Design Check! - 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 3rd February 2011, 11:08 AM   #1
diyAudio Member
 
Join Date: Jan 2011
Default Design Check!

Hi all,

trying my hand at building a 41Hz amp6 in a small portable enclosure of about 30L (yes its more or less a boombox) and just hoping some of you could give it a quick skim to make sure everything is looking right before i go building and blowing up things.

Drivers i plan on using are:

2x Eminence Alpha 8A
http://www.parts-express.com/pdf/290-401s.pdf
and
2x 1" Peerless tweeters
http://www.parts-express.com/pdf/264-1028s.pdf

and with a 2nd order crossover at 2500Hz



Few questions i still have are:
1) This seems to me to be a good driver/tweeter match, anyone disagree?
2) with a 4 ohm tweeter should i add a 4ohm resistor in parrallel? before or after the crossover?
3) any improvements/suggestion/advice you can give before i build?!!

appreciate it guys,

Louis


EDIT: little diagram i made.....
Attached Images
File Type: jpg diagram.jpg (46.3 KB, 92 views)

Last edited by saggybob; 3rd February 2011 at 11:31 AM.
  Reply With Quote
Old 3rd February 2011, 03:19 PM   #2
DougL is offline DougL  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Wheaton IL.
Blog Entries: 30
Quote:
2) with a 4 ohm tweeter should i add a 4ohm resistor in parrallel? before or after the crossover?
No.
__________________
Scienta sine ars nihil est - Science without Art is nothing. (Implies the converse as well)
Mater tua criceta fuit, et pater tuo redoluit bacarum sambucus
  Reply With Quote
Old 3rd February 2011, 08:05 PM   #3
CCU is offline CCU  Denmark
diyAudio Member
 
Join Date: Apr 2007
Location: Kgs. Lyngby
Send a message via MSN to CCU
Quote:
Originally Posted by DougL View Post
No.
That would lower the totalt ohms resistance to 2ohm.. that would be bad the the amp and use unnecessary power for heating the resistor
  Reply With Quote
Old 4th February 2011, 01:35 AM   #4
just another
diyAudio Moderator
 
wintermute's Avatar
 
Join Date: Aug 2003
Location: Sydney
Blog Entries: 22
Hi Louis,

1. I would tend to disagree with point 1 mainly because to avoid beaming you would need to crossover at a low freq (around 1700Hz or lower) for an 8" driver and that tweeter will not be happy being crossed that low. Beaming my not be an issue in a boombox though

2 no as already stated! you can run a mix of 8 ohm and 4 ohm drivers in a speaker, you just need to design the crossover for the correct impedance of each driver. The tweeter doesn't say whether it's sensitivity is 1W/1M or 2.83V/1M so it is hard to tell whether any level differences might cause an issue that needs padding of one or other of the drivers.

3. Your proposed crossover looks like a standard 2nd order crossover. With the rising frequency response on the woofer and especially the peak after 3Khz you might need something a little more complex than that. If you have gone with a textbook design you might want to start reading up on why text book crossovers are a bad idea

Note that the freq response curve on the woofer does not state what the configuration was when the measurement was done so it is hard to make any informed comment about it. when put into your own cabinet the curve will undoubtedly look different anyway

Tony.
__________________
Any intelligence I may appear to have is purely artificial!
Some of my photos
  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
PSU Design Check Please ANDYLASER Power Supplies 14 15th July 2010 11:42 AM
Check this design out kornnylike Subwoofers 6 7th April 2010 07:58 PM
New Here. Will you check me design? SightSeeker1 Subwoofers 19 13th April 2006 03:59 PM
Please check my subwoofer design noodle_snacks Subwoofers 3 30th July 2004 05:19 PM


New To Site? Need Help?

All times are GMT. The time now is 02:24 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