PMC Twenty 5.sub Diamant Black twenty5-sub-manual-nov16.pdf

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Page 1

No.

user guide

Hand built by

Page 2

Page 3

IMPORTANT – Register your warranty

Warranty

Please take a few moments to register your warranty at www.pmc-speakers.

com (click on ‘register a product’) or complete the warranty card at the

back of this booklet. This records the purchase of your subwoofer and provides

you, the customer an opportunity to make suggestions and provide feedback

directly to PMC.

Product Support

For product support, accessories or servicing advice, please contact

a PMC authorised dealer – See www.pmc-speakers.com.

THE PROFESSIONAL MONITOR COMPANY LIMITED

HOLME COURT, BIGGLESWADE, SG18 9ST, UK

T +44 (0) 1767 686300 F +44 (0) 870 4441045

sales@pmc-speakers.com

www.pmc-speakers.com

Ref No: 782

PMC Stock Code: 15089

Page 4

“

Peter Thomas, Owner &

Oliver Thomas, Head of Design

WHAT DRIVES US

At PMC, we believe that music is what really matters; it’s what moves us and

gives us the passion for what we do. The company was founded because there

wasn’t a loudspeaker that was transparent enough to convey all of music’s

expressive power – and we knew we could remedy this.

One of our core beliefs has always been that the same loudspeaker can be

used throughout the entire audio chain, from composer to studio or lm stage,

through post-production and mastering, right to the listener at home. Discerning

listeners all over the world agree. Our designs are involved in every link of the

music-making chain, from the recording studio to listening at home, which

means we know exactly how to present music as transparently as possible,

just as the artist intended. This knowledge, combined with our love for music,

drives us to create products that you listen through rather than to. We want

you to share the thrill of the original recording because there is nothing like the

emotional impact of true musical communication.

Loudspeakers are where science meets art; we understand the science so that

you can connect with the art.

Page 5

Congratulations – You have joined the elite

Stevie Wonder

ESPN

BBC

Tony Bennett

JVC Studios

EMI

SONY

Coldplay

elbow

For over twenty-ve years PMC has

earned an unrivalled reputation for

creating the world’s nest professional

loudspeakers. Simply put, our speakers

provide a reference for the world’s

highest prole productions and events.

They are found at every stage of the

creative process, from conception

to recording and broadcast and, of

course, in the home.

Our client list reads like a who’s who

of the sonically aware, with Elbow,

Stevie Wonder, Coldplay, Brian May,

Universal, EMI, Sony, Pinewood Studios,

Dreamworks, Deutsche Grammophon

and the BBC among the makers

of movies and music who use our

products.

Our loudspeakers were also used in

the production of Titanic, Spiderman III,

James Bond’s Skyfall and Spectre,

Finding Nemo, Pirates of the

Caribbean III, and during broadcasts

of the Beijing and London Olympics.

UNIVERSAL MUSIC GROUP

Thomas Newman

Afrojack

Kraftwerk

Royal College of Music

Warner Music

Pinewood Studios

Capit Studios

Page 6

Contents

Tip

General usage guidelines

Introduction

Advanced Transmission Line (ATL )

Laminair

System description

Unpacking and care

Installing the resonance absorbing plinth bars

Connections

Positioning and alignment

Operational controls

User EQ options

Integration - Initial setup settings

Running in

Specications

Service

The twenty5 series

Our meticulous attention to detail

Inspection checklist

Warranty on-line

Warranty certicate - part 1

Warranty certicate - part 2

Help us improve - Your comments

Page 7

Tip

General usage guidelines

Tip

Read these instructions and keep them in a safe place for future reference.

Heed all electrical safety warnings, including any on the subwoofer itself.

Do not use the subwoofer near water.

We have provided a high quality Microber cloth for cleaning. This is ideal as the cabinet

should only be cleaned with a dry, lint-free, cloth. Do not use solvents, abrasives, waxes

or liquids as they may be detrimental to the nish.

Floor spikes are sharp and should be treated with great care during installation and use.

Do not install near any heat sources such as radiators, ovens, other equipment that

produce excessive heat, or in unventilated softs or enclosures.

Unplug this product from both source and power during electrical storms or when unused

for extended periods of time.

Packing material can pose danger to the young and vulnerable.

Ensure these items are kept or disposed of safely.

High volume audio signals, however short their duration, have the potential to cause

hearing damage. Use care when setting the system volume level to ensure playback

sound pressure levels remain within safe comfortable limits.

Do not attempt to service the equipment. There are no user serviceable parts inside.

Please refer all servicing to PMC authorised personnel.

Servicing is required when the apparatus is damaged, exposed to moisture,

or exhibits a distinct or sudden change of operation or audio performance.

