Hey X. I did add some bracing during my initial glueup of the boxes. I’m sure that helped some. What seems to help more is my experiment with BSC and a small notch filter to ever so slightly knock down the highs. Here’s my XSim showing a single driver in Red and the dual 3fe25’s in the Blue trace. And then I put it into real components. The sound is fantastic. The foam core sound has diminished from what I can hear. I think it may have been accentuated by the FR imbalance before BSC. My only question is regarding the impedance shown in XSim after my adjustments. Should I be concerned about the huge spike in the high frequency impedance or does this just make the amp work a little less? Also, is there an associated phase shift?
Attachments
That looks great Jwjarch! You can flatten the impedance peak with a cap and resistor in series and this is then strapped across the driver +/- . Try 2.2uF and 10R and go from there. There is a formula for calculating the exact frequency and that might be good to look up.
Are any of the curves from measurements or just factory data?
Are any of the curves from measurements or just factory data?
You don't say if it's for foam core or plywood/MDF construction.
Here is a plan for 12mm wood:
www.diyaudio.com/forums/attac...onator-053-pdf
Glad to see you're jumping on the bandwagon of the dual 3FE25, JPS! Here's a link to the foam core plans I used from Muddjester.
Mini Karlsonator (0.53X) with Dual TC9FD's
The holes for the drivers are a little low on the front plate. I think I moved them up about 1 cm so the magnet from the lower driver doesn't hit the bottom of the enclosure.
Good luck with your build!
Mini Karlsonator (0.53X) with Dual TC9FD's
The holes for the drivers are a little low on the front plate. I think I moved them up about 1 cm so the magnet from the lower driver doesn't hit the bottom of the enclosure.
Good luck with your build!
What kind of error are you referring to? As jwjarch suggested, move the drivers up if they touch the bottom.
What material then? Solid wood? Please note that when building out of something other thanfoam core, extensive internal foam (melamine reticulated - aka miracle cleaning pads/BASF Basotect) padding needs to be applied to surfaces adjacent to back of drivers and on front chamber side walls and foam core and felt on front aperture on the inside. The foam core box sounds excellent actually and is a nice "kitchen table" project with a child. About 4hrs each should be enbough time or two nights in the kitchen or shop.
Melamine pads are on eBay from China for $7 to $10 a bag of 100 shipping included.
Has anyone had a go at building a dual 3fe22 MK with a shallow depth for wall mounting? Assuming that I preserve the proportions and volume, could the design be "stretched" vertically? If so, I'm assuming the front aperture slot would need to remain the same proportion in relation to the drivers.
Dumb idea?
Dumb idea?
Hi Freddy,
my brother has two of those Fanes and he struggles to get any meaningful bass out of them.
Do you care to share the Karlson plans for this speaker?
Klaus
You don't get more bass by adding the same driver.
You get more output of what is already there.
If you want more bass, you'll need a different driver or EQ.