Table of Contents

 

Important Safety Instructions

3

Figure #1 HCA-1205A Front and Rear Panel Drawings

4

Figure #2 HCA-855A Front and Rear Panel Drawings

5

Introduction

6

Installing and Rack Mounting Your Amplifier

6

Ventilation Requirements for Your Amplifier

6

Making Connections to Your Amplifier

6

Speaker Connections

7

AC Power Connections and AC Grounding

7

DC Trigger Connection

8

Operating Your HCA-1205A or HCA-855A

8

Maintaining Your Parasound Amplifier

9

In Case of Trouble

9

Parasound HCA-1205A Specifications

10

Parasound HCA-855A Specifications

11

Special Features for the Parasound HCA-1205A and HCA-855A

HCA-1205A Designed by John Curl

HCA-1205A THX certified by Lucasfilm Ltd.

Independent power supplies for each channel

1.6kVA power transformer, 100,000 uF filter capacitance in the HCA-1205A

1 kVA power transformer, 68,000 uF filter capacitance in the HCA-855A

Modular circuit board layout

Massive toroid power transformer

Multiple polystyrene film bypass capacitors in power supply

Can be powered with external DC source

Cascode Class A input stages with matched J-FET pairs

Hand-picked complementary transistors in high voltage driver stage

15 ampere 50 MHz output transistors

Output transistors direct-coupled to speakers without LRC networks

DC servo direct-coupled audio circuits with 0.8 Hz rolloff

High-bias Class A/AB operation

Gold-plated metal structure RCA input jacks

Multiple protection circuits, temperature sensors and silver-cadmium relay protection

Glass epoxy circuit boards, double-sided for precision Custom designed audiophile-grade AC power cord

L U C A S F I L M

R

The Parasound HCA-1205A is manufactured under license from Lucasfilm Ltd. Lucasfilm and THX are trademarks of Lucasfilm Ltd.

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Parasound Table of Contents Important Safety Instructions, Figure #1 HCA-1205A Front and Rear Panel Drawings

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.