Boulder 1108 Manuale utente

1108 Phono Preamplier

Boulder Ampliers, Inc.

255 S. Taylor Ave.

Louisville, CO 80027

(303) 449-8220

www.boulderamp.com

www.facebook.com/BoulderAmpliersInc

06/01/2019

Rev. 1.0

P/N: 91059

About

About Boulder Ampliers, Inc.

Boulder was founded in 1984 and is the last high-performance audio

manufacturer operating in North America to still perform all of its own

design, engineering and manufacturing in-house. While this form of

production may be more costly than outsourcing, the resulting quality

control and reliability of the nished products are never compromised.

In 2016, Boulder moved into a new, purpose-built production facility to

increase manufacturing efciency and offer space for expansion to meet the

needs of future growth.

Thank You

Congratulations and thank you for selecting the Boulder 1108 Phono

Preamplier for your high-performance sound system. We are certain it will

provide you with many years of listening pleasure.

The 1108 represents the concerted efforts of numerous Boulder designers,

engineers, and technicians working to bring you the best audio playback

components in the world. Please take a few moments to read through this

instruction manual prior to using your 1108. This will help you understand

the many functions and capabilities of the phono preamplier. It will also

allow you to maximize the convenience and performance for which it was

engineered.

Your Boulder 1108 Phono Preamplier has undergone extensive laboratory

tests for safety, functionality and technical excellence. In addition, it has been

individually subjected to rigorous listening trials in our sound room utilizing

a wide range of musical material. No product ever leaves our factory until we

are totally satised that it achieves its full potential.

