Start your array of 16 drivers per channel as close to the floor as possible and you probably will reach that goal of 50 Hz, depending on the room maybe a bit lower. Use the back wall (placement of the array reasonably close to the wall). A corner would help even more. What are you going to do with the top end? We still don't know how the top end performs from this variant of the Vifa.
I'd still recommend running a sim in winISD or similar to get a feel for what's going on.
I'd still recommend running a sim in winISD or similar to get a feel for what's going on.
top end is upto 10khz. 'linuxguru' has built speakers. i shall add a super tweeter later. may be i will cross at 5khz or so. center-to-center spacing between mid and tweeter will not be sufficient i guess. i will have to look out for a pretty small tweeter in that case
Dayton Audio - ND20FA-6 3/4" Neodymium Dome Tweeter 6 Ohm
this could work provided its a good tweeter
this could work provided its a good tweeter
that shouldn't be a problem. will keep in mind.
except cymbals, violin and couple of other instruments, almost no other instruments crosses 10khz mark. so initially i should be fine without tweeter. but to add that sweet airiness... i will add an array of small tweeters.
for 3.5" driver the overall length of line array would become more than 56" (3.5 x 16) nearly 5 feet. handling/moving etc would become bit tedious job....so....will it make sense to build four boxes each having four drivers and stack the boxes on top of each other? i will figure out something to hold the boxes together firmly.
Makes a lot of sense. The drivers at the transition from one to the other should be as close as possible.
dave
Whether a tweeter will be required for a line array with the Tymphanys is probably going to be a matter of subjective opinion - the Tymphany rolls off above 10.5 kHz, so it probably won't hurt to have a small helper tweeter crossed high, maybe 10 kHz.
One possible candidate for such a tweeter is the 0.75" Aiwa 8A-CJ5-417-01 fabric dome (google shows the 8ACJ5417010 as discontinued with an alternate part #, it must be the same tweeter), which I've used earlier in another project and found the sound pleasing. I may also use the same tweeter if needed in the dual-driver Tabaq with Tymphanys. It has relatively low power handling and no fluid damping/cooling, but this should not be an issue at low/moderate power levels.
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winisd sim for 16 drivers in line array
made some sim in winisd (alpha version)
for a box of suggested 49 liters i am getting below transfer function
on applying linkwitz transform and parametric EQ and HP filter at 40hz to limit cone excursion to less than 2mm, below is the graph,
am i going in the right direction?
made some sim in winisd (alpha version)
for a box of suggested 49 liters i am getting below transfer function
on applying linkwitz transform and parametric EQ and HP filter at 40hz to limit cone excursion to less than 2mm, below is the graph,
am i going in the right direction?
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That's a good exercise to know the limits. But you'll have to measure the arrays at the listening position to apply the PEQ/Linkwitz transform. Depending on position in the room you might get different results than this sim.
Here's an idea that I'm just documenting in case I forget it. There are wall-mounting rails with slots that are available in kitchen-shelving and supply stores. Normally, the slots are used for suspending shelves as shown in the picture below. However, it's fine for holding anything, including little L-brackets that can be mounted on the rear of the 4-driver boxes mentioned above, and slung into the slots on the rails shown. With some care in measurement and mounting, a pair of parallel slotted rails should be adequate for mounting a floor-to-ceiling array of 4-driver boxes. An additional plus is that fine-tuning of driver offsets from the floor is just a matter of moving each cabinet to an adjacent slot.
Edit: When the location of each box is finalized, a small amount of blu-tac/plasticine/putty may be placed if needed in each hook/slot to damp-out any vibrations.
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