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Recommend driver for 1.16 ft^3 box
Recommend driver for 1.16 ft^3 box
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Old 21st June 2018, 05:49 PM   #51
vdi_nenna is offline vdi_nenna  United States
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Bass-reflex...
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Old 21st June 2018, 08:33 PM   #52
45 is offline 45  Italy
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Quote:
Originally Posted by planet10 View Post
If you want to stick with paper the 5.25” A10p. It goes lower, higher and edges the larger driver in midrange, and is almost as efficient. More versatile as to box size (the A12p seems to really want a big box) and cheaper to boot. The 6.5” A12p edges it out only in how much air the larger cone can move.

dave
My first experiments look promising with A10p. Published parameters seem to be spot-on.
I have made a first experiment in sealed box of 28l (effective) and I like so much that I think I will stick to this. The volume is perfect. This gives a total Q of about 0.71 once the Zout of ITS amp of 3.75R is taken into account. F3 around 60Hz and then the usual 12 dB roll-off of sealed box, actually a bit less than 12 in practice. F10, should be around 35Hz. About 87 dB/1W average efficiency and very balanced presentation. Nothing in the way between amp and driver thanks to the "built in" BS compensation. Pretty impressive for such a small driver!
Given the radiant surface and the linear excursion I think it would useless to ask lower for F3. In that case a transmission line might be the choice but I wanted a book-shelf loudspeaker. Now I need to work on the shape to eliminate diffraction and other un-wanted stuff that spoil resolution and cause troubles....
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Old 11th July 2018, 03:08 PM   #53
vdi_nenna is offline vdi_nenna  United States
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Here's what I came up with on gut instinct. Didn't use any software to design. It's slapped together. Right now it's breaking-in. Has 16 hours so far with break-in track and music.

On first start up, it was harsh, no bass, shouty and irritating. It did have great dynamics, but that could have been due to the peaks in the upper mids and over all shouty character. Has good 3d presentation. There's no lack of extension. Bit of a directivity issue, but not terrible.

After 16 hours- more bass was present, especially in bass heavy tracks. Tight, but not chest pounding. Was less shouty, still emphasis in upper mids. Does benefit from front wall re-enforcement. Likes space on outside of speakers, away from boundaries.

It's just a FR in an aperiodic box 1.16Ft^3 filled with 50% loose poly and corrugated stuffing behind the driver. Path from rear of driver to the aperiodic port is clear. Box is completely glued together, my first time using only glue. Used Tite Bond II. Internal wiring is QED ~16 ga, maybe even 18 ga, not sure. Wire has a foam jacket. Used heavy duty binding posts, which I don't like, but it's what I had on hand.
No filters yet.

I think the 89+ db sensitivity is pretty much spot on. I recently picked up a pair of Sonus Faber Grand Piano towers at 90db and they have the same amount of output in the same space.
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Old 13th July 2018, 06:43 PM   #54
vdi_nenna is offline vdi_nenna  United States
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Switched up power amps to a simulated F7. The F7 has much greater control over the drivers. More break-in time and the F7 has improved the sound greatly.
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Old 13th July 2018, 09:57 PM   #55
zman01 is offline zman01  Bangladesh
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Recommend driver for 1.16 ft^3 box
Vince,

What amp were you using with the speakers prior to the simulated F7?
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Old 14th July 2018, 01:32 AM   #56
vdi_nenna is offline vdi_nenna  United States
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Quote:
Originally Posted by zman01 View Post
Vince,

What amp were you using with the speakers prior to the simulated F7?
The big MoFo 24v 193v version, approximately 20w.

I'll put the MoFo back in after 40 or 50 hours.
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Old 14th July 2018, 08:38 AM   #57
xrk971 is online now xrk971  United States
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Recommend driver for 1.16 ft^3 box
Nice work. The size cabinet you have can easily have been a MLTL. You can still try that by stuffing polyfill in the top third and keeping it open inside for rest of space and a vent near bottom tubes for a BR - this would be using the AMLTL method.
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Old 14th July 2018, 10:24 PM   #58
vdi_nenna is offline vdi_nenna  United States
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I don't understand TLs all that much, but I'll read it over. thanks.
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