PMC has made efforts to provide accurate installation information and good quality

xings. PMC will not be held responsible or liable for injuries or property damage - direct,

indirect or consequential - arising out of use or inability to use this product safely and

properly.

The twenty5 subwoofer contains very powerful magnets and therefore may have

a detrimental effect if left in close proximity to magnetically sensitive items such as;

CRT (tube style) televisions or monitors and media such as oppy discs, cassettes

and videotapes.

Page 8

Introduction

Tip

Thank you for choosing the PMC twenty5 active subwoofer. This guide provides installation and

operating instructions.

This active subwoofers can be used in a 2.1 conguration with twenty5 series speakers to gain

extra bass extension and headroom, or they can be used to reproduce a low frequency effects

(LFE) channel in a surround system. Numerous congurations are possible, some of which are

illustrated in this guide.

The electronics built into the subwoofer cabinet include an ultra-low distortion Class-D power

amplier, with DSP-based gain, ltering, and bass management functions when the signal is

routed via the twenty5 sub. Balanced stereo analogue and AES3 digital inputs are accepted to

feed the subwoofer system, and these input signals are also passed through to the analogue and

digital outputs for connection with other devices. The outputs can be unprocessed or high-pass

ltered, and with xed or variable gain.

The input source, analogue input sensitivity, gain trim, and overall volume are all adjustable, as are

the subwoofer’s low-pass lter slope and frequency. Additionally, the phase can be adjusted and

a single parametric equaliser is provided to assist with in-room alignment. The analogue and digital

outputs can be high-pass ltered, if required, to feed satellite speakers in a 2.1 conguration.

This subwoofer builds upon PMC’s world-class design pedigree, combining the nest drivers

available with the unique

sophisticated Class-D amplication, and ultra-precise DSP control. PMC’s unique

(Advanced Transmission Line) bass loading principle, Laminair,

technology

uses contemporary materials to provide optimised absorption of unwanted low-midrange energy

within the cabinet, while extending bass output signicantly with negligible harmonic distortion.

The two long-throw g-weave bass drivers employed in the twenty5 subwoofer are a bespoke

PMC design delivering an unparalleled transient response. The twenty5 sub cabinet has a small

footprint, making it more convenient and easier to place than typical cube-shaped designs.

Page 9

Advanced Transmission Line

Tip

The source of PMC’s legendary natural and wholly

realistic sound is the Advanced Transmission Line

(ATLTM) bass-loading technology.

is an ingenious design which uses energy

ATL

generated by the bass unit in a much more

intelligent and efcient way than speaker designs

based on ported or sealed boxes.

In ATLTM loudspeakers, the highly braced cabinet

is lined with a multitude of custom-designed

acoustic materials that absorb all but the very

lowest frequencies. These are guided to exit from

a vent on the front-panel, extending the low-

frequency response and creating the impression

of a far larger speaker with an extra, ultra-high

quality bass unit.

improves more than just the bass response:

ATL

because the low end is clean and clear it doesn’t

mask the rest of the music. Vocals in particular,

are beautifully projected and ultra-vivid.

loudspeakers offer another benet. The ATLTM

ATL

bass extension does not change with volume

level – so even when listening quietly the bass

sounds balanced and well dened.

This cross-sectional view of the twenty5.24

loudspeaker shows the ATL

arrangement and the unique Laminair

cabinet

vents

Page 10

Taking ATL

Tip

to the next level

With the launch of the twenty5 series, loudspeaker audio performance has been taken to the

next level with the addition of the LaminairTM aerodynamic vent.

The ATL

design involves air moving under pressure at high speeds, and PMC’s Head of Design,

Oliver Thomas was able to apply aerodynamic principles transferred from his previous industry,

Formula 1 to the ATLTM concept.

The result is the unique Laminair

aerodynamic vent which creates an even smoother, laminar

airow at the exit from the transmission line.

This innovative solution

reduces turbulence and

drag at the ATLTM vent,

reducing resistance,

increasing efciency,

eliminating air noise, and

provides bass with supreme

timing and the ultimate

dynamic range.

‘Nothing else comes close to the clarity, timing, and dynamics.’

Page 11

System description

The twenty5 active subwoofer has a powerful

DSP engine, operating at a xed sample rate

of 96kHz.

The two balanced analogue inputs are

conditioned by an adjustable low-noise gain

stage prior to A-D conversion to optimise the

signal-to-noise ratio. The converter is a very

high quality delta-sigma device, producing

a 24-bit, 96kHz output. The left and right

channels are summed to drive the subwoofer

speakers, but passed on as separate signals

to the analogue outputs.

The AES3 digital input accepts sample rates

up to 192kHz, and is sample rate converted

to 96kHz automatically. Either channel, or a

sum of both, can be selected to drive the

subwoofer, and both are passed on to the

digital output.

