Gradient Speakers?

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#2
Whoa, hold your horses...

This is not the same company as the finnish one, making dipoles.

The finns are called "Gradient Labs."

This one (the drivers) has a domain registered to Intertechnik Gmbh. I have a strong suspicion, the drivers are made in Asia.

Johan-Kr
 
#5
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#6
Gradient is the speaker driver brand of intertechnick in Germany, the makers of Audin Capacitors which are well regarded in the DIY world and used in many comercial speaker brands. They are most probably made in asia and the quality appears to be nice!
 
#7
this "WLCM10" code will save %10 off the retail price - at least when buying in the US. With the fairly high published qts and Vas, I wonder what cabinets will work the best? (I don't have a Karlsonator simulator/akabak)

~$61 gamble - ordered "one" -

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#8
I figure it will be something like BG20 in parameters (so would drop into a Karlson K12 for quick evaluation) and built like a Gui-Sound for cone profile-- low inductance (0.18mH) reasonably low K2 and K3 - sturdy looking frame

since a Karlson typically tilts a driver 20 to 30 degrees back, and the varying aperture spreads relevant wavelengths,
I don't think the correction network for direct radiator purposes will be needed.


dimensions including cutout
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2nd vs 3rd harmonic distortion
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FR on-axis & acoustic phase
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#9
WoW ! - this AX08 is certainly an impressive, beautiful looking and solid feeling driver - quite compliant - pretty aluminum phase plug, thick U beam frame spokes, large spider. It should have to sound at least as good as my AN8 (?) The curvilinear cone is light with no rear treatment so could respond to diy treatments. In contrast, W8-1772 has a lot of extra pulp on the rear of its cone for damping. Tang's 2145 looks even more damped with its fancy surround.
 
#11
I haven't had enough rest to play with the speaker yet - but found one user's recommendation as to frequency shaping via FOOBAR and a 32 band EQ plug-in

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the LC notch filter and impedance equalizer shown in das Viech - AX08 article did not publish values - guess its a "kit"
 
#13
no break-in whatsoever - a couple of impedance plots in a Druid style pipe (originally for my old-spec Eminence B102)


AX08 impedance, no filter, in the pipe - fs without break-in must
be around 60Hz
lvyfDjR.gif


Frequency centers of 1uF and 3.3uF in parallel with 0.8mH and in series with AX08 - no "R" - just looking for something laying around to contour the mids
4WMzGEM.gif
 
#14
with ~1/2 ohm series resistance of long wire and ~0.4ohm dcr coil, a crude BSC filter of 0.8mH/8R is too much. It sounds pretty good with no filter and better imo with a rough cardboard BBC slot filter - the recording I'm using is an obscure but good recording of a young lady singing old Christmas carols and simultaneously playing harp. A bare 8" driver doesn't sound right to me and some truncation of its horizontal width seems to help with reducing subjective localization of the speaker. This is a nice little fullrange.

I've had the CD for some years and use it to evaluate - its listed at CD Baby
http://www.cdbaby.com/cd/madisonsings
 
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#15
Here's a quick In-room plot with no electrical filter, and driven by my Crown amp - imo its quite extended on the top and
better than level out to 18KHz on-axis.

perhaps some of the readers can suggest a mild contour network to slightly curb the rising response - the cabinet's maybe not optimum but usable and I like the driver height for standing/listening - a bit more damping material and it should be ok.

Imo, this is pretty good for 1/24 octave resolution

Z9z7gRh.gif


here's the same pipe, different room - maybe a bit more mic distance with FE206EN and
the old rotting surround BOFU - that would have been a great speaker with a longer lasting surround

1/12 octave smoothed
A38JVbE.gif
 
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#17
I'd imagine a "FAST" setup on open baffle such as these pictures from MiniDSP's site would be nearly ideal

qts with mild break-in is around 0.64, and fs ~43Hz.

Goldwood's GW1858 comes to mind for the helper woofer

FF2015_OB-01.jpg

FF2015_OB-02.jpg
 
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