You need to get at least 100 hrs on them. Without your measures are invalid and not much use except to give you a reference point.
dave
dave
Your post #10 green curve and my post #34 green curve basically agree on driver (semi-) nude without baffle reinforcement. I simply broad-notched the HF shelf flat. You might either place it on top of the cab baffle-less (except below driver), or co-axially over the woofer cone and possibly get a ~1khz in-phase bounce of the backwave (17cm halfwave travel). Or try AllenB post #30 baffle placement (driver center ~17cm to right-edge; maybe top too). And there are other things to try on the baffle/backwave.
p.s. flip cab, Eazy on new top
p.s. flip cab, Eazy on new top
Last edited:
Didn't like opamp 2.1 sound so went back to tweaking passive. Only had time to do one channel (and only one $30 vintage 12" oh well) but it's about as "high fidelity" as I've yet managed 2+ years into diy. Well almost, 8khz still a little bit over.
The bits are my hoarded Jantzen: 2.7uF Silver || 1.5mH copper-foil || 6ohm notch-filter before 1ohm before Eazy; 9mH air-core (1.85ohm) LPF before the woofer.
The bits are my hoarded Jantzen: 2.7uF Silver || 1.5mH copper-foil || 6ohm notch-filter before 1ohm before Eazy; 9mH air-core (1.85ohm) LPF before the woofer.
Attachments
My measurements are bad due to poor speaker placement… dont look under 200hz
heres a few xo points
250hz, 800hz and 1200hz
as we can see, the 900hz dip is bad
i can only make this speaker work with a min 800hz xo
the pics with the yellow line is the 250hz xo. Look at that dip!
so yeah, the fe108ez… i would only use it in a 800hz min xo points. Id need a more efficient woofer to make the sound balanced as its too efficient for the 12br70. Back to the shelf!
heres a few xo points
250hz, 800hz and 1200hz
as we can see, the 900hz dip is bad
i can only make this speaker work with a min 800hz xo
the pics with the yellow line is the 250hz xo. Look at that dip!
so yeah, the fe108ez… i would only use it in a 800hz min xo points. Id need a more efficient woofer to make the sound balanced as its too efficient for the 12br70. Back to the shelf!
Attachments
Last edited:
the balance just works. sounds is impressive to me with the xo set at 800hz.wow.
now im happy
the fe108ez is quite a bit more efficient .a better match would be a 96db woofer
gotta go buy some caps and coils to try a 500hz xo points for the 105WK
Ive tried 250hz xo and it didnt work as i had a dip in the lower mids.
now im happy
the fe108ez is quite a bit more efficient .a better match would be a 96db woofer
gotta go buy some caps and coils to try a 500hz xo points for the 105WK
Ive tried 250hz xo and it didnt work as i had a dip in the lower mids.
FF105wk is flatter than the FE108e∑ out of the box. Do note that teh crease in the dustcap should be oriented vertically. You need to rotate the 105 45°.
dave
dave
pair is done
first order xo around 400hz.
less efficient that I hoped for: circa 91db. My BIG REF 150L is way more efficient at 95db
I can confirm the 12br70 doesnt work perfectly in a 30L cabinet
I get a high shelf from 80hz up to 200hz. I dont mind the +-5db boost down there however
how do they sound? the 12'' sealead bass is extremely tight, with a satisfying amount of punch and kick. mid and treble is surprinsgly linear with great amount of details.
first order xo around 400hz.
less efficient that I hoped for: circa 91db. My BIG REF 150L is way more efficient at 95db
I can confirm the 12br70 doesnt work perfectly in a 30L cabinet
I get a high shelf from 80hz up to 200hz. I dont mind the +-5db boost down there however
how do they sound? the 12'' sealead bass is extremely tight, with a satisfying amount of punch and kick. mid and treble is surprinsgly linear with great amount of details.
Last edited:
on axis, definitely. off axis helps a lot. the peak is audible though and I hope i can somehow make it less so
for the cost of about 700$, they are laughably insane sounding. I think im starting to become addicted to designing speakers. ive been living with a big 3 way for a year now, and going back to a 2 way is interesting. I need to design a proper BIG 2 way.
after a few minutes of acclimatation, im quite surprised by the overall sound. Bass is good. mid is good. treble is ok, the peak is bad.
C37 is not the right direction to take, it is too easy to overdo it.
It applies more smoothly than puzzlekiat but is no more effective, does not allow for colour change and costs 100s(?) of times as much.
dave
It applies more smoothly than puzzlekiat but is no more effective, does not allow for colour change and costs 100s(?) of times as much.
dave