The DSP engine provides the system volume

control, low-pass ltering, parametric

equalisation, and phase alignment for the

subwoofer, as well as high-pass ltering bass

management options for the analogue and

digital outputs. It also provides non-invasive

excursion limiting to protect the drivers.

The DSP system generates three sets of outputs.

In addition to the digital output, there are

two separate D-A converters. One converter

provides the analogue outputs, while the

other feeds a 400W Class-D power amplier

connected to the loudspeaker(s).

The analogue and digital outputs are always

available and can be formatted to provide

either full range or high-pass ltered signals,

which can be used for satellite speakers or other

destinations. The output level can be xed, or

follow the system volume control setting.

Analogue

Inputs

XLRs Adjust level

Digital

Input

AES3 XLR or RJ45

32-192kHz

Gain

Stage

for optimal

conversion

A/D

24-bit

converison

at 96kHz

Volume,

roll-off, PEQ,

phase and

protection

DSP

SRC

Sample rate

conversion

to 96kHz

Digital Output

DAC XLRs

Conversion

to analogue

DAC

AMP

Power amp

Analogue

Outputs

AES3 XLR and RJ45

Page 12

Unpacking and care

The PMC twenty5 active subwoofer is packed in a heavy-duty protective carton. Please retain the

carton to ensure that the loudspeaker can be transported safely if the need arises in the future. If you

dispose of the packaging please do so in an environmentally responsible and safe way.

What’s in the Box?

1x twenty5 sub

2x twenty5 sub plinth bars

1x Grille

4x Cork isolators

4x Spike pucks

4x M8 spikes

4x M8 countersunk bolts

1x AC mains power cable

2x RCA - XLR phono adapter

1x Cleaning cloth

1x User Guide

• The twenty5 sub is heavy. Please take care when lifting from the carton.

• Do not attempt to use the loudspeaker if the packaging has been water-damaged.

• Please Note: This unit must be earthed

Care and Service

In normal usage PMC speakers should provide many years of trouble-free operation, but in the unlikely

event that you suspect damage or failure has occurred do not attempt to repair the unit yourself.

There are no user-serviceable parts inside. Contact your dealer for advice and a service return

address.

Clean the cabinets with a dry and lint-free cloth, and avoid the use of solvents as they may damage

the nish of the unit.

Page 13

Installing the resonance absorbing

Tip

D E

plinth bars

Resonance damping plinth bars and spikes enhance the performance and

stability of the twenty5 sub. The bars attach to the base of each speaker

using 4 x M8 countersunk bolts. The twenty5 series spikes can be used on

sensitive hard ooring with the use of the spike pucks.

Carefully invert the subwoofer so that its base is uppermost. Take care not to damage the top of the cabinet when it is upside-down, the use of a soft cloth or square of carpet is suggested.

Locate the large M8 bolts and tighten them gently using the allen key

supplied until the heads of the bolts are ush with the bars surface. Once the bolts are ush carefully tighten each bolt by half a turn.

Do not over tighten. Over tightening will reduce the effect of the resonance absorbing material

The spikes are sharp and should be treated with great care and may damage hard ooring if in direct contact.

You have the option of using the spike pucks for use on more sensitive

ooring.

Re-invert the loudspeaker so that the spikes and plinth are at the bottom.

Once in position, level the loudspeaker by adjusting each spike in turn.

Page 14

Connections

Tip

Caution

To avoid potential damage, please ensure that the signal source is turned off before

connecting or disconnecting your twenty5 active subwoofer.

The rear panel of the twenty5 sub features the following connections:

Audio

2 x Balanced analogue XLR inputs

If you are using an unbalanced Phono/RCA analogue

connection, use the Phono/RCA to XLR converters

included.

1 x AES3 digital balance input

The balanced connections are wired: pin-1 screen

(ground), pin-2 positive, and pin-3 negative.

The input is selected via the rear panel menu system.

www.pmc-speakers.com

Each input has a corresponding output which can provide

either the full range signal or a high-pass ltered version,

selected via the menu system (see page 18).

Power

IEC (C14) mains socket with power switch. The twenty5 sub

accepts AC mains voltages between 90-132 and 180-264V.

In – Thru Connections

NO USER SERVICEABLE PARTS INSIDE

SERVICING BY AUTHORIZED PERSONNEL ONLY

CAUTION - RISK OF ELECTRIC SHOCK - DO NOT OPEN

PRECAUTION - RISQUE DE CHOC ELECTRIQUE - NAS PAS OUVRIR

WARNING - THIS ITEM IS CAPABLE OF PRODUCING HIGH SOUND PRESSURE

LEVELS WHICH COULD CAUSE PERMANENT HEARING DAMAGE

DO NOT USE WITHOUT AN EARTHED MAINS CONNECTION

DO NOT EXPOSE TO MOISTURE OR WATER

designed, made & tested in the UK

t l

off

100-240V~

50-60Hz 80W

thru

Advanced Transmission Line

These connections serve no function in a domestic/

consumer system. These would only be utilised in a

specialist professional recording studio environment

– Do not use.

