Some outdoor measurements of the 12-250tc I made with REW, you will need a copy of REW then just open the file with it and you can play with the data until your hearts content.
Loudspeaker on a 14 inch square ish baffle, approx 5' off the ground on a tripod, Earthworks M30 mic approx 1m away, boundaries approx 5M.
'no f = no foam'
Outside 5inch1x30mm1x20mm1meterdist.mdat - Google Drive
Loudspeaker on a 14 inch square ish baffle, approx 5' off the ground on a tripod, Earthworks M30 mic approx 1m away, boundaries approx 5M.
'no f = no foam'
Outside 5inch1x30mm1x20mm1meterdist.mdat - Google Drive
I made a thread: Interest Check - Custom Fane 15 Full-Range
Might be of interest.
I've also pinged a few contacts and suppliers in the PA world to drum up interest. It'd be really cool if we could get this off the ground.
Chris
Yes, absolutely. That's why I'm often posting about the value of heterogeneity. You gotta think statistically esp about subs.
There are million "imperfections" that our ears know how to ignore. I better end the post before I start ranting about getting Carnegie Hall into your living room.
B.
Adason: Here's what I think might be 0-15-25-35 degrees measurements.
Again, this is in-room, noise floor is ca 36db, and there might have been stuff rattlin'. I was wearing ear protection so couldn't tell.
And this is just the FC152 going solo btw.
Again, this is in-room, noise floor is ca 36db, and there might have been stuff rattlin'. I was wearing ear protection so couldn't tell.
And this is just the FC152 going solo btw.
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Just a quick note to say I've got a pair of these on their way. It might be a little while before I get around to them, but once I do I have the following plans:
- Passive correction network
- Experiment with magnets to get Qts down
The aim is to try and get them suitable for compact stage monitor or PA use - 30-40L box, tuned around 70Hz.
Freddi, those sealed box sims look pretty good!
I'll have a closer look if the magnets trick doesn't work out.
Chris
- Passive correction network
- Experiment with magnets to get Qts down
The aim is to try and get them suitable for compact stage monitor or PA use - 30-40L box, tuned around 70Hz.
Freddi, those sealed box sims look pretty good!
I'll have a closer look if the magnets trick doesn't work out.
Chris
Now in a 92 liters box (55x55x30).
Very disappointing at the begining, serious lack of low end, even with a vent.. until I added rockwool on the back face. Something were self-cancelling
Two measures on-axis at about 40cm, one with "contour" (from Rotel RC-1070 preamp).
Do you know what is the cause of the dip in the 450-750Hz region? it was near the same with a 145 liters box.. but not when OB.
Thinking of build big boxes this time but with a limited depth.
Something like 30cm D x 55cm W x 125cm H.
Is there a problem with a small depth?
Very disappointing at the begining, serious lack of low end, even with a vent.. until I added rockwool on the back face. Something were self-cancelling
Two measures on-axis at about 40cm, one with "contour" (from Rotel RC-1070 preamp).
Do you know what is the cause of the dip in the 450-750Hz region? it was near the same with a 145 liters box.. but not when OB.
Thinking of build big boxes this time but with a limited depth.
Something like 30cm D x 55cm W x 125cm H.
Is there a problem with a small depth?
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How much rock wool did you add?
Did you try moving the speaker 30cm in one direction and measuring again?
Are the dips the same?
I don't like thin enclosures, especially for woofers. The energy that is bounced back can be very detrimental to the sound.
There's also no way to see anything with the scale of your impulse graph.
Try to limit the time to something like 30ms.
Did you try moving the speaker 30cm in one direction and measuring again?
Are the dips the same?
I don't like thin enclosures, especially for woofers. The energy that is bounced back can be very detrimental to the sound.
There's also no way to see anything with the scale of your impulse graph.
Try to limit the time to something like 30ms.
