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Multi-Way Conventional loudspeakers with crossovers

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Old 24th October 2017, 03:51 AM   #1
lee1964 is offline lee1964  Australia
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Hi Im seeking some help here,

Im a mac user due to being in the graphic arts industry and my options on speaker design software seem to be limited so I would greatly appreciate some design help as all the online calculators I can find only seem to allow for a single woofer and not an MTM arrangement which is what I pan on doing.

I am restricted only in width to approx 6 inches (150mm) but height and depth are pretty open, I have plugged the driver specs into mh audios box calculator and it seems somewhere around 3.5 to 4-5 litres works well but it doesnt allow for multiple drivers and the and associated port specs.

could someone here please help me with the box design

I have in my possesion
4 x AuraSound NS3-193-8A 3" Extended Range Driver 8 Ohm

and 2 x Dayton Audio ND20FB-4 Rear-Mount 3/4" Soft Dome Neodymium Tweeters

I was looking at using a second order Linkwitz Rieley crossover around the 5k area

My hearing is pretty bad above 6k due to years of playing in bands so having a slightly hot tweeter may be an advantage to me?

thanks in advance for any suggestions

Lee
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Old 24th October 2017, 04:29 AM   #2
planet10 is offline planet10  Canada
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The NS3 is probably the bass king of 3” drivers. I put mine into a 1.5 litre sealed box, but there is a Gregg-the-Geek design with a much larger box that extracts quite an amazing amount of bass out of them.

For 2 drivers you just double the box volume size. If you are doing a vented box, use 2.

This goes <55 Hz F10 in 3-7 litres (sealed vol above a certain size is uncritical) so double for 2 drivers. The higish Q means they aren’t ideally suited to a reflex box.

I cannot quickly find a vented alignment that i could live with.

dave
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Old 24th October 2017, 04:31 AM   #3
planet10 is offline planet10  Canada
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Quote:
Originally Posted by planet10 View Post
Gregg-the-Geek design
Here is the thread… A little MM two-way i recall there being a pdf i can’t find it. Of the linked files i only have the XO.

dave
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Old 24th October 2017, 04:43 AM   #4
lee1964 is offline lee1964  Australia
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Thanks I will check it out later
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Old 24th October 2017, 05:08 AM   #5
lee1964 is offline lee1964  Australia
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given the high Q how would open baffle go?

Ive always liked the concept of open baffle speakers

Lee
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Old 24th October 2017, 05:41 AM   #6
LineSource is offline LineSource  United States
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There are a few diy MTM speakers which use these drivers. You can run these crossovers through your simulation setup to compare results.

Help with first design - Techtalk Speaker Building, Audio, Video Discussion Forum

You can use Jim Griffin's MLTL crossover in an MTM with H~15" and W=5" to capture his baffle diffraction measurements.

Jim Griffin's Aura T-line 2-way - Techtalk Speaker Building, Audio, Video Discussion Forum
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Old 24th October 2017, 06:10 AM   #7
planet10 is offline planet10  Canada
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Quote:
Originally Posted by lee1964 View Post
given the high Q how would open baffle go?
DEpends on how big the baffle is. Given your stated costraints not very low.

dave
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Old 24th October 2017, 06:13 AM   #8
lee1964 is offline lee1964  Australia
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I Love the look of Jim Griffins design but I cant quite stretch to the required height for the transmission line unless it could be folded internally, and Im really too much of an amateur to wrap my brain around the concept, would folding it internally and halving the height of the bottom chamber wit a diagonal divider change other parameters?

Lee
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Old 24th October 2017, 06:14 AM   #9
planet10 is offline planet10  Canada
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Jim’s ML=TL could be folded.

dave
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Old 24th October 2017, 06:15 AM   #10
lee1964 is offline lee1964  Australia
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Quote:
Originally Posted by planet10 View Post
DEpends on how big the baffle is. Given your stated costraints not very low.

dave

thanks I thought you would say something like that

Lee
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