Soundcraft Spirit Absolute 4P Manual

Soundcraft Ikke kategoriseret Spirit Absolute 4P

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Side 1/1

M A I N F E A T U R E S

High deﬁnition linear

phase design

Flat on- and o-axis

frequency response

Custom designed

magnetically

compensated drivers

Long throw Aerogel™

170mm LF driver

25mm ferroﬂuid-cooled

soft dome tweeter

Vented cabinet with large

ﬂared port, for extended

low frequency response,

even at high levels

Integral low distortion

100W (LF) and 100W (HF)

power ampliﬁers, with

full protection/limiting

for both drivers and

ampliﬁers

Constant voltage active

crossover, with time

compensation for driver

alignment

Stepped input level

control for accurate setup

Switched 40Hz HPF

allowing higher sound

levels from bass-heavy

music signals

XLR connector for

balanced signals, RCA

phono-type sockets for

unbalanced signals

Spirit by Soundcraft™, Harman International Industries Ltd.,

Cranborne House, Cranborne Industrial Estate, Cranborne

Road, Potters Bar, Hertfordshire EN6 3JN, England.

Tel: + +44 (0)1707 665000. Fax: 44 (0)1707 665461

Spirit by Soundcraft™, 11820 Kemper Road, Auburn,

CA. 95603, USA. Tel: (916) 888 0488. Fax: (916) 888 0480

http://www.spirit-by-soundcraft.co.uk

Part # ZL0417

ABSOLUTE PHASE LINEARITY

A true phase linear design prevents

phase lag to ensure that all frequencies

reach your ear at the same time,

essential for accurate monitoring.

Many designs attempt to overcome the

problem by playing with the physical

alignment of the drivers, invariably

leading to phase lag at low frequencies.

In contrast, Absolute 4Ps achieve true

phase linearity by the use of Spirit’s

active VCS crossover which

electronically ‘aligns’ the drivers.

ABSOLUTE SOUND QUALITY

To achieve Trevor Stride’s design brief

of a natural, uncoloured sound, 4Ps use

bass cones custom-made from HD-A

( ). ThisHigh Deﬁnition Aerogel™

remarkable new composite exhibits

very high internal damping, high

rigidity and low mass. Being lighter

and more rigid than standard paper

designs, 4P’s cones are at least 2dB

more efﬁcient and very low in

colouration. Furthermore, Trevor

chose ferro-ﬂuid cooled soft dome

drivers instead of metallic tweeters

which can create unwanted spurious

HF resonances. Flat response is

maintained o-axis by the newly

designed tweeter face plates, and

the edges of the substantial 18mm

MDF cabinet are radiused to help

prevent HF refraction and

interference.

ABSOLUTE POWER

Two 100 watt ampliﬁers in each

enclosure make Absolute 4Ps the

most powerful active monitors

in their price class - but that wasn’t

the prime objective. The use of an

active VCS crossover, coupled with

dedicated drive to the LF and HF

units, enables the frequency

response characteristics of the

system to remain ﬂat at all

levels. Built-in protection

circuitry also works together

with the ampliﬁers to provide a

constant safeguard. A switchable

40Hz High Pass Filter allows

accurate, high level monitoring of

bass-heavy music signals as well as

simulating the response

of typical ‘hiﬁ’ speakers

to facilitate home

studio mixing.

Ampliﬁer Power Output: HF – 100 Watts RMS

LF – 100 Watts RMS

Frequency response (half space on axis): 40Hz - 22kHz, -3dB

Crossover (constant voltage, linear phase): 2.4kHz

Efﬁciency (half space): 115dB max SPL @ 1m

Driver complement: 170mm LF/25mm HF

Dimensions (HxWxD): 395 x 240 x 330mm

15.5 x 9.5 x 13”

Weight: 13.8kg (30.5lbs) each

E&OE. Spirit by Soundcraft ™ reserves the right to alter designs or speciﬁcations

without prior notice. 7.3.97

S P E C I F I C A T I O N S

T H E I N S I D E S T O R Y

ABSOLUTE COMPATIBILITY

4Ps cater for both professional and

semi-pro connections, and can be used

with a wide range of input sources

such as mixers, CD Players, and DAT

machines. Industry standard XLR

connectors handle balanced signals

(+4dBu) while gold-plated phonos

take care of unbalanced sources

(-10dBV). Further accurate left/right

channel matching is assured by the

stepped input level controls.

