Page 2 - Important Safety Instructions
2 Important Safety Instructions The lightning flash with the arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of “dangerous voltage” inside the product that may constitute a risk of electric shock. The exclamation point within an equilateral triangle is i...
Page 3 - Table of Contents
3 Table of Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Placement and Ventilation Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 AC Mains Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . ....
Page 4 - INTRODUCTION
4 INTRODUCTION Thank You for Choosing Parasound Your new Parasound Halo A 52+ power amplifier has been designed with the most advanced, proven class A/AB amplifier technology. The A 52+ is built to extremely strict quality and performance standards for which Parasound is renowned. W e’re proud to of...
Page 5 - Unpacking Your A 52+ & Placement Guidelines; AC Mains Voltage; NOTE: Before you plug this amplifier into an AC mains outlet:
5 Unpacking Your A 52+ & Placement Guidelines Unpacking Your A 52+ Carefully remove your A 52+ from its shipping carton and locate the enclosed accessories: • AC power cord • A 12V trigger wire for auto turn on. It has a mono 3.5 mm mini plug at each end. W hile you are unpacking your A 52+, ins...
Page 6 - Rack Mounting Your Parasound A 52+
6 Rack Mounting Your Parasound A 52+ W ith its four feet removed, the A 52+’s front panel height occupies three rack spaces: 5.25” or 133 mm. (A single standard rack space occupies 1.75” or 44.5 mm vertical height.) For mounting in a standard 19” equipment rack, you must use the Parasound HRA 3 rack...
Page 7 - Audio Connections; Audio Input Connections
7 Audio Connections Always disconnect the AC cord to your A 52+ before making or changing any input, output or trigger wire connections. Inserting or removing an input or output cable while the A 52+ is turned on can result in a blast of sound that can damage your loudspeakers. Make sure there is no...
Page 8 - Speaker Connections
8 Speaker Connections Speaker Terminals The A 52+ speaker terminals accept speaker wires with banana plugs, spade connectors or bare wire. Refer to “Bare W ire Speaker Ends” in the Technically Speaking section for information about bare wire termination. If you use spades make sure they are inserted...
Page 9 - Turn On Options
9 Turn On Options For convenience, there are three ways the A 52+ can be turned on and off: • Manually , by pressing the On-Off (Power) button on the front panel. • Automatically-Audio , when an audio signal is present at the audio Input jacks for channels 1 or 2. Channels 3, 4 and 5 can’t be used f...
Page 10 - AC Power Cord
10 12V Position (Automatic on/off) W hen the Turn On Options switch is set to its 12V position, the A 52+ is turned on and off only with an external +9 V to + 12 V voltage from your surround processor, preamp or AV Receiver. W hen the external voltage ceases the A 52+ will turn off immediately. The ...
Page 11 - Front Panel Operation
11 Front Panel Operation On-Off Button Push once to turn on the A 52+. W hen the A 52+ is turned on the dim blue glow around the On-Off button will become brighter and the five blue channel indicators will illuminate. Push the button again to turn off the A 52+. The front panel On-Off button will be...
Page 12 - Technically Speaking
12 Technically Speaking Balanced and Unbalanced Lines Recording and broadcast studios use balanced connections exclusively because of their inherent ability to reject noise and hum, thus assuring the best sound. Certain high quality preamplifiers and surround controllers built for residential use ut...
Page 13 - Parasound A 52+ Design Overview
13 common AC outlet or power strip, you’ll avoid the problems created by resistance in the house’s wiring. Hum and buzz is also caused when unwanted voltage flows through multiple component ground points called ground loops. Here are three tips to avoid ground loops: 1 . Your Cable TV or Satellite r...
Page 17 - Problems and Remedies
17 Problems and Remedies Unit will not turn on • Check the setting of the Turn On Options switch. (The front panel On-Off button will be disabled if this switch is set to Audio or 12V) • If using Audio Turn on, try increasing the sensitivity of the audio trigger by turning the audio threshold knob t...
Page 18 - Are You Having Difficulty?
18 Are You Having Difficulty? Repair or Service Call your Parasound dealer first. If the dealer can’t help you with your problem we encourage you to call Parasound’s Technical Service Department at 415-397-7100 , Monday - Friday, 8am - 4pm Pacific Time. W e can suggest other diagnostic tests you can...
Page 19 - Specifications
19 Input Sensitivity for 28.28 V Output into 8 Ω Unbalanced: 1 V Balanced: 1 V per leg Total Gain: 29 dB S/N Ratio > 112 dB, input shorted, IHF A-weighted > 102 dB, input shorted, unweighted Damping Factor > 1100 at 20 Hz DC Trigger Requirements +9 Vdc to +12 Vdc, 5 mA Audio Trigger Current...
