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Old 22nd February 2016, 06:41 PM   #1
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Default MTM Boombox Crossover Help

Looking to help my brother-in-law with a science project for class. He mentioned building a boombox and explaining how everything works. I have 4 W5-1611SA woofers and a pair of BC25SC06 tweets which I believe would make a great MTM. Both drivers, I believe, look pretty managable but I dont know where to start with the crossover. I know the W5 is a "fullrange" but I have read where it benefits a tweeter, so my thougbt was to cross somewhat high (5-8khz). They will be powered from an amp delivering about 70wpc. Havent settled on an enclosure yet, but Im leaning towards vented just to get into the F3 70-80hz range. Would anyone be willing to help on the crossover design?
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Old 22nd February 2016, 06:54 PM   #2
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I guess that MTM likes low crossover points, more towards 1 kHz than 5 kHz.
Then, what science has to do with boom box ? Carry-a-bility ? battery operation ? Just by making an enclosure sharing more than a speaker is a bit nonsense
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Old 22nd February 2016, 07:03 PM   #3
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I dont understand what you are asking
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Old 22nd February 2016, 07:24 PM   #4
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What's a boombox ?

Boombox is a common term for a portable cassette and AM/FM radio (and, beginning in the 1990s, a CD player) with an amplifier, two or more loudspeakers and a carrying handle https://en.wikipedia.org/wiki/Boombox
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Old 22nd February 2016, 07:31 PM   #5
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I see that you are alot of help...

The boombox that I will be making is that style, where there will be stereo speakers powered by a radio in one enclosure with two individual speaker chambers. Yes it will be portable. All of which should not concern anyone with the question at hand. Im aware that some BSC could come into play, but this is not a critical listening speaker. I am just looking for a simple crossover that is more appropriate than the online crossover calculators
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Old 22nd February 2016, 07:49 PM   #6
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Quote:
Originally Posted by picowallspeaker View Post
I guess that MTM likes low crossover points, more towards 1 kHz than 5 kHz
It's not just a guess, as I see often it mentioned.
Having two near sources, such the M's of a M-T-M, there are some negative effects such as interference which might be destructive or additive.
BSC pertains to the lower register and it might not be a concern when using two woofers
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Old 22nd February 2016, 08:15 PM   #7
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Should i do things differently? 2.5way? Or just 2way?
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Old 22nd February 2016, 08:38 PM   #8
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Speakers should stay separate ( L and R channels) so anything that deviates from this it can be whatever
A)you can connect them in series and put a capacitor across one ( so a series crossover)
B)you can put 1 coil>speaker>another coil>speaker -sort of 0.5...( a more elaborate filter might be required, such caps etc for 2nd order filter ) +tweeter
C) classic 2 way -I got good results with 1st order on woofer ( fullrange) and 3rd order on Tw

...and -oh!- I copy the schemes
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Old 22nd February 2016, 08:50 PM   #9
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Just to clear any confusion, the left and right speakers will be in their own seperate enclosures. They will not share the same airspace. So do you recommend 2way 1st on woof and 3rd on tweet?
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Old 22nd February 2016, 09:18 PM   #10
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I don't know, it depends on the behaviour ("response") of the speakers.
I'd say go on with full speakers then you can decide if less is better.
2.5 might be good, I've never tried it. If it's for a high ( 70 W it's a lot ) power you need to distribute it to more and more speakers.
I see that the W5-1611SA is 8 Ω and has a very pronounced convexity of the cone profile.
Aside from this ( I cannot find the consequence of it ) you can try to series connect them -so 16 Ω load- and put a cap across one speaker's terminals
try 10-20-30 uF, maybe a 30-40 Ω resistor ( 20 W or more ) across plus and minus to tame impedance peak .
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