Parasound 275 User Manual

Model 275 v.2

Two Channel Amplifier

OWNER’S GUIDE

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 intended to alert the user to the presence of important operating and
maintenance instructions in the literature accompanying the product.

TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER. NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL

1. Read Instructions — Read all the safety and operating instructions before operating this product.

2. Retain Instructions — Retain safety and operating instructions for future reference.

3. Heed Warnings — Adhere to all warnings on the product and in the operating instructions.

4. Follow Instructions — Follow all operating and use instructions.

5. Cleaning — Unplug this product from the wall outlet before cleaning. Use a damp cloth for cleaning. Clean the outside of
the product only.

6. Attachments — Do not use attachments that are not recommended by the product manufacturer; they may be
hazardous.

7. Water and Moisture — Do not use this product near water.

8. Accessories — Do not place this product on an unstable cart or stand. The product may fall, causing bodily injury and
damage to the product. A product and cart combination should be moved with care. Quick stops, excessive force, and
uneven surfaces may cause the product and cart to overturn.

9. Ventilation — Slots and openings in the cabinet are provided for ventilation to ensure reliable operation of the product
and to protect it from overheating. These openings must not be blocked or covered. This product should not be placed in
a built-in installation such as a bookcase or rack unless proper ventilation is provided.

10. Power Sources — Operate this product only from the type of power source indicated on the label. If you are not sure of
the type of power supply to your home, consult your dealer or local power company. This product is equipped with a
three-prong grounding plug. This plug will only fit into a grounding power outlet. If you are unable to insert the plug into
the outlet, contact your electrician to replace your obsolete outlet. Do not defeat the safety purpose of the grounding plug.

11. Power Cord Protection — Power supply cords should be routed so that they are not likely to be walked on or pinched
by items placed upon or against them.

12. Lightning — Unplug the unit from the wall outlet for added protection during a lightning storm and when it is left
unattended and unused for long periods of time. This will prevent damage to the product due to lightning and power line
surges.

13. Overloading — Do not overload wall outlets or extension cords. This can result in a fire or electric shock.

14. Inserting Objects into Unit — Never push objects of any kind into this product through any openings; they may touch
dangerous voltage points or short out parts that could result in fire or electric shock.

15. Servicing — Do not attempt to repair or service this product yourself. Opening or removing covers may expose you to
dangerous voltage and other hazards. Refer all servicing to qualified service personnel.

16. Damage Requiring Service — Unplug this product from the wall outlet and refer servicing to qualified
service personnel under the following conditions: a) If the power-supply cord or plug is damaged.
b) If liquid has been spilled into the product. c) If the product has been exposed to rain or water. d) If the product does
not operate normally by following the operating instructions. e) If the product has been dropped or damaged in any way.
f) If the product exhibits a distinct change in performance.

17. Replacement Parts — When replacement parts are required, be sure the service technician has used replacement parts
specified by the manufacturer. Unauthorized substitutions may result in fire, electric shock, and other hazards.

18. Safety Check — Upon completion of any service or repairs to this product, ask the service technician to perform safety
checks to determine that the product is in proper operating condition.

19. Wall or Ceiling Mounting — Mount the product to a wall or ceiling only as recommended.

20. Heat — The product should be situated away from heat sources such as radiators, heat registers, stoves, and other
products (including amplifiers) that produce heat.

3

Table of Contents

Introduction ..................................................4

Placement and Ventilation Guidelines ..............................5

Rack Mounting ................................................5

AC Mains Voltage .............................................6

Rear Panel Connections and Controls ..............................6

Bridged Mono Operation .......................................8

A+B Speaker Load Switch .......................................9

Turn On Options .............................................. 10

Front Panel Operation.......................................... 12

Problems and Remedies ........................................ 13

If You Require Assistance or Warranty Repair ....................... 14

Specifications ................................................ 15

4

INTRODUCTION

Thank You for Choosing Parasound

Your new Parasound Model 275 v.2 power amplifier has been designed with proven class AB amplifier
technology. The Model 275 v.2 is built to extremely strict quality and performance standards for which
Parasound is renowned. We’re proud to offer you this exceptional audio component that will bring you
many years of enjoyment and dependability. We designed your new Model 275 v.2 Amplifier to perform
at a higher level of sonic performance than you may have expected and we encourage you to read this
entire manual to maximize your enjoyment. We wish you many years of listening enjoyment.

