2005, 02:35 PM   #3
diyAudio Member
 
Join Date: Jun 2005
Location: Home
Thanks for the input. I haven't got any of the drivers yet, just love the sound of the XT25 in my friends bookshelves. I was going to use the Vifa D27, which I've used before but then I heard the XT25 when playing a nice SACD and it sounded great.
  Reply With Quote
Old 6th June 2005, 02:46 PM   #4
diyAudio Member
 
audiobomber's Avatar
 
Join Date: Jul 2004
Location: Sudbury, Ontario Canada
Quote:
Originally posted by dmitriy167
As far as the Extremis goes, it has pretty uneven response and I wouldn't like to deal with it.
What makes you say this? I've only seen the graphs published by Adire, and they're very even. I'd be interested in seeing any third-party measurements.
__________________
Dan
  Reply With Quote
Old 7th June 2005, 06:03 PM   #5
diyAudio Member
 
dmitriy167's Avatar
 
Join Date: Mar 2004
Location: NJ, USA
I would not call the Adire FR graph very even. From 90Hz to 5kHz, it fluctuates by about 8dB. Plus, don't forget that the curve is smoothed, so the actual response would be worse. It's pretty clear that this woofer needs some corrective filtering, and I would't try that without measuring equipment. It may be a great woofer, but it is definitely not for beginners.
Attached Images
File Type: gif extremisfr.gif (11.3 KB, 255 views)
  Reply With Quote
Old 7th June 2005, 06:44 PM   #6
diyAudio Member
 
audiobomber's Avatar
 
Join Date: Jul 2004
Location: Sudbury, Ontario Canada
Quote:
Originally posted by dmitriy167
I would not call the Adire FR graph very even. From 90Hz to 5kHz, it fluctuates by about 8dB. Plus, don't forget that the curve is smoothed, so the actual response would be worse.
But the response at 90 Hz would be impacted by the enclosure, and all manufacturers graphs are smoothed.
I guess what I'm looking at is the lack of large breakup excursions above 2kHz such as you see with Scan-Speak drivers for example. I have a major aversion to notch filters, and I thought you could get away without one using the Extremis.
__________________
Dan
  Reply With Quote
Old 7th June 2005, 07:13 PM   #7
diyAudio Member
 
dmitriy167's Avatar
 
Join Date: Mar 2004
Location: NJ, USA
Quote:
Originally posted by audiobomber


I guess what I'm looking at is the lack of large breakup excursions above 2kHz such as you see with Scan-Speak drivers for example.

The Extremis lacks the breakup peaks above 2k because it has a flimsier poly cone and not an ultra-stiff carbon fiber or Kevlar one, but that's probably what's causing the broad peak from 400Hz to 1k and the dip right after it. If you look at the SS FR curves, none of them have those midrange fluctuations. Also, the SS curves have much less smoothing than the Adire ones, and all the peaks and dips are probably worse in the Extremis than they seem. But the only way to know for sure is to measure.
  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
Sub-woofer amp suggestions hybridfiat Subwoofers 3 29th May 2008 03:25 PM
Suggestions for good 6.5' woofer Greg F Multi-Way 0 11th July 2007 06:27 AM
Woofer suggestions (UK) FullThrottleRic Multi-Way 7 17th August 2006 01:43 PM
Woofer Suggestions For PR170MO? delwon Multi-Way 4 31st December 2003 10:59 PM


New To Site? Need Help?

All times are GMT. The time now is 12:14 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