Need help with DIY speaker project - 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 10th January 2002, 11:57 PM   #1
diyAudio Member
 
Join Date: Jan 2002
Location: Wisconsin, USA
Default Need help with DIY speaker project

My first time posting here. Looking for some advice before I begin another project. I need new speakers to be used for diverse rock & roll music listening. They’re going into a 12’ x 22’ family room. My goal is to get the highest quality sound reproduction possible with just two constraints: #1) a budget of max $500 for drivers and crossover (cabinet materials and other supplies would be extra and are not included in the $500.) and #2) wife does not want “big bulky” floor standing speakers but likes the “narrower” MTM floor standing tower speakers. So given this background, I’m leaning toward building two MTM (6.5”, 1”, 6.5”) tower speakers, each with an amplified 12” side woofer built in. Q1: Do you think getting the bass through a built-in side woofer will provide a better listening-quality than having a separate sub-woofer? The sub-woofer would end up being located at least 6 feet away from the towers?

I also have a second question. Today I listened to a bipolar Definitive BP2002TL (retail $999 ea) for the first time and actually liked it slightly better than comparably priced ($999 to $1399) Boston Accoustics, Snell and Klipsch, which were the other brands that this particular dealer had on the floor. My mind tells me that the bipolar sound effects should actually detract from the sound quality, but my ears liked it. Q2: What is the general feeling towards this bipolar concept? Is it a good thing or a bad thing? Can the bipolar sound effect be reproduced by other means e.g. electronically or by simply adding additional speakers? Do you know of any successful DIY projects that incorporated this bipolar concept into their design?

Thanks for the help
SteveO
  Reply With Quote
Old 11th January 2002, 01:38 AM   #2
BAM is offline BAM
diyAudio Member
 
Join Date: Sep 2001
Location: Carmel, IN; West Lafayette, IN
Send a message via AIM to BAM
If you really want a lot of bass power, a powered subwoofer is generally a good thing if you use a reciever (rather than a reciever/preamp and an EQ and separate amplifiers). I drive my speakers using a Sherwood reciever, and I notice that the output from the reciever doesn't have that much bass, it's only the sub output that really carries the bass. So if you have a reciever like I do, then make a pair of ported towers with a pair of the Axon 6.5" midbasses at Parts Express (part number 297-500) and a Dayton 1 1/8" silk-dome tweeter (part number 275-070, nice tweeter in my opinion)

Even hard rock and roll music can benefit from well-made speakers. The Axons only need 1.38 cu. feet, so a pair of MTM bookshelves on stands seems to be the best option. You will enjoy the detailed sound provided by the lightweight diaphragm of the Dayton tweeter. The Axons will provide nice bass down to 55 Hz (thanks to their relatively long cone excursion) and they have an impedance of 4 ohms, so that when wired in series, they will present your amplifier with an 8-ohm impedance to match the tweeter.

Get a velodyne subwoofer. You will not expect much from those unassuming little cubes until you play some music with hard-hitting, low bass. Since Velodynes use servo feedback loops, they have unparalleled cone control, and they do go LOW. The servo loop makes sure the cone is exactly where it needs to be when it needs to be there. Available at your local Circuit City or CircuitCity.com.
  Reply With Quote
Old 11th January 2002, 02:11 AM   #3
JoeBob is offline JoeBob  Canada
diyAudio Member
 
JoeBob's Avatar
 
Join Date: Nov 2001
Location: Montreal, Canada
I have to admit, velodynes sound nice for my father owns one. But I'd say to go with an amplified 12" woofer in each speaker. First of all you get stereo bass, which I find sounds much nicer. Although the parts for the active crossover for the woofer as well as an amplifier (DIY or pre-made) would rise the total cost.

What should work pretty well for you is to make a 3-way speaker with the 12" woofer passive crostover power by the same amp as your midranges and tweeters. That is, if you don't want to spend the extra cash for the active route.
  Reply With Quote
Old 11th January 2002, 02:33 AM   #4
diyAudio Member
 
Join Date: Jan 2002
Location: Wisconsin, USA
Thanks for the feedback. Stereo bass has intuitive appeal to it and since I don't require an "excessive" amount of bass, I'll try it with the side woofers.

SteveO
  Reply With Quote
Old 11th January 2002, 02:37 AM   #5
Warp Engineer
On Holiday
 
AudioFreak's Avatar
 
Join Date: Oct 2001
Location: Queensland, Australia
if you go that route you'll need to build an enclosure in an enclosure so that the mid driver sees the right volume of air.
  Reply With Quote
Old 11th January 2002, 02:45 AM   #6
diyAudio Member
 
Join Date: Jan 2002
Location: Wisconsin, USA
Thanks. Do you know of any kits that have done this?
  Reply With Quote
Old 11th January 2002, 03:20 AM   #7
Warp Engineer
On Holiday
 
AudioFreak's Avatar
 
Join Date: Oct 2001
Location: Queensland, Australia
Well just so you can have a look @ it, the Audax Home Theatre Center Channel is done like this
  Reply With Quote
Old 11th January 2002, 12:20 PM   #8
Super is offline Super  United States
diyAudio Member
 
Join Date: May 2001
Location: Connecticut
Send a message via AIM to Super
Just a word of advice: make sure that the rear wall of the midrange subenclosure is angled. This will help break up standing waves. For damping, you might want to try some thick felt padding, and lightly stuff the chambers (if you are using a sealed design, not ported.)
__________________
Bryan
  Reply With Quote
Old 11th January 2002, 04:28 PM   #9
navin is offline navin  India
diyAudio Member
 
navin's Avatar
 
Join Date: Jan 2002
Location: Mumbai (Bombay), India
Send a message via MSN to navin Send a message via Yahoo to navin
Well given a $500 budget I would look at a Vifa or Vifa/Peerless combo. Using 10" woofers and 6" midbass drivers.

4 Vifa 6" woofers = $150
2 Vifa D27TG45 tweeters = $50
2 Peerless 831727 or Vifa M26 woofers = $ 150
2 Crossovers = $100

The 10" works well in a 1.8 cu. ft sealed box
The MTM would require a 1.2 cu. ft. sealed box (or more preably 2 0.6 cu. ft sealed boxes).

Assuming the internal dimension are: (W x H x D)
6" x 18" x 20" = 1.2 cu. ft.
6" x 24" x 22" = 1.8 cu. ft.

You have the boxes that can sit on top of each other.
There are other combinations that I can think of too but this is the simplest.

Another combination could use Audax 6" drivers instead of Vifa or if you can spend more Vifa PL series drivers. If you can have a bigger sub box (2.5-3 cu. ft) then a variety of 12" drivers (Shiva, Audio Concpets, etc... are available.)

Obviously any extra options, like biamping (needs an active crossover and a spare amp) will cost more.

Hope this helps

Regards
navin
  Reply With Quote
Old 11th January 2002, 10:10 PM   #10
diyAudio Member
 
Join Date: Jan 2002
Location: Wisconsin, USA
Navin yes this does help. Although I prefer to have one box instead of two. Thx.
  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
Help with speaker project davethomp Multi-Way 3 5th March 2009 12:18 AM
Speaker Project mot on/off Multi-Way 6 19th November 2007 05:11 PM
My first Speaker Project :) Robertburchell Subwoofers 9 7th July 2006 03:11 PM
speaker project help minh_827 Multi-Way 7 26th April 2005 06:33 AM
old speaker question, bullet midrange question & link to speaker project wallijonn Multi-Way 10 5th November 2002 06:03 AM


New To Site? Need Help?

All times are GMT. The time now is 09:47 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