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OPERATION
Fan cooling
TThe fan varies speed automatically to maintain safe internal temperatures and
minimize noise. Keep the front and rear vents clear to allow full air fl ow.
Hot air exhausts out the front of the amp so it does not heat the interior of the
rack. Make sure that plenty of cool air can enter the rack, especially if there
are other units which exhaust hot air into it.
Safe operating levels
The amp's protective muting system guards against excessive internal
temperatures. With normal ventilation and 4- to 8-ohm loads, the amplifi er will
handle any signal level including overdrive—but make sure that the speakers
can handle the full power! However, lower load impedances and higher signal
levels produce more internal heating. Into 2-ohm loads, frequent or prolonged
clipping (indicated by constant fl ashing of the red CLIP LED) may trigger power
cutback or even protective muting.
Bridged mono mode doubles the output impedance of the amp; 4 ohms
(DCA1644: 8 ohms) is the minimum load impedance. Heavy clipping may cause
muting. If this happens, see Troubleshooting, page 29.
操作
风扇冷却
风扇速度会自动变化，以保持安全的内部温度，并将噪音降至最
低。保持前后通风口畅通，让空气充分流动。
热空气从放大器前面排出，不会使机架内部变热。确保足够的冷
空气能进入机架，尤其是周围有其他设备向机架排放热空气。
安全操作级别
放大器的保护性静音系统可防止出现内部温度过高的情况。在正
常通风且负载在 4 至 8 欧姆范围内时，本放大器可处理任何信
号级别（包括超速驱动），当然，前提是确保扬声器能够处理全
功率！但是，较低负载阻抗以及较高信号级别可产生更多内部热
量。负载达到 2 欧姆时，频繁或长期的削波（由红色削波 LED
指示灯稳定发光表示）会触发功率降低，或甚至保护性静音。
桥式单声模式使放大器输出阻抗加倍；4 欧姆（DCA1644：8 欧
姆）是最小负载阻抗。大幅度削波可能导致静音。如果发生此种
情况，请参阅第 29 页的"故障诊断"。
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Table of Contents
Troubleshooting
