Crossover
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Due to smooth frequency response of all drivers,
an almost as simple as can be crossover.
I had hopes for 22 uF to middriver (cost) but 30 uF is what it takes.
Go
to crossover layout
Predicted individual and summed response
of drivers driven from crossover.
Construction pics
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Cabs made from 22 mm MDF. Interior bracing panels from 12
mm Baltic birch.
Note serious chamfering of 8008 and MCA12RC holes.
Front panel made from 22 + 12 mm MDF.
Applying birch veneer to cabinet.
All interior panels damped with 10 mm felt material
except for panels behind 8008 drivers. Here we need space for mounting
crossovers; bass crossover
to one side, mid and treble crossover to the other side. On top of
crossovers a piece of folded 30 mm acoustilux is placed, 22 x 35 cm.
Pics to below.
Measurements
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Left: SPL/1 meter/2.8V. System sensitivity
= ~92 dB. Right: System impedance: 5 ohms. Overall an easy load. Note
port tuning @ ~40 Hz.
Left: Horizontal dispersion @ 0, 5, 10, 15
and 20 deg. displaying an even power response over a wide area.
Right: Vertical dispersion starting at middriver height (red) and 5, 10, 15
and 20 deg. (black) above.
All in all this speaker has an even sound distribution over a wide area,
which was a prime target of the project.
Left: Individual and summed response
of drivers driven from crossover. Right: Summed response with positive
(orange) and negative (green) polarity of middriver.
Speaker Kit
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Complete kit available from Jantzen Audio.
Mail: contact@jantzen-audio.com
Download
kit sales presentations
Crossover
Layout
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Crossover layout for Option 1 (Superior-Z
version).
Same layout can be used for Option #2, all-STANDARD-Z-cap version,
although components take up considerably less space.
If you want to spoil your drivers, use WAX coils for L2041 and L1031
(both must be 16 AWG).
Layout for all-STANDARD Z-CAP version.
Click image to view large.
Due to small size caps, it can all be on one board.
Crossover pics
The complete center crossovers.
Left: bass and tweeter crossovers. Right:
Mid crossover.
Click images to view large.
Note Audax TW034 now replaced with the better SEAS
T35C002.