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Multi-Way Conventional loudspeakers with crossovers

Crossover in a very limited space...
Crossover in a very limited space...
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Old 13th March 2018, 06:40 PM   #1
00940 is online now 00940  Belgium
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Default Crossover in a very limited space...

I've started building a kit for a micro-monitor, the microspeaker µ from Quint Audio. It's a very small speaker, barely above 1l of internal volume. Otoh, the crossover is fairly beefy; it's a very inefficient speaker (76db/2.82V, 8R).

The crossover could fit inside the box (barely) but I'd rather move it inside a small stand under the speaker. In either case, it will be really a tight fit.

Is the kind of layout attached ok ? Left side is the woofer section, right side the tweeter. Coils are close but that's hard to avoid.
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Old 13th March 2018, 06:45 PM   #2
rayma is offline rayma  United States
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Quote:
Originally Posted by 00940 View Post
Is the kind of layout attached ok ?
Can you mount some of the parts on the bottom of the board?
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Old 13th March 2018, 07:08 PM   #3
jrh0516 is offline jrh0516  United States
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Seems OK, but I'd work to move the I-cores a bit further apart. Might consider splitting the x-o by putting the tweeter circuit in the box.
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Old 13th March 2018, 07:11 PM   #4
5th element is offline 5th element  United Kingdom
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Placement of coils in crossover networks

Might be of interest.
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Old 13th March 2018, 08:53 PM   #5
00940 is online now 00940  Belgium
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@rayma: that would make the crossover too tall I'm afraid.

@jrh0516: that's a possibility indeed. The components for the tweeter won't age as the electrolytics in the woofer section so I can as well put them inside the speaker itself.

@ 5th element: great link, thx
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Old 15th March 2018, 05:32 PM   #6
00940 is online now 00940  Belgium
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Here are the crossovers. For the tweeters on the left, for the woofers on the right. I will follow jrh0516's suggestion. The part for the woofer will go inside a small stand and the part for the tweeter inside the speaker itself.

Time for the most difficult part now: painting and veneering. I've got walnut burl and Tineo veneers on the way... choices, choices.
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Old 15th March 2018, 05:33 PM   #7
ICG is offline ICG  Germany
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You could use a plate terminal and mount the boards on it.
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Old 15th March 2018, 05:49 PM   #8
andy2 is offline andy2  United States
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Just a side note, does any know what's the typical volume in liter of the xover for a 2way monitor?
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Old 15th March 2018, 06:12 PM   #9
00940 is online now 00940  Belgium
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Here's a quick sketch.

The bottom is a simple rectangle box of black mdf, glued to the bottom of the speaker. The crossover will be screwed to the bottom panel of the speaker, upside down.
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Old 15th March 2018, 07:14 PM   #10
Lojzek is offline Lojzek  Croatia
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Hey there 00940, looks like a very neat little speaker project, although I wonder if there might be something odd with this sensitivity of 76 dB/2.83V. Depending on the XO filter it may be true or not. Is this woofer filter consisting of 2 inductors, resistor and a capacitor a 3rd order electrical (resistor in series with cap) or a 1st order with an RLC in parallel?

Driver sensitivity in infinite baffle is 86 dB/2.83V/1m, so with a full of a bsc it should not be lower than 80 dB, only if filter was causing it.
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