38 cm (15") woofer for PA applications.
| Cm | 0.18 mm/N |
|---|---|
| Rated power | 700 W |
| Maximum power | 1000 W |
| Nominal impedance Z | 8 Ohm |
| Frequency response | fu–3700 Hz |
| (fu: Lower cut-off frequency depending on cabinet) | . |
| Mean sound pressure level | 92 dB (2.83 V/1 m) |
| Maximum linear displacement | +/−5.5 mm |
| Excursion limit | +/−12 mm |
| Resonance frequency fs | 36 Hz |
| Height of front pole-plate | 12 mm |
| Voice coil diameter | 100 mm |
| Height of winding | 23 mm |
| Cutout diameter | 358 mm |
| Net weight | 11.5 kg |
| D.C. resistance Rdc | 7.2 Ohm |
| Mechanical Q factor Qms | 9.0 |
| Electrical Q factor Qes | 0.31 |
| Total Q factor Qts | 0.29 |
| Equivalent volume Vas | 195 l |
| Effective piston area Sd | 898 cm² |
| Dynamically moved mass Mms | 125 g |
| Force factor Bxl | 25 Tm |
| Inductance of the voice coil L | 2.6 mH |
| Connections | Spring terminals |
The PA 115 H is a compact bass reflex speaker which is outstanding value-for-money. It is fitted with the 38-cm (15“) PAW 38 woofer and the mid-to-high-range horn, HTH 8.7. A special feature of the PAW 38 is that it can generate a drop in frequency response from 2 kHz by around 25 dB without a low-pass filter. As a result, no components are required in the bass section of the crossover, as these would have an unfavourable effect on peak power handling and sensitivity. We decided on a separating frequency of 3000 Hz - a level both speaker drivers can cope with effortlessly.
The peak power handling of the speaker is 250 W. This value was determined in line with the standards using a continuous noise signal. This value is, however, far removed from practice, since music consists of many different impulses and surges. The effective value, that also tells us something about the heating-up of the voice coil, is much lower with music. This means the effective power-handling capabilities of the loud speaker are, in fact, much higher. We have successfully tested the PA 115 H with a professional amplifier up to the clipping limit, which means we can safely give the music power handling as 500 watts. This output produces a peak level of 120 dB at one metre distance.
