VOX 252 MTI



 

Exploded drawing

Assembly

Construction

At first sight, the construction of the VOX 252 MTI looks complicated, which is why it is worth looking at each internal part individually first.

In the lower part of the cabinet, you can see the bass reflex tunnel, made up of the base and two upper boards. In the middle, there are five cross-reinforcements to prevent resonance. At the top of the cabinet, behind the cut-out in the acoustic baffle for the mid- to high-range unit, is the enclosure required for the mid-range cone, made up of two wooden boards. Three 8 mm holes will have to be drilled in the rear wall of the mid-range chamber for the cables. They should not be drilled directly behind the driver because otherwise there will not be enough depth available for the wires behind the magnets. The holes must be well sealed afterwards.

Fitting the TIW 250 into the side is a special feature. The mounting board for the TIW 250 (380 x 283 with a 233 mm cut-out) itself is glued in place from inside behind the cut-outs in the corresponding side-wall. This means that the bass driver can be recessed by 19 mm (19 mm = thickness of the boards). For optical reasons, and to enable the cloth-covered frame to be fitted exactly in place, the side-wall cut-out must be made extremely accurately. The frame can be made from a 16 mm board, in which a cut-out is made the same size as the outer diameter of the TIW 250 outer edge. The outer dimensions of the frame should be 2 mm smaller than the opening in the side-wall. In this way, the frame is jammed in place by the fabric used to cover it and alternative fixing methods (wooden plugs) are not necessary.

Two triangular reinforcing pieces are installed between the front panel and side walls to provide the required rigidity at the front despite the broad bevel.

The frequency crossover unit is mounted on the side-wall behind the bass cut-out.

Inner damping

Inner damping

The damping uses one mat placed in the medium range cabinet. The remainder is evenly distributed throughout the cabinet. The area above the tunnel opening (at the rear of the front panel) up to the lower edge of the reinforcement remains free. If, as a result of the acoustics in the room, the low-range bass is too powerful, damping this area will have a corresponding effect on the overall bass output level.

Component parts list for 1 box

Component parts list for 1 box
Tweeter:MHT 12 8 Ohm1 piece
Midrange:TI 100 8 Ohm2 pieces
Woofer:TIW 250 8 Ohm1 piece
Crossover:"VOX 252 MTI"
Terminal:BT 95/751 piece
Damping material: 4 bags
Special wood screws:5 x 30 mm4 pieces
Wood screws:3,5 x 19 mm12 pieces
Countersunk screws:3,5 x 25 mm4 pieces
Material for speaker covers:width 50 cm1 m
Cable:2x 1,5 mm22 m
2x 2,5 mm22,5 m
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Cabinet parts list for 1 box

Cabinet parts list for 1 box
PartsSize (mm)Quantity
Material: 19 mm MDF or chipboard
Front panel1150 x 1971
Side panels1150 x 3812
Bottom, top panel197 x 3812
Rear panel197 x 10321
Bass reflex channel 1197 x 2701
Bass reflex channel 2197 x 651
Braces197 x 505
Midrange rear panel197 x 3991
Midrange bottom panel197 x 601
Monting board woofer380 x 2831
Material: Triangular ledge
Brace1112 x 30 x 302
Material: 16 mm MDF or chipboard
Grille boardØ 293

Sketch

Sketch

Crossover

Press

Extract from Klang & Ton

With their VOX 252 MTI, VISATON have, once again, created great results. This is not only the best VOX there has ever been, it is, in my opinion, the best sounding VISATON speaker of all. Ready-made speakers of this quality will often cost as much as 10,000 a pair. The DIY concept is definitely a winner here.