Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

Budget DIY 3-way 4 speakers
Budget DIY 3-way 4 speakers
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 June 2018, 12:33 AM   #1
db035 is offline db035
diyAudio Member
 
Join Date: Jun 2018
Default Budget DIY 3-way 4 speakers

ND25FA-4 Tweeter
RSP100P-4 or nd105-4 mid speaker
SD215a-88 Subwoofer

Should turn out good with both but i think the aluminium cone would cross better. Its my first speaker build. Goal: flat fq response. What do you think?

Last edited by db035; 10th June 2018 at 12:48 AM.
  Reply With Quote
Old 10th June 2018, 04:30 AM   #2
LineSource is offline LineSource  United States
diyAudio Member
 
LineSource's Avatar
 
Join Date: Sep 2003
Location: SiliconValley
The low 86db SPL sensitivity of the SD215a-88 Subwoofer makes it a poor passive crossover match with a 88.5db midrange. Unless you bi-amp, you would have to attenuate the mid and tweet about 4-5db.

The 91db sensitivity Dayton RS225-4 aluminum cone woofer looks like a good match for your goals.

Dayton Audio RS225-4 8" Reference Woofer 4 Ohm 91db sensitivity Part # 295-376 Fs=33Hz Re=3.2ohms. -F3=35Hz(good bass) in a 1.5cuft ported cabinet

YOUR AMPLIFIER MUST EASILY DRIVE 4-ohm LOADs.

These are popular drivers, and you might find a proven crossover for this combination. OTHERWISE..
VituixCAD is an EXCELLENT FREE speaker design package. Parts Express website provides the Dayton FRD ZMA data files required
==============
To reduce cabinet edge diffraction, some small 3-way designs build a beveled edge "truncated pyramid" style cabinet, or route large radius quarter-rounds into the edges.
==========
==========
-ND25FA-4 Tweeter Re=3.2ohms 90db
-RSP100P-4 or nd105-4 mid speaker Re=3ohms 88.5db
-SD215a-88 Subwoofer Re=3.2ohms, SPL = 86db
Attached Images
File Type: jpg Small Room 3_way.jpg (180.4 KB, 415 views)
File Type: jpg 3way 4ohm HT .jpg (190.2 KB, 405 views)
  Reply With Quote
Old 10th June 2018, 09:15 AM   #3
db035 is offline db035
diyAudio Member
 
Join Date: Jun 2018
Cool. Thanks. Im located in europe so my choices are atm. RS225P*4 93.8 db or DCS205*4 88.6db subs. I think i read somewhere on the forum that subs r supposed to be a little more sensitive than mid. Should i go for 93.8db then attenuate as needed?
  Reply With Quote
Old 10th June 2018, 01:26 PM   #4
andy19191 is offline andy19191  Europe
diyAudio Member
 
Join Date: Apr 2005
Location: -
Assuming this will use a passive crossover? Are you familiar with what is often called baffle step correction and how it determines desirable relative woofer and mid sensitivities and to some extent baffle width? If not, I would suggest finding out a bit about it before trying to pick suitable drivers.
  Reply With Quote
Old 10th June 2018, 04:20 PM   #5
bbe22 is offline bbe22  South Africa
diyAudio Member
 
Join Date: Mar 2009
The low 86db SPL sensitivity of the SD215a-88 Subwoofer makes it a poor passive crossover match with a 88.5db midrange. Unless you bi-amp, you would have to attenuate the mid and tweet about 4-5db.

rather poor advice to OP.....nothing wrong with attenuating mid and tweeter to match bass. (read up on midrange gain in 3 way design, too....)
OP needs to find a good mentor , first design 3 way is no joke to get right, rather find a reputable kit to build out
  Reply With Quote
Old 11th June 2018, 06:13 AM   #6
db035 is offline db035
diyAudio Member
 
Join Date: Jun 2018
I made the project in the programme you suggested. I attenuated 93db and 90db drivers to match the mid. It will be louder than attenuating to the previous sub of 86. It will reach 100db no problem.
  Reply With Quote
Old 11th June 2018, 07:30 AM   #7
db035 is offline db035
diyAudio Member
 
Join Date: Jun 2018
Quote:
Originally Posted by LineSource View Post
The low 86db SPL sensitivity of the SD215a-88 Subwoofer makes it a poor passive crossover match with a 88.5db midrange. Unless you bi-amp, you would have to attenuate the mid and tweet about 4-5db.

