With the aim of providing high acoustical output even when used with lower power, the APS 8 R was designed for use in an 8.5-litres reflex enclosure, with tuning between 30 and 40Hz. The APS 8 R has been specifically developed to be combined with either the AP8.9 bit or AP4.9 bit / AP4 D. Prima subwoofer components have been developed with a primary goal: to deliver high output in tight spaces. Output is a matter of excursion; the more air the cone moves, the more output. However reduced mounting depth traditionally has meant low excursion. Prima subwoofers employ a special cone-dustcap-basket geometry which guarantees large excursion of the mobile group, while keeping the mounting depth to a minimum. The surround and spider have been carefully designed to prevent the rocking-mode phenomenon. The cooling circuit has been designed with air vents on the basket underneath the spider, eliminating the need for vents on the bottom-plate. This allows the subwoofer to be mounted close to the back wall of the enclosure, making the most of the reduced mounting depth.
TECHNICAL SPECS
| Size | 200 mm |
| Power Handling - Peak | 500 W |
| Power Handling - Continuous | 250 W |
| Impedance | 4 Ohm |
| Magnet Material | HIGH DENSITY FLUX FERRITE |
| Voice Coil Ø | 40 mm |
| Woofer Qes | 0,43 |
| Cone Material | WATER REPELLENT PRESSED PAPER |
| Xmax | 8.8 mm |
| Xmech | 16.5 mm |
ELECTRIC-ACOUSTIC SPECS
| D | 173 mm |
| Driver Displacement Volume | 0.67 |
| Re | 3.7 Ohm |
| Fs | 32 Hz |
| Vas | 26.5 l |
| Mms | 80 g |
| Cms | 0.33 mm/N |
| BL | 11.5 T•m |
| Qms | 5.1 |
| Qts | 0.41 |
| Le Standard | 1.45 mH |
| Spl | 84 dB |