THIS UNIT MUST BE EARTHED

Page 15

Positioning and alignment

Tip

With their unique TMcabinet design, ultra-low distortion, and smooth bass roll-off, PMC loudspeakers are

more forgiving of difcult room conditions and placement constraints than conventional designs. However,

we encourage you to spend some time experimenting in your own room to achieve the very best results,

remembering that small changes in location can often inuence system performance signicantly. The

following guidelines are suggestions for a starting point to locate your new subwoofer and optimise its

alignment. Fine-tuning can start from there.

Positioning

Since the twenty5 active subwoofer only reproduces frequencies below 150Hz, it doesn’t contribute

information towards stereo imaging, and can therefore be placed independently of the main satellite

stereo loudspeakers. However, the ideal positioning will be affected by the nature of the room’s standing

waves.

A simple way of nding the optimal location for the subwoofer is to place it initially at the listening position.

Play music or test signals with wide ranging bass notes and move around the potential subwoofer locations

listening for the position which gives the most uniform sound with minimal boomy or weak notes. The

subwoofer can then be relocated to the most uniform position. Ideally, this will be close to the front wall

and somewhere between the two front speakers.

Alignment/tuning

Once the optimal location has been decided, the subwoofer’s electrical tuning can be performed. The

rst parameter to adjust is the low-pass lter frequency and roll-off. These should complement the satellite

speaker’s low-frequency roll-off.

Next, the Phase can be aligned to ensure that the subwoofer signal through the crossover region arrives at

the listening position in-phase with the satellite speakers. A test signal (sine wave tone) can be used at a

frequency which will be reproduced by both the satellite speakers and subwoofer – typically around 85Hz.

The phase control (and if necessary the polarity inversion) should be adjusted to make the tone as loud as

possible, indicating proper alignment.

Finally, the level of the subwoofer can be adjusted to provide a smooth and balanced extension to the

low-frequency performance of the satellite speakers. When set correctly you will be almost unaware of

the subwoofer’s contribution, noticing its absence when switched off. If you are aware of it in normal use it

is probably turned up too loud!

Page 16

Operational controls

Tip

The twenty5 active subwoofer is congured and controlled via a simple menu system which is viewed on the

rear panel display and navigated by four associated push-buttons.

Looking at the four cursor buttons, the left and right buttons step back (exit) and select (enter) the menu

options, respectively, while the upper and lower buttons scroll through the various menu options and adjust

the parameter values. The menu structure is simple, logical and intuitive, and uses clear display legends to

indicate the selected function and parameter.

When the twenty5 active subwoofer is connected to a mains supply it will power-up with the default display.

Pressing any of the four rear panel buttons will turn the system on. The factory default settings will initially

congure the subwoofer to use the analogue XLR inputs, with the input sensitivity set to +12.5dB, Trim 0dB,

all the equalisation set at, backlight timeout 2 minutes, and the volume set to -20.5dB.

Factory Reset

The factory default settings can quickly be restored by pressing and holding the Up and Down buttons

simultaneously for more than 2 seconds.

Default Display

With the subwoofer switched on, the LCD window normally indicates the current volume level and the

selected low-pass lter frequency and slope. The system volume is indicated in decibels on the upper line of

the display, within the range -48.5 to +15dB. To increase or decrease the current volume level press the up/

down buttons. The LF roll-off settings are displayed on the second line, with the roll off frequency followed

by the slope.

V o l u m e – 2 0 . 5 d B

L F R o l l O f f

Power Mode

By pressing the right (enter) button, the next menu level is accessed which accesses the power standby

mode. By pressing the right button again, power standby is selected and the LCD will show ‘Zzz’ to indicate

the standby (Sleep) condition. The backlight will switch off.

Z z z

NOTE: The subwoofer can be activated again by pressing any rear panel button.

Page 17

Setup Mode

Tip

Pressing the right (enter) button twice from the default volume display accesses the Setup menu, and the

up/down buttons can then be used to access the various options.

S e t u p

+ 1 0 d B G a i n

After selecting the desired option pressing the right button again displays the current parameter value,

and the up/down buttons can be used to alter the value. Pressing the left (exit) button exits the parameter

level and allows other options to be selected.

