Budget High-Efficiency Speakers? - 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 27th March 2007, 04:17 PM   #1
mathman is offline mathman  United States
diyAudio Member
 
mathman's Avatar
 
Join Date: Feb 2006
Location: Colorado
Question Budget High-Efficiency Speakers?

Hi all. Iíve decided to build some inexpensive high-efficiency speakers, as Iíve never dabbled there before. Since I already have three pairs of speakers in addition to the surround sound setup, these will see garage duty Ė meaning my expectations arenít that high.

I purchased some old Electro-Voice SP12B woofers, which have roughly the following:

Fs: 40-45Hz
Qts: 0.6-0.65
Vas: 160-180 liters

A vented box isnít looking good. With a large sealed box I could get to about 50Hz, which would be OK. Would these be suitable for a TL? I think the answer is yes, but Iím also not terribly familiar with TLs. Iíd like to get a bit more extension if possible. I have three woofers, so I suppose one could be used as a subwoofer of sorts to beef up the low end.

Also, Iím in need of a tweeter for these guys. I vaguely recall hearing that the wooferís sensitivity is about 95dB so horns may be in order, or possibly a bullet tweeter. I donít want to spend a ton of money Ė maybe $100 for tweeters and crossover parts. Iíve looked through the drivers at Parts Express and Madisound, but nothing looks remarkable to me. If anybody has experience with suitable tweeters, Iíd appreciate some guidance. New or used is fine by me.

Any other thoughts? Am I crazy?
  Reply With Quote
Old 28th March 2007, 01:16 AM   #2
diyAudio Member
 
Inductor's Avatar
 
Join Date: Feb 2006
Location: Cascais
They are bicones !!

here, they are selling two vintage boxes for $125. Half of that you will spend in wood.

http://www.ultraelectronicactive.com...-Speakers.html

I think you will spend more in (inexpensive high-efficiency speakers) than you want.
  Reply With Quote
Old 28th March 2007, 04:39 PM   #3
mathman is offline mathman  United States
diyAudio Member
 
mathman's Avatar
 
Join Date: Feb 2006
Location: Colorado
Quote:
Originally posted by Inductor
They are bicones !!

here, they are selling two vintage boxes for $125. Half of that you will spend in wood.

http://www.ultraelectronicactive.com...-Speakers.html

I think you will spend more in (inexpensive high-efficiency speakers) than you want.
If by bicones you mean they have a whizzer cone, then yes. However, Iíve hooked them up and feel they could really benefit from a tweeter. Since I could probably get away with a 3.5kHz crossover, perhaps a dome tweeter would work if the sensitivity was right? I could really use some direction on tweeters.

Not sure where that company is, but if theyíre not in Denver, shipping boxes that big wonít be cheap, and Iím fine with building enclosures. I just donít know what to build. If a TL is practical Iíd like to try that to get a bit more extension than a sealed box. I tried modeling a vented box and didnít like the results Ė either bad response or a positively massive enclosure always resulted.

I already have woofers Ė paid $90 for all three. Iím looking to spend about $80 on a pair of tweeters. Add about $30 for crossover components, and another $60 for wood. $250-$300 total. Is that not in the realm of possibility? Again, these are going in the garage, and Iím setting expectations accordingly.
  Reply With Quote
Old 28th March 2007, 06:20 PM   #4
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

I'd say aperiodic loading possibly, gets the box size downsomewhat.

Usual thing to do is add a supertweeter, with the driver raw.

As the drivers raw, wide and not deep cabinets against a wall.

http://www.partsexpress.com/projects...uma/index.html

possibly use the tweeters from the above, add L-pad tweeter level.

/sreten.
  Reply With Quote
Old 29th March 2007, 12:26 AM   #5
diyAudio Member
 
tomtt's Avatar
 
Join Date: Aug 2002
Location: kansas city mo, and on occasion, around the world ...
Blog Entries: 15
Default these might work...

http://www.partsexpress.com/pe/showd...number=270-049
  Reply With Quote
Old 29th March 2007, 12:49 AM   #6
Duo is offline Duo  Canada
diyAudio Member
 
Duo's Avatar
 
Join Date: Jun 2002
Location: Victoria, BC, Canada
Send a message via ICQ to Duo
The SP12 is really almost a full-range driver. No Goodmans axiom here, but still not bad.

I use them purely as mids in a three way system with phenomenal results. (Yeah, they're more directional than most of you guys will allow, but they do well.)

If I was to use these for a garage or even much better system, I would do them two way, very lightly loaded, with a nearly full transconductance amplifier. (Something like a Pass labs current mode amp.)

Something to critically damp and not over damp these will allow a lot better bass than you expect.

I don't know if you want to work so far on an amplifier for this, so if not, then a good cabinet design for wide range is in order. The aforementioned aperiodic loading could be very nice.
  Reply With Quote
Old 29th March 2007, 07:47 AM   #7
diyAudio Member
 
Inductor's Avatar
 
Join Date: Feb 2006
Location: Cascais
Quote:
" Hello
Better than that! Her are the T/S parameters.
Re=6.7
Sd=535 cm2
Bl=8.76 N/A
Vas=167 liters
Cms=411 uM/N
Fs=45
Qms=5.9
Qes=0.75
Qts=0.665
Pe=65Watts
Xmax=3.3 mm
Eff=94.96 dB

Believe it or not optimum volume is around 450 liters. But you could try 100-150 liters as compromise. This is normal situation considering Q value.

Luc Lacombe "
http://www.decware.com/forums/General/posts/1572.html
  Reply With Quote
Old 29th March 2007, 07:41 PM   #8
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Milliways
Blog Entries: 4
Quote:
Originally posted by sreten
I'd say aperiodic loading.....
... wide and not deep cabinets against a wall.
Sounds like a good idea.
And all you need is a super tweeter.
__________________
Take the Speaker Voltage Test!
  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
high efficiency speaker with a budget of us$1000,00 angeloitacare Multi-Way 21 22nd May 2008 11:23 PM
High efficiency hi-fi speakers, DIY suggestions? Pirium Multi-Way 52 4th February 2008 05:41 AM
high efficiency speakers for 2A3 moo Multi-Way 23 25th February 2006 03:04 PM
Effect of high efficiency speakers mxv146 Multi-Way 9 9th April 2005 11:34 AM
High Efficiency Speakers markkanof Multi-Way 17 9th January 2002 06:00 AM


New To Site? Need Help?

All times are GMT. The time now is 11:22 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