User manual SMART DEVICES DASA300

[. . . ] Returned equipment or defective parts must be shipped freight prepaid to us by the dealer or customer. Our limited warranty does not cover damages resulting from accident, misuse or abuse, lack of responsible care, or failures not attributable to manufacturing defects, except as provided herein. makes no warranties, express or implied, including warranties of merchantability or fitness for a particular purpose. RETURN POLICY: Factory authorization MUST be obtained before returning any product. [. . . ] Equipment returned without a factory RA (Return Authorization) will be refused. DASA300 Three Way Electronic Time Delayed Crossover from the midrange band arrives at the same time at the listener's ear, the tones combine acoustically in phase and produce a clear, transparent sound. Jumpers have been provided in the circuitry of the DASA300 to align most of the common stage speakers by varying the delay. Figure 2 shows mechanical misalignment of the a 3 way speaker arrangement. SECTION 1 INTRODUCTION The DASA300 Three Way Time-Corrected Electronic Crossover is a multi-channel electronic crossover designed specifically for cinema use. This product contains features not found in other products of its type. The DASA300 contains three identical crossover channels for the stage speakers, along with its own AC power supply that can operate from 110-120 VAC or 220240VAC 50/60 Hz line voltages. Each channel has its own adjustment for time correction of the high frequency/horn driver and the low frequency woofer(s) to align acoustically relative to the midrange speaker. Although it is desirable to use identical stage speakers for stereo in an auditorium, non-similar types can be accommodated and the time correction for each channel can be individually adjusted. 8" CD horn compensation. The new constant directivity horns offered by most major loudspeaker manufacturers hold their published dispersion patterns very nicely. Early design horns used in cinemas until the early 1960's were very directional at higher frequencies. A horn may have a 90degree by 40-degree pattern at the crossover frequency, but as the frequency tone went up, the pattern could narrow as low as 10 degrees. You could only hear all tones directly on-axis of the horn. Three Way Electronic Crossover. Keep all wiring from this connector away from the AC lines and speaker output lines from the power amplifiers. Wire the inputs of the power amplifiers for this mode. Allow ventilation space for the electronic crossover. It is not good practice to wedge the crossover between two power amplifiers without the vent panels separating the units. SECTION 3 be concerned with the level of the other parts of the audio spectrum at this time. With a ruler, measure the distance from the point where the voice coil of the woofer is to the voice coil/diaphragm of the MF driver. This is the acoustic difference between the two components. Also measure the distance between the coil/diaphragms of the MF driver and the HF driver. The DASA300 is configured so that the HF and LF may be positioned behind the MF driver. Refer to the following CROSSOVER DELAY chart to determine the best setting of the jumper "shunts" for each channel and each delay of the DASA300 (See figure 3 for diagram of front panel shunt positions). You may wish to reposition the mechanical alignment of the horn/HF driver before securing it to the enclosure for an even multiple of 2. 5". [. . . ] Observe your real time analyzer response to determine the best wiring scheme. All channels should be set to the same time correction setting when using identical model speakers. Leave the security cover off the DASA300 until you have completed your room equalization. This will allow you to make minor adjustments to the HF level setting as you continue to tune for the flattest response. CALIBRATION Remove the front security cover with the allen wrench provided with the product. [. . . ]