+ 1 0 d B G a i n

O f f

Set Up Menu Options:

+10dB Gain Introduces +10dB gain to suit Dolby Digital LFE requirements

Phase Rev Polarity inversion, Off or On

Phase Phase alignment from 0 to 180 degrees in 5 degree increments

Paramtric EQ Switches single parametric EQ band Off or On

PEQ Gain Adjusts parametric EQ gain (-8.00dB to +7.87dB)

PEQ Frequency Adjusts parametric EQ centre frequency (20Hz to 150Hz)

PEQ Q Adjusts parametric EQ bandwidth (Q=1 to 8)

BL Timeout Sets the time after which the LCD backlight will switch off.

Options: 30 sec, 2 min, 5 min, off (no timeout)

Trim Input trim level (-8.00dB to +7.87dB)

Analogue In Sens Input sensitivity (+4dB to +20dB)

Source Selects input source

(Analogue XLR, AES3 Left Channel, AES3 Right Channel, AES3 L+R)

LR Out Level Fixed or variable

LR Out Response Filtered or Full Range

LF Rolloff Slope Off, or 18, 12 or 6dB/Octave

LF Rolloff Freq Selects the low-pass roll-off turnover frequency

Frequency options: 50, 80

120, 150, or 200Hz

Page 18

5 Min

30 sec

Off (no timeout)

AES3 Chan L+R

AES3 Chan Left

AES3 Chan Right

6dB/Oct

18dB/Oct

12dB/Oct

200Hz

150Hz

– +10dB Gain – Off / On Off

Setup

Phase – 0 – 180 degrees 0

Phase Reverse – Off / On Off

PEQ Q – 1 – 8 1

PEQ Freq – 20Hz – 150Hz 20Hz

PEQ Gain – -8.00dB to +7.87dB 0

Parametric EQ – Off / On Off

BL Timeout – 2 min 2 min

Trim – -8.00dB to +7.87dB 0

Source – Analogue Analogue

Analogue In Sens – +4dB – +20dB +12.5dB

LR Out Level – Fixed / Variable Fixed

LR Out Response – Filtered / Full Range Filtered

LF Roll-off Slope – Off Off

LF Roll-Off Freq – 50Hz 50Hz

PMC sub 120Hz

Power Off – Zzz 80Hz

Pressing volume up and volume down together >2 sec whilst in default menu returns menus to factory defaults

First power-up from the mains switch boots speaker and default display

Volume +xx.xdB -48.5 to +15dB – -20.5dB

Default Display Up/Down Press Right Up/Down Press Right Display Up/Down Press Right Up/Down Default

LF Roll off Hz / xx * PMC sub Off

* 2nd line of display shows LPF roll-off frequency and slope in dB/octave All menus return to default after 60 seconds of button inactivity

Page 19

User EQ options

Tip

Integration with satellite speakers

PMC’s twenty5 active subwoofer features DSP-based user-equalisation options. These comprise an

adjustable low-pass lter to determine the frequency range over which the subwoofer operates,

with an adjustable slope which allows perfect integration with the low-frequency response of the

satellite speakers.

The low-pass lter can be switched off, or congured with a slope of 6, 12, or 18dB per octave, and

with turnover frequencies of 50, 80,120,150, or 200Hz, as illustrated in this diagram.

200 Hz150 Hz120 Hz80H z50H z

Off

18dB/Oct

12dB/Oct

6dB/Oct

When using the twenty5 active subwoofer with any other model from the twenty5 series range,

we recommend starting with a low-pass lter setting of 80Hz. However, you may adjust this setting

as room conditions and personal preferences dictate (see pages 20 & 21 for initial set ups with

twenty5 series products).