-The Parasound Staff

Keeping Records for Future Reference

Record the serial number located on the back panel or bottom of your Model 275 v.2 in the space

below. Also note your Parasound Dealer’s name and telephone number. Your purchase receipt/bill of

sale is required to determine if your Model 275 v.2 is eligible for Parasound warranty service. We
recommend that you make an extra copy of your original purchase receipt/bill of sale and store it inside
the Model 275 v.2’s carton.

Parasound Model 275 v.2 Amplifier Serial #: ______________ (5 digit number below the bar code)

Parasound Dealer: ___________________________________________________

Parasound Dealer Phone Number: ___________________

Date of Purchase: ______________________

Important Warranty information

There is no Parasound warranty for this unit if it was not purchased from an Authorized
Parasound Dealer. Investigate warranty coverage statements made by an unauthorized dealer very

carefully, as you will need to depend entirely upon your dealer, and NOT upon Parasound.
Unauthorized dealers lack the capability to make repairs or arrange for repairs of Parasound
equipment. A list of Authorized Parasound Dealers and detailed warranty information is available at
www.parasound.com or you can call 415-397-7100 between 8:30 am and 4 pm Pacific time.
A missing or altered serial number could indicate that this unit was re-sold by an unauthorized dealer or
is stolen merchandise. If this unit is missing its serial number or the serial number has been altered, you
should return it to your dealer immediately for a full refund.

5

Unpacking Your Model 275 v.2 & Placement Guidelines

Unpacking Your Model 275 v.2

Carefully remove your Model 275 v.2 from its shipping carton and locate the enclosed accessories:

• AC power cord

• Two 12V DC trigger wires with mono plugs, one with 3.5 mm (1/8‖) mini plugs, one with a 2.5mm

sub-mini plug and a 3.5mm mini plug

While you are unpacking your Model 275 v.2, inspect it thoroughly for possible shipping damage and
tell your Parasound dealer immediately if you find any evidence of shipping damage. This would be a
good time to make a copy of your sales receipt to store with the Model 275 v.2’s original packing.

Note: Please save and store both the inner and outer cartons and, most especially, the foam packing
inserts to protect the Model 275 v.2 if you have to move it or ship it. You may wish to flatten the
cardboard cartons to save room in storage after cutting the taped seams on the bottom flaps.

Placement Guidelines

The Model 275 v.2 will be easier to use and will last longer if you follow these simple guidelines:

• Place the Model 275 v.2 on a surface that will adequately support its substantial weight.

• Use input and output cables that are long enough to leave some slack; that will enable you to pull

the Model 275 v.2 out of a cabinet to check or to change connections without inadvertently
disconnecting cables.

• The Model 275 v.2 should never be placed in a completely enclosed cabinet

• Place your Model 275 v.2 where you can route input and output signal cables as far as possible

from any AC cords.

• Where signal cables must cross AC cords they should do so only at a 90° right angle.

Ventilation Requirements

• Always position the Model 275 v.2 horizontally.

• The Model 275 v.2 should never be stacked immediately on top of another power amplifier.

• Do not install the Model 275 v.2 in an unventilated equipment cabinet or compartment. Pockets of

stagnant hot air can build up even in a cabinet with an open front and back.

Rack Mounting Your Parasound Model 275 v.2

The Model 275 v.2 front panel occupies only one rack space in a standard 19‖ equipment rack.

For rack mounting, you’ll need to use the Parasound RMK11 rack mounting kit (purchased separately).

We recommend that you use the 8 insulated shoulder washers with the four mounting bolts which are
included with the RMK11. Position these washers on both sides so they ―sandwich‖ the front panel
before the mounting bolts are screwed into the rack rail. This will eliminate metal-to-metal contact
between the Model 275 v.2 chassis, the equipment rack, and the other components in the rack.

Note: Tighten each bolt just enough to keep the unit secure in the rack to avoid deforming the shoulder
washers. Eliminating metal-to-metal contact reduces the likelihood of creating a ground loop that might
introduce hum into your system.

A single standard rack space is 1-3⁄4" (44mm) high in a 19" wide equipment rack. This measurement
standard was developed by the EIA (Electronic Industries Association) so manufacturers of electronic
components and equipment racks could build products in standardized heights that would fit in a
uniform space. Please call your Parasound dealer or Parasound Technical Services if you need
additional advice about rack mounting the Model 275 v.2.