Opinions on Eminence Alpha a 15" - 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 15th February 2011, 08:19 PM   #1
diyAudio Member
 
Join Date: Sep 2008
Default Opinions on Eminence Alpha a 15"

Thinking of doing my first large format OB design and using parallel pairs of Alpha 15's from 250hz on down 2nd order active......opinions on this driver in and up to the intended range? I've heard pros and cons here and there but would like to know if spending more $$$ on woofers in this range is neccessary.......don't have disposable cash flow for this one.

Will also need some feedback on a fullranger or MT section for 250hz and up but that's a topic for another thread.
  Reply With Quote
Old 15th February 2011, 08:39 PM   #2
diyAudio Member
 
Brisso57's Avatar
 
Join Date: Sep 2005
Location: the leafy west of Brisbane
You've seen the twin-15A MJK design paper here:

http://www.quarter-wave.com/Back_Doo...ve_1_30_10.pdf ?

Doug
__________________
A speaker-builder's parable: "That burned down, fell over, then sank into the swamp. But the fourth one stayed up. And that's what you're going to get, Lad, the strongest castle of all."
  Reply With Quote
Old 15th February 2011, 08:45 PM   #3
Banned
 
Join Date: Nov 2006
Troels and others who have heard it, prefer the deltalite II 2515 over the Alpha, however the Qts is vastly different so you have to keep that in mind when deciding the baffle size and what speakers to mate it with.
  Reply With Quote
Old 15th February 2011, 11:32 PM   #4
djn is offline djn  United States
diyAudio Member
 
djn's Avatar
 
Join Date: Oct 2004
Location: Waterford Michigan
I am running a single 15a in "H" frames per Martins paper. I have two of them. I don't see any need to do the double and my room is big.
  Reply With Quote
Old 15th February 2011, 11:49 PM   #5
diyAudio Member
 
Godzilla's Avatar
 
Join Date: Nov 2005
Location: New York
>>> I am running a single 15a in "H" frames per Martins paper. I have two of them. I don't see any need to do the double and my room is big.

Same here djn... and my room is small.

Beta 12LTA in a 3cf box - port size

That said, i never heard any other 15" drivers. I do love the bass from these H-frames! If they creep to far into the 'main driver' the Alpha's do make themselves known. Keep them crossed low as possible and enjoy. Compared to the sealed powered sub i have on hand the H-frames win hands down.

Zilla
  Reply With Quote
Old 15th February 2011, 11:59 PM   #6
ra7 is offline ra7  United States
diyAudio Member
 
Join Date: Feb 2009
Blog Entries: 1
I'm running 15A in singles too. Although, I would not use it over 150 Hz. It doesn't quite have the midrange that a good full range can offer. Even at 150 Hz the sound thickens if you use a 6db/octave crossover.

That said, the deltalites are going to be with me soon, albeit for a different project. I'll give them a go in the OBs and see what I get.
  Reply With Quote
Old 16th February 2011, 12:01 AM   #7
cuibono is offline cuibono  United States
diyAudio Member
 
cuibono's Avatar
 
Join Date: May 2006
Location: City of Angles
I third djn. I used one per side, and never felt lacking in bass. I would impress all my friends with them - they could play very loud.

I think when properly designed, they have no drawbacks besides being large.
  Reply With Quote
Old 16th February 2011, 12:30 AM   #8
diyAudio Member
 
Godzilla's Avatar
 
Join Date: Nov 2005
Location: New York
>>> I think when properly designed, they have no drawbacks besides being large.

Yet they are the smallest footprint i am aware of for a 15" woofer other than a pure open baffle which doesn't sound as good, IMO.

I agree with ra7 about the 'thickening' sound as it creeps up higher in frequency. I use a plate amp to dial them in and think my setting is below 100hz. I'd be happy to try other drivers... i forgot, i have the 15" Jamo buyouts from PE playing on open baffle and they also sound fantastic! There's something about two 15" woofers pumping out bass in a home system that's just intoxicating... i can only imagine how 18" drivers would sound.
  Reply With Quote
Old 16th February 2011, 08:51 AM   #9
Banned
 
Join Date: Nov 2006
Quote:
Originally Posted by Brisso57 View Post
You've seen the twin-15A MJK design paper here:

http://www.quarter-wave.com/Back_Doo...ve_1_30_10.pdf ?

Doug
Somehow I missed that.
Thanks for the link.
  Reply With Quote
Old 16th February 2011, 02:53 PM   #10
djn is offline djn  United States
diyAudio Member
 
djn's Avatar
 
Join Date: Oct 2004
Location: Waterford Michigan
Not to go off topic too much but this works for any sub. On my "H" frames I stacked two layers of scrap 1" marble on top. It makes a very noticable difference. This came about by accendent. I was moving some stuff around in my room and had the system playing. I picked up a box of LPs and set them on the "H" frame for just a minute while I adjusted my stance. I stopped, looked at the "H" frame and took the box off. Then put it on, then took it off. It really seems to tighten up the bass and becomes more clear. Kind of makes sense if you think about how little weight there is in the "H" frames, that woof is pushing the cab around and loosing clarity. P.S., I have my "H" frames on 1" spikes.

P.S.S., I get scrap marble at a marble cutters here locally. They can't sell scrap as no one has found a use for it so they have to pay to get it hauled away.
  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
FS: Vintage high-Qts 15" woofers like Eminence Alpha 15 nl Swap Meet 2 10th June 2009 11:15 PM
For sale: New pair of Eminence Alpha 15" (Australia) gainphile Swap Meet 4 26th February 2009 10:54 PM
Fostex FE207E with Eminence Alpha 15 open baffle sharpi31 Multi-Way 15 21st September 2007 04:20 AM
What should I do with these? (15" Eminence) fusion Subwoofers 13 13th January 2007 09:48 PM
Enclosures for Eminence Sigma 18" and/or Eminence Kilomax 15", PA-sub application esaias Subwoofers 8 10th August 2005 06:17 AM


New To Site? Need Help?

All times are GMT. The time now is 04:55 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