Page 20

Integration - Initial setup settings

Tip

Surround processor/receiver setup

Use processor controls to integrate the sub with your system

Partnering twenty5 model Processor speaker setting LF roll-off slope

twenty5.21

twenty5.22

twenty5.23

twenty5.24

twenty5.26

twenty5.C

Small, 80hz Off

Large Off

Small, 80hz Off

Back panel

www.pmc-speakers.com

Processor

.1/LFE

NO USER SERVICEABLE PARTS INSIDE

SERVICING BY AUTHORIZED PERSONNEL ONLY

CAUTION - RISK OF ELECTRIC SHOCK - DO NOT OPEN

PRECAUTION - RISQUE DE CHOC ELECTRIQUE - NAS PAS OUVRIR

WARNING - THIS ITEM IS CAPABLE OF PRODUCING HIGH SOUND PRESSURE

LEVELS WHICH COULD CAUSE PERMANENT HEARING DAMAGE

DO NOT USE WITHOUT AN EARTHED MAINS CONNECTION

DO NOT EXPOSE TO MOISTURE OR WATER

designed, made & tested in the UK

Sub output.1/LFE output

off

Advanced Transmission Line

Page 21

Processor

off

NO USER SERVICEABLE PARTS INSIDE

SERVICING BY AUTHORIZED PERSONNEL ONLY

CAUTION - RISK OF ELECTRIC SHOCK - DO NOT OPEN

PRECAUTION - RISQUE DE CHOC ELECTRIQUE - NAS PAS OUVRIR

WARNING - THIS ITEM IS CAPABLE OF PRODUCING HIGH SOUND PRESSURE

LEVELS WHICH COULD CAUSE PERMANENT HEARING DAMAGE

DO NOT USE WITHOUT AN EARTHED MAINS CONNECTION

DO NOT EXPOSE TO MOISTURE OR WATER

designed, made & tested in the UK

e o

Advanced Transmission Line

.1/LFE

Sub output.1/LFE output

Integration - Initial setup settings (continued)

2.1 setup with stereo speakers

Partnering twenty5 model LF roll-off frequency LF roll-off slope Left & right output response

twenty5.21

twenty5.22

twenty5.23

twenty5.24

twenty5.26

80hz 12dB/Oct Filtered

80hz 6dB/Oct Filtered

80hz 6dB/Oct Full Range

50hz 6dB/Oct Full Range

Back panel

www.pmc-speakers.com

Pre amp/integrated

with pre outputs

NO USER SERVICEABLE PARTS INSIDE

SERVICING BY AUTHORIZED PERSONNEL ONLY

CAUTION - RISK OF ELECTRIC SHOCK - DO NOT OPEN

PRECAUTION - RISQUE DE CHOC ELECTRIQUE - NAS PAS OUVRIR

WARNING - THIS ITEM IS CAPABLE OF PRODUCING HIGH SOUND PRESSURE

LEVELS WHICH COULD CAUSE PERMANENT HEARING DAMAGE

DO NOT USE WITHOUT AN EARTHED MAINS CONNECTION

DO NOT EXPOSE TO MOISTURE OR WATER

designed, made & tested in the UK

LF filtered

off

Advanced Transmission Line

Power amp

LF filteredSub outputFull range

Page 22

Advanced room integration using the on board parametric EQ

A single-band parametric equaliser can be used to compensate for single resonances or dips in

the room response, assisting with in-room alignment.

The centre frequency of the single-band parametric equaliser (PEQ) is adjustable between 20Hz and

150Hz (in 5Hz increments). The bandwidth is variable between Q=1 to 8 in 0.5 steps (equaivalent to

bandwidths of 1.4 to 0.2 octaves). The PEQ gain can be adjusted between a boost of up to +7.87

and a cut of up to -8dB.

+8dB

PEQ Gain

0dB

-8dB

20Hz 150Hz

PEQ Frequency

A separate high-pass lter option is included for bass-managment of the output signals which may

be passed on to satellite loudspeakers. The high-pass lter turnover frequency and slope mirrors the

selected low-pass lter settings.

Q=1

Q=8

Example response curves to compensate for room peaks or dips in bass response

An example of a 7.87dB boost at 65Hz with a Q of 1 - wide bandwidth boost at 65Hz

+7.87dB MAX

PEQ Gain

0dB

-8dB MIN

20Hz 150Hz

65Hz

PEQ Frequency

Q=1

Page 23

An example of a 7.87dB boost at 65Hz with a Q of 8 (a narrow bandwidth boost at 65Hz)

Tip

+7.87dB MAX

PEQ Gain

0dB

-8dB MIN

20Hz 150Hz

PEQ Frequency

Q=8

65Hz

An example of a -8dB cut at 65Hz with a Q of 1 (a wide bandwidth cut at 65Hz)

+7.87dB MAX

PEQ Gain

0dB

Q=1

-8dB MIN

20Hz 150Hz

65Hz

PEQ Frequency

An example of a -8dB cut at 65Hz with a Q of 8 (a narrow bandwidth cut at 65Hz)

+7.87dB MAX

PEQ Gain

0dB

Q=8

-8dB MIN

20Hz 150Hz

65Hz

PEQ Frequency

Page 24

50+ hours to run-in

Running in

Tip

When loudspeakers are new they will take time to reach their full potential.

The characteristics of mechanical devices such as loudspeakers alter and

improve their performance signicantly after a ‘running in’ period.

The science is simple; as the soft material surrounding the woofer cones is exed

it will eventually reach a point where it has optimum compliancy allowing the

drive units to move more freely. This translates to greater accuracy, detail and

speed of attack. This short ‘running in’ period takes approximately 50 hours of

normal use.

