Vifa-Infinity Buyout Speakers

 

I started this project for a good friend of mine who was moving to her first apartment. Up until I built this set of speakers for her, she had been dealing with the dinky computer speakers for music and really bad mono speaker in her TV. I built this pair for her L/R speakers and gave her an old Kenwood Receiver and some surrounds and centers from an old "Home Theater in a Box" set I used to have as a Yule present.

Thanks have to go to Curt C. who helped me out by generating a superb computer optimized crossover for this project. His crossover design is being reposted with his permission. He asks however that you do not use his designs for commercial purposes.

These really do sound VERY good for their cost. And even sealed they put out a good about of sound down to around 40hz (Her living room is small (an efficiency apartment) and there is a small 50W subwoofer covering the low end.)

Drivers: 

Costs:

Item PE Part # Qty. Cost Each Cost Total
VIFA TC18WG-15-08 299-493 2 $9.00 $18.00
Dayton 1-1/8" Silk Dome 275-070 2 $9.95 $19.90
Dayton 2ohm Non-Inductive resistor 004-2 2 $1.25 $2.50
Dayton 8ohm Non-Inductive resistor 004-8 2 $1.25 $2.50
Dayton 6ohm Non-Inductive resistor 004-6 2 $1.25 $2.50
Jantzen .56mH 18 GA AIR CORE 255-232 2 $2.84 $5.68
Jantzen .70mH 18 GA AIR CORE 255-238 4 $2.84 $11.36
Dayton 4.0uF-250V Polyprolen Caps 027-421 2 $1.85 $3.70
15uF-100V Non-polar Eletrolytic Caps 027-344 4 $0.70 $2.80
Speaker Terminal W/ binding posts. 260-303 2 $2.75 $5.50
      Grand Total (Pair) $74.44

These Prices do not include cabinet construction which cost roughly $40 for a pair. (I used poplar pre-veneered plywood.) So a Pair of Mid-budget speakers for $125 in parts.

Cabinet Dimensions:

Cabinet Size 1.3cu ft (about .1 cu foot is taken up with bracing)
Baffle width 8" Internal 6.5"
Depth 8.5" Internal 7.75"
Height 46" Internal 44.5"
Baffle = 8"w x 46"t
Sides = 8.5"d x 46"t beveled tops.
Rear = 6.5"w x 44.5"t (Note: careful about the rear and bottom as the thickness of plywood is actually a bit less than 3/4")
Bottom = 6.5"w x 8.5"d
Top = 8"w x 8.5"d (beveled sides)

Then stuffed lightly with roughly 16oz "pillow-fill" and the area behind the woofer & tweeter covered with some acoustic foam.

Crossovers:

Lowpass:

Note: The R1011 & R1031 values are the resistive loads of the L1011 and L1031 inductors.

Highpass:

Note: R2021 is the resistive load of the Inductor L2021.

Frequency Response and Ohm Load plots:


Pictures: (Not very good....sorry about the quality. I hope to upgrade to a better digicam in the near future.)


These have since had a set of "feet" made for them using 1x2 Oak formed into an "X" using a lap joint and attached to the bottom of the cabinet to give it a bit of extra stability.

If you have questions: I can be reached on AIM (WyrdOne42) or via e-mail at: wyrdone AT gmail.com