Let's see... 573.3Hz
345m/s, divided by 573.3 = 0.60 meter, of which half a wavelength is 0.3 meters. So that correlates with the depth of your box. But I see your box is also 0.55 high and close to the ground, which will also cause a cancellation at the same frequency. It appears to be an unlucky combination of dimensions. You might be able to fix it rather quickly by raising it substantially off the ground and putting more damping material in your enclosure. But too much sounds less good, so maybe you could place some diffusors inside the box.
345m/s, divided by 573.3 = 0.60 meter, of which half a wavelength is 0.3 meters. So that correlates with the depth of your box. But I see your box is also 0.55 high and close to the ground, which will also cause a cancellation at the same frequency. It appears to be an unlucky combination of dimensions. You might be able to fix it rather quickly by raising it substantially off the ground and putting more damping material in your enclosure. But too much sounds less good, so maybe you could place some diffusors inside the box.
There.
Diffusers and a bit more rock wool, I would also do at least one side wall.
Another thing. I don't know if other users of the Fane can correlate the impulse you got. There's a lot of action happening in the first ms, then slowly quieting down 2ms later.
Maybe you still have the impulse from when you had yours on OB. Do they still look that ragged in the first couple ms?
Diffusers and a bit more rock wool, I would also do at least one side wall.
Another thing. I don't know if other users of the Fane can correlate the impulse you got. There's a lot of action happening in the first ms, then slowly quieting down 2ms later.
Maybe you still have the impulse from when you had yours on OB. Do they still look that ragged in the first couple ms?
Thank you both.
Tomorrow I'll add some rock wool (this time where speaker is mounted on?) and also on one side, and raise them from the ground.
Yes, see attachements, it doesn't look very good too
The measurement was done last year, if I remember correctly it was a basic OB 2 meters high, 60cm wide, speaker centered at 1 meter but NOT centered wide.
Mic at about 2 meters more or less on axis (by hand).
Tomorrow I'll add some rock wool (this time where speaker is mounted on?) and also on one side, and raise them from the ground.
Yes, see attachements, it doesn't look very good too
The measurement was done last year, if I remember correctly it was a basic OB 2 meters high, 60cm wide, speaker centered at 1 meter but NOT centered wide.
Mic at about 2 meters more or less on axis (by hand).
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It would be nice if we can get others using the Fane 15 to post their impulse as well. Might tell us a bit more about your box.
But, yes, I would add some more rock wool, and one or two sides as well. Or a side and the "roof".
Moving them off the floor would be a good idea too.
Then, measure again and see if it helps.
I have a pair Taiwan made 15" full rangers that also work reasonably well. Mine are on OB, and here's the impulse I have.
But, yes, I would add some more rock wool, and one or two sides as well. Or a side and the "roof".
Moving them off the floor would be a good idea too.
Then, measure again and see if it helps.
I have a pair Taiwan made 15" full rangers that also work reasonably well. Mine are on OB, and here's the impulse I have.
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Which driver is it?
Just some very light paint on the wizzer and "chrome" trim on the outside
This morning I added some rockwool on "roof", one side and a bit more in front of the magnet.
One measure on axis at about 40cm, another off axis (mic to the right, 30 cm from center).
Speakers not raised yet from the ground., I'll try later.
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Which driver is it?
Locally made driver. Factory is in Taichung. They used to be bigger, but now most of the factories relocated to China. Very few left, including this company and another famous Taiwanese company, Usher.
Nothing much in terms of new tech into these speakers. They just continue to produce some with their old ways. Still ok and the ratio of quality vs price is very good, these drivers cost $84 each.
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Just a quick follow-up on this.
Around 25x neo rod magnets (20mm long, 5mm diameter) and a large jubilee clip to hold them all to the magnet resulted in the Qts moving from 0.925 to 0.876.
I did get some steel bar to try adding, which would join the neo magnets to the top/back plates of the driver, but it doesn't look like there's much point in persuing that further. At least, not with the magnets I have at the moment.
Chris