Page 25

Specications

Tip

Input Connectors Two balanced analogue (left/right) via XLR (female)

One AES3 digital (left/right or summed channel selectable) via XLR (female)

Input sample rate: 32 -192kHz, 24-bit via internal sample rate converter

All XLR-3F connectors wired Pin-1 screen, Pin-2 hot, Pin-3 cold

Each input has independent ±8dB trim range

Outputs Two balanced analogue (left/right) via XLR (male)

One AES3 digital via XLR(male)

Outputs can carry direct or high-pass ltered audio, at xed or variable level.

All outputs are simultaneously available regardless of selected source.

LCD 16x2 LCD display and four navigation buttons allow system conguration

LCD Backlight Timeout 30 seconds, 2 minutes, 5 minutes, or Off

System Volume -48.5dB to +15dB

Gain Trim -8.00dB to +7.87dB

Analogue Input Sensitivity +4dB to +20dB (default = +12.5dB)

LFE +10dB Gain Mode Off/On

Source Selection Analogue, AES3 Left Channel, AES3 Right Channel, AES3 Left+Right

(Subwoofer signal is sum of left and right inputs)

Subwoofer LPF Roll-off Slope Low-pass lter: Off, 6dB/Oct, 12dB/Oct, or 18dB/Oct

Subwoofer Roll-off Frequency 50Hz, 80Hz, 120Hz, 150Hz, or 200Hz

Polarity Invert Off/On

Phase Alignment 0 to 180 degrees (in 5 degree increments)

Parametric EQ (PEQ) Off/On

PEQ Gain -8.00dB to +7.87dB

* Specications subject to change

Page 26

PEQ Frequency 20Hz to 150Hz (in 5Hz increments)

Tip

PEQ Bandwidth Q adjustable between 1 and 8 in steps of 0.5

Left/Right Output Levels Fixed/Variable

Left/Right Output Response High-pass Filtered/Fullrange

Amplier Section 400W / 4 Ohms (driving two 8 Ohm bass drivers)

Mains Power IEC connector. 90-132 / 180-264V AC 50 / 60Hz Auto-sensing

Usable Frequency Response 22Hz to 200Hz

Effective

Length 3m (9.8ft)

Drive units

2 x PMC twenty5 series 6.5”/170mm long-throw g-weave™ cone

with cast alloy chassis

Cabinet dimensions H 587mm (+20mm spikes) W 200mm (274mm inc plinths) D 516mm (+9mm grille)

Finish Diamond Black

Weight 25kg

Page 27

Service

Tip

We are condent your twenty5 subwoofer will afford many years of trouble-free

listening of the highest order. B ut in the unlikely event that it requires repair, our

unique manufacturing procedure, wherein the precise value of each component

together with the response of the system as a whole is recorded, will ensure

that any replaced parts will exactly match the performance of those originally

included within the subwoofer.

For any issues that might arise or for advice and service requirements, the primary

point of contact should be your knowledgeable and authorised PMC dealer/

distributor.

If you do not have a local representative please see www.pmc-speakers.com

and click on ‘where to buy’.

Alternatively you can view our FAQ’s (Frequently Asked Questions) and servicing

section on our website.

Important Note: Please do not return any products to PMC directly

without rst contacting our service department.

Page 28

The twenty5 series

Tip

The twenty5 series currently spans 7 different models, from the 3-way oorstanding twenty5.26

down to the diminutive standmounting twenty5.21. However, every monitor is designed with the

same care and attention, using shared families of drive units and crossover designs. As a direct

consequence they all enjoy the same family characteristics of wide dispersion, low distortion,

consistent voicing, and an even bass response regardless of listening level. This feature allows

different sizes of speakers to be used in concert to create effective multichannel systems.

Page 29

Tip

Our meticulous attention to detail

All PMC loudspeakers are hand-built in the U.K. using individual components

that are matched to our reference model; this includes the structural integrity

of every cabinet and the testing and recording of each component. This

guarantees it will be within our strict tolerances and ensures your purchase

sounds identical to the original design. Each completed loudspeaker then

undergoes a set of objective and subjective measurements - frequency response

sweeps ensure that the design meets our exacting performance criteria, and

then listening tests are conducted against the reference model using a wide

variety of material, from a benchmark BBC speech test to classical music,

pop and rock.

“Computers don’t tell the full story. As well as a full frequency analysis, we listen to each speaker we make and run a benchmark BBC speech and music test on every single one.”

Page 30

Tip

Inspection checklist

Every component that appears in a PMC product is measured, tested, matched

and recorded by hand. This analysis also applies to the nal product we build to ensure

you receive an identical replica of the reference model.

Enclosure nish

Assembly & Wiring

Driver Installation

Enclosure seal

Level - Frequency

Impedance - frequency

Listening test 1

Listening test 2

Final inspection

Accessory pack

User Guide

The builder’s signature on the front of this user guide signies that all the above tests

have been successfully completed.

