Drivers measured straight out of the box:
Not very consistent, but not out of the ordinary either.
Attached is the FR measurement in a sealed 240mm cubed enclosure (13.82 litres) using Driver A. The FR is quite well behaved and extends to 4k before a smooth drop off. I've also shown the modelled response based on the measured T/S to compare.
The drivers are being run-in now and I will measure again after a couple of days.
Code:
Fs VAS Qts Qms Qes Re Sd
Driver A 54.9 13.28 0.442 3.827 0.499 3.2 131.8
Driver B 45.2 17.68 0.393 3.566 0.441 3.2 131.8Not very consistent, but not out of the ordinary either.
Attached is the FR measurement in a sealed 240mm cubed enclosure (13.82 litres) using Driver A. The FR is quite well behaved and extends to 4k before a smooth drop off. I've also shown the modelled response based on the measured T/S to compare.
The drivers are being run-in now and I will measure again after a couple of days.
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Hi Vikash,
Great work! It's nice to see such an ideal frequency response. I'll have to try them as mid/basses in a 2-way or 2.5-way speaker project.
Your table is puzzling because of the offset headings
But from memory I think your FS (on one of them at least), VAS and QTS are actually not too far from what I measured! This is splendid because I obviously didn't put too much faith in my first speaker measurements.
Great work! It's nice to see such an ideal frequency response. I'll have to try them as mid/basses in a 2-way or 2.5-way speaker project.
Your table is puzzling because of the offset headings
But from memory I think your FS (on one of them at least), VAS and QTS are actually not too far from what I measured! This is splendid because I obviously didn't put too much faith in my first speaker measurements.
Displays fine in FF and IESimontY said:Your table is puzzling because of the offset headings
The smooth rolloff could make for an easy tweeter integration in a 2-way. Infact I have some tweeters lying around which might work here...
FYI Unibox reckons 88.4db efficiency 1W 1m, and models well in a ported enclosure of 18 litres tuned to 56Hz. F3 of 50Hz.
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Strange, the table does indeed work in my FF, but not my IE!
Anyway... yes a 2 way would surely be easy to get a good result from.
Will running-in shift down that optimal tuning frequency and F3?
It doesn't look like my isobaric box is stupidly far off does it? Maybe just a little detuned.... (no harm in that I don't think)
Anyway... yes a 2 way would surely be easy to get a good result from.
Will running-in shift down that optimal tuning frequency and F3?
It doesn't look like my isobaric box is stupidly far off does it? Maybe just a little detuned.... (no harm in that I don't think)
There will be a slight difference after run in for sure. How much I don't know, but more importantly since the run changes compliment each other (Fs and Qts go down, VAS goes up) the modelled response is not usually that different anyway. I just like to be thorough
Also I used a cubed enclosure that was lying around to take the FR . I'm not sure how measursable the effects of standing waves are, but the FR might be smoother once run in (skeptical) and in a proper enclosure
Also I used a cubed enclosure that was lying around to take the FR . I'm not sure how measursable the effects of standing waves are, but the FR might be smoother once run in (skeptical) and in a proper enclosure
T/S after 48 hours break-in:
The drivers show little relative T/S changes between pre/post break in. Certainly less than the consistency between drivers.
Attached is the FR of both drivers (measured at the same distance!).
Code:
Description Fs VAS Qts Qms Qes Re Sd
Driver A Pre 54.9 13.28 0.442 3.827 0.499 3.2 131.8
Driver A Post 50.8 14.94 0.411 3.815 0.461 3.2 131.8
Driver B Pre 45.2 17.68 0.393 3.566 0.441 3.2 131.8
Driver B Post 43.2 19.39 0.376 3.657 0.419 3.2 131.8The drivers show little relative T/S changes between pre/post break in. Certainly less than the consistency between drivers.
Attached is the FR of both drivers (measured at the same distance!).
Attachments
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