Hey,
I am building a fully active / DSP controlled system, the midrange uses a line array of 6 dedicated mid drivers.
To achieve my target performance each driver models best in a 10 litre sealed box, so far so good!
My question is regarding the cabinet loading of the drivers... What are the pros and cons of 6 individual sealed chambers Vs all 6 drivers sharing one sealed chamber of 60 litres?
Please ignore the better cabinet rigidity using 6 sealed chambers Vs one large box and the corresponding savings in labour and materials.
Thanks in advance!
Alex.
I am building a fully active / DSP controlled system, the midrange uses a line array of 6 dedicated mid drivers.
To achieve my target performance each driver models best in a 10 litre sealed box, so far so good!
My question is regarding the cabinet loading of the drivers... What are the pros and cons of 6 individual sealed chambers Vs all 6 drivers sharing one sealed chamber of 60 litres?
Please ignore the better cabinet rigidity using 6 sealed chambers Vs one large box and the corresponding savings in labour and materials.
Thanks in advance!
Alex.
The only thing could see is that the single enclosure could have some quarter or half-wave modes which might complicate things, but i would look at it as an opportunity to construct in such a manner that the larger volume would be less “constrained”
dave
dave
Thanks Dave,
To keep external dimensions matching the bass/low mid cabinet the total internal volume of the midrange is 85 litres, so I can build the internals like a mini anechoic chamber with different lengths of foam wedges on the sides, "Toblerone" shaped foam in the corners to reduce the cabinet volume down to 60 litres. I will also use various Twaron/sheeps wool type absorbent material lightly stuffed inside a cotton bag in the centre of the cabinet.
I have several sheets of 40mm thick stranded bamboo, so the cabinet will be inherently very solid and hopefully not prone to resonance in the 300Hz to 2KHz pass band the mids cover.
To keep external dimensions matching the bass/low mid cabinet the total internal volume of the midrange is 85 litres, so I can build the internals like a mini anechoic chamber with different lengths of foam wedges on the sides, "Toblerone" shaped foam in the corners to reduce the cabinet volume down to 60 litres. I will also use various Twaron/sheeps wool type absorbent material lightly stuffed inside a cotton bag in the centre of the cabinet.
I have several sheets of 40mm thick stranded bamboo, so the cabinet will be inherently very solid and hopefully not prone to resonance in the 300Hz to 2KHz pass band the mids cover.
Hmm, so you're saying that after significant break-in, they all measure < +/- 10% of the mean (10 L)?
(Subwoofer example version is often easy to show this, so I grabbed it ) but Pick one, and dont get stuck in between either and have the hiccup ?? my video of the transition won’t point here but i often worry about this with many drivers in series in a long floor stander it even ‘TL’ from the closed end to the ‘~1/3’ (pi/9 essentially) sweet spot @ the first notch/cancel
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Thanks Booger,
The drivers are 16 Ohm each, so I propose to wire them in two groups of so 3 in parallel = 5.33 Ohm, then wire the two 5.33 Ohm loads in series for a 10.66 Ohm load. I assume that this would present the amplifier with a similar load to a "conventional" MTM design with two 5.33 drivers wired in series?
The drivers are 16 Ohm each, so I propose to wire them in two groups of so 3 in parallel = 5.33 Ohm, then wire the two 5.33 Ohm loads in series for a 10.66 Ohm load. I assume that this would present the amplifier with a similar load to a "conventional" MTM design with two 5.33 drivers wired in series?
Having the individual drivers spaced along the length would cancel the length mode. If the whole box was similar to just 6 cubes stacked then the modal situation will be no different to individual boxes.
This answers my question too hydro^^
thx Allen! 👍🏼
so load up the first ‘1/3‘ of any TL and the response would look like?(ignore the distance from exit/vent to front out put in non offset TL version So it’s still got the 86.4 hz notch…). I shoulda drew it single fold to help show that
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