Page 31

Warranty on-line

SIMPLY ACTIVATE YOUR 5 YEAR

WARRANTY ON-LINE

GO TO WWW.PMC-SPEAKERS.COM AND CLICK ON REGISTER PRODUCT

WARRANTY ON-LINE

If you do not have access to the internet ll in the

warranty form found on pages 33 & 34 and post it to us.

Page 32

WARRANTY CERTIFICATE - PART 1

Your copy

to keep

Please complete and retain this page for your own records

Product

Serial nos

Date of purchase

Dealers name

Dealers address

Town

County

Postcode

Dealers telephone no

Servicing and warranty issues – Please read the following carefully.

Non UK clients: Contact your local dealer/distributor for the details of warranty repairs - see www.pmc-speakers.com and click on ‘where

to buy’ for their details.

UK clients: In the unlikely event of a fault occurring with your The Professional Monitor Company Limited (PMC) product rstly contact your

dealer where the product was purchased.

Do not return a product to PMC without rstly contacting our technical dept. If the product must be returned for service you will be issued

with a ‘Returns Authorisation Number’.

If a product is returned to PMC and subsequently is found to have no fault or a non-warranty fault it will be subject to a minimum of £50.00

plus the carriage for its return.

Proof of purchase is required for any claim covered by this warranty.

This product is warranted for a period of 20 years from the date of purchase or upon receipt of ‘our copy’ overleaf or on-line registration

within ten days of purchase or receipt.

The warranty covers defects due to faulty materials or workmanship but does not cover defects arising from accidental damage,

misuse or wear and tear. The warranty is void if any attempt has been made by persons not authorised by PMC to dismantle,

repair or modify any part of the product.

Products must be returned using original packing material. This warranty does not cover damage in transit.

Note that the cost of the carriage to PMC is not covered by the warranty.

Returned products that are defective that are covered by warranty will be repaired or replaced at the discretion of PMC.

Allow minimum of 14 working days for return of warranty repairs.

This warranty does not effect your consumer rights under statutory law. This warranty is only valid in the United Kingdom.

Page 33

Tip

WARRANTY CERTIFICATE - PART 2

Our copy

Please complete and return this section - or simply complete the on-line

registration at www.pmc-speakers.com and click on register product.

Product

Serial Nos

Date of purchase

Purchased from

Your Name

Your email address

Your address

Town

County

Postcode/Zip code

Help us improve

our products

see over

Page 34

Help us Improve Your comments

Tip

If there is one thing we should change, what would it be?

We value all our client’s comments. Please take a moment to help us improve:

Please tell us how your new PMC’s perform. Your comments may appear on

the customer quotes section for this product on our site. N.B. Don’t worry the

comments will be anonymous; your personal details will not appear.

What magazines do you read?

HiFi Pro Lifes style Online

HiFi Choice Future Music T3 mixonline.com

What HiFi Sound on Sound Stuff gearslutz.com

Stereophile Audio Media GQ avreview.co.uk

HiFi World Pro Sound News EVO techradar.com

HiFi Critic Resolution FHM HiFi WigWam.com

HiFi News Audiofanzine Shortlist What HiFi.com

HiFi+ IBE Maxim

Gramophone Tape Op Esquire Other

Other Other Other

the-ear.net

We hope you enjoy your latest purchase as much as we enjoyed designing

and building them - Thank you.

Page 35

Notes

This document should not be construed as a commitment on the part of The Professional Monitor Company Limited

(PMC). The information it contains is subject to change without notice. PMC assumes no responsibility for errors that

may appear within this document. Information subject to change.

ATL , twenty5, g-weave, and Laminair are trade marks of The Professional Monitor Company Limited.

CE Conformity PMC passive loudspeakers conform to CE Directive LVD 73/23/EEC and EMC 89/336/EEC.

WEEE European directive - PMC is a member of a National Compliance scheme and have gained the associated

certication of compliance and the following registration number from the Environment Agency WEEE/GJ0101WU

WEEE EU Directive

This symbol on the product or in/on its packaging indicates that this product must not be disposed of with other

household waste. It is the responsibility of the owner to dispose of waste equipment via a designated collection

point for the recycling of waste electrical and electronic equipment. The recycling of your waste equipment is an

attempt to conserve natural resources and ensures that it is recycled in a manner that protects human health and

the environment. For more information about where you dispose of your waste equipment for recycling, please

contact your local waste/recycling authority or the dealer from whom you purchased the product.

Page 36

T + 44 (0) 1767 686300

sales@pmc-speakers.com

www.pmc-speakers.com

PMC Stock Code: 15089

Ref No. 782 - Nov 16