50 mm (2") High-End titanium dome driver for the midrange band between 800 and 5000 Hz. Due to the enormously strong and ultra-light titanium dome and in conjunction with a highly damped surround, linear frequency response and no partial oscillations. Due to the enormously high magnetic flux in the ferrofluid-filled air-gap a high efficiency and high power handling are possible.
| Nominal impedance Z | 8 Ohm |
|---|---|
| Frequency response | 400–15000 Hz |
| Mean sound pressure level | 90 dB (1 W/1 m) |
| Opening angle (-6 dB) | 180°/4000 Hz |
| Resonance frequency fs | 430 Hz |
| Magnetic induction | 1.4 T |
| Magnetic flux | 880 µWb |
| Height of front pole-plate | 3.5 mm |
| Voice coil diameter | 50 mm |
| Height of winding | 3 mm |
| Cutout diameter | 106 mm |
| Net weight | 1.26 kg |
| D.C. resistance Rdc | 6.7 Ohm |
| Mechanical Q factor Qms | 1.19 |
| Electrical Q factor Qes | 0.7 |
| Total Q factor Qts | 0.44 |
| Equivalent volume Vas | 0.05 |
| Effective piston area Sd | 20 cm² |
| Dynamically moved mass Mms | 1.2 g |
| Inductance of the voice coil L | 0.16 mH |
| Connections | 4.8 x 0.8 mm (+)/2.8 x 0.8 mm (-) |
| Peak power handling with high pass | 180 W (12 dB/Okt.; 800 Hz) |
| Nominal power handling with high pass | 120 W (12 dB/Okt.; 800 Hz) |
The first thing one notices about the CASABLANCA IV cabinet is its striking design. This cabinet shape, however, has more than just eye-catching qualities, its acoustic qualities have to be heard to be believed.
The speaker consists of a large lower chamber and a top-mounted upper chamber and the two are interconnected through an opening that has been exactly calculated. This is, in fact, a twin-chamber bass reflexcabinet. As a result of the twin-chamber arrangement, it is possible, in comparison with a conventional bass reflex cabinet, to extend the range downwards by a considerable amount. The Helmholtz resonance of the upper chamber is around 90 Hz, that of the lower chamber around 33 Hz.
The woofer in the CASABLANCA IV is the AL 200 - 8 OHM, which is so popular among connoisseurs of high-end technology. Thanks to its long-stroke woofer, the AL 200 - 8 OHM helps the CASABLANCA IV achieve unbelievably low-range bass levels and, at the same time, producing remarkable maximum volume levels for a speaker of this size. Another "first" in this model is the two tried-and-tested DSM 50 FFL - 8 OHM and DSM 25 FFL - 8 OHM titanium dome units, that guarantee transparent, rounded sound qualities across the entire mid- and high-range.
Results: The result is an unusual speaker both as regards its design and its construction principles with excellent low-range bass reproduction coupled with tremendous signal fidelity.
The 5th generation of VISATON's classic ATLAS COMPACT is positioned in the mid- and high-ranges and compares with the systems mentioned at the beginning of the series. Once again, we have the DSM 25 FFL - 8 Ohm and DSM 50 FFL - 8 Ohm dome loudspeakers. The low- to mid-range is covered by the AL 170 - 8 Ohm. What is new in this version is the TIW 300 - 8 Ohm as the woofer.
The crossover, too, has been thoroughly reviewed. The separating frequency between the woofer and low- to mid-range unit has been set at 220 Hz. Thanks to this relatively low separating frequency, the bass is particularly powerful between 50 and 100 Hz. This is accompanied, however, by a reduction in impedance in this range of frequencies. There is compensation for the increased impedance in the woofer (KN 27 mH, 330 µF) which prevents this low impedance curve, but this also reduces the bass output level at 80 Hz by around 3 dB (red line below 100 Hz). This can be a great advantage in rooms where the bass output level is boosted excessively by resonance. Where the output level is more important and a reduction in nominal impedance at 80 Hz to 4 ohms is acceptable, the impedance compensation is simply deactivated to produce the higher frequency graph. In this way, the ATLAS COMPACT MK V offers a tangible advantage in that the bass output level can be trimmed to suit the listening room.
The broad chamfers in the upper part of the baffle give the cabinet a slimmer appearance while, at the same time, avoiding the build-up of corner reflection in the sensitive mid- and high-ranges.
The ATLAS COMPACT MK V is a very dynamic speaker with powerful bass reproduction but without getting woolly in the bass department. Additional features are absolutely neutral voice reproduction and crystal-clear high-frequency sounds without sharp edges.