The 91db sensitivity Dayton RS225-4 aluminum cone woofer looks like a good match for your goals.

Dayton Audio RS225-4 8" Reference Woofer 4 Ohm 91db sensitivity Part # 295-376 Fs=33Hz Re=3.2ohms. -F3=35Hz(good bass) in a 1.5cuft ported cabinet

YOUR AMPLIFIER MUST EASILY DRIVE 4-ohm LOADs.

These are popular drivers, and you might find a proven crossover for this combination. OTHERWISE..
VituixCAD is an EXCELLENT FREE speaker design package. Parts Express website provides the Dayton FRD ZMA data files required
==============
To reduce cabinet edge diffraction, some small 3-way designs build a beveled edge "truncated pyramid" style cabinet, or route large radius quarter-rounds into the edges.
==========
==========
-ND25FA-4 Tweeter Re=3.2ohms 90db
-RSP100P-4 or nd105-4 mid speaker Re=3ohms 88.5db
-SD215a-88 Subwoofer Re=3.2ohms, SPL = 86db
By quarter-rounds you mean like on your design (gray speaker)?
  Reply With Quote
Old 11th June 2018, 08:01 AM   #8
andy19191 is offline andy19191  Europe
diyAudio Member
 
Join Date: Apr 2005
Location: -
Can you find examples of competent 3 way designs that pad down a woofer? What power rating for the resistors would you choose?

Desktop speakers where the user sits about 1m away often target about 105dB maximum SPL (excluding what would be handled by a sub). What would be a reasonable equivalent for a 3 way with the listener 3 to 4m away in a reasonable sized room?

When a person designs their first 3 way mistakes should be expected. Too much preparation is likely to lead to the speaker never getting built but without some knowledge of the issues involved the resulting speaker is likely to perform relatively poorly. Perhaps that is fine for a first go so long as something to learn from is built fairly quickly and cheaply.
  Reply With Quote
Old 11th June 2018, 08:28 PM   #9
db035 is offline db035
diyAudio Member
 
Join Date: Jun 2018
You have a good point. Honestly when i heard the klipsch rp15m pair i went nuts when i saw it would cost me 2k to get 4 of em plus 4 subwoofers so i tought why not make my own although i came to the realization its not gonna be as easy as make a crossover. So i probably am gonna give up and pay.
  Reply With Quote
Old 11th June 2018, 11:41 PM   #10
Michael Chua is offline Michael Chua  United States
diyAudio Member
 
Michael Chua's Avatar
 
Join Date: Jul 2006
Location: Calais, ME
Quote:
Originally Posted by db035 View Post
...when i saw it would cost me 2k to get 4 of em plus 4 subwoofers....
Is this for Home Theater?
__________________
ampslab
  Reply With Quote

Reply


Budget DIY 3-way 4 speakersHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Renovating budget speakers on a budget HaerdenC Construction Tips 6 25th January 2018 05:13 PM
Budget valve amp speakers Knoffers Full Range 10 7th December 2010 07:12 PM
Budget speakers, what would you buy? cerupcat Full Range 12 24th November 2007 01:31 AM
Stereo amp and speakers on a budget hifipenguin Everything Else 2 11th April 2005 06:40 AM
$300 budget for first DIY speakers, opinions? 5.0 Multi-Way 18 31st January 2005 05:24 PM


New To Site? Need Help?

All times are GMT. The time now is 03:06 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki