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Old 22nd January 2014, 11:33 AM   #1
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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:
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.
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Old 23rd January 2014, 01:46 AM   #2
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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.

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Old 23rd January 2014, 01:57 AM   #3
adason is offline adason  United States
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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
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Old 23rd January 2014, 02:19 AM   #4
sreten is offline sreten  United Kingdom
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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 :
and :

rgds, sreten.


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
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Old 23rd January 2014, 04:07 AM   #5
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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, 240 views)
File Type: jpg SB_TM_WW LowDiffraction.jpg (128.8 KB, 241 views)
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Old 23rd January 2014, 05:49 PM   #6
adason is offline adason  United States
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no personal experience with these, just for reference
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Old 26th January 2014, 11:58 AM   #7
Juhazi is offline Juhazi  Finland
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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
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Old 26th January 2014, 01:20 PM   #8
adason is offline adason  United States
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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.
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Old 26th January 2014, 02:27 PM   #9
adason is offline adason  United States
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nannoo, if you do not want to invent anything new, and would refer to copy someone else well documented design, here is one:
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Old 26th January 2014, 02:31 PM   #10
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You can consider using the manger wandler and a the visaton TIW 250XS.
Houston, we have a problem!
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