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Old 5th July 2012, 08:12 PM   #1
OllBoll is offline OllBoll  Sweden
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Default Open baffle decoupling midbass / midrange, good or overkill?

Hello there all.

I'm planning my open baffled dipole and just wondered about decoupling...

My midbass will cover 80 hz @ LR4 and upwards to 400 @ LR4 where my midrange will take over. The question is if decoupling those two is worth it in practice, or if it's just more bothersome to build and plain overkill

I'm not planning to shake the house with bass but rather listen to simple music at non ear damaging levels.
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Old 5th July 2012, 08:15 PM   #2
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With that XO point you can make a baffle-less mid and just suspend the mid driver using wires. I've done it, and it works like a dream. :-)
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Old 5th July 2012, 08:18 PM   #3
OllBoll is offline OllBoll  Sweden
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Won't the driver then act as a pendulum moving the driver back and forth instead of moving the air or is the effect so slight it can be ignored from the midrange and upwards?
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Old 5th July 2012, 08:22 PM   #4
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Yes, and thats the whole point - the pendulum. That creates a very linear decoupling with low resonant frequency.

I have done this with a 21" woofer as well... the driver stands very still, only the cone moves any significant amount. It looks crazy, but it works!

Click the image to open in full size.
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Old 5th July 2012, 08:37 PM   #5
OllBoll is offline OllBoll  Sweden
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It's certainly an interesting concept. And when you think about it when coupling directly with the midbass shouldn't it vibrate more?

I might as well try it, what I wanted most was to avoid the hassle with separate enclosures that that kinda fold into each other like the orion because that would make the midbass section so wide

Then the second question becomes, would it be worth it to decouple the swing frame from the midbass or is that just plain overkill Though if I try I would probably connect the swing frame and the midbass for the above convenience reasons.
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Old 5th July 2012, 08:40 PM   #6
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You can do like this: The swing frame is attached to the woofer baffle. This worked well with almost no vibration transfer between the woofer and the mid.

Click the image to open in full size.
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Old 5th July 2012, 08:48 PM   #7
OllBoll is offline OllBoll  Sweden
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Nice, then I guess the first iteration will have frame connected to the woofer =)

Now the question is just how large I should make the woofer's baffle, it's one thing I've wondered about:

When simulating in edge you can build a quite large baffle where dipole peak is at top end crossover and still be a full octave away from dipole null but all others here (you included there) seem to build fairly small baffles for the midwoofers. Is there some other reason like say that the nulls are more prominent at lower frequencies or is it just cosmetic changes such that the woofer doesn't protrude more than the midrange?
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Old 5th July 2012, 08:52 PM   #8
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Its mostly cosmetic reasons why we dont build very large woofer baffles I guess ....

But eventually I did.... I put two 21" in a 60x60x112 cm H.baffle.
(and I have eight of those)
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