Automatic Turn On, AC Line LED | Parasound HCA-1205A specs

DC Trigger Connection

The DC Trigger allows you to turn on your amplifier with external DC voltage sources from + 9 Vdc to +12 Vdc. Use a two-conductor wire such as an 18 AWG speaker wire to connect the DC trigger from an external source to your amplifier. You should first determine the + DC voltage and ground conductor from the external source. For example, the AVC-2500 has DC trigger that uses an 1/8" mini jack where the tip is positive and the ring is negative (ground). In this case, you would terminate one end with an 1/8" mini plug and strip off a 1/4" of insulation and use bare wire on the other end. Connect the positive lead to the screw labeled +12 V on the amplifier’s DC trigger connector and the negative (ground) lead to the screw labeled GND. With the main power switch in the off (down) position, the amplifier can now be turned on with the external DC source.

Operating Your HCA-1205A or HCA-855A

Power Switch

Manual Turn On

Press the upper side to turn the unit on manually; press the lower side to turn the unit off.

Automatic Turn On

When the power switch is in the off position, the power amplifier can be turned on with an external DC voltage applied at the DC trigger connector on the rear panel.

AC Line LED

The AC line LED on the front panel of your amplifier will illuminate whenever AC is present at the AC connector. This LED indicates that the AC cord is connected and that power is currently applied to the amplifier.

Standby/Normal Operation LEDs

The red Standby LED will light when the amplifier is turned on either with the power switch or an external DC trigger. It will stay lit about four to five seconds while the amplifier circuits stabilize. After that, the red LED will turn off and the green normal LED will signal that the protection relays have switched off and that amplifier is ready to operate. The Standby LED will also light whenever there is a short circuit or other fault that triggers the protection circuitry. This may indicate one of the following conditions: DC present at the amplifier's input, a speaker impedance overload, a short circuited speaker line, or possible internal fault. If this LED remains lit, remove power to the amplifier and check all connections. During this time, the protection circuits should automatically reset. If the red LED stays lit after you reapply power, contact your Parasound Dealer, Installer or Parasound Technical Service for further advice.

Current Overload LEDs

The Current Overload LEDs for each channel only illuminates if the unit is driven past its maximum current capacity. These LEDs are not clipping indicators, but are designed to signal when you are exceeding the limits of your amplifier. If these LEDs light, it’s usually a sign that your speaker impedance is too low, resulting in too much current draw from the amplifier's power supply. In most imaginable listening situations with recommended loads, these LEDs should not illuminate.

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HCA-1205A specifications

The Parasound HCA-1205A is a highly regarded audio power amplifier known for its exceptional performance and versatile applications. Designed to deliver high-quality, reliable power to a range of audio systems, the HCA-1205A is particularly favored by audiophiles and home theater enthusiasts.

One of the standout features of the HCA-1205A is its five-channel configuration, allowing it to effectively drive multiple speakers while maintaining a compact footprint. Each channel is rated at 120 watts into 8 ohms and can deliver up to 200 watts into 4 ohms, providing ample power for a wide range of speaker types and impedances. The amplifier's robust power output ensures dynamic sound reproduction across all audio frequencies, translating to a compelling listening experience.

The HCA-1205A employs advanced circuit design, including a high-current, Class AB topology. This design strikes a balance between efficiency and sound quality, delivering clean, distortion-free amplification even during demanding playback scenarios. The amplifier incorporates large power supplies and heavy-duty output transistors, which contribute to its ability to drive low impedance loads without compromising performance.

Another notable feature of the HCA-1205A is its thermal management system. Equipped with large heat sinks and an advanced cooling design, the amplifier remains cool even during extended use, ensuring reliability and longevity. The inclusion of short-circuit and thermal protection circuits further enhances safety, preventing damage under adverse conditions.

Connectivity is made convenient with various input options, including RCA connections and balanced XLR inputs. The amplifier's rear panel features a range of output binding posts, allowing for flexible speaker connections and easy integration into existing audio setups. Additionally, the HCA-1205A supports bridged operation for increased power output in specific configurations.

Parasound is known for its commitment to quality, and the HCA-1205A is no exception. Its build quality is robust, featuring a sturdy chassis that minimizes vibration and interference. The amplifier's aesthetic design, with a sleek finish and informative front panel, fits seamlessly into any modern audio or home theater environment.

In summary, the Parasound HCA-1205A is a powerful and versatile audio amplifier that stands out due to its exceptional sound quality, advanced technological features, and reliable performance. Whether for a robust home theater setup or a high-fidelity audio system, the HCA-1205A is an excellent choice for those seeking to elevate their listening experience. Its combination of power, efficiency, and flexibility solidifies its status as a preferred amplifier among audio enthusiasts.