Ecler DPA600 User Manual

Also see for DPA1000: User manual

Contents

63.2. Mains connectionThe DPA amplifiers are fed with alternate currents, depending on the country, of 110-120, 220-240V47-63Hz. (see characteristics in the back of the unit) consuming:MODEL DPA600 DPA1000 DPA1400 DPA2000CONSUMPTION 830VA 1250VA 1720VA 3115VAThe mains cables must not be near the shielded cables carrying the audio signal, as this could causehumming.3.3. Signal input connectionsThe signal input connectors are of XLR-3 type (10), electronically balanced. The pin assignment is asfollows:HOT or direct signal > Pin 2COLD or inverted signal > Pin 3GROUND > Pin 1For unbalanced connection short-circuit pin 3 to pin 1.The “STK OUTPUT” (9) are in parallel with the inputs and are used to supply the same input signal to otheramplifiers or sound systems. This signal output connectors are of jack 1/4" type. The pin assignment is as follows:HOT or direct signal > TipCOLD or inverted signal > RingGROUND > BodyThe input impedance is 22K (balanced) with a nominal input sensitivity of 0dBV(1V). This impedancemakes possible to parallel several amplifiers without loosing audio quality.3.4. Subsonic filterThis filter cuts off inaudible frequency components which when amplified suppose a risk of damage to thelow frequency speakers as they generate excessive excursions of the woofer's diaphragm. The DPAs feature aswitchable, Butterworth shaped Subsonic Filter located inside the unit (see fig.) with a 25Hz cut-off frequency and18dB/oct slope.Subsonic filters are very important when playing back vinyl records because the phono cartridges arespecially sensitive to feedback and acoustic coupling at very low frequencies.DPA amplifiers are delivered with switched ON Subsonic Filter.CAUTION: Changes on the Subsonic Filter have to be performed by a qualified technician.3.5. Limiter circuitThis system is an always active protection inside the DPA series of amplifiers. The ANTICLIP circuitryconstantly analyses harmonic distortion caused by excessive signal excursion at the power amplifier's output andautomatically reduces the input level in order never to exceed 1% total harmonic distortion. The DPA range ofamplifiers are delivered with the anticlip system adjusted at a threshold of 1% THD (hard limiting). However, thisvalue can be switched to a softer limiting (5% THD) via an internal jumper (see fig.).The great convenience of such a circuit in any kind of installation has to be remarked: The clear advantageof a limiting system in front of conventional compressors is that the former does practically not alter the dynamicrange, acting only when the distortion threshold is reached.CAUTION: Changes on the ANTICLIP configuration have to be performed by a qualified technician.