Helios
Dipole Speaker System
Three way
Tri-amped
Electrical EQ/XO
Line Level Passive RC/CR
6db Ladder Networks
NO Power Side Components
Between Amps & Drivers
12 Drivers
2 15"
4 8"
4 1" domes
6 Cables
2 con 12ga O free
6 Amps
2 ART SLA 1
1 ART SLA 2
10 Capacitors
2 for Bass EQ/XO,
8 for Mid & Tweet HP
6 Resistors
2 for Bass EQ/XO
4 for mid/tweet HP
Midrange & Tweeter Column {MT}
Wood: 19 mm 13 ply Baltic
60" high x 9.25" square
Tweeters
Front & Rear
@ 55-3/8" Seas H-1149
Midranges
Front & Rear
@ 48" Seas H-511
(Ceiling Height)/2
Bass Cube {BC}
19.75" Cube;
14" cutouts
front & back
Woofers 15" Acoustic Elegance IB-15
Front & Rear
Fs = 17~
Qts = 0.55
Xmax = 15.5 mm
Signal Chain
Source :
CD > Mixer-in
Headphone-Out >
EQ/XO_Nets >
Amps >
copper > Drivers
No Power Side Components
between Amps & Drivers.
All Drivers Damped
at All Frequencies.
Passive Line Level networks EQ / XO Circuit
Tweeter High Pass:
> 18 db/oct @ ~ 3 kc
( feed from Mid HP )
Midrange High Pass:
12 db/oct @~ 145~
Bass Dipole EQ/XO:
6 db/oct Low Pass @ 16~
[Low Pass -3db @ 16~,
-6db/oct to Fdt
{Frequency of dipole transit} of BC
This generates a
+6db slope
{down freq from Fdt(bc)}
to flatten
the -6db acoustic dipole slope of the Bass Cube from Fdt(bc) down.
Bass high rolloff starts -6db electrical begining @ Fdt(bc)~=140~
Midrange low rolloff starts -6db acoustical begining @ Fdt(mt)~=280~
Mid to Tweet
XO ~= 3 kc
Bass to Mid
XO ~= 210~