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Фото и характеристики JL Audio XD400/4 |
Фрагмент инструкции
When bridged, each channel produces signals of equal magnitude, but opposite polarity. The combined output of the two channels provides twice the output voltage available from a single channel. The XD400/4 has been designed for bridging of its channel pairs without the need for input inversion adaptors. To bridge a pair of channels, use the “Left +” and “Right –” speaker connectors only (the “Left –” and “Right +” remain unused). When bridged, each channel will deliver optimum power into a 4 ohm load. When a pair of channels are bridged, they will deliver 200W x 1 into a 4 ohm load or 150W x 1 into an 8 ohm load. Operating a pair of bridged channels into a load lower than 4 ohms is not recommended. Because a bridged pair of channels requires that both channels receive input, you need to connect both left and right inputs to the source unit. Connection of only one input will result in reduced power output, increased distortion and can cause the amplifier to overheat. Do not do this! When a pair of the XD400/4’s channels are operating in bridged mode, the output will be in mono (only one channel). This mono channel can contain right channel only information, left channel only information or the sum of the information from both the right and left channels. In order to achieve one of these options, configure the inputs to that pair of channels in one of these two ways: 1) Left Channel Only or Right Channel Only Information: If you wish to send a left-only or right-only signal to a pair of the XD400/4’s channels, use a “Y-Adaptor” to split the single channel signal into both left and right RCA inputs. This option is useful when using a pair of the XD400/4’s channels to drive left channel speakers only and the other pair of the XD400/4’s channels to drive right channel speakers only. 2) Left + Right Channel Information: When bridged and fed by a stereo input, a pair of the XD400/4’s channels will automatically combine the left and right channels into a summed mono (left + right) channel. This option is useful when using a pair of the XD400/4’s channels to drive a subwoofer system or a summed mono center channel. Status LED / Protection Circuitry There is a single multi-color LED on the top surface of the amplifier to indicate the amplifier’s operating status. 1) Flashing Green: amplifier is powering up, audio output is muted. 2) Constant Green: amplifier is on and functioning normally, audio output is active. 3) Constant Red: Indicates that the amplifier has exceeded its safe operating temperature, putting the amplifier into a self-protection mode, which reduces the peak power output of the amplifier. When its temperature returns to a safe level, the red light will return to green and the amplifier will return to full-power operating mode. 4) Constant Amber (yellow): Indicates that an over-current condition has occurred and is accompanied by a muting of the affected channel(s). Because the muting behavior may be very short in duration, it may manifest itself as an audible, repetitive ticking noise in the output. Over-current conditions can be caused by a speaker impedance lower than the optimum load impedance range for the amplifier or a short- circuit in the speaker wiring. The latter can result from a short circuit between the positive and negative speaker wires or between either speaker wire and the vehicle chassis. The “Status LED” will remain amber for a few seconds, even if the over-current condition is of a very short duration. This functionality can be used to diagnose a short-circuit by only connecting one channel at a time. The “Status LED” will turn amber when you connect the channel that is experiencing the problem and turn the volume up. 5) LED off / Amplifier Shuts Off Unexpectedly The only condition that will shut down an undamaged XD400/4 completely is if battery voltage or remote turn-on voltage drops below 10 volts. The “Status LED” will turn off when this occurs. The amplifier will turn back on when voltage climbs back above 11 volts. If this is happening in your system, have your charging system and power wiring inspected. For more information on troubleshooting this amplifier, refer to Appendix D (pages 16, 17). Servicing your JL Audio Amplifier If your amplifier fails or malfunctions, please return it to your authorized JL Audio dealer so that it may be sent in to JL Audio for service. There are no user serviceable parts or fuses inside the amplifier. The unique nature of the circuitry in the JL Audio amplifiers requires specifically trained service personnel. Do not attempt to service the amplifier yourself or through unauthorized repair facilities. This will not only void the warranty, but may result in the creation of more problems within the amplifier. If you have any questions about the installation or setup of the amplifier not covered in this manual, please contact your dealer or technical support. JL Audio Technical Support: (954) 443-1100 9:00 AM – 5:30 PM (Eastern Time Zone) Monday...
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