AV Eikon : finished
Today i finished to make the 4 way full front horn-loaded system, after 10 month of intensive handcraft and artesanal work. The name is Audio Voice Eikon.
1. Bass: A pair of vintage 15" Vitavox AK 156 drive units, frontloaded in a basshorn with 60" horn length, entire bass section is driven by two INOSIC RAS300, german 300 Watt into 3,3 Ohm Active subwoofer modules with toroidal transformer and huge electrolytic capacitors. The module features automatic power-on, volume, phase and cut-off frequency control, subsonic frequency control as well as boost and EQ frequency control.The unit switches to energy-saving stand-by mode should after a few minutes no signal be detected. Special version with crossover up to 300hz/24db.
The cabinets of the basshorns are made of MDF, and exclusive brazilian Zebrano Veneer. It can be sand filled. Bass is very defined, transparent and fast, excellent transient response and attack, not boomy at all.
Efficiency 105dB 1W/m
Weight 300pounds each
The horns are meticulously handcrafted, in a very time consuming, artesanal way. Wall thickness is up to 6", the massive construction does avoid any kind of resonances. They are absolutly silient by themself, any kind of coloration is possible.
The frame is made of MDF, brazilian Zebrano veneer.
Weight is a massive 150 pounds.
2. Low Mid: 38" Tractrix solid MDF horn, painted with black, half matt poliurethane color , which leaves a sligthly raw surface, with the best acoustic properties, driven by a 8" Fane Studio 8M unit.
3. Midrange : 24" LeCleac'h MDF horn with the legendary 1,4" Vitavox S2 compression driver with aluminium diaphragm. The driver is directly coupled to the horn, without adapter of different material between.
4. Treble: 6" Aluminium Wave Guide with a Coral H104 Supertweeter with Alnico Magnet and a 1" aluminium diaphragm.
Efficiency 109dB 1W/m
crossover passive 150hz/1000hz/10khz / first order, oil in foil caps/mundorf coils
Dimension of the satellites:
Weight 600 pounds each
Drivers used :
treble : Coral H104
http://www.audiovoice-acoustics.com/for ... ight=coral
midrange : Vitavox S2
http://www.audiovoice-acoustics.com/for ... ht=vitavox
midbass driver : Fane Studio 8M
replaced later with Radian 950pb
http://www.audiovoice-acoustics.com/for ... light=Fane
Bassdriver : Vitavox AK154 :
subwoofer : Aura 1808 :
see the " make of " :
the basshorn :
the frame :
making the midbass horn :
the midbass horn painted :
SYSTEM DESCRIPTION :
Satelllite amplifier : Viva Solista SET 845 integrated amplifier, Shuguang M845 metal plate tubes
basshorn amplifier : Inosic plate amp RAS300
sub bass amplifier : Rythmik plate amp A300
cd player : Audionet ART VII
turntable : MicroSeiki DQX1000, Black Widow tone arm, pick-up Shure V15 mkIII,
phono pre : Ensemble phonomaster
i wrote about the first listening impressions at DIYAudio Forum :
using a L-pad for the midrange channel ( since i have only one auto trafo , which i use for the tweeter )
changed the common 845 chinese Valves, using now Shuguang 845C, Metalplate ones
the major improvement i got in the midrange. Before using a L-pad , the mids were too predominant, adding some coloration, specially with voices. Now the system sounds more balanced. I think however, lowpass the midbass horn, but higher than tried before, 700hz, might be interesting to try out.... maiby at 1000hz.....
Today i made some inroom spl measurments of the system with a Radio Shack SPL meter.
Distance from the speakers was around 13 feet / 4m, and calibration at 80db/1000hz.
Above 400hz, i measured twice, with small differences.
Below the results. What is remarkable, ist that above 10khz, spl decreases rapidly. I didn't expect this....