ABSOLUTE PROTECTION

4Ps are protected by a ‘zero-

colouration’ active circuit, that has

no adverse eect on sound quality, and

which continuously monitors operating

status by simulating drive unit power

dissipation. Any signal approaching

danger level will be progressively limited

by ,precision electronic attenuators

without aecting transients. A red LED

on the front panel illuminates when the

protection circuit is limiting, giving you

plenty of time to re-adjust your levels.

If the yellow LED lights, the amps are

running too hot and it’s

time to reduce

levels.

Input Waveform

Non Phase Linear System

(low frequencies lag behind)

Absolute 4P

Phase Linear System

100 Watt HF Amp

Tweeter

Woofer

100 Watt LF Amp

Active Phase Linear

VCS Crossover

100

10 50 100 1k 5k500 10k 20k Hz

pirit Absolute 4P active monitors put

you in command of the mix by taking

away the uncertainties of sound

reproduction. Whilst some passive

speakers can prove unpredictable due to

external factors over which they have no

control, 4P’s active design optimises the

performance of built-in amps, drive

units, and electronic crossovers to

ensure that they work together as a

cohesive whole.

The DESIGN CONCEPT

Absolute 4P has been designed by Trevor

Stride, the man behind the acclaimed Absolute

2 and Absolute Zero monitors.

Trevor has over 15 years of audio design

experience behind him, working for a number

of the industry’s leading names. Trevor’s

design philosophy is deceptively simple:

• Any professional monitor should exhibit an

even frequency response at high and low

levels, on and o axis;

• It should have the most accurate possible

time domain response;

• It should have the most natural, uncoloured

sound possible, whatever the price level;

• It should not exaggerate or enhance sound

to satisfy individual tastes;

• It should not cause listening fatigue which

often arises from the inappropriate use of

driver materials;

• It should be reliable in prolonged,

professional use.

To satisfy these criteria, Trevor has scrutinised every element of 4P’s

design to optimise its performance.

Four built-in ampliﬁers (2 in each cabinet) are high-calibre,

professional devices, which have been ‘custom tuned’ to perfectly

match the drive units. The have beenactive VCS crossovers

designed to prevent distortion of the system phase response

(a common characteristic of systems which rely solely on physical

driver alignment) by electronically aligning the drivers. Close

proximity between the electronics and the drivers has a beneﬁt -

the short cable runs minimise signal loss, which means greater

efﬁciency and better dynamics custom. Both drive units are

designed magnetically compensatedand . The 6.5 inch (170mm)

bass driver has a , phase plug andlow-resonance cast chassis

cone made from . The result is an LFHigh Deﬁnition Aerogel™

unit which, when compared to a paper cone of the same weight,

has a remarkably high stiffness-to-weight ratio very goodand

damping - two highly desirable yet normally elusive qualities.

Thanks to the versatility of the active system, HF response is

extremely ﬂat superb dispersionwith ; the 30° off axis response

extends to 17kHz. Because of the wide dispersion angle of the

tweeter, the cabinet design has large radii on all edges to

minimise edge diffraction effects. For absolute ﬂexibility, the 4Ps

may be used in a vertical or horizontal position, the latter being

accomplished by simply rotating the internal ampliﬁers through 90°.

Absolute 4P

PROFESSIONAL ACTIVE MONITOR SYSTEM

A P P L I C A T I O N S

Nearﬁeld monitoring in large studios

Small studio monitoring

Home studio monitoring

Video edit/post-production suites

Multimedia

High quality small venue sound

reinforcement/distribution

Absolute 4Ps at

Strongroom Two,

London

Produkt Specifikationer

Mærke:	Soundcraft
Kategori:	Ikke kategoriseret
Model:	Spirit Absolute 4P

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