Proposal for new 3-way system - 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 22nd January 2014, 11:33 AM   #1
diyAudio Member
 
Join Date: Jan 2013
Default Proposal for new 3-way system

So, given what I've learnt so far in my somewhat short speaker building career, my next planned project is going to be a simple(?) 3-way system.

I'm currently looking at using the following drivers:

http://www.tymphany.com/files/HDS-P830869%20Rev1_0.pdf
Overview of DMB-A Drivers_HiVi,Inc
Product information:RT1C-A Isodynamic Tweeter

A peerless Nomex 8", a 2" midrange and ribbon tweeter (this would also be my first build with a ribbon)

From the data sheets I was planning on xo at 1 to 1.5kHz and 7.5 to 10kHz,

Just wanted to see other opinions on this combination of drivers before I go further with calculations for the crossover.

Design goals:
Accuracy of sound for studio monitoring, potentially at high levels
Cost Goals:
In line with above driver selection, basically under $600 for xo and driver electronics

I would be willing to consider a 2-way but felt this method would avoid crossing over in any critical audio spectrum, current thinking is for 2nd or 4th order crossover at lower end, 1st order high end
obviously electrical vs practical crossover slopes are likely to be different due to the nature of the drivers.

One of my main questions is how people feel about the DMB-A, if it's up to the task of accuracy in a monitor, and if i can run it down to 1kHz (and what level xo that would need, 2nd or 4th acoustic slope)

Also, any people with experience of driver matching with hivi/peerless?

I've come to believe that well matched components are critical for accurate stereo imaging

Last edited by nannoo; 22nd January 2014 at 11:54 AM.
  Reply With Quote
Old 23rd January 2014, 01:46 AM   #2
diyAudio Member
 
Join Date: Sep 2012
Location: Maine, Bangor-area
IMO it is better for the lower cross-over frequency to be in the 100s of Hz, below the mid-band of frequencies where the ear is most sensitive. That means that your mid-range driver must be larger than 2" dia. to not distort when handling the lower end into the 100s of Hz. The mid-range driver can be perhaps 3" to 4".

If you want to really hear the sound of the ribbon tweeter, then I would say let it's range dip below 7.5 kHz as much as possible as there is not much intensity in the music spectrum at frequencies higher than 10 kHz.

Many have said, and I think it is true, that the successful design of a 3 way is much more difficult than a 2 way. So if you haven't done so already, it's time to do some reading.

Regards,
cT
  Reply With Quote
Old 23rd January 2014, 01:57 AM   #3
adason is offline adason  United States
diyAudio Member
 
adason's Avatar
 
Join Date: Nov 2004
Location: Maryland
your approach is ok nannoo...1.5k and 10k are good choices...I built similar 3way with 6" cone, 2"dome and 0.75" dome, similar logic
more on crossover selection:
Design Criteria
  Reply With Quote
Old 23rd January 2014, 02:19 AM   #4
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

There is no such thing as a simple 3 way, and very much
lots of "simple" 3 ways that are appallingly very wrong.

Dome mid this is the daddy :
Zaph|Audio - ZDT3.5

Very different is :
https://sites.google.com/site/undefinition/tarkus
and :
https://sites.google.com/site/undefi...diy-sunflowers

rgds, sreten.

Zaph|Audio

The DMB-A is ok but I'd expect off axis to be very
poor if used anywhere above say around 4KHz.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
  Reply With Quote
Old 23rd January 2014, 04:07 AM   #5
diyAudio Member
 
LineSource's Avatar
 
Join Date: Sep 2003
Location: SiliconValley
Design goals: Accuracy of sound for studio monitoring, potential high levels
-------avoid crossing over in any critical audio spectrum
Cost Goals: Under $600 for xo and driver electronics.

A well reviewed bookshelf speaker like the NHT 3-way uses 8" woofer + (2" dome mid + 0.75" dome tweeter) to match polar response better than a planar tweeter can.

Human vocal range goes from 80Hz bass voice to 1,100 soprano. Many pro studio monitors use a 10" - 12" midbass to keep voices on one speaker. The EconoWave (10"-12" + SEOS waveguide) are popular studio monitors, and might be an option for your needs.

SB Acoustics offers great speakers at modest prices. Using a ~6" midbass offers coherent vocals and good polar response up to ~2Hz for 1"dome marriage. There are several DIY 2-way ~1800Hz crossovers for the 6" SB17NRXC35-4 midrange and SB29RDNC-4 dome tweeter, plus 3-way DIY crossovers which add 8" to 12" woofers. Extensive bass gain is requred for baffle step and room effects. All passive design often use two woofers, while active Xover designs can just increase bass gain. The 8" Peerless is a good option.


SB Acoustics 3 ways two 8" woofers

Mandolin Speaker Kit / Pr Mandolin Kit 45Hz bass
Attached Images
File Type: jpg NHT 3WAY.jpg (18.7 KB, 237 views)
File Type: jpg SB_TM_WW LowDiffraction.jpg (128.8 KB, 238 views)
  Reply With Quote
Old 23rd January 2014, 05:49 PM   #6
adason is offline adason  United States
diyAudio Member
 
adason's Avatar
 
Join Date: Nov 2004
Location: Maryland
no personal experience with these, just for reference
CASABLANCA MK IV
  Reply With Quote
Old 26th January 2014, 11:58 AM   #7
Juhazi is online now Juhazi  Finland
diyAudio Member
 
Juhazi's Avatar
 
Join Date: Mar 2007
Location: Jyväskylä
A dome has smoother off-axis response that a cone of same diameter. But a dome has more trouble in the low end. This make speaker desing wih dome midrange very challenging. Baffle width is an important factor and besides that crossover frequencies should be set based on directivity and distortion as guidelines.

Here are specs of Visaton 50mm dome DSM 50 FFL - 8 Ohm.
Dayton 75mm dome goes lower but looses dispersion above 3kHz
__________________
AES Associate Member / My DIY speaker history: -74 Philips 3-way, -82 Hifi 85B, -07 Zaph L18, XLS10+PR/Hypex, -08 CSS125FR, -08 Hifitalo AW-7, -08 TangBand FR, -09 MarkK ER18DXT, -13 PPSL470, -13 AINOgradient
  Reply With Quote
Old 26th January 2014, 01:20 PM   #8
adason is offline adason  United States
diyAudio Member
 
adason's Avatar
 
Join Date: Nov 2004
Location: Maryland
Domes are best suited for 4-way applications. Juhazi, you are spot on, they have to be crossed quite high. I like domes...they have their place.
  Reply With Quote
Old 26th January 2014, 02:27 PM   #9
adason is offline adason  United States
diyAudio Member
 
adason's Avatar
 
Join Date: Nov 2004
Location: Maryland
nannoo, if you do not want to invent anything new, and would refer to copy someone else well documented design, here is one:
http://www.humblehomemadehifi.com/do...20Box_copy.pdf
  Reply With Quote
Old 26th January 2014, 02:31 PM   #10
diyAudio Member
 
Keruskerfuerst's Avatar
 
Join Date: May 2007
You can consider using the manger wandler and a the visaton TIW 250XS.
__________________
Houston, we have a problem!
  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
Need a proposal for a stereo amp freestream Tubes / Valves 40 20th August 2011 11:40 PM
A modest proposal.... ThorstenL The Lounge 41 7th June 2011 11:21 PM
2 way design proposal- would appreciate help johnbomb Multi-Way 4 29th January 2011 07:14 PM
New Proposal bjackson Multi-Way 3 14th March 2005 02:33 PM


New To Site? Need Help?

All times are GMT. The time now is 06:50 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