Table of Contents

Getting Started

Introduction ••••••••••••••••••••••••••••••••••••••••••••••1-1

Audio Features ••••••••••••••••••••••••••••••••••••••••••••1-1

Operational Features ••••••••••••••••••••••••••••••••••••••••1-1

Unpacking and Care ••••••••••••••••••••••••••••••••••••••••1-2

Before You Start •••••••••••••••••••••••••••••••••••••••••••1-3

How to Clean the Casework •••••••••••••••••••••••••••••••••••1-4

Installation •••••••••••••••••••••••••••••••••••••••••••••••1-5

Placement and Installation ••••••••••••••••••••••••••••••••••••1-5

Connections ••••••••••••••••••••••••••••••••••••••••••••••1-6

Making Connections to the 1108 Phono Preamplier ••••••••••••••••••1-6

Connecting the Analog Outputs ••••••••••••••••••••••••••••••••1-7

Connection to AC Mains •••••••••••••••••••••••••••••••••••••1-8

Turntable Connection Types •••••••••••••••••••••••••••••••••••1-9

Connecting the Outputs to a Balanced Preamplier ••••••••••••••••••1-10

Unbalanced RCA Cable •••••••••••••••••••••••••••••••••••1-11

Connecting the Outputs to a Balanced Preamplier ••••••••••••••••••1-12

Connecting the Outputs to an Unbalanced Preamplier •••••••••••••••1-13

Setup and Loading •••••••••••••••••••••••••••••••••••••••••1-14

Personality Cards •••••••••••••••••••••••••••••••••••••••••1-14

Moving Coil or Moving Magnet Selection •••••••••••••••••••••••••1-15

Cartridge Loading Adjustment - Resistive •••••••••••••••••••••••••1-16

Cartridge Loading Adjustment - Capacitive •••••••••••••••••••••••1-19

Operation

Power •••••••••••••••••••••••••••••••••••••••••••••••••••2-1

Standby ••••••••••••••••••••••••••••••••••••••••••••••••••2-2

Mute ••••••••••••••••••••••••••••••••••••••••••••••••••••2-3

Input Selection •••••••••••••••••••••••••••••••••••••••••••••2-4

Mono •••••••••••••••••••••••••••••••••••••••••••••••••••2-5

Equalization •••••••••••••••••••••••••••••••••••••••••••••••2-6

Low Cut Filter ••••••••••••••••••••••••••••••••••••••••••••••2-9

Recording ••••••••••••••••••••••••••••••••••••••••••••••••2-10

Connections ••••••••••••••••••••••••••••••••••••••••••••••2-10

Table of Contents

Appendix

Technical Specications •••••••••••••••••••••••••••••••••••••••3-1

Dimensions & Weights •••••••••••••••••••••••••••••••••••••••3-2

1108 Preamplier Section Dimensions •••••••••••••••••••••••••••••3-3

Troubleshooting ••••••••••••••••••••••••••••••••••••••••••••3-4

Notes •••••••••••••••••••••••••••••••••••••••••••••••••••3-6

Getting Started

1-1

Getting Started

The 1108 Phono Preamplier embodies years of development and is

the second generation of 1000-level phono preamplier from Boulder.

Here are some of the features that set the 1108 apart from the com-

petition:

Audio features:

• Fully-balanced inputs and output circuitry

• Surface-mount design (SMD) circuitry wherever possible.

• Two pairs of balanced inputs and two pairs of balanced outputs on

XLR connectors.

• Boulder’s own 983 and 985 gain stages.

• Fully-adjustable resistive load settings to match the needs of your

phono cartridges.

• Standard RIAA equalization as well as EMI, Columbia, and FFRR

(London/Decca) for records produced before 1955.

Operational features:

• Fully-machined, non-resonant chassis design.

• Switchable gain and loading for MC (moving coil) or MM (moving

magnet) cartridges.

• Full logic control to reduce operational noise.

• Mono mode to optimize monaural playback with stereo cartridges.

• Ultra-efcient and noise optimized power supply to reduce inter-

ference with the delicate analog phono signal.

Getting Started

1-2

Getting Started

Unpacking and Care

The 1108 Phono Preamplier comes packed in a single box and is

heavy. It features nely nished casework. Please use care when

unpacking, lifting and installing the unit to avoid damage to the metal-

work or furniture. The 1108 Phono Preamplier weighs 37 Lbs (16.8

kg).

Be sure to save all packaging materials! The 1108 is shipped in a foam

wrap to protect the metal work’s ne nish. Try not to damage this

wrap in the event that the unit must be transported in the future.

Getting Started

1-3

Getting Started

Before You Start

The 1108 is a single-chassis unit that must be put in place and con-

nected.

You should have received a large, heavy box. The pieces included in-

side are:

1. 1108 Phono Preamplier

2. 1 x AC power cord

3. Instruction Manual

4. PHRCA RCA-to-XLR Adaptors

5. Spare Personality Cards with labels

6. Ground wire

If any of these pieces are missing or damaged, please contact your

Boulder dealer immediately before continuing the installation.

Getting Started

1-4

Getting Started

How to Clean the Casework

If the 1108 must be cleaned, use only a soft, lint-free cloth moistened

with plain water.

Never use any type of chemical cleaner unless recommended by your

dealer or the Boulder factory.

Do not use bleach! Bleach will remove the anodized surface of the

casework.

Never use any type of abrasive to clean the casework.

If you have any questions, please contact your authorized Boulder

dealer.

Getting Started

1-5

Getting Started

Installation

Placement and Installation

Your Boulder 1108 Phono Preamplier is designed to reduce the ef-

fects that external magnetic elds and radio frequencies (RF) have on

its circuitry. While placement is not critical, because of the high gain of

the 1108, known magnetic elds should be avoided whenever possi-

ble. Power transformers in other pieces of nearby equipment should

be placed a minimum of 12 inches (30 cm) away.

Because it is heavy, the 1108 must be placed on a sturdy, stable sur-

face.

Do not place in an enclosed rack without ventilation. The 1108 should

have at least 2 inches (5 cm) of airspace around the chassis for proper

cooling and airow.

Be sure to leave access to the the AC mains cable when installing the

1108. Depending on how easy it is to access the back panel of the

1108 it may be wise to preinstall the power and interconnect cables

before placement.

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