Thumbnail Filmstrip of Alto III C Speaker Kit Images
Visaton Speaker Kit - Alto III C
Art. No. 5972
Visaton Alto IIIC (accessories not included) - shown assembled with suggested cabinets, not supplied.
Characteristics and Sound Properties
The ALTO III c has been designed as a 3-way column speaker with an inside volume of no less than 55 litres. The twin bass arrangement using two W 170 S - 8 Ohm drivers in parallel guarantees very powerful low-ranging bass reproduction, that comes across crisply and impressively even with hard-hitting beat.
From around 450 Hz upwards, the 10 cm mid-range cone W 100 S - 4 Ohm takes over, mounted in its 3 litre enclosure. Single instruments and solo voices are reproduced throughout the mid-range in a most tangible, crisp fashion, where the precise definition of virtual sound sources and their associated range layering, so typical for good mid-range cones, comes across well.
Above about 3500 Hz, the sound character is rounded off neatly by the crisp 19 mm tweeter DT 94 - 8 Ohm. The exuberance demonstrated by the ALTO III c promises to put listeners in a good mood and keep them there for several hours of musical pleasure.
Technical Specifications
Rated power | 100 W |
Maximum power | 180 W |
Nominal impedance Z | 4 Ohm |
Frequency response | 35-22000 Hz |
Mean sound pressure level | 86 dB (1W/1m) |
Cut-off frequency | 450 / 3500 Hz |
Principle of Housing | Bassreflex |
Net volume | 44 + 3 litres |
Outer dimension height | 1000 mm |
Outer dimension width | 230 mm |
Outer dimension depth | 300 mm |
Frequency and Impedance Response
Frequency Response and Impedance Graph
Exploded Cabinet Drawing
Exploded Speaker Box Drawing
Assembly
The cabinet consists of boards stuck together (butt jointed), making construction a simple matter. The two boards for the closed mid-range compartment are fitted inside the cabinet before the last side panel is glued in place. Before this, an 8 mm hole has to be drilled in the rear panel of the mid-range enclosure for the connection leads. The crossover unit is mounted on the rear panel behind the upper bass cut-out.
Internal Damping
The damping of the speaker uses eight mats of damping material pushed into the cabinet. To this end, the mats are folded once long ways and once crossways and pushed into the cabinet in such a way that the space behind the bass tubes remains free and the rest of the space inside the cabinet is loosely filled.
Component Parts List for Each Box - Supplied with Kit
The kit comes with all necessary components (see list below for one box), one set if the speaker is an each, or two sets for a pair, see price above for details.
Tweeter | DT 94 - 8 Ohm | 1 pc. |
Midrange driver | W 100 S - 4 Ohm | 1 pc. |
Woofer | W 170 S - 8 Ohm | 2 pcs. |
Crossover | ALTO III C | 1 pc. |
Bass reflex tube | BR 15.34 (full length) | 1 pc. |
Terminal | ST 77 | 1 pc. |
Damping material | Polyester wool | 4 bags |
Wood screws | 3.5 x 19 mm | 6 pcs. |
Countersunk screws | 3.5 x 25 mm | 38 pcs. |
Cable | 2 x 1.5 mm² | 3.5 m |
Speaker Cabinet Material List to Make 1 Box - Not Supplied with Kit
Parts for One Box (not supplied) | Size (mm) | Quantity |
Material: 19 mm chipboard or MDF recommended | ||
Top and bottom panel | 192 x 262 | 2 |
Side panel | 262 x 1000 | 2 |
Front and rear panel | 230 x 1000 | 2 |
Midrange rear panel | 192 x 250 | 1 |
Midrange bottom panel | 192 x 70 | 1 |
Speaker Cabinet Dimensions
Loudspeaker Box Construction Diagram - all dimensions in mm.
Crossover - Supplied with Kit Already Assembled
Speaker Kit Crossover Circuit