I bought 4 pieces of 16 ohm 6FE200's from France.....haven't received them yet but I think they were 28 euro each...couldn't help myself.....that'll be the next project.....
So back to this one.....
I have 4 4FE32's and a pair of 4FE35's.....
The high Q of the 4FE35 results in a 2db bump in the low frequency but has a much lower f3 when modeled as OB in winISD..as expected I suppose.....
I've been listening to both the 4FE32's and the 4FE35's in parallel (one baffle has a pair of 4FE32's wired in parallel and the other a pair of 4FE35's in parallel)...and they sound quite good as they are....I put a zobel on the 4FE32's....
Then I threw together a 2nd order LR at 4500hz and tried that on both setups..I wasn't impressed at all...not sure why but triple checked everything. I also noticed the high freg response dip when moving vertically..really obvious.
I have a crossover box thingy..so I pulled that out and tried second order 5500hz BW and bessel...both of those sounded quite good, and the high freq response seemed a lot more constant when moving vertically; this seems counter intuitive.....
..and as of yesterday I've been playing with a miniDSP........this thing is highly entertaining.....tried a number of tweaks with more to come....
So back to this one.....
I have 4 4FE32's and a pair of 4FE35's.....
The high Q of the 4FE35 results in a 2db bump in the low frequency but has a much lower f3 when modeled as OB in winISD..as expected I suppose.....
I've been listening to both the 4FE32's and the 4FE35's in parallel (one baffle has a pair of 4FE32's wired in parallel and the other a pair of 4FE35's in parallel)...and they sound quite good as they are....I put a zobel on the 4FE32's....
Then I threw together a 2nd order LR at 4500hz and tried that on both setups..I wasn't impressed at all...not sure why but triple checked everything. I also noticed the high freg response dip when moving vertically..really obvious.
I have a crossover box thingy..so I pulled that out and tried second order 5500hz BW and bessel...both of those sounded quite good, and the high freq response seemed a lot more constant when moving vertically; this seems counter intuitive.....
..and as of yesterday I've been playing with a miniDSP........this thing is highly entertaining.....tried a number of tweaks with more to come....
..so I've been busy.....playing with this setup and a mini-DSP......
..and I'm a bit puzzled....
So I've tried TMM open baffle in the picture above with both the 4FE32-16's and 4FE35's and the Neo CD 3.0.
Both of the above worked quite well crossed over around 4500-5000hz with 24 to 48db LR filters using the mini DSP; they each required some attenuation of the tweeter when using 2 midbass drivers.......which brings me to my first question...
If two parallel 16 ohm 4FE32's or 4FE35's provide 91db+6db =97db sensitivity and the NeoCD 3.0 is 93 db why do I need to attenuate the tweeter? Baffle step losses?
I bought two additional 4FE35's and routed an additional hole in the baffles to run TMMM and that had reasonably flat response (not tilted up at high freqs) without any tweeter attenuation. The 4FE35's-16's are all wired in parallel yielding 5.33 ohms nominal impedance.
The other thing puzzling me is that according to the spec sheet and some suggested sealed alignments on Parts Express the f3 freq for these drivers should be around 100 hz or so; when I run REW with the miniDSP I'm seeing an f3 more like 180hz.....not sure why.
The High Qts(1.18) of the 4FE35 shows at least a 2db bump in the bass response with a huge cabinet (approaching open baffle) in winISD. I'm not seeing anything even remotely close to a bump in the bass response.
To further investigate this I purposely enclosed one of the TMMM speakers with an undersized enclosure expecting to see at least a 2-3 db bass bump.....but I'm not seeing one there either.
I can post screen shots of the REW testing. I'm using the miniDSP UMIK about 2 feet in front of the enclosure....in a fairly large live listening room.
..and I'm a bit puzzled....
So I've tried TMM open baffle in the picture above with both the 4FE32-16's and 4FE35's and the Neo CD 3.0.
Both of the above worked quite well crossed over around 4500-5000hz with 24 to 48db LR filters using the mini DSP; they each required some attenuation of the tweeter when using 2 midbass drivers.......which brings me to my first question...
If two parallel 16 ohm 4FE32's or 4FE35's provide 91db+6db =97db sensitivity and the NeoCD 3.0 is 93 db why do I need to attenuate the tweeter? Baffle step losses?
I bought two additional 4FE35's and routed an additional hole in the baffles to run TMMM and that had reasonably flat response (not tilted up at high freqs) without any tweeter attenuation. The 4FE35's-16's are all wired in parallel yielding 5.33 ohms nominal impedance.
The other thing puzzling me is that according to the spec sheet and some suggested sealed alignments on Parts Express the f3 freq for these drivers should be around 100 hz or so; when I run REW with the miniDSP I'm seeing an f3 more like 180hz.....not sure why.
The High Qts(1.18) of the 4FE35 shows at least a 2db bump in the bass response with a huge cabinet (approaching open baffle) in winISD. I'm not seeing anything even remotely close to a bump in the bass response.
To further investigate this I purposely enclosed one of the TMMM speakers with an undersized enclosure expecting to see at least a 2-3 db bass bump.....but I'm not seeing one there either.
I can post screen shots of the REW testing. I'm using the miniDSP UMIK about 2 feet in front of the enclosure....in a fairly large live listening room.
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Quoting myself here..lol....
After swapping various amps in and out using the miniDSP...I've noticed a little thing called amplifier gain.....that likely explains the issue above.....
I have a multichannel 60W amp......that should be a good test since all the channels have the same gain.
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So I've built these speakers three years ago and have been happily listening to them...........so I figured I should post an update.....
A pair of 16 ohm 6FE200's wired in parallel and a neo CD 3.0 with an open back stuffed with some polyfill.
I'm using a basic MiniDSP 2x4 and crossing them at 5000hz 4th order L-R.......and they image and sound great, better than anything else I've had. I've been playing with other slopes and freqs and I'm now thinking about putting a baffle step comp circuit on the lower driver with the thought that perhaps it could image even better..if that's possible.
I've started playing with rolling off the 6FE200's on the bottom at 200hz/12db since I'm running a sub as well.
As expected, the vertical off axis response is very noticeable; when you stand up the imaging/phantom center is pretty much gone.......I've tried other crossover freqs and slopes but I'm not noticing much difference here.
So I'm open to suggestions to other things to try to get these to sound even better, but again I'm quite pleased with them the way they are.
A pair of 16 ohm 6FE200's wired in parallel and a neo CD 3.0 with an open back stuffed with some polyfill.
I'm using a basic MiniDSP 2x4 and crossing them at 5000hz 4th order L-R.......and they image and sound great, better than anything else I've had. I've been playing with other slopes and freqs and I'm now thinking about putting a baffle step comp circuit on the lower driver with the thought that perhaps it could image even better..if that's possible.
I've started playing with rolling off the 6FE200's on the bottom at 200hz/12db since I'm running a sub as well.
As expected, the vertical off axis response is very noticeable; when you stand up the imaging/phantom center is pretty much gone.......I've tried other crossover freqs and slopes but I'm not noticing much difference here.
So I'm open to suggestions to other things to try to get these to sound even better, but again I'm quite pleased with them the way they are.
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